diff --git a/.gitignore b/.gitignore
index fbe509b..4e8bab8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,4 +7,6 @@
 *.pho
 *.drl
 *.pdf
+*.svg
 .hg*
+.dropbox.attr
diff --git a/schematic/STM32_PINS b/schematic/STM32_PINS
index 2b9c531..e9b810e 100644
--- a/schematic/STM32_PINS
+++ b/schematic/STM32_PINS
@@ -52,9 +52,9 @@ Functional map of MCU pins
 049     VSS     GND
 050     VDD     +3.3V
 051     PB12    -
-052     SPI2_SCK     \
-053     SPI2_MISO     |         External SPI connection (at edge of the board)
-054     SPI2_MOSI    /
+052     PB13    Shtr_cam (signal from camera electronics, 0 to open, high prio)  \
+053     PB14    Shtr_man (signal from manual switch, 0 to open, low priority)    |  External signals connector (at edge of the board)
+054     PB15                                                                     /
 055     PD8     -
 056     PD9     -
 057     PD10    EXT0\
@@ -95,8 +95,8 @@ Functional map of MCU pins
 092     PB6     Tur3_1   \      Upper filters turret Hall 1,2
 093     PB7     Tur3_2   /
 094     BOOT    BOOT            Button to boot from bootloader
-095     I2C_SCL/CANRX    \      External CAN connection (or I2S, etc)
-096     I2C_SDA/CANTX    /
+095     PB8     LED_status  \   LED indicators: status lights when all OK
+096     PB9     LED_shutter /   shutter LED lights when shutter opened
 097     PE0     DIR_1           direction of SM 1,2
 098     PE1     DIR_2
 099     VSS     GND
diff --git a/with_opencm3/STM32_PINS b/with_opencm3/STM32_PINS
index 2b9c531..cd016cf 100644
--- a/with_opencm3/STM32_PINS
+++ b/with_opencm3/STM32_PINS
@@ -52,9 +52,9 @@ Functional map of MCU pins
 049     VSS     GND
 050     VDD     +3.3V
 051     PB12    -
-052     SPI2_SCK     \
-053     SPI2_MISO     |         External SPI connection (at edge of the board)
-054     SPI2_MOSI    /
+052     PB13    SPI2_SCK     \
+053     PB14    SPI2_MISO    |    SPI connection (near USB connector)
+054     PB15    SPI2_MOSI    /
 055     PD8     -
 056     PD9     -
 057     PD10    EXT0\
@@ -89,14 +89,14 @@ Functional map of MCU pins
 086     PD5     | Tur2          Middle filters turret Hall sensors
 087     PD6     /
 088     PD7     Tur3_0          Upper filters turret Hall 0
-089     SPI1_SCK           \
-090     SPI1_MISO          |    SPI connection (near USB connector)
-091     SPI1_MOSI/I2C_SMBAI/
+089     PB3/SPI1_SCK    Shtr_cam (signal from camera electronics, 0 to open, high prio)  \
+090     PB4/SPI1_MISO   Shtr_man (signal from manual switch, 0 to open, low priority)    |  External signals connector (near USB)
+091     PB5/SPI1_MOSI   Shtf_fb  (shutter feedback, ==0 when opened)                     /
 092     PB6     Tur3_1   \      Upper filters turret Hall 1,2
 093     PB7     Tur3_2   /
 094     BOOT    BOOT            Button to boot from bootloader
-095     I2C_SCL/CANRX    \      External CAN connection (or I2S, etc)
-096     I2C_SDA/CANTX    /
+095     PB8/CanRx  LED_status  \   LED indicators: status lights when all OK
+096     PB9/CanTx  LED_shutter /   shutter LED lights when shutter opened
 097     PE0     DIR_1           direction of SM 1,2
 098     PE1     DIR_2
 099     VSS     GND
diff --git a/with_opencm3/cdcacm.c b/with_opencm3/cdcacm.c
index c383d82..f244bc9 100644
--- a/with_opencm3/cdcacm.c
+++ b/with_opencm3/cdcacm.c
@@ -45,7 +45,7 @@ static const struct usb_device_descriptor dev = {
 	.bNumConfigurations = 1,
 };
 
-char usbdatabuf[64]; // buffer for received data
+char usbdatabuf[USB_RX_DATA_SIZE]; // buffer for received data
 int usbdatalen = 0;  // lenght of received data
 
 /*
@@ -199,9 +199,11 @@ static int cdcacm_control_request(usbd_device *usbd_dev, struct usb_setup_data *
 	switch (req->bRequest) {
 	case SET_CONTROL_LINE_STATE:{
 #ifdef EBUG
-		P("SET_CONTROL_LINE_STATE\n", uart1_send);
-		print_int(req->wValue, uart1_send);
-		newline(uart1_send);
+		if(mode == BYTE_MODE){
+			P("SET_CONTROL_LINE_STATE\n", uart1_send);
+			print_int(req->wValue, uart1_send);
+			newline(uart1_send);
+		}
 #endif
 		if(req->wValue){ // terminal is opened
 			USB_connected = 1;
@@ -228,13 +230,15 @@ static int cdcacm_control_request(usbd_device *usbd_dev, struct usb_setup_data *
 	}break;
 	case SET_LINE_CODING:
 #ifdef EBUG
-		P("SET_LINE_CODING, len=", uart1_send);
+		if(mode == BYTE_MODE) P("SET_LINE_CODING, len=", uart1_send);
 #endif
 		if (!len || (*len != sizeof(struct usb_cdc_line_coding)))
 			return 0;
 #ifdef EBUG
-		print_int(*len, uart1_send);
-		newline(uart1_send);
+		if(mode == BYTE_MODE){
+			print_int(*len, uart1_send);
+			newline(uart1_send);
+		}
 #endif
 		memcpy((void *)&lc, (void *)*buf, *len);
 		// Mark & Space parity don't support by hardware, check it
@@ -250,12 +254,12 @@ static int cdcacm_control_request(usbd_device *usbd_dev, struct usb_setup_data *
 			memcpy((void *)*buf, (void *)&linecoding, sizeof(struct usb_cdc_line_coding));
 		//usbd_ep_write_packet(usbd_dev, 0x83, (char*)&linecoding, sizeof(linecoding));
 #ifdef EBUG
-		P("GET_LINE_CODING\n", uart1_send);
+		if(mode == BYTE_MODE) P("GET_LINE_CODING\n", uart1_send);
 #endif
 	break;
 	default:
 #ifdef EBUG
-		P("UNKNOWN\n", uart1_send);
+		if(mode == BYTE_MODE) P("UNKNOWN\n", uart1_send);
 #endif
 		return 0;
 	}
@@ -264,8 +268,11 @@ static int cdcacm_control_request(usbd_device *usbd_dev, struct usb_setup_data *
 
 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, USB_RX_DATA_SIZE - usbdatalen);
+	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;
+	}
 	//if(len > 0) parce_incoming_buf(buf, len, usb_send);
 }
 
diff --git a/with_opencm3/flash.c b/with_opencm3/flash.c
index c112022..8fc7355 100644
--- a/with_opencm3/flash.c
+++ b/with_opencm3/flash.c
@@ -23,20 +23,6 @@
 #include <libopencm3/stm32/flash.h>
 #include <string.h>
 
-/*
- * this is a default values of stored data
- * they could be changed by appropriate command
- * align by 2k & make size 2k for using with high density devices
- */
-#define FLASH_BLOCK_SIZE   (2048)
-#define FLASH_WRONG_DATA_WRITTEN 0x80
-/*
- .bss._flash_buffer
-                0x20001000      0x800 mk/flash.o
-                0x20001000                _flash_buffer
-*/
-
-//const uint8_t _flash_buffer[FLASH_BLOCK_SIZE] __attribute__ ((aligned(FLASH_BLOCK_SIZE)));
 const flash_data Stored_Data __attribute__ ((aligned(FLASH_BLOCK_SIZE))) = {
 	//.magick = FLASH_MAGICK,
 	._ADC_multipliers = {100000,100000,100000,100000,100000,100000,100000,100000, // TRD
@@ -49,25 +35,6 @@ const flash_data Stored_Data __attribute__ ((aligned(FLASH_BLOCK_SIZE))) = {
 	}
 };
 
-/**
- *  these are default values
- * they can be changed in runtime to change data stored in flash
- *
-flash_data Default_stored_data = {
-	.magick = FLASH_MAGICK,
-	._ADC_multipliers = {100000,100000,100000,100000,100000,100000,100000,100000, // TRD
-		26, // shutter
-		2   // power
-	},
-	._ADC_divisors = {1,1,1,1,1,1,1,1, // TRD
-		25, // shutter
-		7   // power
-	}
-};
-
-*/
-//flash_data *Stored_Data = (flash_data*) _flash_buffer;
-
 uint32_t flash_write_data(uint32_t *dataptr, uint16_t datalen){
 	uint32_t start_address = (uint32_t)&Stored_Data;
 	uint16_t i, rem;
diff --git a/with_opencm3/flash.h b/with_opencm3/flash.h
index d6b9874..8e23186 100644
--- a/with_opencm3/flash.h
+++ b/with_opencm3/flash.h
@@ -26,6 +26,14 @@
 #include "main.h"
 #include "user_proto.h"
 
