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add degrC calculation

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eddyem 2018-05-27 18:44:28 +03:00
parent 4e74e1121b
commit 32fef9cc9f
13 changed files with 5372 additions and 0 deletions
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144
STM32/Tcalc/Makefile Normal file
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BINARY = tsys01
BOOTPORT ?= /dev/ttyUSB0
BOOTSPEED ?= 9600
# MCU FAMILY
FAMILY = F0
# MCU code
MCU = F042x6
# hardware definitions
#DEFS := -DUSARTNUM=2 -DI2CPINS=A9A10
DEFS += -DEBUG
# change this linking script depending on particular MCU model,
# for example, if you have STM32F103VBT6, you should write:
LDSCRIPT = ld/stm32f042k.ld
INDEPENDENT_HEADERS=
FP_FLAGS ?= -msoft-float
ASM_FLAGS = -mthumb -mcpu=cortex-m0 -march=armv6-m -mtune=cortex-m0
ARCH_FLAGS = $(ASM_FLAGS) $(FP_FLAGS)
###############################################################################
# Executables
OPREFIX ?= /opt/bin/arm-none-eabi
#PREFIX ?= /usr/x86_64-pc-linux-gnu/arm-none-eabi/gcc-bin/7.3.0/arm-none-eabi
PREFIX ?= $(OPREFIX)
RM := rm -f
RMDIR := rmdir
CC := $(PREFIX)-gcc
LD := $(PREFIX)-gcc
AR := $(PREFIX)-ar
AS := $(PREFIX)-as
OBJCOPY := $(OPREFIX)-objcopy
OBJDUMP := $(OPREFIX)-objdump
GDB := $(OPREFIX)-gdb
STFLASH := $(shell which st-flash)
STBOOT := $(shell which stm32flash)
###############################################################################
# Source files
OBJDIR = mk
LDSCRIPT ?= $(BINARY).ld
SRC := $(wildcard *.c)
OBJS := $(addprefix $(OBJDIR)/, $(SRC:%.c=%.o))
STARTUP = $(OBJDIR)/startup.o
OBJS += $(STARTUP)
DEPS := $(OBJS:.o=.d)
INC_DIR ?= ../inc
INCLUDE := -I$(INC_DIR)/F0 -I$(INC_DIR)/cm
LIB_DIR := $(INC_DIR)/ld
###############################################################################
# C flags
CFLAGS += -O2 -g -MD -D__thumb2__=1
CFLAGS += -Wall -Wextra -Wshadow -Wimplicit-function-declaration
CFLAGS += -Wredundant-decls $(INCLUDE)
# -Wmissing-prototypes -Wstrict-prototypes
CFLAGS += -fno-common -ffunction-sections -fdata-sections
###############################################################################
# Linker flags
LDFLAGS += --static -nostartfiles
#--specs=nano.specs
LDFLAGS += -L$(LIB_DIR)
LDFLAGS += -T$(LDSCRIPT)
LDFLAGS += -Wl,-Map=$(OBJDIR)/$(BINARY).map
LDFLAGS += -Wl,--gc-sections
###############################################################################
# Used libraries
LDLIBS += -Wl,--start-group -lc -lgcc -Wl,--end-group
LDLIBS += $(shell $(CC) $(CFLAGS) -print-libgcc-file-name)
DEFS += -DSTM32$(FAMILY) -DSTM32$(MCU)
#.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 list
elf: $(ELF)
bin: $(BIN)
hex: $(HEX)
list: $(LIST)
ifneq ($(MAKECMDGOALS),clean)
-include $(DEPS)
endif
$(OBJDIR):
mkdir $(OBJDIR)
$(STARTUP): $(INC_DIR)/startup/vector.c
$(CC) $(CFLAGS) $(DEFS) $(INCLUDE) $(ARCH_FLAGS) -o $@ -c $<
$(OBJDIR)/%.o: %.c
@echo " CC $<"
$(CC) $(CFLAGS) $(DEFS) $(INCLUDE) $(ARCH_FLAGS) -o $@ -c $<
#$(OBJDIR)/%.d: %.c $(OBJDIR)
# $(CC) -MM -MG $< | sed -e 's,^\([^:]*\)\.o[ ]*:,$(@D)/\1.o $(@D)/\1.d:,' >$@
$(BIN): $(ELF)
@echo " OBJCOPY $(BIN)"
$(OBJCOPY) -Obinary $(ELF) $(BIN)
$(HEX): $(ELF)
@echo " OBJCOPY $(HEX)"
$(OBJCOPY) -Oihex $(ELF) $(HEX)
$(LIST): $(ELF)
@echo " OBJDUMP $(LIST)"
$(OBJDUMP) -S $(ELF) > $(LIST)
$(ELF): $(OBJDIR) $(OBJS)
@echo " LD $(ELF)"
$(LD) $(LDFLAGS) $(ARCH_FLAGS) $(OBJS) $(LDLIBS) -o $(ELF)
clean:
@echo " CLEAN"
$(RM) $(OBJS) $(DEPS) $(ELF) $(HEX) $(LIST) $(OBJDIR)/*.map
@rmdir $(OBJDIR) 2>/dev/null || true
flash: $(BIN)
@echo " FLASH $(BIN)"
$(STFLASH) write $(BIN) 0x8000000
boot: $(BIN)
@echo " LOAD $(BIN) through bootloader"
$(STBOOT) -b$(BOOTSPEED) $(BOOTPORT) -w $(BIN)
gentags:
CFLAGS="$(CFLAGS) $(DEFS)" geany -g $(BINARY).c.tags *[hc] 2>/dev/null
.PHONY: clean flash boot gentags

