diff --git a/1_wire/Makefile b/1_wire/Makefile
new file mode 100644
index 0000000..ffe6748
--- /dev/null
+++ b/1_wire/Makefile
@@ -0,0 +1,133 @@
+BINARY		= onewire
+BOOTPORT	?= /dev/ttyUSB0
+BOOTSPEED	?= 115200
+# change this linking script depending on particular MCU model,
+# for example, if you have STM32F103VBT6, you should write:
+LDSCRIPT	= ld/stm32f103xB.ld
+LIBNAME		= opencm3_stm32f1
+DEFS		= -DSTM32F1 -DEBUG
+
+OBJDIR = mk
+INDEPENDENT_HEADERS=
+
+FP_FLAGS	?= -msoft-float
+ARCH_FLAGS	= -mthumb -mcpu=cortex-m3 $(FP_FLAGS) -mfix-cortex-m3-ldrd
+
+###############################################################################
+# Executables
+PREFIX		?= arm-none-eabi
+
+RM			:= rm -f
+RMDIR		:= rmdir
+CC			:= $(PREFIX)-gcc
+LD			:= $(PREFIX)-gcc
+AR			:= $(PREFIX)-ar
+AS			:= $(PREFIX)-as
+OBJCOPY		:= $(PREFIX)-objcopy
+OBJDUMP		:= $(PREFIX)-objdump
+GDB			:= $(PREFIX)-gdb
+STFLASH		= $(shell which st-flash)
+STBOOT		= $(shell which stm32flash)
+
+###############################################################################
+# Source files
+LDSCRIPT	?= $(BINARY).ld
+SRC			= $(wildcard *.c)
+OBJS		= $(addprefix $(OBJDIR)/, $(SRC:%.c=%.o))
+
+ifeq ($(strip $(OPENCM3_DIR)),)
+OPENCM3_DIR := /usr/local/arm-none-eabi
+$(info Using $(OPENCM3_DIR) path to library)
+endif
+
+INCLUDE_DIR	= $(OPENCM3_DIR)/include
+LIB_DIR		= $(OPENCM3_DIR)/lib
+SCRIPT_DIR	= $(OPENCM3_DIR)/scripts
+
+###############################################################################
+# C flags
+CFLAGS		+= -Os -g
+CFLAGS		+= -Wall -Wextra -Wshadow -Wimplicit-function-declaration
+CFLAGS		+= -Wredundant-decls
+# -Wmissing-prototypes -Wstrict-prototypes
+CFLAGS		+= -fno-common -ffunction-sections -fdata-sections
+
+###############################################################################
+# C & C++ preprocessor common flags
+CPPFLAGS	+= -MD
+CPPFLAGS	+= -Wall -Werror
+CPPFLAGS	+= -I$(INCLUDE_DIR) $(DEFS)
+
+###############################################################################
+# Linker flags
+LDFLAGS		+= --static -nostartfiles
+LDFLAGS		+= -L$(LIB_DIR)
+LDFLAGS		+= -T$(LDSCRIPT)
+LDFLAGS		+= -Wl,-Map=$(*).map
+LDFLAGS		+= -Wl,--gc-sections
+
+###############################################################################
+# Used libraries
+LDLIBS		+= -l$(LIBNAME)
+LDLIBS		+= -Wl,--start-group -lc -lgcc -Wl,--end-group
+
+.SUFFIXES: .elf .bin .hex .srec .list .map .images
+.SECONDEXPANSION:
+.SECONDARY:
+
+ELF		:= $(OBJDIR)/$(BINARY).elf
+LIST	:= $(OBJDIR)/$(BINARY).list
+BIN		:= $(BINARY).bin
+HEX		:= $(BINARY).hex
+
+all: bin
+
+elf: $(ELF)
+bin: $(BIN)
+hex: $(HEX)
+list: $(LIST)
+
+$(OBJDIR):
+	mkdir $(OBJDIR)
+
+$(OBJDIR)/%.o: %.c
+	@printf "  CC      $<\n"
+	$(CC) $(CFLAGS) $(CPPFLAGS) $(ARCH_FLAGS) -o $@ -c $<
+
+$(SRC) : %.c : %.h $(INDEPENDENT_HEADERS)
+	@touch $@
+
+%.h: ;
+
+$(BIN): $(ELF)
+	@printf "  OBJCOPY $(BIN)\n"
+	$(OBJCOPY) -Obinary $(ELF) $(BIN)
+
+$(HEX): $(ELF)
+	@printf "  OBJCOPY $(HEX)\n"
+	$(OBJCOPY) -Oihex $(ELF) $(HEX)
+
+$(LIST): $(ELF)
+	@printf "  OBJDUMP $(LIST)\n"
+	$(OBJDUMP) -S $(ELF) > $(LIST)
+
+$(ELF): $(OBJDIR) $(OBJS) $(LDSCRIPT) $(LIB_DIR)/lib$(LIBNAME).a
+	@printf "  LD      $(ELF)\n"
+	$(LD) $(LDFLAGS) $(ARCH_FLAGS) $(OBJS) $(LDLIBS) -o $(ELF)
+
+clean:
+	@printf "  CLEAN\n"
+	$(RM) $(OBJS) $(OBJDIR)/*.d $(ELF) $(HEX) $(LIST) $(OBJDIR)/*.map
+	$(RMDIR) $(OBJDIR)
+
+flash: $(BIN)
+	@printf "  FLASH  $(BIN)\n"
+	$(STFLASH) write $(BIN) 0x8000000
+
+boot: $(BIN)
+	@printf "  LOAD $(BIN) through bootloader\n"
+	$(STBOOT) -b$(BOOTSPEED) $(BOOTPORT) -w $(BIN)
+
+.PHONY: clean elf hex list flash boot
+
+#-include $(OBJS:.o=.d)
diff --git a/1_wire/README b/1_wire/README
new file mode 100644
index 0000000..8abf06f
--- /dev/null
+++ b/1_wire/README
@@ -0,0 +1,7 @@
+My approach to semi-hardware 1-wire realisation based on DMA+TIM2
+
+written for chinese devboard based on STM32F103RBT6
+
+Press H for help
+
+// Still some troubles left: for example, can't read ROM; also the code isn't fully done yet
diff --git a/1_wire/cdcacm.c b/1_wire/cdcacm.c
new file mode 100644
index 0000000..5f032ad
--- /dev/null
+++ b/1_wire/cdcacm.c
@@ -0,0 +1,314 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Gareth McMullin <gareth@blacksphere.co.nz>
+ * Copyright 2014 Edward V. Emelianov <eddy@sao.ru, edward.emelianoff@gmail.com>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "cdcacm.h"
+#include "user_proto.h"
+#include "main.h"
+
+// Buffer for USB Tx
+static uint8_t USB_Tx_Buffer[USB_TX_DATA_SIZE];
+static uint8_t USB_Tx_ptr = 0;
+// connection flag
+uint8_t USB_connected = 0;
+static const struct usb_device_descriptor dev = {
+	.bLength = USB_DT_DEVICE_SIZE,
+	.bDescriptorType = USB_DT_DEVICE,
+	.bcdUSB = 0x0200,
+	.bDeviceClass = USB_CLASS_CDC,
+	.bDeviceSubClass = 0,
+	.bDeviceProtocol = 0,
+	.bMaxPacketSize0 = 64,
+	.idVendor = 0x0483,
+	.idProduct = 0x5740,
+	.bcdDevice = 0x0200,
+	.iManufacturer = 1,
+	.iProduct = 2,
+	.iSerialNumber = 3,
+	.bNumConfigurations = 1,
+};
+
+char usbdatabuf[USB_RX_DATA_SIZE]; // buffer for received data
+int usbdatalen = 0;  // lenght of received data
+
+/*
+ * This notification endpoint isn't implemented. According to CDC spec its
+ * optional, but its absence causes a NULL pointer dereference in Linux
+ * cdc_acm driver.