+/*
+ * this is a default values of stored data
+ * they could be changed by appropriate command
+ * align by 2k & make size 2k for using with high density devices
+ */
+#define FLASH_BLOCK_SIZE   (2048)
+#define FLASH_WRONG_DATA_WRITTEN 0x80
+
 #define FLASH_MAGICK ((uint32_t) 0xAA55A55A)
 
 typedef struct{
@@ -33,8 +41,8 @@ typedef struct{
 	// A-D value[x] = ADU * ADC_multipliers[x] / ADC_divisors[x]
 	uint32_t _ADC_multipliers[ADC_CHANNELS_NUMBER];
 	uint32_t _ADC_divisors[ADC_CHANNELS_NUMBER];
-	char last_addr[0];
-	char struct_end[0] __attribute__ ((aligned(2048)));
+	char last_addr[0]; // we need this pointer to calculate real size of structure
+	char struct_end[0] __attribute__ ((aligned(FLASH_BLOCK_SIZE))); // this pointer provides size of structure multiple of page size
 } flash_data;
 
 extern const flash_data Stored_Data;
diff --git a/with_opencm3/hardware_ini.c b/with_opencm3/hardware_ini.c
index 38bb4af..8f2df8c 100644
--- a/with_opencm3/hardware_ini.c
+++ b/with_opencm3/hardware_ini.c
@@ -117,9 +117,6 @@ void SPI2_init(){
  * GPIO initialisaion: clocking + pins setup
  */
 void GPIO_init(){
-/*	rcc_periph_clock_enable(RCC_AFIO);
-	rcc_periph_clock_enable(RCC_SPI1);
-	rcc_periph_clock_enable(RCC_GPIOC);*/
 	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN |
 			RCC_APB2ENR_IOPBEN | RCC_APB2ENR_IOPCEN | RCC_APB2ENR_IOPDEN |
 			RCC_APB2ENR_IOPEEN);
@@ -133,6 +130,18 @@ void GPIO_init(){
 	gpio_set_mode(ADC_ADDR_PORT, GPIO_MODE_OUTPUT_2_MHZ,
 				GPIO_CNF_OUTPUT_PUSHPULL, ADC_ADDR_MASK | ADC_EN_PIN); // ADDRESS: PD10..12; EN: PD13
 	gpio_clear(ADC_ADDR_PORT, ADC_ADDR_MASK | ADC_EN_PIN); // clear address & turn switch off
+	// LED status: opendrain
+	gpio_set_mode(LED_STATUS_PORT, GPIO_MODE_OUTPUT_2_MHZ,
+				GPIO_CNF_OUTPUT_OPENDRAIN, LED_STATUS_PIN);
+	LED_STATUS_BAD(); // turn LED off
+	// Shutter control: input pull up
+	gpio_set_mode(SHUTTER_EXT_PORT, GPIO_MODE_INPUT,
+				GPIO_CNF_INPUT_PULL_UPDOWN, SHUTTER_CAM_PIN | SHUTTER_MAN_PIN | SHUTTER_FBSW_PIN);
+	gpio_set(SHUTTER_EXT_PORT, SHUTTER_CAM_PIN | SHUTTER_MAN_PIN | SHUTTER_FBSW_PIN); // turn on pull up
+	// shutter status LED: opendrain
+	gpio_set_mode(LED_SHUTTER_PORT, GPIO_MODE_OUTPUT_2_MHZ,
+				GPIO_CNF_OUTPUT_OPENDRAIN, LED_SHUTTER_PIN);
+	LED_SHUTTER_CLOSE(); // turn it off
 }
 
 /*
@@ -299,8 +308,10 @@ uint8_t OW_add_read_seq(uint8_t Nbytes){
 		if(tum2buff_ctr == TIM2_DMABUFF_SIZE) return 0;
 	}
 #ifdef EBUG
-	print_int(tum2buff_ctr, lastsendfun);
-	MSG(" bytes in send buffer\n");
+	if(mode == BYTE_MODE){
+		print_int(tum2buff_ctr, lastsendfun);
+		P(" bytes in send buffer\n", lastsendfun);
+	}
 #endif
 	return 1;
 }
@@ -319,16 +330,16 @@ void read_from_OWbuf(_U_ uint8_t start_idx, _U_ uint8_t N, _U_ uint8_t *outbuf){
 		for(j = 0; j < 8; j++){
 			byte >>= 1;
 #ifdef EBUG
-			print_int(tim2_inbuff[i], lastsendfun);
-			MSG(" ");
+			if(mode == BYTE_MODE){
+				print_int(tim2_inbuff[i], lastsendfun);
+				lastsendfun(' ');
+			}
 #endif
 			if(tim2_inbuff[i++] < OW_READ1)
 				byte |= 0x80;
 		}
 		*outbuf++ = byte;
-#ifdef EBUG
-		MSG("readed \n");
-#endif
+		DBG("readed \n");
 	}
 }
 // there's a mistake in opencm3, so redefine this if needed (TIM_CCMR2_CC3S_IN_TI1 -> TIM_CCMR2_CC3S_IN_TI4)
@@ -345,6 +356,7 @@ void init_ow_dmatimer(){ // tim2_ch4 - PA3, no remap
 	// 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_OPM | TIM_CR1_UDIS); // continuous mode & enable update events
 	TIM2_CR1 |= TIM_CR1_ARPE; // changing period immediately
@@ -474,7 +486,7 @@ void dma1_channel7_isr(){
 		//TIM2_DIER &= ~TIM_DIER_CC4DE;
 	}else if(DMA1_ISR & DMA_ISR_TEIF7){
 		DMA1_IFCR = DMA_IFCR_CTEIF7;
-		MSG("DMA out transfer error\n");
+		DBG("DMA out transfer error\n");
 	}
 }
 
@@ -494,7 +506,7 @@ void dma1_channel1_isr(){
 		MSG("\n");*/
 	}else if(DMA1_ISR & DMA_ISR_TEIF1){
 		DMA1_IFCR = DMA_IFCR_CTEIF1;
-		MSG("DMA in transfer error\n");
+		DBG("DMA in transfer error\n");
 	}
 }
 
diff --git a/with_opencm3/hardware_ini.h b/with_opencm3/hardware_ini.h
index cea53de..9d9c42a 100644
--- a/with_opencm3/hardware_ini.h
+++ b/with_opencm3/hardware_ini.h
@@ -23,13 +23,14 @@
 #ifndef __HARDWARE_INI_H__
 #define __HARDWARE_INI_H__
 
+
+// to have a compatibility with medium-density devices we can use only timers 1..4!!!
 /*
  * Timers:
  * SysTick - system time
  * TIM1 - not used
  * TIM2 - 1-wire
  * TIM3, TIM4 - stepper motors
- * TIM5 - pause for shutter
  */
 
 
@@ -109,10 +110,32 @@ void ADC_calibrate_and_start();
 /*
  * Shutter defines
  */
-// We use timer 5 to process pauses with shutter
-#define Shutter_tim_isr   tim5_isr
-#define SHUTTER_TIM       TIM5
-#define NVIC_SHUTTER_IRQ  NVIC_TIM5_IRQ
+// external signals for shutter opening: PB3 (SPI1_SCK) - from camera electronics, PB4 (SPI1_MISO) - from manual switch
+// both are pull-up inputs
+#define SHUTTER_EXT_PORT	(GPIOB)
+#define SHUTTER_CAM_PIN		(GPIO3)
+#define SHUTTER_MAN_PIN		(GPIO4)
+// shutter feedback ==0 when opened, PB5 (SPI1_MOSI)
+#define SHUTTER_FBSW_PIN	(GPIO5)
+// LED status open-drain output: PB8 (CAN RX)
+#define LED_STATUS_PORT		(GPIOB)
+#define LED_STATUS_PIN		(GPIO8)
+#define LED_STATUS_OK()		do{gpio_clear(LED_STATUS_PORT, LED_STATUS_PIN);}while(0)
+#define LED_STATUS_BAD()	do{gpio_set(LED_STATUS_PORT, LED_STATUS_PIN);}while(0)
+// Shutter LED (lights when shutter opened) open-drain output, PB9 (CAN TX)
+#define LED_SHUTTER_PORT	(GPIOB)
+#define LED_SHUTTER_PIN		(GPIO9)
+#define LED_SHUTTER_OPEN()	do{gpio_clear(LED_SHUTTER_PORT, LED_SHUTTER_PIN);}while(0)
+#define LED_SHUTTER_CLOSE()	do{gpio_set(LED_SHUTTER_PORT, LED_SHUTTER_PIN);}while(0)
+
+/*
+// We use timer 1 to process pauses with shutter
+#define Shutter_tim_isr        tim1_isr
+#define SHUTTER_TIM            TIM1
+//#define NVIC_SHUTTER_IRQ       NVIC_TIM5_IRQ
+#define NVIC_SHUTTER_IRQ       NVIC_TIM1_UP_IRQ
+#define RCC_SHUTTER_TIM        RCC_TIM1
+*/
 // Shutter pins: PC0 & PC2 are polarity & on/off pins; PC1 is feedback pin
 #define SHUTTER_PORT           (GPIOC)
 #define SHUTTER_ON_PIN         (GPIO2)
diff --git a/with_opencm3/ircontroller.bin b/with_opencm3/ircontroller.bin
index 8123110..9986659 100755
Binary files a/with_opencm3/ircontroller.bin and b/with_opencm3/ircontroller.bin differ
diff --git a/with_opencm3/main.c b/with_opencm3/main.c
index 35186b4..843cbfd 100644
--- a/with_opencm3/main.c
+++ b/with_opencm3/main.c
@@ -115,7 +115,7 @@ void AD7794_init(){
 	if(i != ADC_NO_ERROR){
 		if(i == ADC_ERR_NO_DEVICE){
 		//	print_int(curSPI, lastsendfun);
-			MSG("ADC signal is absent! Check connection.\n");
+			MSG("ADC signal is absent! Check connection.\n", "[ " STR_EXTADC_INIT " ERR ]\n");
 		/*	if(curSPI == 1){
 				curSPI = 2;
 				switch_SPI(SPI2);
@@ -127,7 +127,7 @@ void AD7794_init(){
 	}else{
 		if(!setup_AD7794(INTREFIN | REF_DETECTION | UNIPOLAR_CODING, IEXC_DIRECT  | IEXC_1MA)
 			|| !AD7794_calibration(0)){
-			MSG("Error: can't initialize AD7794!\n");
+			MSG("Error: can't initialize AD7794!\n", "[ " STR_EXTADC_INIT " ERR ]\n");
 		}else{
 			ad7794_on = 1;
 			DBG("ADC ready\n");
@@ -136,8 +136,9 @@ void AD7794_init(){
 }
 
 int main(){
-	int i;
+	//int i;
 	uint32_t Old_timer = 0, lastTRDread = 0, lastTmon = 0;
+	int oldusbdatalen = 0;
 	//SPI_read_status SPI_stat;
 