15
STM32/Tcalc/Readme.md Normal file
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# Check temperature on sensors pair and show values of T measured by USART.
USART speed 115200. Code for NUCLEO-042
### Serial interface commands (ends with '\n'):
- **C** show coefficients for both thermosensors
- **D** detect seosors (reseting them)
- **H** switch I2C to high speed (100kHz)
- **L** switch I2C to low speed (default, 10kHz)
- **R** reset both sensors
- **T** get temperature in degrC
### PINOUT
- I2C: PA9 (SCL) & PA10 (SDA)
- USART2: PA2 (Tx) & PA15 (Rx)

66
STM32/Tcalc/hardware.c Normal file
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/*
* geany_encoding=koi8-r
* hardware.c - hardware-dependent macros & functions
*
* Copyright 2018 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 "hardware.h"
void gpio_setup(void){
// Set green led (PB3) as output
RCC->AHBENR |= RCC_AHBENR_GPIOBEN | RCC_AHBENR_GPIOAEN;
GPIOB->MODER = GPIO_MODER_MODER3_O;
// setup of multiplexer channel address bus: PA3..8
GPIOA->MODER = GPIO_MODER_MODER3_O | GPIO_MODER_MODER4_O | GPIO_MODER_MODER5_O |
GPIO_MODER_MODER6_O | GPIO_MODER_MODER7_O | GPIO_MODER_MODER8_O;
}
void i2c_setup(I2C_SPEED speed){
I2C1->CR1 = 0;
#if I2CPINS == A9A10
/*
* GPIO Resources: I2C1_SCL - PA9, I2C1_SDA - PA10
* GPIOA->AFR[1] AF4 -- GPIOA->AFR[1] &= ~0xff0, GPIOA->AFR[1] |= 0x440
*/
RCC->AHBENR |= RCC_AHBENR_GPIOAEN; // clock
GPIOA->AFR[1] &= ~0xff0; // alternate function F4 for PA9/PA10
GPIOA->AFR[1] |= 0x440;
GPIOA->MODER &= ~(GPIO_MODER_MODER9 | GPIO_MODER_MODER10);
GPIOA->MODER |= GPIO_MODER_MODER9_AF | GPIO_MODER_MODER10_AF; // alternate function
GPIOA->OTYPER |= GPIO_OTYPER_OT_9 | GPIO_OTYPER_OT_10; // opendrain
//GPIOA->OTYPER |= GPIO_OTYPER_OT_10; // opendrain
#else // undefined
#error "Not implemented"
#endif
// I2C
RCC->APB1ENR |= RCC_APB1ENR_I2C1EN; // timing
RCC->CFGR3 |= RCC_CFGR3_I2C1SW; // use sysclock for timing
if(speed == LOW_SPEED){ // 10kHz
// PRESC=B, SCLDEL=4, SDADEL=2, SCLH=0xC3, SCLL=0xC7
//I2C1->TIMINGR = (0xB<<28) | (4<<20) | (2<<16) | (0xC3<<8) | (0xC7);
I2C1->TIMINGR = (0xB<<28) | (4<<20) | (2<<16) | (0xC3<<8) | (0xB0);
}else{ // 100kHz
// Clock = 6MHz, 0.16(6)us, need 5us (*30)
// PRESC=4 (f/5), SCLDEL=0 (t_SU=5/6us), SDADEL=0 (t_HD=5/6us), SCLL,SCLH=14 (2.(3)us)
//I2C1->TIMINGR = (4<<28) | (14<<8) | (14); // 0x40000e0e
I2C1->TIMINGR = (0xB<<28) | (4<<20) | (2<<16) | (0x12<<8) | (0x11);
}
I2C1->CR1 = I2C_CR1_PE;// | I2C_CR1_RXIE; // Enable I2C & (interrupt on receive - not supported yet)
}