+ */
+static const struct usb_endpoint_descriptor comm_endp[] = {{
+	.bLength = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType = USB_DT_ENDPOINT,
+	.bEndpointAddress = 0x83,
+	.bmAttributes = USB_ENDPOINT_ATTR_INTERRUPT,
+	.wMaxPacketSize = 16,
+	.bInterval = 255,
+}};
+
+static const struct usb_endpoint_descriptor data_endp[] = {{
+	.bLength = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType = USB_DT_ENDPOINT,
+	.bEndpointAddress = 0x01,
+	.bmAttributes = USB_ENDPOINT_ATTR_BULK,
+	.wMaxPacketSize = 64,
+	.bInterval = 1,
+}, {
+	.bLength = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType = USB_DT_ENDPOINT,
+	.bEndpointAddress = 0x82,
+	.bmAttributes = USB_ENDPOINT_ATTR_BULK,
+	.wMaxPacketSize = 64,
+	.bInterval = 1,
+}};
+
+static const struct {
+	struct usb_cdc_header_descriptor header;
+	struct usb_cdc_call_management_descriptor call_mgmt;
+	struct usb_cdc_acm_descriptor acm;
+	struct usb_cdc_union_descriptor cdc_union;
+} __attribute__((packed)) cdcacm_functional_descriptors = {
+	.header = {
+		.bFunctionLength = sizeof(struct usb_cdc_header_descriptor),
+		.bDescriptorType = CS_INTERFACE,
+		.bDescriptorSubtype = USB_CDC_TYPE_HEADER,
+		.bcdCDC = 0x0110,
+	},
+	.call_mgmt = {
+		.bFunctionLength =
+			sizeof(struct usb_cdc_call_management_descriptor),
+		.bDescriptorType = CS_INTERFACE,
+		.bDescriptorSubtype = USB_CDC_TYPE_CALL_MANAGEMENT,
+		.bmCapabilities = 0,
+		.bDataInterface = 1,
+	},
+	.acm = {
+		.bFunctionLength = sizeof(struct usb_cdc_acm_descriptor),
+		.bDescriptorType = CS_INTERFACE,
+		.bDescriptorSubtype = USB_CDC_TYPE_ACM,
+		.bmCapabilities = 0,
+	},
+	.cdc_union = {
+		.bFunctionLength = sizeof(struct usb_cdc_union_descriptor),
+		.bDescriptorType = CS_INTERFACE,
+		.bDescriptorSubtype = USB_CDC_TYPE_UNION,
+		.bControlInterface = 0,
+		.bSubordinateInterface0 = 1,
+	 },
+};
+
+static const struct usb_interface_descriptor comm_iface[] = {{
+	.bLength = USB_DT_INTERFACE_SIZE,
+	.bDescriptorType = USB_DT_INTERFACE,
+	.bInterfaceNumber = 0,
+	.bAlternateSetting = 0,
+	.bNumEndpoints = 1,
+	.bInterfaceClass = USB_CLASS_CDC,
+	.bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
+	.bInterfaceProtocol = USB_CDC_PROTOCOL_AT,
+	.iInterface = 0,
+
+	.endpoint = comm_endp,
+
+	.extra = &cdcacm_functional_descriptors,
+	.extralen = sizeof(cdcacm_functional_descriptors),
+}};
+
+static const struct usb_interface_descriptor data_iface[] = {{
+	.bLength = USB_DT_INTERFACE_SIZE,
+	.bDescriptorType = USB_DT_INTERFACE,
+	.bInterfaceNumber = 1,
+	.bAlternateSetting = 0,
+	.bNumEndpoints = 2,
+	.bInterfaceClass = USB_CLASS_DATA,
+	.bInterfaceSubClass = 0,
+	.bInterfaceProtocol = 0,
+	.iInterface = 0,
+
+	.endpoint = data_endp,
+}};
+
+static const struct usb_interface ifaces[] = {{
+	.num_altsetting = 1,
+	.altsetting = comm_iface,
+}, {
+	.num_altsetting = 1,
+	.altsetting = data_iface,
+}};
+
+static const struct usb_config_descriptor config = {
+	.bLength = USB_DT_CONFIGURATION_SIZE,
+	.bDescriptorType = USB_DT_CONFIGURATION,
+	.wTotalLength = 0,
+	.bNumInterfaces = 2,
+	.bConfigurationValue = 1,
+	.iConfiguration = 0,
+	.bmAttributes = 0x80,
+	.bMaxPower = 0x32,
+
+	.interface = ifaces,
+};
+
+static const char *usb_strings[] = {
+	"Organisation, author",
+	"device",
+	"version",
+};
+
+// default line coding: B115200, 1stop, 8bits, parity none
+struct usb_cdc_line_coding linecoding = {
+	.dwDTERate   = 115200,
+	.bCharFormat = USB_CDC_1_STOP_BITS,
+	.bParityType = USB_CDC_NO_PARITY,
+	.bDataBits   = 8,
+};
+
+/* Buffer to be used for control requests. */
+uint8_t usbd_control_buffer[128];
+
+/**
+ * This function runs every time it gets a request for control parameters get/set
+ * parameter SET_LINE_CODING used to change USART1 parameters: if you want to
+ * change them, just connect through USB with required parameters
+ */
+static int cdcacm_control_request(usbd_device *usbd_dev, struct usb_setup_data *req, uint8_t **buf,
+		uint16_t *len, void (**complete)(usbd_device *usbd_dev, struct usb_setup_data *req)){
+	(void)complete;
+	(void)buf;
+	(void)usbd_dev;
+	char local_buf[10];
+	struct usb_cdc_line_coding  lc;
+
+	switch (req->bRequest) {
+	case SET_CONTROL_LINE_STATE:{
+		if(req->wValue){ // terminal is opened
+			USB_connected = 1;
+		}else{ // terminal is closed
+			USB_connected = 0;
+		}
+		/*
+		 * This Linux cdc_acm driver requires this to be implemented
+		 * even though it's optional in the CDC spec, and we don't
+		 * advertise it in the ACM functional descriptor.
+		 */
+		struct usb_cdc_notification *notif = (void *)local_buf;
+		/* We echo signals back to host as notification. */
+		notif->bmRequestType = 0xA1;
+		notif->bNotification = USB_CDC_NOTIFY_SERIAL_STATE;
+		notif->wValue = 0;
+		notif->wIndex = 0;
+		notif->wLength = 2;
+		local_buf[8] = req->wValue & 3;
+		local_buf[9] = 0;
+		usbd_ep_write_packet(usbd_dev, 0x83, local_buf, 10);
+	}break;
+	case SET_LINE_CODING:
+		if (!len || (*len != sizeof(struct usb_cdc_line_coding)))
+			return 0;
+		memcpy((void *)&lc, (void *)*buf, *len);
+		// Mark & Space parity don't support by hardware, check it
+		if(lc.bParityType == USB_CDC_MARK_PARITY || lc.bParityType == USB_CDC_SPACE_PARITY){
+			return 0; // error
+		}else{
+//			memcpy((void *)&linecoding, (void *)&lc, sizeof(struct usb_cdc_line_coding));
+//			UART_setspeed(USART1, &linecoding);
+		}
+	break;
+	case GET_LINE_CODING: // return linecoding buffer
+		if(len && *len == sizeof(struct usb_cdc_line_coding))
+			memcpy((void *)*buf, (void *)&linecoding, sizeof(struct usb_cdc_line_coding));
+		//usbd_ep_write_packet(usbd_dev, 0x83, (char*)&linecoding, sizeof(linecoding));
+	break;
+	default:
+		return 0;
+	}
+	return 1;
+}
+
+static void cdcacm_data_rx_cb(usbd_device *usbd_dev, uint8_t ep){
+	(void)ep;
+	int len = usbd_ep_read_packet(usbd_dev, 0x01, usbdatabuf + usbdatalen, USB_RX_DATA_SIZE - usbdatalen);
+	usbdatalen += len;
+	if(usbdatalen >= USB_RX_DATA_SIZE){ // buffer overflow - drop all its contents
+		usbdatalen = 0;
+	}
+}
+
+static void cdcacm_data_tx_cb(usbd_device *usbd_dev, uint8_t ep){
+	(void)ep;
+	(void)usbd_dev;
+
+	usb_send_buffer();
+}
+
+static void cdcacm_set_config(usbd_device *usbd_dev, uint16_t wValue)
+{
+	(void)wValue;
+	(void)usbd_dev;
+
+	usbd_ep_setup(usbd_dev, 0x01, USB_ENDPOINT_ATTR_BULK, USB_RX_DATA_SIZE, cdcacm_data_rx_cb);
+	usbd_ep_setup(usbd_dev, 0x82, USB_ENDPOINT_ATTR_BULK, USB_TX_DATA_SIZE, cdcacm_data_tx_cb);
+	usbd_ep_setup(usbd_dev, 0x83, USB_ENDPOINT_ATTR_INTERRUPT, 16, NULL);
+
+	usbd_register_control_callback(
+				usbd_dev,
+				USB_REQ_TYPE_CLASS | USB_REQ_TYPE_INTERFACE,
+				USB_REQ_TYPE_TYPE | USB_REQ_TYPE_RECIPIENT,
+				cdcacm_control_request);
+}
+
+static usbd_device *current_usb = NULL;
+
+usbd_device *USB_init(){
+	current_usb = usbd_init(&stm32f103_usb_driver, &dev, &config,
+		usb_strings, 3, usbd_control_buffer, sizeof(usbd_control_buffer));
+	if(!current_usb) return NULL;
+	usbd_register_set_config_callback(current_usb, cdcacm_set_config);
+	return current_usb;
+}
+
+mutex_t send_block_mutex = MUTEX_UNLOCKED;
+/**
+ * Put byte into USB buffer to send
+ * @param byte - a byte to put into a buffer
+ */
+void usb_send(uint8_t byte){
+	mutex_lock(&send_block_mutex);
+	USB_Tx_Buffer[USB_Tx_ptr++] = byte;
+	mutex_unlock(&send_block_mutex);
+	if(USB_Tx_ptr == USB_TX_DATA_SIZE){ // buffer can be overflowed - send it!