 	// RCC clocking: 8MHz oscillator -> 72MHz system
@@ -158,10 +159,9 @@ int main(){
 	// SysTick is a system timer with 1mc period
 	SysTick_init();
 
-//	switch_SPI(SPI2); // init SPI2
-//	SPI_init();
-
-	switch_SPI(SPI1); // init SPI1
+	// instead of SPI1 we use those pins to control shutter and system state
+	// SPI2 used for working with external ADC
+	switch_SPI(SPI2); // init SPI2
 	SPI_init();
 	init_ow_dmatimer();
 
@@ -175,11 +175,13 @@ int main(){
 
 	usb_connect(); // turn on USB
 	shutter_init();
+
+	LED_STATUS_OK(); // All initialized - light up LED
 	while(1){
 		usbd_poll(usbd_dev);
-		if(usbdatalen){ // there's something in USB buffer
-			parce_incoming_buf(usbdatabuf, usbdatalen, usb_send);
-			usbdatalen = 0; // all data have been processed - prepare to get new portion
+		if(oldusbdatalen != usbdatalen){ // there's something in USB buffer
+			usbdatalen = parce_incoming_buf(usbdatabuf, usbdatalen, usb_send);
+			oldusbdatalen = usbdatalen;
 		}
 		check_and_parce_UART(USART1); // also check data in UART buffers
 		if(ad7794_on){
@@ -216,11 +218,7 @@ int main(){
 			lastTmon += 10000;
 			if(ADC_monitoring){
 				print_time(lastsendfun);
-				lastsendfun(' ');
-				for(i = 0; i < 8; i++){
-					print_int(TRD_value(i), lastsendfun);
-					lastsendfun(' ');
-				}
+				print_int_ad_vals(lastsendfun);
 				print_ad_vals(lastsendfun);
 			}
 		}
@@ -248,7 +246,10 @@ void Delay(uint16_t _U_ time){
  * with ' ' as delimeter
  */
 void print_time(sendfun s){
+	if(mode == LINE_MODE) P("[ " STR_PRINT_TIME " ", s);
 	print_int(tOVRFL, s);
 	s(' ');
 	print_int(Timer, s);
+	if(mode == LINE_MODE) P(" ]\n", s);
+	else if(mode == BYTE_MODE) s(' ');
 }
diff --git a/with_opencm3/onewire.c b/with_opencm3/onewire.c
index 1add12b..bb46cef 100644
--- a/with_opencm3/onewire.c
+++ b/with_opencm3/onewire.c
@@ -17,6 +17,7 @@
  * 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
@@ -70,7 +71,7 @@ void OW_process(){
 			if(!OW_READY()) return; // reset in work
 			if(ow_was_reseting){
 				if(!OW_get_reset_status()){
-					MSG("error: no 1-wire devices found\n");
+					BYTE_MSG("error: no 1-wire devices found\n");
 					ow_was_reseting = 0;
 				//	OW_State = OW_OFF_STATE;
 				//	return;
@@ -100,7 +101,7 @@ void OW_process(){
 //uint8_t comtosend = 0;
 void OW_fill_ID(uint8_t N){
 	if(N >= OW_MAX_NUM){
-		MSG("number too big\n");
+		BYTE_MSG("number too big\n");
 		return;
 	}
 	//OW_Send(1, (uint8_t*)"\xcc\x33", 2);
diff --git a/with_opencm3/powerhw.c b/with_opencm3/powerhw.c
index 1bc867e..7029b1c 100644
--- a/with_opencm3/powerhw.c
+++ b/with_opencm3/powerhw.c
@@ -23,16 +23,24 @@
 // state of shutter - global variable to omit interface functions
 shutter_state Shutter_State = SHUTTER_NOTREADY;
 uint16_t Shutter_delay = SHUTTER_DELAY;
+int8_t manual_pin_old_state = -1;
+int8_t camera_pin_old_state = -1;
+uint8_t changed_manually = 0; // ==1 if shutter state was changed by manual switch
 
 // function to be runned from timer irq
-void (*shutter_timer_fn)() = NULL;
+//void (*shutter_timer_fn)() = NULL;
+
+#define    DWT_CYCCNT    *(volatile uint32_t *)0xE0001004
+#define    DWT_CONTROL   *(volatile uint32_t *)0xE0001000
+#define    SCB_DEMCR     *(volatile uint32_t *)0xE000EDFC
 
 /**
  * Make background pause in 'us' microsecond, after which run function fn_ready
  * @param us       - pause in microseconds
  * @param fn_ready - function to run at end of pause
  */
-void shutter_wait(int us, void(*fn_ready)()){
+void shutter_wait(uint32_t us, void(*fn_ready)()){
+	/*
 	if(!fn_ready) return;
 	//DBG("wait for previous .. ");
 	while(shutter_timer_fn); // wait for ending of previous operation
@@ -40,12 +48,23 @@ void shutter_wait(int us, void(*fn_ready)()){
 	shutter_timer_fn = fn_ready;
 	timer_set_period(SHUTTER_TIM, us);
 	timer_enable_counter(SHUTTER_TIM);
+	*/
+	if(!fn_ready) return;
+	//int i;
+	us *= 72;
+	// wait for us*72 cycles
+	SCB_DEMCR  |= 0x01000000;
+	DWT_CYCCNT  = 0;
+	DWT_CONTROL|= 1; // enable the counter
+//	for (i = 0; i < us; i++) __asm__("nop");
+	while(DWT_CYCCNT < us);
+	fn_ready();
 }
 
 // macro to open/close/set default state
 // open shutter is 0:0 -> when MCU power is off, shutter "automatically" opens
-#define shutter_open()  do{gpio_clear(SHUTTER_PORT, SHUTTER_ON_PIN | SHUTTER_POLARITY_PIN);}while(0)
-#define shutter_close() do{gpio_clear(SHUTTER_PORT, SHUTTER_ON_PIN);  \
+#define shutter_close()  do{gpio_clear(SHUTTER_PORT, SHUTTER_ON_PIN | SHUTTER_POLARITY_PIN);}while(0)
+#define shutter_open() do{gpio_clear(SHUTTER_PORT, SHUTTER_ON_PIN);  \
 		gpio_set(SHUTTER_PORT, SHUTTER_POLARITY_PIN);}while(0)
 #define shutter_hiZ() do{gpio_set(SHUTTER_PORT, SHUTTER_ON_PIN | SHUTTER_POLARITY_PIN);}while(0)
 #define shutter_off() do{gpio_set(SHUTTER_PORT, SHUTTER_ON_PIN); \
@@ -60,6 +79,7 @@ void shutter_wait(int us, void(*fn_ready)()){
  * if shutter was uninitialized we open it
  */
 void shutter_test(){
+	//DBG("shutter test\n");
 	static shutter_state old_State = SHUTTER_NOTREADY;
 	// test for undervoltage
 	if(shutter_voltage() < SHUTTER_UNDERVOLTAGE_THRES){
@@ -81,7 +101,7 @@ void shutter_test(){
 			Shutter_State = SHUTTER_NOTREADY;
 		}else{
 			if(old_State == SHUTTER_NOTREADY){
-				Shutter_State = SHUTTER_OPENING;
+				Shutter_State = SHUTTER_CLOSING; // close shutter on power on
 				DBG("ready!\n");
 			}else{
 				Shutter_State = old_State;
@@ -95,6 +115,7 @@ void shutter_test(){
 
 /**
  * after open/close pulse we should return bridge to default state
+ * If shutter opened/closed by manual switch we don't need to check EP (reed)
  * 3 stages:
  *    1) check for short-circuit & turn off power of the shutter
  *    2) check for overtemperature or undervoltage
@@ -103,12 +124,26 @@ void shutter_test(){
 void shutter_ready(){
 	uint8_t test_err = 0;
 	//DBG("shtr ready\n");
+	uint32_t shtr_status = gpio_get(SHUTTER_EXT_PORT, SHUTTER_FBSW_PIN); // 0 when opened
 	switch (Shutter_State){
 		case SHUTTER_CLOSED: // repeated pulse to check errors
+			if(shtr_status)
+				LED_SHUTTER_CLOSE(); // turn off shutter status LED
+			else{
+				ERR("shutter is still opened\n");
+				if(!changed_manually) Shutter_State = SHUTTER_NOTREADY;
+			}
 		case SHUTTER_OPENED:
 			if(shutter_error()){
 				ERR("shutter overtemperature or undervoltage\n");
 				Shutter_State = SHUTTER_NOTREADY;
+			}else{
+				if(shtr_status == 0)
+					LED_SHUTTER_OPEN(); // turn on LED
+				else{
+					ERR("shutter is still closed\n");
+					if(!changed_manually) Shutter_State = SHUTTER_NOTREADY;
+				}
 			}
 		break;
 		case SHUTTER_PROC_CLOSING: // closing - set to closed state
@@ -128,6 +163,7 @@ void shutter_ready(){
 			ERR("wrong shutter state\n");
 			print_shutter_state(lastsendfun);
 	}
+	changed_manually = 0;
 	shutter_off();
 	if(Shutter_State == SHUTTER_NOTREADY) return;
 	if(test_err){
@@ -145,9 +181,11 @@ void shutter_ready(){
  */
 shutter_state shutter_init(){
 	Shutter_State = SHUTTER_NOTREADY;
+	/*
 	// setup timer
-	rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_TIM5EN);// enable timer clocking
-	nvic_enable_irq(NVIC_SHUTTER_IRQ);
+	rcc_periph_clock_enable(RCC_SHUTTER_TIM);
+	//rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_TIM5EN);
+	//rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_TIM1EN);
 	timer_reset(SHUTTER_TIM);
 	// timer have frequency of 1MHz, so, to make pause in Xus set period to X
 	// 36MHz of APB1
@@ -158,16 +196,21 @@ shutter_state shutter_init(){
 	timer_disable_preload(SHUTTER_TIM); // force changing period
 	timer_update_on_overflow(SHUTTER_TIM); // generate UEV only on overflow
 	timer_enable_update_event(SHUTTER_TIM);
+	nvic_enable_irq(NVIC_SHUTTER_IRQ);
 	timer_enable_irq(SHUTTER_TIM, TIM_DIER_UIE); // update IRQ enable
+	*/
 	//DBG("shutter timer ready\n");
 	// setup pins
 	// on/off & polarity: open drain
 	gpio_set_mode(SHUTTER_PORT, GPIO_MODE_OUTPUT_2_MHZ,
 				GPIO_CNF_OUTPUT_OPENDRAIN, SHUTTER_ON_PIN | SHUTTER_POLARITY_PIN);
+	//DBG("shutter on&polarity ready\n");
 	// feedback: floating input
 	gpio_set_mode(SHUTTER_PORT, GPIO_MODE_INPUT,
 				GPIO_CNF_INPUT_FLOAT, SHUTTER_FB_PIN);
+	//DBG("shutter fb ready\n");
 	shutter_off();
+	//shutter_timer_fn = NULL;
 	shutter_wait(SHUTTER_OP_DELAY, shutter_test);
 	return SHUTTER_INITIALIZED; // we return this state in spite of the shutter isn't really initialized yet
 }
@@ -177,8 +220,47 @@ shutter_state shutter_init(){
  * (wait for capasitor charge and run needed functions
  */
 void process_shutter(){
+	uint8_t man_pin_state, cam_pin_state, ext_open = 0, ext_close = 0;
 	if(Shutter_State == SHUTTER_NOTREADY) return;
 
+	// test state of external control pins
+	cam_pin_state = (gpio_get(SHUTTER_EXT_PORT, SHUTTER_CAM_PIN)) ? 1 : 0;
+	if(camera_pin_old_state != cam_pin_state){ // camera signal changed or initialisation
+		camera_pin_old_state = cam_pin_state;
+		if(cam_pin_state){ // close
+			ext_close = 1;
+		}else{ // open
+			ext_open = 1;
+		}
+	}
+	man_pin_state = (gpio_get(SHUTTER_EXT_PORT, SHUTTER_MAN_PIN)) ? 1 : 0;
+	// to avoid opening shutter if user forget to set manual switch to "closed" position
+	// all operations with manual switch processed only in changing state of the switch
+	if(manual_pin_old_state == -1){ // refresh manual pin state
+		manual_pin_old_state = man_pin_state;
+	}else if(manual_pin_old_state != man_pin_state){ // user changed switch state -> open/close
+		manual_pin_old_state = man_pin_state;
+		changed_manually = 1;
+		if(man_pin_state){ // close
+			ext_close = 1;
+		}else{ // open
+			ext_open = 1;
+		}
+	}
+
+	// "open" signal have highest priority
+	if(ext_open){ // external signal for opening shutter
+		if(Shutter_State != SHUTTER_OPENED && Shutter_State != SHUTTER_PROC_OPENING)
+			Shutter_State = SHUTTER_OPENING;
+		else
+			changed_manually = 0;
+	}else if(ext_close){ // close shutter
+		if(Shutter_State != SHUTTER_CLOSED && Shutter_State != SHUTTER_PROC_CLOSING)
+			Shutter_State = SHUTTER_CLOSING;
+		else
+			changed_manually = 0;
+	}
+
 	if(Shutter_State != SHUTTER_OPENING && Shutter_State != SHUTTER_CLOSING)
 		return;
 	if(shutter_voltage() < SHUTTER_UNDERVOLTAGE_THRES){
@@ -209,8 +291,9 @@ void process_shutter(){
 	shutter_wait(Shutter_delay, shutter_ready);
 }
 
+/*
 void Shutter_tim_isr(){
-	//DBG("shutter timer\n");
+	DBG("shutter timer\n");
 	void (*fn)() = shutter_timer_fn;
 	if(timer_get_flag(SHUTTER_TIM, TIM_SR_UIF)){
 		// Clear compare interrupt flag
@@ -222,12 +305,14 @@ void Shutter_tim_isr(){
 		}
 	}
 }
+*/
 
 /**
  * printout shutter state
  */
 void print_shutter_state(sendfun s){
-	P("shutter ", s);
+	if(mode == BYTE_MODE) P("shutter ", s);
+	else if(mode == LINE_MODE) P("[ " STR_SHTR_STATE " ", s);
 	switch (Shutter_State){
 		case SHUTTER_INITIALIZED:
 			P("testing", s);
@@ -257,35 +342,43 @@ void print_shutter_state(sendfun s){
 			}else
 				P("not initialised or broken", s);
 	}
-	newline(s);
+	P(" (reed ", s);
+	if(gpio_get(SHUTTER_EXT_PORT, SHUTTER_FBSW_PIN)){ // closed
+		P("closed", s);
+	}else{//opened
+		P("opened", s);
+	}
+	if(mode == BYTE_MODE) P(")\n", s);
+	else if(mode == LINE_MODE) P(") ]\n", s);
 }
 
 /**
  * Try to open/close shutter depending on argument:
  * 		state == SHUTTER_CLOSING - try to close
  * 		state == SHUTTER_OPENING - try to open
+ * return 1 if state was changed
  */
-void shutter_try(shutter_state state){
+uint8_t shutter_try(shutter_state state){
+	uint8_t changestate = 0;
 	switch (Shutter_State){ // right states are only OPENED, CLOSED & READY
 		case SHUTTER_OPENED:
 			if(state == SHUTTER_OPENING){ // try to open opened shutter?
-				P("alerady opened\n", lastsendfun);
-				return;
-			}
+				BYTE_MSG("alerady opened\n");
+			}else changestate = 1;
 		break;
 		case SHUTTER_CLOSED:
 			if(state == SHUTTER_CLOSING){ // try to close closed?
-				P("alerady closed\n", lastsendfun);
-				return;
-			}
+				BYTE_MSG("alerady closed\n");
+			}else changestate = 1;
 		break;
 		case SHUTTER_READY:
-			; // All OK
+			changestate = 1; // All OK - change state
 		break;
-		default:
-			print_shutter_state(lastsendfun);
-			return;
+		default: break;
 	}
-	Shutter_State = state; // all OK, now we can change current state of shutter
+	if(mode == BYTE_MODE) print_shutter_state(lastsendfun);
+	if(changestate)
+		Shutter_State = state; // all OK, now we can change current state of shutter
+	return changestate;
 }
 
diff --git a/with_opencm3/powerhw.h b/with_opencm3/powerhw.h
index 3c638e5..1716ae2 100644
--- a/with_opencm3/powerhw.h
+++ b/with_opencm3/powerhw.h
@@ -45,7 +45,7 @@ shutter_state shutter_init();
 void process_shutter();
 void print_shutter_state(sendfun s);
 
-void shutter_try(shutter_state state);
+uint8_t shutter_try(shutter_state state);
 
 #define try_to_close_shutter()   shutter_try(SHUTTER_CLOSING)
 #define try_to_open_shutter()    shutter_try(SHUTTER_OPENING)
diff --git a/with_opencm3/stepper_motors.c b/with_opencm3/stepper_motors.c
index e5f922c..faf7785 100644
--- a/with_opencm3/stepper_motors.c
+++ b/with_opencm3/stepper_motors.c
@@ -29,6 +29,8 @@ uint32_t Turrets_pause = 2 * TURRETS_PAUSE_US / 1300; // pause in half-steps
 volatile uint8_t timer_flag[2] = {0,0};
 // amount of steps for each motor
 volatile uint32_t Motor_steps[5] = {0, 0, 0, 0, 0};
+// absolute value of current position, usefull for stages
+volatile int32_t Motor_abs_steps[5] = {0, 0, 0, 0, 0};
 // flag of active motor
 volatile uint8_t Motor_active[5] = {0, 0, 0, 0, 0};
 /*
@@ -40,6 +42,10 @@ uint8_t waits[5] = {0,0,0,0,0};
 uint8_t lastpos[5] = {0,0,0,0,0};
 // number of position to move turret or stage, zero to move only for N given steps
 uint8_t move2pos[5] = {0,0,0,0,0};
+// number of positions passed for given
+uint8_t positions_pass[3] = {0,0,0};
+// maximum amount of positions passed to reach given
+#define MAX_POSITIONS_PASS    (8)
 
 /**
  * Setup stepper motors' timer Tim
@@ -64,7 +70,7 @@ static void setup_timer(uint8_t N){
 	// 36MHz of APB1
 	timer_set_mode(Tim, TIM_CR1_CKD_CK_INT, TIM_CR1_CMS_EDGE, TIM_CR1_DIR_UP);
 	// 72MHz div 36 = 2MHz
-	timer_set_prescaler(Tim, 35); // prescaler is (div - 1)
+	timer_set_prescaler(Tim, 35); // prescaler is (div - 1), 2pulse == 1 step
 	timer_continuous_mode(Tim); // automatically reload
 	timer_disable_preload(Tim); // force changing period
 	timer_set_period(Tim, Motor_period[N] - 1);
@@ -73,8 +79,10 @@ static void setup_timer(uint8_t N){
 	timer_enable_counter(Tim);
 	timers_activated[N] = 1;
 #ifdef EBUG
-	lastsendfun('3' + N);
-	MSG(" timer\n");
+	if(mode == BYTE_MODE){
+		lastsendfun('3' + N);
+		P(" timer\n", lastsendfun);
+	}
 #endif
 }
 