+		usb_send_buffer();
+	}
+}
+
+/**
+ * Send all data in buffer over USB
+ * this function runs when buffer is full or on SysTick
+ */
+void usb_send_buffer(){
+	if(MUTEX_LOCKED == mutex_trylock(&send_block_mutex)) return;
+	if(USB_Tx_ptr){
+		if(current_usb && USB_connected){
+			// usbd_ep_write_packet return 0 if previous packet isn't transmit yet
+			while(USB_Tx_ptr != usbd_ep_write_packet(current_usb, 0x82, USB_Tx_Buffer, USB_Tx_ptr));
+			usbd_poll(current_usb);
+		}
+		USB_Tx_ptr = 0;
+	}
+	mutex_unlock(&send_block_mutex);
+}
diff --git a/1_wire/cdcacm.h b/1_wire/cdcacm.h
new file mode 100644
index 0000000..1051d83
--- /dev/null
+++ b/1_wire/cdcacm.h
@@ -0,0 +1,54 @@
+/*
+ * ccdcacm.h
+ *
+ * Copyright 2014 Edward V. Emelianov <eddy@sao.ru, edward.emelianoff@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#pragma once
+#ifndef __CCDCACM_H__
+#define __CCDCACM_H__
+
+#include <libopencm3/usb/usbd.h>
+
+// commands through EP0
+#define SEND_ENCAPSULATED_COMMAND   0x00
+#define GET_ENCAPSULATED_RESPONSE   0x01
+#define SET_COMM_FEATURE            0x02
+#define GET_COMM_FEATURE            0x03
+#define CLEAR_COMM_FEATURE          0x04
+#define SET_LINE_CODING             0x20
+#define GET_LINE_CODING             0x21
+#define SET_CONTROL_LINE_STATE      0x22
+#define SEND_BREAK                  0x23
+
+// Size of input/output buffers
+#define USB_TX_DATA_SIZE            64
+#define USB_RX_DATA_SIZE            64
+
+// USB connection flag
+extern uint8_t USB_connected;
+extern struct usb_cdc_line_coding linecoding;
+
+extern char usbdatabuf[];
+extern int usbdatalen;
+
+usbd_device *USB_init();
+void usb_send(uint8_t byte);
+void usb_send_buffer();
+
+#endif // __CCDCACM_H__
diff --git a/1_wire/hardware_ini.c b/1_wire/hardware_ini.c
new file mode 100644
index 0000000..8c80639
--- /dev/null
+++ b/1_wire/hardware_ini.c
@@ -0,0 +1,98 @@
+/*
+ * hardware_ini.c - functions for HW initialisation
+ *
+ * Copyright 2014 Edward V. Emelianov <eddy@sao.ru, edward.emelianoff@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+/*
+ * All hardware-dependent initialisation & definition should be placed here
+ * and in hardware_ini.h
+ *
+ */
+
+#include "main.h"
+#include "hardware_ini.h"
+
+/**
+ * GPIO initialisaion: clocking + pins setup
+ */
+void GPIO_init(){
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN |
+			RCC_APB2ENR_IOPBEN | RCC_APB2ENR_IOPCEN | RCC_APB2ENR_IOPDEN |
+			RCC_APB2ENR_IOPEEN);
+	// Buttons: pull-up input
+	gpio_set_mode(BTNS_PORT, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN,
+			BTN_S2_PIN | BTN_S3_PIN);
+	// turn on pull-up
+	gpio_set(BTNS_PORT, BTN_S2_PIN | BTN_S3_PIN);
+	// LEDS: opendrain output
+	gpio_set_mode(LEDS_PORT, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN,
+			LED_D1_PIN | LED_D2_PIN);
+	// turn off LEDs
+	gpio_set(LEDS_PORT, LED_D1_PIN | LED_D2_PIN);
+	// test pin PC10: Push-Pull
+#ifdef EBUG
+	gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO10);
+#endif
+/*
+	// USB_DISC: push-pull
+	gpio_set_mode(USB_DISC_PORT, GPIO_MODE_OUTPUT_2_MHZ,
+				GPIO_CNF_OUTPUT_PUSHPULL, USB_DISC_PIN);
+	// USB_POWER: open drain, externall pull down with R7 (22k)
+	gpio_set_mode(USB_POWER_PORT, GPIO_MODE_INPUT,
+				GPIO_CNF_INPUT_FLOAT, USB_POWER_PIN);
+*/
+}
+
+/*
+ * SysTick used for system timer with period of 1ms
+ */
+void SysTick_init(){
+	systick_set_clocksource(STK_CSR_CLKSOURCE_AHB_DIV8); // Systyck: 72/8=9MHz
+	systick_set_reload(8999); // 9000 pulses: 1kHz
+	systick_interrupt_enable();
+	systick_counter_enable();
+}
+
+// check buttons S2/S3
+void check_btns(){
+	static uint8_t oldstate[2] = {1,1}; // old buttons state
+	uint8_t newstate[2], i;
+	static uint32_t Old_timer[2] = {0,0};
+	newstate[0] = gpio_get(BTNS_PORT, BTN_S2_PIN) ? 1 : 0;
+	newstate[1] = gpio_get(BTNS_PORT, BTN_S3_PIN) ? 1 : 0;
+	for(i = 0; i < 2; i++){
+		uint8_t new = newstate[i];
+		// pause for 60ms
+		uint32_t O = Old_timer[i];
+		if(O){
+			if(Timer - O > 60 || O > Timer){
+				P("Button S");
+				usb_send('2' + i);
+				if(new) P("released");
+				else P("pressed");
+				newline();
+				oldstate[i] = new;
+				Old_timer[i] = 0;
+			}
+		}
+		else if(new != oldstate[i]){
+			Old_timer[i] = Timer;
+		}
+	}
+}
diff --git a/1_wire/hardware_ini.h b/1_wire/hardware_ini.h
new file mode 100644
index 0000000..ff0311f
--- /dev/null
+++ b/1_wire/hardware_ini.h
@@ -0,0 +1,76 @@
+/*
+ * hardware_ini.h
+ *
+ * Copyright 2014 Edward V. Emelianov <eddy@sao.ru, edward.emelianoff@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#pragma once
+#ifndef __HARDWARE_INI_H__
+#define __HARDWARE_INI_H__
+
+/*
+ * Timers:
+ * SysTick - system time
+ */
+
+
+void GPIO_init();
+void SysTick_init();
+
+/*
+ * Buttons on devboard
+ */
+#define BTNS_PORT		GPIOC
+// PCO -- S2
+#define BTN_S2_PIN		GPIO0
+// PC1 -- S3
+#define BTN_S3_PIN		GPIO1
+
+/*
+ * LEDS: PB9 for D1, PB8 for D2
+ */
+#define LEDS_PORT		GPIOB
+#define LED_D1_PIN		GPIO9
+#define LED_D2_PIN		GPIO8
+
+/*
+ * USB interface
+ * connect boot1 jumper to gnd, boot0 to gnd; and reconnect boot0 to +3.3 to boot flash
+ */
+/*
+// USB_DICS (disconnect) - PC11
+#define USB_DISC_PIN		GPIO11
+#define USB_DISC_PORT		GPIOC
+// USB_POWER (high level when USB connected to PC)
+#define USB_POWER_PIN		GPIO10
+#define USB_POWER_PORT		GPIOC
+// change signal level on USB diconnect pin
+#define usb_disc_high()   gpio_set(USB_DISC_PORT, USB_DISC_PIN)
+#define usb_disc_low()    gpio_clear(USB_DISC_PORT, USB_DISC_PIN)
+// in case of n-channel FET on 1.5k pull-up change on/off disconnect means low level
+// in case of pnp bipolar transistor or p-channel FET on 1.5k pull-up disconnect means high level
+#define usb_disconnect()  usb_disc_high()
+#define usb_connect()     usb_disc_low()
+*/
+// my simple devboard have no variants for programmed connection/disconnection of USB
+#define usb_disconnect()
+#define usb_connect()
+
+void check_btns();
+
+#endif // __HARDWARE_INI_H__
diff --git a/1_wire/ld/devices.data b/1_wire/ld/devices.data
new file mode 100644
index 0000000..7f29538
--- /dev/null
+++ b/1_wire/ld/devices.data
@@ -0,0 +1,9 @@
+stm32f103?4* stm32f1 ROM=16K RAM=6K
+stm32f103?6* stm32f1 ROM=32K RAM=10K
+stm32f103?8* stm32f1 ROM=64K RAM=20K
+stm32f103?b* stm32f1 ROM=128K RAM=20K
+stm32f103?c* stm32f1 ROM=256K RAM=48K
+stm32f103?d* stm32f1 ROM=384K RAM=64K
+stm32f103?e* stm32f1 ROM=512K RAM=64K
+stm32f103?f* stm32f1 ROM=768K RAM=96K
+stm32f103?g* stm32f1 ROM=1024K RAM=96K
diff --git a/1_wire/ld/stm32f103x4.ld b/1_wire/ld/stm32f103x4.ld
new file mode 100644
index 0000000..efed65e
--- /dev/null
+++ b/1_wire/ld/stm32f103x4.ld
@@ -0,0 +1,31 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2012 Karl Palsson <karlp@tweak.net.au>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Linker script for STM32F100x4, 16K flash, 4K RAM. */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH = 16K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 6K
+}
+
+/* Include the common ld script. */
+INCLUDE libopencm3_stm32f1.ld
+
diff --git a/1_wire/ld/stm32f103x6.ld b/1_wire/ld/stm32f103x6.ld
new file mode 100644
index 0000000..13f05f9
--- /dev/null
+++ b/1_wire/ld/stm32f103x6.ld
@@ -0,0 +1,31 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2012 Karl Palsson <karlp@tweak.net.au>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Linker script for STM32F100x4, 16K flash, 4K RAM. */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH =  32K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 10K
+}
+
+/* Include the common ld script. */
+INCLUDE libopencm3_stm32f1.ld
+
diff --git a/1_wire/ld/stm32f103x8.ld b/1_wire/ld/stm32f103x8.ld
new file mode 100644
index 0000000..2c4640f
--- /dev/null
+++ b/1_wire/ld/stm32f103x8.ld
@@ -0,0 +1,31 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2012 Karl Palsson <karlp@tweak.net.au>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Linker script for STM32F100x4, 16K flash, 4K RAM. */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH =  64K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K
+}
+
+/* Include the common ld script. */
+INCLUDE libopencm3_stm32f1.ld
+
diff --git a/1_wire/ld/stm32f103xB.ld b/1_wire/ld/stm32f103xB.ld
new file mode 100644
index 0000000..138444d
--- /dev/null
+++ b/1_wire/ld/stm32f103xB.ld
@@ -0,0 +1,31 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2012 Karl Palsson <karlp@tweak.net.au>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Linker script for STM32F100x4, 16K flash, 4K RAM. */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K
+}
+
+/* Include the common ld script. */
+INCLUDE libopencm3_stm32f1.ld
+
diff --git a/1_wire/ld/stm32f103xC.ld b/1_wire/ld/stm32f103xC.ld
new file mode 100644
index 0000000..fda76bf
--- /dev/null
+++ b/1_wire/ld/stm32f103xC.ld