@@ -123,7 +131,7 @@ uint8_t test_stages_endpos(uint8_t num, uint8_t curpos){
 	const uint8_t stage_minus[2] = {STAGE_CHECK(3, MINUS), STAGE_CHECK(4, MINUS)};
 	uint8_t negative_dir = 0;
 	num -= 3; // convern num to index in arrays
-	if((uint16_t)GPIO_IDR(MOTOR_EN_PORT) & MOTOR_EN_PIN(num)){ // negative direction
+	if((uint16_t)(GPIO_IDR(MOTOR_DIR_PORT) & MOTOR_DIR_PIN(num))){ // negative direction
 		negative_dir = 1;
 	}
 	if(stage_plus[num] == curpos){ // we are on "+" end-switch
@@ -138,8 +146,10 @@ uint8_t test_stages_endpos(uint8_t num, uint8_t curpos){
 		}
 	}else{ // error: WTF is going up? curpos != 2 or 1
 		ERR("Wrong current position: ");
-		print_int(curpos, lastsendfun);
-		lastsendfun('\n');
+		if(mode == BYTE_MODE){
+			print_int(curpos, lastsendfun);
+			lastsendfun('\n');
+		}
 		return 1;
 	}
 	return 0;
@@ -172,22 +182,26 @@ uint8_t check_ep(uint8_t num){
 
 /**
  * Move motor Motor_number to User_value steps
+ * return 0 if motor is still moving
  */
-void move_motor(uint8_t num, int32_t steps){
+uint8_t move_motor(uint8_t num, int32_t steps){
 	uint8_t curpos, negative_dir = 0;
-	if(steps == 0) return;
+	if(steps == 0) return 0;
 	// check whether motor is moving
 	if(Motor_active[num]){
 		ERR("moving\n");
-		return;
+		return 0;
 	}
 #ifdef EBUG
-	MSG("move ");
-	lastsendfun('0' + num);
-	MSG(" to ");
-	print_int(steps, lastsendfun);
-	MSG("\n");
+	if(mode == BYTE_MODE){
+		P("move ", lastsendfun);
+		lastsendfun('0' + num);
+		P(" to ", lastsendfun);
+		print_int(steps, lastsendfun);
+		lastsendfun('\n');
+	}
 #endif
+	Motor_abs_steps[num] += steps; // fix absolute position
 	if(steps < 0){
 		negative_dir = 1;
 		steps = -steps;
@@ -199,29 +213,60 @@ void move_motor(uint8_t num, int32_t steps){
 	}else{
 		gpio_clear(MOTOR_DIR_PORT, MOTOR_DIR_PIN(num)); // reset DIR bit
 	}
-	if(test_stages_endpos(num, curpos)) return; // error: we can't move
+	if(test_stages_endpos(num, curpos)){ // error: we can't move
+		stop_motor(num); // say about it
+		return 0;
+	}
 	// set all flags and variables
 	Motor_steps[num] = steps; // we run in full-step mode!
 	waits[num] = 0;
 	Motor_active[num] = 1;
+	if(num < 3) // this is turret -> reset counter of passed positions
+		positions_pass[num] = 0;
 	gpio_set(MOTOR_EN_PORT, MOTOR_EN_PIN(num));
+	return 1;
 }
 
+
 void stop_motor(uint8_t num){
-	if(!Motor_active[num]) return;
-#ifdef EBUG
-	MSG("stop motor ");
-	lastsendfun('0' + num);
-	MSG("\n");
-#endif
-	gpio_clear(MOTOR_EN_PORT, MOTOR_EN_PIN(num));
-	Motor_active[num] = 0;
+	const uint8_t stage_minus[2] = {STAGE_CHECK(3, MINUS), STAGE_CHECK(4, MINUS)};
+	//if(!) return;
+	MSG("stop motor ", "[ " STR_STOP_ALL_MOTORS " ");
+	if(mode != BINARY_MODE) lastsendfun('0' + num);
+	if(Motor_active[num]){
+		if(!gpio_get(MOTOR_EN_PORT, MOTOR_EN_PIN(num)) && mode == LINE_MODE)
+			P(" HEAT ", lastsendfun);
+		gpio_clear(MOTOR_EN_PORT, MOTOR_EN_PIN(num));
+		Motor_active[num] = 0;
+	}
+	uint8_t curpos = check_ep(num);
+	// set absolute counter to zero on 1st position for turrets or on MINUS EP for stages
 	if(num < 3){ // this is a turret
 		move2pos[num] = 0; // reset target position value
-		if(check_ep(num) == 0){ // a turret is out of fixed position
-			ERR("stop out of position\n");
+		if(curpos == 1){
+			Motor_abs_steps[num] = 0;
+			goto retn;
+		}else{
+			if(curpos == 0) // a turret is out of fixed position
+				MSG(" stop out of position", "ERR ");
+		}
+	}else{ // linear stage
+		if(curpos == stage_minus[num-3]){
+			Motor_abs_steps[num] = 0;
+			goto retn;
 		}
 	}
+	int32_t sign = 1;
+	if(GPIO_IDR(MOTOR_DIR_PORT) & MOTOR_DIR_PIN(num)){ // negative direction
+		sign = -1;
+	}
+	Motor_abs_steps[num] -= Motor_steps[num] * sign;
+	Motor_steps[num] = 0;
+retn:
+	BYTE_MSG(" absolute steps: ");
+	print_int(Motor_abs_steps[num], lastsendfun);
+	if(mode == LINE_MODE) P(" ]", lastsendfun);
+	lastsendfun('\n');
 }
 
 
@@ -262,8 +307,11 @@ void process_stepper_motors(){
 						if(waits[i]) continue; // there's more half-steps to skip
 						lastpos[i] = curpos;
 						// tell user current position
-						MSG("position: ");
+						MSG("position of motor ", "[ " STR_ENDSW_STATE " ");
+						print_int(i, lastsendfun);
+						lastsendfun(' ');
 						print_int(curpos, lastsendfun);
+						if(mode == LINE_MODE) P(" ]", lastsendfun);
 						lastsendfun('\n');
 						// turn on motor after pause
 						gpio_set(MOTOR_EN_PORT, MOTOR_EN_PIN(i));
@@ -276,7 +324,11 @@ void process_stepper_motors(){
 								if(curpos == move2pos[i]){ // we are on position
 									stop_motor(i);
 								}else{ // add some steps to move to next position
-									Motor_steps[i] += TURRETS_NEXT_POS_STEPS;
+									if(++positions_pass[i] > MAX_POSITIONS_PASS){
+										ERR("Can't reach given position");
+										stop_motor(i);
+									}else
+										Motor_steps[i] += TURRETS_NEXT_POS_STEPS;
 								}
 							}
 						}
@@ -340,7 +392,7 @@ void set_motor_period(uint8_t num, uint16_t period){
 			N = 1;
 		break;
 		default:
-			MSG("err: bad motor");
+			ERR("bad motor");
 			return;
 	}
 	if(period == 0) Motor_period[N] = 1;
diff --git a/with_opencm3/stepper_motors.h b/with_opencm3/stepper_motors.h
index 9e730e7..135795d 100644
--- a/with_opencm3/stepper_motors.h
+++ b/with_opencm3/stepper_motors.h
@@ -54,16 +54,31 @@
 #define STAGE_CHECK(N, DIR)  CONCAT(EP ## N, DIR)
 
 // setup ports: PA8, PB6, PB7, PC7..PC9, PD0..PD7
+/*
 #define SETUP_ESW() do{gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO8); \
                        gpio_set_mode(GPIOB, GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO6|GPIO7); \
                        gpio_set_mode(GPIOC, GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, (uint16_t)0x0380);\
                        gpio_set_mode(GPIOD, GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, (uint16_t)0xff); \
                     }while(0)
+*/
+#define SETUP_ESW() do{gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, GPIO8); \
+                       gpio_set(GPIOA, GPIO8); \
+                       gpio_set_mode(GPIOB, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, GPIO6|GPIO7); \
+                       gpio_set(GPIOB, GPIO6|GPIO7); \
+                       gpio_set_mode(GPIOC, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, (uint16_t)0x0380);\
+                       gpio_set(GPIOC, (uint16_t)0x0380);\
+                       gpio_set_mode(GPIOD, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, (uint16_t)0xff); \
+                       gpio_set(GPIOD, (uint16_t)0xff); \
+                    }while(0)
+
+extern uint8_t move2pos[]; // export this array for ability of moving turret to given position from outside
 
 void steppers_init();
 void process_stepper_motors();
-void move_motor(uint8_t num, int32_t steps);
+uint8_t move_motor(uint8_t num, int32_t steps);
 void stop_motor(uint8_t num);
 void set_motor_period(uint8_t num, uint16_t period);
+uint8_t check_ep(uint8_t num);
+
 
 #endif // __STEPPER_MOTORS_H__
diff --git a/with_opencm3/uart.c b/with_opencm3/uart.c
index d324588..da5c609 100644
--- a/with_opencm3/uart.c
+++ b/with_opencm3/uart.c
@@ -268,6 +268,7 @@ UART_buff *get_uart_buffer(uint32_t UART){
  */
 void check_and_parce_UART(uint32_t UART){
 	sendfun sf;
+	static int oldlen = 0;
 	UART_buff *curbuff = get_uart_buffer(UART);
 	uint8_t datalen; // length of data in buffer - here we use param "end"
 	if(!curbuff) return;
@@ -286,8 +287,10 @@ void check_and_parce_UART(uint32_t UART){
 	}
 	datalen = curbuff->end;
 	if(!datalen) return; // buffer is empty
-	parce_incoming_buf((char*)curbuff->buf, datalen, sf); // process data
-	curbuff->end = 0; // and zero counter
+	if(oldlen != datalen){ // run checking buffer contents only when data size changed
+		// process data and zero counter if all OK
+		oldlen = curbuff->end = parce_incoming_buf((char*)curbuff->buf, datalen, sf);
+	}
 }
 