@@ -0,0 +1,31 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2012 Karl Palsson <karlp@tweak.net.au>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Linker script for STM32F100x4, 16K flash, 4K RAM. */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH = 256K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 48K
+}
+
+/* Include the common ld script. */
+INCLUDE libopencm3_stm32f1.ld
+
diff --git a/1_wire/ld/stm32f103xD.ld b/1_wire/ld/stm32f103xD.ld
new file mode 100644
index 0000000..0f996c2
--- /dev/null
+++ b/1_wire/ld/stm32f103xD.ld
@@ -0,0 +1,31 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2012 Karl Palsson <karlp@tweak.net.au>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Linker script for STM32F100x4, 16K flash, 4K RAM. */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH = 384K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 64K
+}
+
+/* Include the common ld script. */
+INCLUDE libopencm3_stm32f1.ld
+
diff --git a/1_wire/ld/stm32f103xE.ld b/1_wire/ld/stm32f103xE.ld
new file mode 100644
index 0000000..b0fcb69
--- /dev/null
+++ b/1_wire/ld/stm32f103xE.ld
@@ -0,0 +1,31 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2012 Karl Palsson <karlp@tweak.net.au>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Linker script for STM32F100x4, 16K flash, 4K RAM. */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH = 512K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 64K
+}
+
+/* Include the common ld script. */
+INCLUDE libopencm3_stm32f1.ld
+
diff --git a/1_wire/ld/stm32f103xF.ld b/1_wire/ld/stm32f103xF.ld
new file mode 100644
index 0000000..62d47db
--- /dev/null
+++ b/1_wire/ld/stm32f103xF.ld
@@ -0,0 +1,31 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2012 Karl Palsson <karlp@tweak.net.au>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Linker script for STM32F100x4, 16K flash, 4K RAM. */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH = 768K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 96K
+}
+
+/* Include the common ld script. */
+INCLUDE libopencm3_stm32f1.ld
+
diff --git a/1_wire/ld/stm32f103xG.ld b/1_wire/ld/stm32f103xG.ld
new file mode 100644
index 0000000..0c0c968
--- /dev/null
+++ b/1_wire/ld/stm32f103xG.ld
@@ -0,0 +1,31 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2012 Karl Palsson <karlp@tweak.net.au>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Linker script for STM32F100x4, 16K flash, 4K RAM. */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH = 1024K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH =  96K
+}
+
+/* Include the common ld script. */
+INCLUDE libopencm3_stm32f1.ld
+
diff --git a/1_wire/main.c b/1_wire/main.c
new file mode 100644
index 0000000..bb00ffe
--- /dev/null
+++ b/1_wire/main.c
@@ -0,0 +1,92 @@
+/*
+ * main.c
+ *
+ * Copyright 2014 Edward V. Emelianov <eddy@sao.ru, edward.emelianoff@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#include "main.h"
+#include "hardware_ini.h"
+#include "cdcacm.h"
+#include "onewire.h"
+
+volatile uint32_t Timer = 0; // global timer (milliseconds)
+usbd_device *usbd_dev;
+
+int main(){
+	uint32_t Old_timer = 0;
+
+	// RCC clocking: 8MHz oscillator -> 72MHz system
+	rcc_clock_setup_in_hse_8mhz_out_72mhz();
+
+	GPIO_init();
+
+	usb_disconnect(); // turn off USB while initializing all
+
+	// USB
+	usbd_dev = USB_init();
+
+	// SysTick is a system timer with 1ms period
+	SysTick_init();
+
+	// wait a little and then turn on USB pullup
+//	for (i = 0; i < 0x800000; i++)
+//		__asm__("nop");
+
+	usb_connect(); // turn on USB
+
+	init_ow_dmatimer();
+
+	while(1){
+		usbd_poll(usbd_dev);
+		if(usbdatalen){ // there's something in USB buffer
+			usbdatalen = parce_incoming_buf(usbdatabuf, usbdatalen);
+		}
+		//check_and_parce_UART(USART1); // also check data in UART buffers
+		check_btns();
+		if(Timer - Old_timer > 999){ // one-second cycle
+			Old_timer += 1000;
+		}else if(Timer < Old_timer){ // Timer overflow
+			Old_timer = 0;
+		}
+		OW_process();
+	}
+}
+
+
+/**
+ * SysTick interrupt: increment global time & send data buffer through USB
+ */
+void sys_tick_handler(){
+	Timer++;
+	usbd_poll(usbd_dev);
+	usb_send_buffer();
+}
+
+// pause function, delay in ms
+void Delay(uint16_t _U_ time){
+	uint32_t waitto = Timer + time;
+	while(Timer < waitto);
+}
+
+/**
+ * print current time in milliseconds: 4 bytes for ovrvlow + 4 bytes for time
+ * with ' ' as delimeter
+ */
+void print_time(){
+	print_int(Timer);
+}
diff --git a/1_wire/main.h b/1_wire/main.h
new file mode 100644
index 0000000..0cc7714
--- /dev/null
+++ b/1_wire/main.h
@@ -0,0 +1,55 @@
+/*
+ * main.h
+ *
+ * Copyright 2014 Edward V. Emelianov <eddy@sao.ru, edward.emelianoff@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+
+#pragma once
+#ifndef __MAIN_H__
+#define __MAIN_H__
+
+#include <stdlib.h>
+#include <string.h>					// memcpy
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/usart.h>
+#include <libopencm3/cm3/nvic.h>
+#include <libopencm3/usb/cdc.h>
+#include <libopencm3/usb/usbd.h>
+#include <libopencm3/cm3/systick.h>
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/adc.h>
+#include <libopencm3/stm32/dma.h>
+#include <libopencm3/stm32/spi.h>
+#include <libopencm3/stm32/timer.h>
+
+#define ADC_CHANNELS_NUMBER    (10)
+
+#include "sync.h" // mutexes
+#include "user_proto.h"
+
+#define _U_    __attribute__((__unused__))
+#define  U8(x)  ((uint8_t)  x)
+#define U16(x)  ((uint16_t) x)
+#define U32(x)  ((uint32_t) x)
+
+extern volatile uint32_t Timer; // global timer (milliseconds)
+void Delay(uint16_t time);
+
+#endif // __MAIN_H__
+
diff --git a/1_wire/onewire.bin b/1_wire/onewire.bin
new file mode 100755
index 0000000..2ce1fca
Binary files /dev/null and b/1_wire/onewire.bin differ
diff --git a/1_wire/onewire.c b/1_wire/onewire.c
new file mode 100644
index 0000000..12aff82
--- /dev/null
+++ b/1_wire/onewire.c
@@ -0,0 +1,526 @@
+/*
+ * onewire.c - functions to work with 1-wire devices
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+#include "onewire.h"
+#include "user_proto.h"
+
+OW_ID id_array[OW_MAX_NUM]; // 1-wire devices ID buffer (not more than eight)
+uint8_t dev_amount = 0;   // amount of 1-wire devices
+
+
+// states of 1-wire processing queue
+typedef enum{
+	OW_OFF_STATE,    // not working
+	OW_RESET_STATE,  // reset bus
+	OW_SEND_STATE,   // send data
+	OW_READ_STATE,   // wait for reading
+} OW_States;
+volatile OW_States OW_State = OW_OFF_STATE; // 1-wire state, 0-not runned
+
+void (*ow_process_resdata)() = NULL;
+
+
+uint16_t tim2_buff[TIM2_DMABUFF_SIZE];
+uint16_t tim2_inbuff[TIM2_DMABUFF_SIZE];
+int tum2buff_ctr = 0;
+uint8_t ow_done = 1;
+
+/**
+ * this function sends bits of ow_byte (LSB first) to 1-wire line
+ * @param ow_byte - byte to convert
+ * @param Nbits   - number of bits to send
+ * @param ini     - 1 to zero counter
+ */
+uint8_t OW_add_byte(uint8_t ow_byte){
+	uint8_t i, byte;
+	for(i = 0; i < 8; i++){
+		if(ow_byte & 0x01){
+			byte = BIT_ONE_P;
+		}else{
+			byte = BIT_ZERO_P;
+		}
+		if(tum2buff_ctr == TIM2_DMABUFF_SIZE){
+			ERR("Tim2 buffer overflow");
+			return 0; // avoid buffer overflow
+		}
+		tim2_buff[tum2buff_ctr++] = byte;
+		ow_byte >>= 1;
+	}
+	INT(tum2buff_ctr);
+	DBG(" bytes in send buffer\n");
+	return 1;
+}
+
+
+
+/**
+ * Adds Nbytes bytes 0xff  for reading sequence
+ */
+uint8_t OW_add_read_seq(uint8_t Nbytes){
+	uint8_t i;
+	if(Nbytes == 0) return 0;
+	Nbytes *= 8; // 8 bits for each byte
+	for(i = 0; i < Nbytes; i++){
+		if(tum2buff_ctr == TIM2_DMABUFF_SIZE){
+			ERR("Tim2 buffer overflow");
+			return 0;
+		}
+		tim2_buff[tum2buff_ctr++] = BIT_READ_P;
+	}
+	INT(tum2buff_ctr);
+	DBG(" bytes in send buffer\n");
+	return 1;
+}
+
+/**
+ * Fill output buffer with data from 1-wire
+ * @param start_idx - index from which to start (byte number)
+ * @param N         - data length (in **bytes**)
+ * @outbuf          - where to place data
+ */
+void read_from_OWbuf(uint8_t start_idx, uint8_t N, uint8_t *outbuf){
+	start_idx *= 8;
+	uint8_t i, j, last = start_idx + N * 8, byte;
+	if(last >= TIM2_DMABUFF_SIZE) last = TIM2_DMABUFF_SIZE;
+	for(i = start_idx; i < last;){
+		byte = 0;
+		for(j = 0; j < 8; j++){
+			byte >>= 1;
+			INT(tim2_inbuff[i]);
+			DBG(" ");
+			if(tim2_inbuff[i++] < ONE_ZERO_BARRIER)
+				byte |= 0x80;
+		}
+		*outbuf++ = byte;
+		DBG("readed \n");
+	}
+}
+// there's a mistake in opencm3, so redefine this if needed (TIM_CCMR2_CC3S_IN_TI1 -> TIM_CCMR2_CC3S_IN_TI4)
+#ifndef TIM_CCMR2_CC3S_IN_TI4
+#define TIM_CCMR2_CC3S_IN_TI4		(2)
+#endif
+void init_ow_dmatimer(){ // tim2_ch4 - PA3, no remap
+	gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
+			GPIO_CNF_OUTPUT_ALTFN_OPENDRAIN, GPIO3);
+	rcc_periph_clock_enable(RCC_TIM2);
+	rcc_periph_clock_enable(RCC_DMA1);
+	timer_reset(TIM2);
+	// timers have frequency of 1MHz -- 1us for one step
+	// 36MHz of APB1
+	timer_set_mode(TIM2, TIM_CR1_CKD_CK_INT, TIM_CR1_CMS_EDGE, TIM_CR1_DIR_UP);
+	// 72MHz div 72 = 1MHz
+	// TODO: WHY 71 if freq = 36MHz?
+	TIM2_PSC = 71;  // prescaler is (div - 1)
+	TIM2_CR1 = TIM_CR1_ARPE; // bufferize ARR/CCR
+	TIM2_ARR = RESET_LEN;
+	// PWM_OUT: TIM2_CH4; capture: TIM2_CH3
+	// PWM edge-aligned mode & enable preload for CCR4, CC3 takes input from TI4
+	TIM2_CCMR2 = TIM_CCMR2_OC4M_PWM1 | TIM_CCMR2_OC4PE | TIM_CCMR2_CC3S_IN_TI4;
+	TIM2_CCR4 = 0; // set output value to 1 by clearing CCR4
+	TIM2_EGR = TIM_EGR_UG; // update values of ARR & CCR4
+	// set low polarity for CC4, high for CC3 & enable CC4 out and CC3 in
+	TIM2_CCER = TIM_CCER_CC4P | TIM_CCER_CC4E | TIM_CCER_CC3E;
+
+	// TIM2_CH4 - DMA1, channel 7
+	dma_channel_reset(DMA1, DMA_CHANNEL7);
+	DMA1_CCR7 = DMA_CCR_DIR | DMA_CCR_MINC | DMA_CCR_PSIZE_16BIT | DMA_CCR_MSIZE_16BIT
+			| DMA_CCR_TEIE | DMA_CCR_TCIE | DMA_CCR_PL_HIGH;
+	nvic_enable_irq(NVIC_DMA1_CHANNEL7_IRQ); // enable dma1_channel7_isr
+	tum2buff_ctr = 0;
+	DBG("OW INITED\n");
+#ifdef EBUG
+	gpio_set(GPIOC, GPIO10);
+#endif
+}
+
+void run_dmatimer(){
+	ow_done = 0;
+	TIM2_CR1 = 0;
+	adc_disable_dma(ADC1); // turn off DMA & ADC
+	adc_off(ADC1);
+	DMA1_IFCR = DMA_ISR_TEIF7|DMA_ISR_HTIF7|DMA_ISR_TCIF7|DMA_ISR_GIF7 |
+		DMA_ISR_TEIF1|DMA_ISR_HTIF1|DMA_ISR_TCIF1|DMA_ISR_GIF1; // clear flags
+	DMA1_CCR7 &= ~DMA_CCR_EN; // disable (what if it's enabled?) to set address
+	DMA1_CPAR7 = (uint32_t) &(TIM_CCR4(TIM2)); // dma_set_peripheral_address(DMA1, DMA_CHANNEL7, (uint32_t) &(TIM_CCR4(TIM2)));
+	DMA1_CMAR7 = (uint32_t) &tim2_buff[1]; // dma_set_memory_address(DMA1, DMA_CHANNEL7, (uint32_t)tim2_buff);
+	DMA1_CNDTR7 = tum2buff_ctr-1;//dma_set_number_of_data(DMA1, DMA_CHANNEL7, tum2buff_ctr);
+	// TIM2_CH4 - DMA1, channel 7
+	dma_channel_reset(DMA1, DMA_CHANNEL1);
+	DMA1_CCR1 = DMA_CCR_MINC | DMA_CCR_PSIZE_16BIT | DMA_CCR_MSIZE_16BIT
+			| DMA_CCR_TEIE | DMA_CCR_TCIE | DMA_CCR_PL_HIGH;
+	DMA1_CPAR1 = (uint32_t) &(TIM_CCR3(TIM2)); //dma_set_peripheral_address(DMA1, DMA_CHANNEL1, (uint32_t) &(TIM_CCR3(TIM2)));
+	DMA1_CMAR1 = (uint32_t) tim2_inbuff; //dma_set_memory_address(DMA1, DMA_CHANNEL1, (uint32_t) tim2_inbuff);
+	DMA1_CNDTR1 = tum2buff_ctr; //dma_set_number_of_data(DMA1, DMA_CHANNEL1, tum2buff_ctr);
+	nvic_enable_irq(NVIC_DMA1_CHANNEL1_IRQ);
+
+	DMA1_CCR7 |= DMA_CCR_EN; //dma_enable_channel(DMA1, DMA_CHANNEL7);
+	DMA1_CCR1 |= DMA_CCR_EN; //dma_enable_channel(DMA1, DMA_CHANNEL1);
+
+	TIM2_SR = 0; // clear all flags
+	TIM2_ARR = BIT_LEN; // bit length
+	TIM2_CCR4 = tim2_buff[0]; // we should manually set first bit to avoid zero in tim2_inbuff[0]
+	TIM2_EGR = TIM_EGR_UG; // update value of ARR
+	TIM2_CR1 = TIM_CR1_ARPE; // bufferize ARR/CCR
+
+	TIM2_CR2 &= ~TIM_CR2_CCDS; // timer_set_dma_on_compare_event(TIM2);
+	TIM2_DIER = TIM_DIER_CC4DE | TIM_DIER_CC3DE; // enable DMA events
+	// set low polarity, enable cc out & enable input capture
+	TIM2_CR1 |= TIM_CR1_CEN; // run timer
+#ifdef EBUG
+	gpio_clear(GPIOC, GPIO10);
+#endif
+	DBG("RUN transfer of ");
+	INT(tum2buff_ctr);
+	DBG(" bits\n");
+}
+
+uint16_t rstat = 0, lastcc3 = 3;
+void ow_reset(){
+	//init_ow_dmatimer();
+	ow_done = 0;
+	rstat = 0;
+	TIM2_SR = 0; // clear all flags
+	TIM2_CR1 = 0;
+	TIM2_DIER = 0; // disable timer interrupts
+	TIM2_ARR = RESET_LEN; // set period to 1ms
+	TIM2_CCR4 = RESET_P; // zero pulse length
+	TIM2_EGR = TIM_EGR_UG; // update values of ARR & CCR4
+	//TIM2_CCMR2 = TIM_CCMR2_OC4M_PWM1 | TIM_CCMR2_OC4PE | TIM_CCMR2_CC3S_IN_TI4;
+	//TIM2_CCER = TIM_CCER_CC4P | TIM_CCER_CC4E | TIM_CCER_CC3E;
+	DBG("OW RESET in process");
+	TIM2_DIER = TIM_DIER_CC3IE;
+#ifdef EBUG
+	gpio_clear(GPIOC, GPIO10);
+#endif
+	TIM2_CR1 = TIM_CR1_OPM | TIM_CR1_CEN | TIM_CR1_UDIS; // we need only single pulse & run timer; disable UEV
+	TIM2_SR = 0; // clear update flag generated after timer's running
+	nvic_enable_irq(NVIC_TIM2_IRQ);
+}
+
+void tim2_isr(){
+	if(TIM2_SR & TIM_SR_UIF){ // update interrupt
+		TIM2_DIER = 0; // disable all timer interrupts
+#ifdef EBUG
+		gpio_set(GPIOC, GPIO10);
+#endif
+		TIM2_CCR4 = 0; // set output value to 1
+		TIM2_SR = 0; // clear flag
+		nvic_disable_irq(NVIC_TIM2_IRQ);
+		ow_done = 1;
+		rstat = lastcc3;
+		DBG(" ... done!\n");
+	}
+	if(TIM2_SR & TIM_SR_CC3IF){ // we need this interrupt to store CCR3 value
+		lastcc3 = TIM2_CCR3;
+		TIM2_CR1 &= ~TIM_CR1_UDIS; // enable UEV
+		TIM2_SR = 0; // clear flag (we've manage TIM_SR_UIF before, so can simply do =0)
+		TIM2_DIER |= TIM_DIER_UIE; // Now allow also Update interrupts to turn off everything
+	}
+}
+
+/**
+ * DMA interrupt in 1-wire mode
+ */
+void dma1_channel1_isr(){
+			int i;
+	if(DMA1_ISR & DMA_ISR_TCIF1){
+#ifdef EBUG
+		gpio_set(GPIOC, GPIO10);
+#endif
+		DMA1_IFCR = DMA_IFCR_CTCIF1;
+		TIM2_CR1 &= ~TIM_CR1_CEN;    // timer_disable_counter(TIM2);
+		DMA1_CCR1 &= ~DMA_CCR_EN; // disable DMA1 channel 1
+		nvic_disable_irq(NVIC_DMA1_CHANNEL1_IRQ);
+		ow_done = 1;
+			for(i = 0; i < tum2buff_ctr; i++){
+				print_int(tim2_inbuff[i]);
+				P(" ");
+			}
+			P("\n");
+	}else if(DMA1_ISR & DMA_ISR_TEIF1){
+		DMA1_IFCR = DMA_IFCR_CTEIF1;
+		DBG("DMA in transfer error\n");
+	}
+}
+
+void dma1_channel7_isr(){
+	if(DMA1_ISR & DMA_ISR_TCIF7){
+		DMA1_IFCR = DMA_IFCR_CTCIF7; // clear flag
+		DMA1_CCR7 &= ~DMA_CCR_EN; // disable DMA1 channel 7
+	}else if(DMA1_ISR & DMA_ISR_TEIF7){
+		DMA1_IFCR = DMA_IFCR_CTEIF7;
+		DBG("DMA out transfer error\n");
+	}
+}
+
+
+uint8_t OW_get_reset_status(){
+	if(rstat < RESET_BARRIER) return 0; // no devices
+	return 1;
+}
+
+
+uint8_t ow_data_ready = 0;   // flag of reading OK
+
+/**
+ * Process 1-wire commands depending on its state
+ */
+void OW_process(){
+	static uint8_t ow_was_reseting = 0;
+	switch(OW_State){
+		case OW_OFF_STATE:
+			return;
+		break;
+		case OW_RESET_STATE:
+			DBG("OW reset\n");
+			OW_State = OW_SEND_STATE;
+			ow_was_reseting = 1;
+			ow_reset();
+		break;
+		case OW_SEND_STATE:
+			if(!ow_done) return; // reset in work
+			if(ow_was_reseting){
+				if(rstat < RESET_BARRIER){
+					ERR("Error: no 1-wire devices found");