 /**
diff --git a/with_opencm3/user_proto.c b/with_opencm3/user_proto.c
index 54fa6d2..828a0f0 100644
--- a/with_opencm3/user_proto.c
+++ b/with_opencm3/user_proto.c
@@ -25,6 +25,8 @@
 #include "hardware_ini.h"
 #include "flash.h"
 
+// mode:
+curmode_t mode = BYTE_MODE; // text protocol, activated on 1st meeteng of '['
 // integer value given by user
 static volatile int32_t User_value = 0;
 // number of motor to process
@@ -46,38 +48,71 @@ 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)
-#define WRONG_COMMAND() do{command = '?';}while(0)
+#define WRONG_COMMAND() do{if(mode == BYTE_MODE) command = '?';}while(0)
 
 /**
- * displays all TRD values
+ * displays all TRD values from AD7794
  * @param s -- current output
  */
 void print_ad_vals(sendfun s){
 	int j;
 	if(ad7794_on){
 		for(j = 0; j < TRD_NO; j++){
+			if(mode == LINE_MODE){
+				P("[ " STR_EXTADC_VALUES " ", s);
+				print_int(j, s);
+				s(' ');
+			}
 			print_int(ad7794_values[j], s);
-			s(' ');
+			if(mode == LINE_MODE)
+				P(" ]\n", s);
+			else s(' ');
 		}
-		newline(s);
+		if(mode == BYTE_MODE) newline(s);
 	}else{
-		P("no AD7794 found\n", s);
+		if(mode == BYTE_MODE) P("no AD7794 found\n", s);
+		else if(mode == LINE_MODE) P("[ " STR_EXTADC_VALUES " ERR ]\n", s);
 	}
 }
 
-void set_shtr_delay(int32_t v, sendfun s){
+/**
+ * displays all TRD values from inner ADC
+ * @param s -- current output
+ */
+void print_int_ad_vals(sendfun s){
+	int j;
+	for(j = 0; j < 8; j++){
+		if(mode == LINE_MODE){
+			P("[ " STR_INTADC_VALUES " ", s);
+			print_int(j, s);
+			s(' ');
+		}
+		print_int(TRD_value(j), s);
+		if(mode == BYTE_MODE) s(' ');
+		else if(mode == LINE_MODE)
+			P(" ]\n", s);
+	}
+}
+
+/*
+uint8_t set_shtr_delay(int32_t v, sendfun s){
 	uint16_t d = (uint16_t) v;
 	Shutter_delay = d;
 	P("Change delay to ", s);
 	print_int(d, s);
+	return 0;
 }
-
+*/
 
 int adc_channel = -1;
 int div_mul = 0; // 0 - multip., !0 - div.
-void ch_divmul(int32_t v, sendfun s){
+/**
+ * change dividers/multipliers
+ * work only in BYTE_MODE
+ */
+uint8_t ch_divmul(int32_t v, sendfun s){
 	uint32_t val = (uint32_t) v;
-	if(adc_channel == -1) return;
+	if(adc_channel == -1) return 0;
 	if(div_mul){ // != 0 - divisors
 		flash_store_U32((uint32_t)&ADC_divisors[adc_channel], &val);
 	}else{ // == 0 - mul
@@ -85,40 +120,196 @@ void ch_divmul(int32_t v, sendfun s){
 	}
 	adc_channel = -1;
 	P("stored\n", s);
+	return 1;
 }
 /**
- * Change divisor
+ * Change divisor (work only in BYTE_MODE)
  * @param v - user value (sensor number)
  * @param s - active sendfunction
  */
-void try_ch_divmul(int32_t v, sendfun s){
+uint8_t try_ch_divmul(int32_t v, sendfun s){
 	if(v > ADC_CHANNELS_NUMBER || v < 0){
 		P("wrong channel number\n", s);
 		adc_channel = -1;
-		return; // error
+		return 0; // error
 	}
 	adc_channel = v;
 	I = ch_divmul;
 	read_int(NULL, 0); //start reading next int
+	return 0;
 }
 