+					INT(rstat);
+					DBG("\n");
+					ow_was_reseting = 0;
+					OW_State = OW_OFF_STATE;
+					return;
+				}
+			}
+			ow_was_reseting = 0;
+			OW_State = OW_READ_STATE;
+			run_dmatimer(); // turn on data transfer
+			DBG("OW send\n");
+		break;
+		case OW_READ_STATE:
+			if(!ow_done) return; // data isn't ready
+			OW_State = OW_OFF_STATE;
+		//	adc_dma_on(); // return DMA1_1 to ADC at end of data transmitting
+			if(ow_process_resdata){
+				ow_process_resdata();
+				ow_process_resdata = NULL;
+			}
+			ow_data_ready = 1;
+			DBG("OW read\n");
+		break;
+	}
+}
+
+
+uint8_t *read_buf = NULL;    // buffer for storing readed data
+/**
+ * fill ID buffer with readed data
+ */
+void fill_buff_with_data(){
+	if(!read_buf) return;
+	read_from_OWbuf(1, 8, read_buf);
+	int i, j;
+	// now check stored ROMs
+	for(i = 0; i < dev_amount; ++i){
+		uint8_t *ROM = id_array[i].bytes;
+		for(j = 0; j < 8; j++)
+			if(ROM[j] != read_buf[j]) break;
+		if(j == 8){ // we found this cell
+			DBG("Such ID exists\n");
+			goto ret;
+		}
+	}
+	++dev_amount;
+ret:
+	read_buf = NULL;
+}
+
+/**
+ * fill Nth array with identificators
+ */
+//uint8_t comtosend = 0;
+void OW_fill_next_ID(){
+	if(dev_amount >= OW_MAX_NUM){
+		ERR("No memory left for new device\n");
+		return;
+	}
+	ow_data_ready = 0;
+	OW_State = OW_RESET_STATE;
+	OW_reset_buffer();
+	OW_add_byte(OW_READ_ROM);
+	OW_add_read_seq(8); // wait for 8 bytes
+	read_buf = id_array[dev_amount].bytes;
+	ow_process_resdata = fill_buff_with_data;
+	DBG("wait for ID\n");
+}
+
+/**
+ * Procedure of 1-wire communications
+ * variables:
+ * @param sendReset - send RESET before transmission
+ * @param command - bytes sent to the bus (if we want to read, send OW_READ_SLOT)
+ * @param cLen - command buffer length (how many bytes to send)
+ * @return 1 if succeed, 0 if failure
+ */
+uint8_t OW_Send(uint8_t sendReset, uint8_t *command, uint8_t cLen){
+	ow_data_ready = 0;
+	// if reset needed - send RESET and check bus
+	if(sendReset)
+		OW_State = OW_RESET_STATE;
+	else
+		OW_State = OW_SEND_STATE;
+	OW_reset_buffer();
+	while(cLen-- > 0){
+		if(!OW_add_byte(*command++)) return 0;
+	}
+	return 1;
+}
+
+/**
+ * convert temperature from scratchpad
+ * in case of error return 200000 (ERR_TEMP_VAL)
+ * return value in 10th degrees centigrade
+ *
+ * 0 - themperature LSB
+ * 1 - themperature MSB (all higher bits are sign)
+ * 2 - T_H
+ * 3 - T_L
+ * 4 - B20: Configuration register (only bits 6/5 valid: 9..12 bits resolution); 0xff for S20
+ * 5 - 0xff (reserved)
+ * 6 - (reserved for B20); S20: COUNT_REMAIN (0x0c)
+ * 7 - COUNT PER DEGR (0x10)
+ * 8 - CRC
+ */
+int32_t gettemp(uint8_t *scratchpad){
+	// detect DS18S20
+	int32_t t = 0;
+	uint8_t l,m;
+	int8_t v;
+	if(scratchpad[7] == 0xff) // 0xff can be only if there's no such device or some other error
+		return ERR_TEMP_VAL;
+	m = scratchpad[1];
+	l = scratchpad[0];
+	if(scratchpad[4] == 0xff){ // DS18S20
+		v = l >> 1 | (m & 0x80); // take signum from MSB
+		t = ((int32_t)v) * 10L;
+		if(l&1) t += 5L; // decimal 0.5
+	}else{
+		v = l>>4 | ((m & 7)<<4) | (m & 0x80);
+		t = ((int32_t)v) * 10L;
+		m = l & 0x0f; // add decimal
+		t += (int32_t)m; // t = v*10 + l*1.25 -> convert
+		if(m > 1) ++t; // 1->1, 2->3, 3->4, 4->5, 5->6
+		else if(m > 5) t += 2L; // 6->8, 7->9
+	}
+	return t;
+}
+
+int32_t temperature = ERR_TEMP_VAL;
+int8_t Ncur = 0;
+/**
+ * get temperature from buffer
+ */
+void convert_next_temp(){
+	uint8_t scratchpad[9];
+	if(dev_amount < 2){
+		read_from_OWbuf(2, 9, scratchpad);
+	}else{
+		read_from_OWbuf(10, 9, scratchpad);
+	}
+	temperature = gettemp(scratchpad);
+	DBG("Readed temperature: ");
+	INT(temperature);
+	DBG("/10 degrC\n");
+}
+
+/**
+ * read next stored thermometer
+ */
+void OW_read_next_temp(){
+	ow_data_ready = 0;
+	OW_State = OW_RESET_STATE;
+	OW_reset_buffer();
+	int i;
+	if(dev_amount < 2){
+		Ncur = -1;
+		OW_add_byte(OW_SKIP_ROM);
+	}else{
+		if(++Ncur >= dev_amount) Ncur = 0;
+		OW_add_byte(OW_MATCH_ROM);
+		uint8_t *ROM = id_array[Ncur].bytes;
+		for(i = 0; i < 8; ++i)
+			OW_add_byte(ROM[i]);
+	}
+	OW_add_byte(OW_READ_SCRATCHPAD);
+	OW_add_read_seq(9); // wait for 9 bytes - ROM
+	ow_process_resdata = convert_next_temp;
+}
+
+void OW_send_read_seq(){
+	ow_data_ready = 0;
+	OW_State = OW_RESET_STATE;
+	OW_reset_buffer();
+	OW_add_byte(OW_SKIP_ROM);
+	OW_add_byte(OW_CONVERT_T);
+	ow_process_resdata = NULL;
+}
+/*
+ * scan 1-wire bus
+ * WARNING! The procedure works in real-time, so it is VERY LONG
+ * 		num - max number of devices
+ * 		buf - array for devices' ID's (8*num bytes)
+ * return amount of founded devices
+ *
+uint8_t OW_Scan(uint8_t *buf, uint8_t num){
+	unsigned long path,next,pos;
+	uint8_t bit,chk;
+	uint8_t cnt_bit, cnt_byte, cnt_num;
+	path=0;
+	cnt_num=0;
+	do{
+		//(issue the 'ROM search' command)
+		if( 0 == OW_WriteCmd(OW_SEARCH_ROM) ) return 0;
+		OW_Wait_TX();
+		OW_ClearBuff(); // clear RX buffer
+		next = 0; // next path to follow
+		pos = 1;  // path bit pointer
+		for(cnt_byte = 0; cnt_byte != 8; cnt_byte++){
+			buf[cnt_num*8 + cnt_byte] = 0;
+			for(cnt_bit = 0; cnt_bit != 8; cnt_bit++){
+				//(read two bits, 'bit' and 'chk', from the 1-wire bus)
+				OW_SendBits(OW_R, 2);
+				OW_Wait_TX();
+				bit = -----OW_ReadByte();
+				chk = bit & 0x02; // bit 1
+				bit = bit & 0x01; // bit 0
+				if(bit && chk) return 0; // error
+				if(!bit && !chk){ // collision, both are zero
+					if (pos & path) bit = 1;     // if we've been here before
+					else next = (path&(pos-1)) | pos; // else, new branch for next
+					pos <<= 1;
+				}
+				//(save this bit as part of the current ROM value)
+				if (bit) buf[cnt_num*8 + cnt_byte]|=(1<<cnt_bit);
+				//(write 'bit' to the 1-wire bus)
+				OW_SendBits(bit, 1);
+				OW_Wait_TX();
+			}
+		}
+		path=next;
+		cnt_num++;
+	}while(path && cnt_num < num);
+	return cnt_num;
+}*/
+
diff --git a/1_wire/onewire.h b/1_wire/onewire.h
new file mode 100644
index 0000000..8beb01e
--- /dev/null
+++ b/1_wire/onewire.h
@@ -0,0 +1,136 @@
+/*
+ * onewire.h
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#pragma once
+#ifndef __ONEWIRE_H__
+#define __ONEWIRE_H__
+
+#include "main.h"
+#include "hardware_ini.h"
+
+#define TIM2_DMABUFF_SIZE 128
+
+// freq = 1MHz
+// ARR values: 1000 for reset, 100 for data in/out
+// CCR2 values: 500 for reset, 60 for sending 0 or reading, <15 for sending 1
+// CCR1 values: >550 if there's devices on line (on reset), >12 (typ.15) - read 0, < 12 (typ.1) - read 1
+#define RESET_LEN         ((uint16_t)1000)
+#define BIT_LEN           ((uint16_t)100)
+#define RESET_P           ((uint16_t)500)
+#define BIT_ONE_P         ((uint16_t)10)
+#define BIT_ZERO_P        ((uint16_t)60)
+#define BIT_READ_P        ((uint16_t)5)
+#define RESET_BARRIER     ((uint16_t)550)
+#define ONE_ZERO_BARRIER  ((uint16_t)10)
+
+#define ERR_TEMP_VAL  (200000)
+
+typedef struct{
+	uint8_t bytes[8];
+} OW_ID;
+
+extern OW_ID id_array[];
+
+#define OW_MAX_NUM 8
+
+void init_ow_dmatimer();
+void run_dmatimer();
+extern uint8_t ow_done;
+#define OW_READY()  (ow_done)
+void ow_dma_on();
+uint8_t OW_add_byte(uint8_t ow_byte);
+uint8_t OW_add_read_seq(uint8_t Nbytes);
+void read_from_OWbuf(uint8_t start_idx, uint8_t N, uint8_t *outbuf);
+void ow_reset();
+uint8_t OW_get_reset_status();
+
+extern int tum2buff_ctr;
+#define OW_reset_buffer()   do{tum2buff_ctr = 0;}while(0)
+
+extern uint8_t ow_data_ready;
+#define OW_DATA_READY()       (ow_data_ready)
+#define OW_CLEAR_READY_FLAG() do{ow_data_ready = 0;}while(0)
+
+void OW_process();
+void OW_fill_next_ID();
+void OW_send_read_seq();
+uint8_t OW_Send(uint8_t sendReset, uint8_t *command, uint8_t cLen);
+
+extern int32_t temperature;
+extern int8_t Ncur;
+void OW_read_next_temp();
+#define OW_current_temp()  (temperature)
+#define OW_current_num()   (Ncur)
+
+/*
+ * thermometer commands
+ * send them with bus reset!
+ */
+// find devices
+#define OW_SEARCH_ROM       (0xf0)
+// read device (when it is alone on the bus)
+#define OW_READ_ROM         (0x33)
+// send device ID (after this command - 8 bytes of ID)
+#define OW_MATCH_ROM        (0x55)
+// broadcast command
+#define OW_SKIP_ROM         (0xcc)
+// find devices with critical conditions
+#define OW_ALARM_SEARCH     (0xec)
+/*
+ * thermometer functions
+ * send them without bus reset!
+ */
+// start themperature reading
+#define OW_CONVERT_T         (0x44)
+// write critical temperature to device's RAM
+#define OW_SCRATCHPAD        (0x4e)
+// read whole device flash
+#define OW_READ_SCRATCHPAD   (0xbe)
+// copy critical themperature from device's RAM to its EEPROM
+#define OW_COPY_SCRATCHPAD   (0x48)
+// copy critical themperature from EEPROM to RAM (when power on this operation runs automatically)
+#define OW_RECALL_E2         (0xb8)
+// check whether there is devices wich power up from bus
+#define OW_READ_POWER_SUPPLY (0xb4)
+
+
+/*
+ * thermometer identificator is: 8bits CRC, 48bits serial, 8bits device code (10h)
+ * Critical temperatures is T_H and T_L
+ * T_L is lowest allowed temperature
+ * T_H is highest -//-
+ * format T_H and T_L: 1bit sigh + 7bits of data
+ */
+
+
+/*
+ * RAM register:
+ * 0 - themperature: 1 ADU == 0.5 degrC
+ * 1 - sign (0 - T>0 degrC ==> T=byte0; 1 - T<0 degrC ==> T=byte0-0xff+1)
+ * 2 - T_H
+ * 3 - T_L
+ * 4 - 0xff (reserved)
+ * 5 - 0xff (reserved)
+ * 6 - COUNT_REMAIN (0x0c)
+ * 7 - COUNT PER DEGR (0x10)
+ * 8 - CRC
+ */
+
+
+#endif // __ONEWIRE_H__
diff --git a/1_wire/sync.c b/1_wire/sync.c
new file mode 100644
index 0000000..ba688c3
--- /dev/null
+++ b/1_wire/sync.c
@@ -0,0 +1,93 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2012 Fergus Noble <fergusnoble@gmail.com>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * TODO:
+ *   implement mutexes for other type of MCU (which doesn't have strex & ldrex)
+ */
+
+#include <libopencm3/cm3/sync.h>
+
+/* DMB is supported on CM0 */
+void __dmb()
+{
+	__asm__ volatile ("dmb");
+}
+
+/* Those are defined only on CM3 or CM4 */
+#if defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__)
+
+uint32_t __ldrex(volatile uint32_t *addr)
+{
+	uint32_t res;
+	__asm__ volatile ("ldrex %0, [%1]" : "=r" (res) : "r" (addr));
+	return res;
+}
+
+uint32_t __strex(uint32_t val, volatile uint32_t *addr)
+{
+	uint32_t res;
+	__asm__ volatile ("strex %0, %2, [%1]"
+			  : "=&r" (res) : "r" (addr), "r" (val));
+	return res;
+}
+
+void mutex_lock(mutex_t *m)
+{
+	uint32_t status = 0;
+
+	do {
+		/* Wait until the mutex is unlocked. */
+		while (__ldrex(m) != MUTEX_UNLOCKED);
+
+		/* Try to acquire it. */
+		status = __strex(MUTEX_LOCKED, m);
+
+	/* Did we get it? If not then try again. */
+	} while (status != 0);
+
+	/* Execute the mysterious Data Memory Barrier instruction! */
+	__dmb();
+}
+
+void mutex_unlock(mutex_t *m)
+{
+	/* Ensure accesses to protected resource are finished */
+	__dmb();
+
+	/* Free the lock. */
+	*m = MUTEX_UNLOCKED;
+}
+
+/*
+ * Try to lock mutex
+ * if it's already locked or there was error in STREX, return MUTEX_LOCKED
+ * else return MUTEX_UNLOCKED
+ */
+mutex_t mutex_trylock(mutex_t *m){
+	uint32_t status = 0;
+	mutex_t old_lock = __ldrex(m); // get mutex value
+	// set mutex
+	status = __strex(MUTEX_LOCKED, m);
+	if(status == 0) __dmb();
+	else old_lock = MUTEX_LOCKED;
+	return old_lock;
+}
+
+#endif
diff --git a/1_wire/sync.h b/1_wire/sync.h
new file mode 100644
index 0000000..bfe837b
--- /dev/null
+++ b/1_wire/sync.h
@@ -0,0 +1,53 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2012 Fergus Noble <fergusnoble@gmail.com>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef LIBOPENCM3_CM3_SYNC_H
+#define LIBOPENCM3_CM3_SYNC_H
+
+void __dmb(void);
+
+/* Implements synchronisation primitives as discussed in the ARM document
+ * DHT0008A (ID081709) "ARM Synchronization Primitives" and the ARM v7-M
+ * Architecture Reference Manual.