-void parce_incoming_buf(char *buf, int len, sendfun s){
-	uint8_t command;
+/**
+ * prints state of end switches for motor v
+ */
+uint8_t endswitchstate(int32_t v, sendfun s){
+	int32_t i;
+	if(v < 0 || v > 4){
+		if(mode == BYTE_MODE) P("Wrong motor number\n", s);
+		return 0;
+	}
+	i = check_ep(v);
+	if(mode == BYTE_MODE){
+		P("Endswitches for motor ", s);
+		s('0' + v);
+		P(": ", s);
+	}else if(mode == LINE_MODE){ // in LINE_MODE print [ E No_motor state ]
+		P("[ " STR_ENDSW_STATE " ",s);
+		s('0' + v);
+		s(' ');
+	}
+	if(mode != BINARY_MODE){
+		print_int(i, s);
+		if(mode == LINE_MODE) P(" ]\n", s);
+		else s('\n');
+	}
+	return 0;
+}
+
+/**
+ * moves turret 'active_motor' to position v
+ */
+uint8_t move_turret(int32_t v, sendfun s){
+	const int32_t maxpos[3] = {8, 6, 6}; // maximum position number for given turret
+	int32_t sign = 1;
+	if(active_motor > 2){
+		if(mode == BYTE_MODE) P("Wrong turret number\n", s);
+		return 0;
+	}
+	int32_t m = maxpos[active_motor];
+	if(v > m){
+		if(mode == BYTE_MODE){
+			P("Wrong position, shoud be not more than ", s);
+			print_int(m, s);
+		}
+		return 0;
+	}
+	move2pos[active_motor] = v;
+	// check the nearest direction
+	uint8_t curpos = check_ep(active_motor);
+	if(curpos){ // we are not between positions
+		if((v + m - curpos) > m/2) // rotation in positive direction will take more steps than in negative
+			sign = -1; // move CCV
+	}
+	return move_motor(active_motor, TURRETS_NEXT_POS_STEPS * sign);
+}
+
+/**
+ * function 'help' works only in BYTE_MODE
+ */
+void help(sendfun s){
+	#define pr(arg)   do{prnt((uint8_t*)arg, s); s('\n');}while(0)
+	pr("0..4\t move stepper motor to N steps");
+	pr("Commands in char protocol:");
+	pr(STR_INTADC_VALUES "\tget TRD values");
+	pr(STR_STOP_ALL_MOTORS "\tstop all motors");
+	//pr("C");
+	pr("D\tturn AD7794 to double conversion mode");
+	pr(STR_ENDSW_STATE "\tshow end-switches state for given motor");
+	pr("F\tdump flash data");
+	//pr("G");
+	pr("H\tshow this help");
+	pr("I\tturn off AD7794 init flag");
+	pr("J\tmove slits (0) wheel to Nth position");
+	pr("K\tmove filters (1) wheel to Nth position");
+	pr("L\tmove filters (2) wheel to Nth position");
+	pr("M\tswitch on/off ADC monitoring");
+	//pr("N");
+	//pr("O");
+	pr("P\ttest (ow_fill_id)");
+	//pr("Q");
+	//pr("R");
+	pr("S\tturn AD7794 to single conversion mode");
+	pr(STR_PRINT_TIME "\tprint current value of time counters");
+	//pr("U\t(reserved)");
+	//pr("V");
+	//pr("W\t(reserved)");
+	pr("X\tset timer period for linear stages");
+	//pr("Y");
+	//pr("Z");
+	//pr("a");
+	//pr("b");
+	pr("c\tclose shutter");
+	pr("d\tchange value of ADC divisor No N");
+	//pr("e");
+	//pr("f");
+	pr("g\tchange AD7794 gain");
+	pr(STR_SHTR_VOLTAGE "\tshow shutter voltage");
+	pr(STR_EXTADC_INIT "\tinit AD7794");
+	//pr("j");
+	//pr("k");
+	//pr("l");
+	pr("m\tchange value of ADC multiplier No N");
+	//pr("n");
+	pr("o\topen shutter");
+	pr(STR_MOTORS_VOLTAGE "\tshow motors voltage");
+	//pr("q");
+	pr("r\treinit shutter");
+	pr(STR_EXTADC_VALUES "\tshow AD7794 values");
+	pr(STR_SHTR_STATE "\tprint shutter state");
+	pr("u\tcheck USB connection");
+	//pr("v");
+	//pr("w");
+	pr("x\tset timer period for turrets' motors");
+	//pr("y");
+	//pr("z");
+	pr("\nAfter entering of user value press '+' to submit or '-' to reject it");
+	#undef pr
+}
+
+/**
+ * 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, sendfun s){
+	uint8_t command, do_echo = 1;
 	//uint32_t utmp;
 	int i = 0, j, m;
 	lastsendfun = s;
-	if(Uval_ready == UVAL_START){ // we are in process of user's value reading
-		i += read_int(buf, len);
-	}
-	if(Uval_ready == UVAL_ENTERED){
-		P("confirm entered value (+/-): ", s);
-		print_int(User_value, s); // printout readed integer value for error control
-		Uval_ready = UVAL_PRINTED;
-	}
-	if(I && Uval_ready == UVAL_CHECKED){
-		Uval_ready = UVAL_BAD; // clear Uval_ready
-		I(User_value, s);
-		return;
+	if(buf[0] == '[') mode = LINE_MODE;
+	if(mode == BYTE_MODE){
+		if(Uval_ready == UVAL_START){ // we are in process of user's value reading
+			i += read_int(buf, len);
+		}
+		if(Uval_ready == UVAL_ENTERED){
+			P("confirm entered value (+/-): ", s);
+			print_int(User_value, s); // printout readed integer value for error control
+			Uval_ready = UVAL_PRINTED;
+		}
+		if(I && Uval_ready == UVAL_CHECKED){
+			Uval_ready = UVAL_BAD; // clear Uval_ready
+			I(User_value, s);
+			return 0;
+		}
+	}else if(mode == LINE_MODE){ // text mode: check for "]\n" presence
+		uint8_t bad_cmd = 1;
+s(buf[0]);
+P(" check buffer in line mode: ", s);
+		if(buf[0] == '['){
+		for(j = 1; j < len; j++){
+s(buf[j]);
+			if(buf[j] != '\n') continue; // search end of line
+			else{
+				if(buf[j-1] == ']'){
+P("OK, good!\n", s);
+					bad_cmd = 0;
+					len = j; buf[j] = 0; // truncate buffer to only one command
+
+					break;
+				}
+				else{
+P("broken command!\n",s);
+					return 0; // end of line without closing bracket
+				}
+			}
+		}} else{
+P("wrong first\n",s );
+			return 0;
+		}
+		if(bad_cmd){
+P("not full\n",s);
+			return len; // not enough data in buffer
+		}
 	}
 	for(; i < len; i++){
 		command = buf[i];
@@ -128,10 +319,149 @@ void parce_incoming_buf(char *buf, int len, sendfun s){
 			I = stepper_proc;
 			READINT();
 		}else switch (command){
-			case 'P':
+			case '[': // line mode - do nothing, this is start symbol
+				//mode = LINE_MODE;
+			break;
+			case '+': // user check number value & confirm it's right
+				if(mode != BYTE_MODE) return 0; // bad command - no echo
+				if(Uval_ready == UVAL_PRINTED) Uval_ready = UVAL_CHECKED;
+				else WRONG_COMMAND();
+			break;
+			case '-': // user check number value & confirm it's wrong
+				if(mode != BYTE_MODE) return 0; // bad command - no echo
+				if(Uval_ready == UVAL_PRINTED) Uval_ready = UVAL_BAD;
+				else WRONG_COMMAND();
+			break;
+			case CMD_INTADC_VALUES: // [A] show TRD values by inner ADC [ A 0 val0 ]\n[A 1 val1 ] ...
+				//adc_start_conversion_direct(ADC1);
+				print_int_ad_vals(s);
+				if(mode == BYTE_MODE) s('\n');
+				do_echo = 0; // don't echo command in line mode as there's output
+			break;
+			case 'b': // byte mode
+				mode = BYTE_MODE;
+				//return 0; //don't echo this command
+			break;
+			case CMD_STOP_ALL_MOTORS: // [B] stop all motors
+				for(m = 0; m < 5; m++)
+					stop_motor(m);
+				do_echo = 0; // echo called from sto
+			break;
+			case 'c': // [c] close shutter
+				do_echo = try_to_close_shutter(); // don't echo in case of state wouldn't be changed
+			break;
+			case 'd': // change ADC_divisor (only for byte mode)
+				if(mode != BYTE_MODE) return 0;
+				div_mul = 1; //divisors
+				I = try_ch_divmul;
+				READINT();
+			break;
+			case 'D': // double conversion (only for byte mode)
+				if(mode != BYTE_MODE) return 0;
+				doubleconv = 1;
+			break;
+			case CMD_ENDSW_STATE: // [E] print end-switch state for given motor
+				I = endswitchstate;
+				READINT();
+			break;
+			case 'F': // dump flash data (only in byte mode)
+				if(mode != BYTE_MODE) return 0;
+				dump_flash_data(s);
+			break;
+			case 'g': // change gain (only in byte mode)
+				if(mode != BYTE_MODE) return 0;
+				I = set_ADC_gain;
+				READINT();
+			break;
+			case CMD_SHTR_VOLTAGE: // [h] show sHutter voltage * 100
+				if(mode == LINE_MODE) P("[ " STR_SHTR_VOLTAGE " ", s);
+				print_int(shutter_voltage(), s);
+				if(mode == LINE_MODE) P(" ]", s);
+				newline(s);
+				do_echo = 0;
+			break;
+			case 'H': // show help (only in byte mode)
+				if(mode != BYTE_MODE) return 0;
+				help(s);
+			break;
+			case CMD_EXTADC_INIT: // [i] init AD7794
+				AD7794_init();
+			break;
+			case 'I': // turn off flag AD7794
+				ad7794_on = 0;
+			break;
+			case 'J': // move turret 0/1/2 to given position
+			case 'K':
+			case 'L':
+				active_motor = command - 'J'; // J == 0, K == 1, L == 2
+				I = move_turret;
+				READINT();
+			break;
+			case 'm': // change ADC_multiplier (only for byte mode)
+				if(mode != BYTE_MODE) return 0;
+				div_mul = 0; // multipliers
+				I = try_ch_divmul;
+				READINT();
+			break;
+			case 'M': // ADC monitoring ON
+				ADC_monitoring = !ADC_monitoring;
+			break;
+			case 'o': // open shutter
+				do_echo = try_to_open_shutter();
+			break;
+			case CMD_MOTORS_VOLTAGE: // [p] show motors voltage * 100
+				if(mode == LINE_MODE) P("[ " STR_MOTORS_VOLTAGE " ", s);
+				print_int(power_voltage(), s);
+				if(mode == LINE_MODE) P(" ]", s);
+				newline(s);
+			break;
+			case 'P': //  (only for byte mode)
+				if(mode != BYTE_MODE) return 0;
 				OW_fill_ID(0);
 				//run_dmatimer();
 			break;
+			case 'r': // reinit shutter
+				shutter_init();
+			break;
+			case CMD_EXTADC_VALUES: // [s] read ADC val through SPI
+				if(!ad7794_on){
+					AD7794_init();
+					if(mode == BYTE_MODE) P("wait: values aren't ready yet\n", s);
+					break;
+				}
+				if(mode == BYTE_MODE) P("AD7794 values: ", s);
+				print_ad_vals(s);
+				do_echo = 0;
+			break;
+			case 'S': // single conversion (only for byte mode)
+				if(mode != BYTE_MODE) return 0;
+				doubleconv = 0;
+			break;
+			case CMD_SHTR_STATE: // [t] print shutter state
+				print_shutter_state(s);
+				do_echo = 0;
+			break;
+			case CMD_PRINT_TIME: // print time
+				print_time(s);
+				if(mode == BYTE_MODE) newline(s);
+			break;
+			case 'u': // check USB connection (only byte mode)
+				if(mode != BYTE_MODE) return 0;
+				P("\nUSB ", s);
+				if(!USB_connected) P("dis", s);
+				P("connected\n",s);
+			break;
+		/*	case 'U': // test: init USART1
+				UART_init(USART1);
+			break; */
+		/*	case 'W': // scan for one 1-wire device
+				if(1 == OW_Scan(onewire_addr, 1)){
+					P("found 1-wire: ", s);
+					print_hex(onewire_addr, 8, s);
+				}else
+					P("1-wire error",s );
+				P("\n", s);
+			break;*/
 			case 'x': // set period of TIM1 (motors 1..3)
 				active_motor = 1;
 				I = set_timr;
@@ -142,117 +472,26 @@ void parce_incoming_buf(char *buf, int len, sendfun s){
 				I = set_timr;
 				READINT();
 			break;
-			case 'B': // stop all motors
-				for(m = 0; m < 5; m++)
-					stop_motor(m);
-			break;
-		/*	case 'W': // scan for one 1-wire device
-				if(1 == OW_Scan(onewire_addr, 1)){
-					P("found 1-wire: ", s);
-					print_hex(onewire_addr, 8, s);
-				}else
-					P("1-wire error",s );
-				P("\n", s);
-			break;*/
-			case 'S': // single conversion
-				doubleconv = 0;
-			break;
-			case 'D': // double conversion
-				doubleconv = 1;
-			break;
-			case 'A': // show TRD values
-				//adc_start_conversion_direct(ADC1);
-				P("\nTRD resistance: ", s);
-				for(j = 0; j < 8; j++){
-					print_int(TRD_value(i), s);
-					s('\t');
-				}
-				newline(s);
-			break;
-			case 'i': // init AD7794
-				AD7794_init();
-			break;
-			case 'I': // turn off flag AD7794
-				ad7794_on = 0;
-			break;
-			case '+': // user check number value & confirm it's right
-				if(Uval_ready == UVAL_PRINTED) Uval_ready = UVAL_CHECKED;
-				else WRONG_COMMAND();
-			break;
-			case '-': // user check number value & confirm it's wrong
-				if(Uval_ready == UVAL_PRINTED) Uval_ready = UVAL_BAD;
-				else WRONG_COMMAND();
-			break;
-			case 'g': // change gain
-				I = set_ADC_gain;
-				READINT();
-			break;
-			case 's': // read ADC val through SPI
-				if(!ad7794_on){
-					AD7794_init();
-					P("wait: values aren't ready yet\n", s);
-					break;
-				}
-				P("AD7794 values: ", s);
-				print_ad_vals(s);
-			break;
-			case 'u': // check USB connection
-				P("\nUSB ", s);
-				if(!USB_connected) P("dis", s);
-				P("connected\n",s);
-			break;
-			case 'M': // ADC monitoring ON
-				ADC_monitoring = !ADC_monitoring;
-			break;
-			case 'T': // print time
-				print_time(s);
-				newline(s);
-			break;
-		/*	case 'U': // test: init USART1
-				UART_init(USART1);
-			break; */
-			case 'p': // show motors voltage * 100
-				print_int(power_voltage(), s);
-				newline(s);
-			break;
-			case 'h': // show sHutter voltage * 100
-				print_int(shutter_voltage(), s);
-				newline(s);
-			break;
-			case 'r': // reinit shutter
-				shutter_init();
-			break;
-			case 't': // print shutter state
-				print_shutter_state(s);
-			break;
-			case 'c': // close shutter
-				try_to_close_shutter();
-			break;
-			case 'o': // open shutter
-				try_to_open_shutter();
-			break;
-			case 'F': // dump flash data
-				dump_flash_data(s);
-			break;
-			case 'd': // change ADC_divisor
-				div_mul = 1; //divisors
-				I = try_ch_divmul;
-				READINT();
-			break;
-			case 'm': // change ADC_multiplier
-				div_mul = 0; // multipliers
-				I = try_ch_divmul;
-				READINT();
-			break;
-			case '\n': // show newline as is
-			break;
+			case '\n': // show newline, space and tab as is
 			case '\r':
+			case ' ':
+			case '\t':
 			break;
 			default:
-				WRONG_COMMAND(); // echo '?' on unknown command
+				WRONG_COMMAND(); // echo '?' on unknown command in byte mode
 		}
-		s(command); // echo readed byte
+		if(mode == BYTE_MODE) s(command); // echo readed byte in byte mode
 	}
+	if(mode == LINE_MODE){ // process command which needs for user value
+		if(I && Uval_ready == UVAL_ENTERED){
+			Uval_ready = UVAL_BAD; // clear Uval_ready
+			do_echo = I(User_value, s);
+			I = NULL;
+		}
+	}
+	if(do_echo && mode == LINE_MODE)
+		P(buf, s);
+	return 0; // all data processed - 0 bytes leave in buffer
 }
 