+*/
+
+/* --- Exclusive load and store instructions ------------------------------- */
+
+/* Those are defined only on CM3 or CM4 */
+#if defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__)
+
+uint32_t __ldrex(volatile uint32_t *addr);
+uint32_t __strex(uint32_t val, volatile uint32_t *addr);
+
+/* --- Convenience functions ----------------------------------------------- */
+
+/* Here we implement some simple synchronisation primitives. */
+
+typedef uint32_t mutex_t;
+
+#define MUTEX_UNLOCKED 0
+#define MUTEX_LOCKED   1
+
+void mutex_lock(mutex_t *m);
+void mutex_unlock(mutex_t *m);
+mutex_t mutex_trylock(mutex_t *m);
+
+#endif
+
+#endif
diff --git a/1_wire/user_proto.c b/1_wire/user_proto.c
new file mode 100644
index 0000000..1367a08
--- /dev/null
+++ b/1_wire/user_proto.c
@@ -0,0 +1,240 @@
+/*
+ * user_proto.c
+ *
+ * Copyright 2014 Edward V. Emelianov <eddy@sao.ru, edward.emelianoff@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#include "cdcacm.h"
+#include "main.h"
+#include "hardware_ini.h"
+#include "onewire.h"
+
+// integer value given by user
+static volatile int32_t User_value = 0;
+enum{
+	UVAL_START,		// user start to write integer value
+	UVAL_ENTERED,	// value entered but not printed
+	UVAL_BAD		// entered bad value
+};
+uint8_t Uval_ready = UVAL_BAD;
+
+int read_int(char *buf, int cnt);
+
+intfun I = NULL; // function to process entered integer
+
+#define READINT() do{i += read_int(&buf[i+1], len-i-1);}while(0)
+
+void help(){
+	P("H\tshow this help\n");
+	P("I\ttest entering integer value\n");
+	P("T\tshow current approx. time\n");
+	P("1\tswitch LED D1 state\n");
+	P("2\tswitch LED D2 state\n");
+	P("R\tstart reading temperature\n");
+	P("P\tread DS18 ID\n");
+	P("Q\tget temperature\n");
+}
+
+/**
+ * show entered integer value
+ */
+uint8_t show_int(int32_t v){
+	newline();
+	print_int(v);
+	newline();
+	return 0;
+}
+
+/**
+ * parce command buffer buf with length len
+ * return 0 if buffer processed or len if there's not enough data in buffer
+ */
+int parce_incoming_buf(char *buf, int len){
+	uint8_t command;
+	//uint32_t utmp;
+	int i = 0;
+	if(Uval_ready == UVAL_START){ // we are in process of user's value reading
+		i += read_int(buf, len);
+	}
+	if(Uval_ready == UVAL_ENTERED){
+		//print_int(User_value); // printout readed integer value for error control
+		Uval_ready = UVAL_BAD; // clear Uval
+		I(User_value);
+		return 0;
+	}
+	for(; i < len; i++){
+		command = buf[i];
+		if(!command) continue; // omit zero
+		switch (command){
+			case '1':
+				gpio_toggle(LEDS_PORT, LED_D1_PIN);
+			break;
+			case '2':
+				gpio_toggle(LEDS_PORT, LED_D2_PIN);
+			break;
+			case 'H': // show help
+				help();
+			break;
+			case 'I': // enter integer & show its value
+				I = show_int;
+				READINT();
+			break;
+			case 'T':
+				newline();
+				print_int(Timer); // be careful for Time >= 2^{31}!!!
+				newline();
+			break;
+			case 'P':
+				OW_fill_next_ID();
+			break;
+			case 'Q':
+				OW_read_next_temp();
+			break;
+			case 'R':
+				OW_send_read_seq();
+			break;
+			case '\n': // show newline, space and tab as is
+			case '\r':
+			case ' ':
+			case '\t':
+			break;
+			default:
+				command = '?'; // echo '?' on unknown command in byte mode
+		}
+		usb_send(command); // echo readed byte
+	}
+	return 0; // all data processed - 0 bytes leave in buffer
+}
+
+/**
+ * Send char array wrd thru USB or UART
+ */
+void prnt(uint8_t *wrd){
+	if(!wrd) return;
+	while(*wrd) usb_send(*wrd++);
+}
+
+void ERR(char *wrd){
+	if(!wrd) return;
+	while(*wrd) usb_send(*((uint8_t*)wrd++));
+	usb_send('\n');
+}
+
+/**
+ * Read from TTY integer value given by user (in DEC).
+ *    Reading stops on first non-numeric symbol.
+ *    To work with symbol terminals reading don't stops on buffer's end,
+ *    it waits for first non-numeric char.
+ *    When working on string terminals, terminate string by '\n', 0 or any other symbol
+ * @param buf - buffer to read from
+ * @param cnt - buffer length
+ * @return amount of readed symbols
+ */
+int read_int(char *buf, int cnt){
+	int readed = 0, i;
+	static int enteredDigits; // amount of entered digits
+	static int sign; // sign of readed value
+	if(Uval_ready){ // this is first run
+		Uval_ready = UVAL_START; // clear flag
+		enteredDigits = 0; // 0 digits entered
+		User_value = 0; // clear value
+		sign = 1; // clear sign
+	}
+	if(!cnt) return 0;
+	for(i = 0; i < cnt; i++, readed++){
+		uint8_t chr = buf[i];
+		if(chr == '-'){
+			if(enteredDigits == 0){ // sign should be first
+				sign = -1;
+				continue;
+			}else{ // '-' after number - reject entered value
+				Uval_ready = UVAL_BAD;
+				break;
+			}
+		}
+		if(chr < '0' || chr > '9'){
+			if(enteredDigits)
+				Uval_ready = UVAL_ENTERED;
+			else
+				Uval_ready = UVAL_BAD; // bad symbol
+			break;
+		}
+		User_value = User_value * 10 + (int32_t)(chr - '0');
+		enteredDigits++;
+	}
+	if(Uval_ready == UVAL_ENTERED) // reading has met an non-numeric character
+		User_value *= sign;
+	return readed;
+}
+
+/**
+ * Print buff as hex values
+ * @param buf - buffer to print
+ * @param l   - buf length
+ * @param s   - function to send a byte
+ */
+void print_hex(uint8_t *buff, uint8_t l){
+	void putc(uint8_t c){
+		if(c < 10)
+			usb_send(c + '0');
+		else
+			usb_send(c + 'a' - 10);
+	}
+	usb_send('0'); usb_send('x'); // prefix 0x
+	while(l--){
+		putc(buff[l] >> 4);
+		putc(buff[l] & 0x0f);
+	}
+}
+
+/**
+ * Print decimal integer value
+ * @param N - value to print
+ * @param s - function to send a byte
+ */
+void print_int(int32_t N){
+	uint8_t buf[10], L = 0;
+	if(N < 0){
+		usb_send('-');
+		N = -N;
+	}
+	if(N){
+		while(N){
+			buf[L++] = N % 10 + '0';
+			N /= 10;
+		}
+		while(L--) usb_send(buf[L]);
+	}else usb_send('0');
+}
+
+void OW_printID(uint8_t N){
+	void putc(uint8_t c){
+		if(c < 10)
+			usb_send(c + '0');
+		else
+			usb_send(c + 'a' - 10);
+	}
+	int i;
+	uint8_t *b = id_array[N].bytes;
+	usb_send('0'); usb_send('x'); // prefix 0x
+	for(i = 0; i < 8; i++){
+		putc(b[i] >> 4);
+		putc(b[i] & 0x0f);
+	}
+	usb_send('\n');
+}
diff --git a/1_wire/user_proto.h b/1_wire/user_proto.h
new file mode 100644
index 0000000..c3c6229
--- /dev/null
+++ b/1_wire/user_proto.h
@@ -0,0 +1,51 @@
+/*
+ * user_proto.h
+ *
+ * Copyright 2014 Edward V. Emelianov <eddy@sao.ru, edward.emelianoff@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#pragma once
+#ifndef __USER_PROTO_H__
+#define __USER_PROTO_H__
+
+#include "cdcacm.h"
+
+// shorthand for prnt
+#define P(arg)    do{prnt((uint8_t*)arg);}while(0)
+// debug message - over USB
+#ifdef EBUG
+	#define DBG(a)    do{prnt((uint8_t*)a);}while(0)
+	#define INT(N)    do{print_int(N);}while(0)
+#else
+	#define DBG(a)
+	#define INT(N)
+#endif
+
+typedef uint8_t (*intfun)(int32_t);
+
+void ERR(char *wrd);
+void prnt(uint8_t *wrd);
+#define newline()   usb_send('\n')
+
+void print_int(int32_t N);
+void print_hex(uint8_t *buff, uint8_t l);
+
+int parce_incoming_buf(char *buf, int len);
+void OW_printID(uint8_t N);
+
+#endif // __USER_PROTO_H__
diff --git a/simple_cdc/hardware_ini.c b/simple_cdc/hardware_ini.c
index 262a692..ee3e0d7 100644
--- a/simple_cdc/hardware_ini.c
+++ b/simple_cdc/hardware_ini.c
@@ -69,17 +69,26 @@ void SysTick_init(){
 void check_btns(){
 	static uint8_t oldstate[2] = {1,1}; // old buttons state
 	uint8_t newstate[2], i;
+	static uint32_t Old_timer[2] = {0,0};
 	newstate[0] = gpio_get(BTNS_PORT, BTN_S2_PIN) ? 1 : 0;
 	newstate[1] = gpio_get(BTNS_PORT, BTN_S3_PIN) ? 1 : 0;
 	for(i = 0; i < 2; i++){
 		uint8_t new = newstate[i];
-		if(new != oldstate[i]){
-			P("Button S");
-			usb_send('2' + i);
-			if(new) P("pressed");
-			else P("released");
-			newline();
-			oldstate[i] = new;
+		// pause for 60ms
+		uint32_t O = Old_timer[i];
+		if(!O){
+			if(Timer - O > 60 || O > Timer){
+				P("Button S");
+				usb_send('2' + i);
+				if(new) P("released");
+				else P("pressed");
+				newline();
+				oldstate[i] = new;
+				Old_timer[i] = 0;
+			}
+		}
+		else if(new != oldstate[i]){
+			Old_timer[i] = Timer;
 		}
 	}
 }
diff --git a/simple_cdc/usb_cdc_simple.bin b/simple_cdc/usb_cdc_simple.bin
index e78d8fb..7d1b123 100755
Binary files a/simple_cdc/usb_cdc_simple.bin and b/simple_cdc/usb_cdc_simple.bin differ