 /*
@@ -269,8 +508,6 @@ void newline(sendfun s){
 }
 */
 
-// sign of readed value
-int32_t sign;
 /**
  * Read from TTY integer value given by user (in DEC).
  *    Reading stops on first non-numeric symbol.
@@ -283,8 +520,11 @@ int32_t sign;
  */
 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
 	}
@@ -292,21 +532,27 @@ int read_int(char *buf, int cnt){
 	for(i = 0; i < cnt; i++, readed++){
 		uint8_t chr = buf[i];
 		if(chr == '-'){
-			if(sign == 1){
+			if(enteredDigits == 0){ // sign should be first
 				sign = -1;
 				continue;
-			}else{ // '-' after numbers
-				Uval_ready = UVAL_ENTERED;
+			}else{ // '-' after number - reject entered value
+				Uval_ready = UVAL_BAD;
 				break;
 			}
 		}
 		if(chr < '0' || chr > '9'){
-			Uval_ready = UVAL_ENTERED;
+			if(enteredDigits)
+				Uval_ready = UVAL_ENTERED;
+			else{
+				if(chr == ' ' || chr == '\t') continue; // omit leading space|tab
+				else Uval_ready = UVAL_BAD; // bad symbol
+			}
 			break;
 		}
 		User_value = User_value * 10 + (int32_t)(chr - '0');
+		enteredDigits++;
 	}
-	if(Uval_ready != UVAL_START) // reading has met an non-numeric character
+	if(Uval_ready == UVAL_ENTERED) // reading has met an non-numeric character
 		User_value *= sign;
 	return readed;
 }
@@ -361,7 +607,10 @@ void process_int(int32_t v, sendfun s){
 }
 */
 
-void set_ADC_gain(int32_t v, sendfun s){
+/**
+ * change AD7794 gain. Run only in byte mode!
+ */
+uint8_t set_ADC_gain(int32_t v, sendfun s){
 	if(ad7794_on){
 		P("Change gain to ", s);
 		print_int(v, s);
@@ -369,6 +618,7 @@ void set_ADC_gain(int32_t v, sendfun s){
 		change_AD7794_gain(v);
 		AD7794_calibration(0);
 	}
+	return 0;
 }
 
 /**
@@ -376,28 +626,32 @@ void set_ADC_gain(int32_t v, sendfun s){
  * @param v - user value
  * @param s - active sendfunction
  */
-void stepper_proc(int32_t v, sendfun s){
+uint8_t stepper_proc(int32_t v, sendfun s){
 	if(active_motor > 4){
-		P("wrong motor number\n", s);
-		return; // error
+		if(mode == BYTE_MODE) P("wrong motor number\n", s);
+		return 0; // error
 	}
-	move_motor(active_motor, v);
+	uint8_t ret = move_motor(active_motor, v);
 	active_motor = 6;
+	return ret;
 }
 
-void set_timr(int32_t v, sendfun s){
+uint8_t set_timr(int32_t v, sendfun s){
 	if(active_motor > 4){
-		P("wrong motor number\n", s);
-		return; // error
+		if(mode == BYTE_MODE) P("wrong motor number\n", s);
+		return 0; // error
 	}
 	if(v < 0 || v > 0xffff){
-		MSG("Bad period!\n");
+		if(mode == BYTE_MODE) P("Bad period!\n", s);
 		active_motor = 6;
-		return;
+		return 0;
+	}
+	if(mode == BYTE_MODE){
+		P("set period: ", s);
+		print_int(v, s);
+		P("\n", s);
 	}
-	MSG("set period: ");
-	print_int(v, lastsendfun);
-	MSG("\n");
 	set_motor_period(active_motor, (uint16_t)v);
 	active_motor = 6;
+	return 1;
 }
diff --git a/with_opencm3/user_proto.h b/with_opencm3/user_proto.h
index 2273be9..8c19c96 100644
--- a/with_opencm3/user_proto.h
+++ b/with_opencm3/user_proto.h
@@ -30,18 +30,33 @@
 #define P(arg, s) prnt((uint8_t*)arg, s)
 // debug message - over USB
 #ifdef EBUG
-	#define DBG(a) prnt((uint8_t*)a, usb_send)
+	#define DBG(a) do{if(mode == BYTE_MODE) prnt((uint8_t*)a, usb_send);}while(0)
 #else
 	#define DBG(a)
 #endif
 
-#define MSG(arg) prnt((uint8_t*)arg, lastsendfun)
+#define MSG(argb, argl) do{if(mode == BYTE_MODE) prnt((uint8_t*)argb, lastsendfun); \
+			else if(mode == LINE_MODE) prnt((uint8_t*)argl, lastsendfun);}while(0)
 
-#define ERR(arg) do{prnt((uint8_t*)"Error! ",lastsendfun); prnt((uint8_t*)arg, lastsendfun);}while(0)
+#define BYTE_MSG(arg) do{if(mode == BYTE_MODE) prnt((uint8_t*)arg, lastsendfun);}while(0)
 
-typedef void (*sendfun)(uint8_t); // function to send a byte
-typedef void (*intfun)(int32_t, sendfun); // function to process entered integer value at end of input
+#define ERR(arg) do{if(mode == BYTE_MODE){prnt((uint8_t*)"Error! ",lastsendfun); \
+					prnt((uint8_t*)arg, lastsendfun);}}while(0)
 
+// function to send a byte
+typedef void (*sendfun)(uint8_t);
+
+// function to process entered integer value at end of input
+//return 1 if there's no output in this function (for echo), 0 if there's output
+typedef uint8_t (*intfun)(int32_t, sendfun);
+
+typedef enum{
+	 BYTE_MODE   // data entered byte by byte interactively
+	,LINE_MODE   // line mode like '[ command parameters ]\n'
+	,BINARY_MODE // reserved
+} curmode_t;
+
+extern curmode_t mode;
 extern sendfun lastsendfun; // last active send function - to post "anonymous" replies
 
 void prnt(uint8_t *wrd, sendfun s);
@@ -50,13 +65,39 @@ void prnt(uint8_t *wrd, sendfun s);
 
 void print_int(int32_t N, sendfun s);
 
-void parce_incoming_buf(char *buf, int len, sendfun s);
+int parce_incoming_buf(char *buf, int len, sendfun s);
 
 // void process_int(int32_t v, sendfun s);
-void set_ADC_gain(int32_t v, sendfun s);
+uint8_t set_ADC_gain(int32_t v, sendfun s);
 void print_ad_vals(sendfun s);
-void stepper_proc(int32_t v, sendfun s);
-void set_timr(int32_t v, sendfun s);
+void print_int_ad_vals(sendfun s);
+uint8_t stepper_proc(int32_t v, sendfun s);
+uint8_t set_timr(int32_t v, sendfun s);
 void print_hex(uint8_t *buff, uint8_t l, sendfun s);
 
+
+/**
+ * here is commands definition (what is outhern function should print message?)
+ * in line mode commands are echoed with some usefull information
+ * in case of error inside command arguments will be word "ERR"
+ */
+#define CMD_INTADC_VALUES			'A'
+#define STR_INTADC_VALUES			"A"
+#define CMD_STOP_ALL_MOTORS			'B'
+#define STR_STOP_ALL_MOTORS			"B"
+#define CMD_ENDSW_STATE				'E'
+#define STR_ENDSW_STATE				"E"
+#define CMD_SHTR_VOLTAGE			'h'
+#define STR_SHTR_VOLTAGE			"h"
+#define CMD_EXTADC_INIT				'i'
+#define STR_EXTADC_INIT				"i"
+#define CMD_MOTORS_VOLTAGE			'p'
+#define STR_MOTORS_VOLTAGE			"p"
+#define CMD_EXTADC_VALUES			's'
+#define STR_EXTADC_VALUES			"s"
+#define CMD_SHTR_STATE				't'
+#define STR_SHTR_STATE				"t"
+#define CMD_PRINT_TIME				'T'
+#define STR_PRINT_TIME				"T"
+
 #endif // __USER_PROTO_H__