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STM32/Tcalc/hardware.h Normal file
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/*
* geany_encoding=koi8-r
* hardware.h
*
* Copyright 2018 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 "stm32f0.h"
#define LED0_port GPIOB
#define LED0_pin (1<<3)
#ifndef USARTNUM
#define USARTNUM 2
#endif
#define CONCAT(a,b) a ## b
#define STR_HELPER(s) #s
#define STR(s) STR_HELPER(s)
#define FORMUSART(X) CONCAT(USART, X)
#define USARTX FORMUSART(USARTNUM)
#ifndef I2CPINS
#define I2CPINS A9A10
#endif
#ifndef LED1_port
#define LED1_port LED0_port
#endif
#ifndef LED1_pin
#define LED1_pin LED0_pin
#endif
#define LED_blink(x) pin_toggle(x ## _port, x ## _pin)
// set active channel number
#define MUL_ADDRESS(x) do{GPIOA->BSRR = (0x1F8 << 16) | (x << 3);}while(0)
typedef enum{
LOW_SPEED,
HIGH_SPEED
} I2C_SPEED;
void gpio_setup(void);
void i2c_setup(I2C_SPEED speed);

99
STM32/Tcalc/i2c.c Normal file
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/*
* geany_encoding=koi8-r
* i2c.c
*
* Copyright 2017 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 "stm32f0.h"
#include "hardware.h"
#include "i2c.h"
/**
* I2C for TSYS01
* Speed <= 400kHz (200)
* t_SCLH > 21ns
* t_SCLL > 21ns
* while reading, sends NACK
* after reading get 24bits of T value, we need upper 2 bytes: ADC16 = ADC>>8
* T = (-2) * k4 * 10^{-21} * ADC16^4
* + 4 * k3 * 10^{-16} * ADC16^3
* + (-2) * k2 * 10^{-11} * ADC16^2
* + 1 * k1 * 10^{-6} * ADC16
* +(-1.5)* k0 * 10^{-2}
* All coefficiens are in registers:
* k4 - 0xA2, k3 - 0xA4, k2 - 0xA6, k1 - 0xA8, k0 - 0xAA
*/
extern volatile uint32_t Tms;
static uint32_t cntr;
/**
* write command byte to I2C
* @param addr - device address (TSYS01_ADDR0 or TSYS01_ADDR1)
* @param data - byte to write
* @return 0 if error
*/
uint8_t write_i2c(uint8_t addr, uint8_t data){
cntr = Tms;
while(I2C1->ISR & I2C_ISR_BUSY) if(Tms - cntr > I2C_TIMEOUT) return 0; // check busy
cntr = Tms;
while(I2C1->CR2 & I2C_CR2_START) if(Tms - cntr > I2C_TIMEOUT) return 0; // check start
I2C1->CR2 = 1<<16 | addr | I2C_CR2_AUTOEND; // 1 byte, autoend
// now start transfer
I2C1->CR2 |= I2C_CR2_START;
cntr = Tms;
while(!(I2C1->ISR & I2C_ISR_TXIS)){ // ready to transmit
if(I2C1->ISR & I2C_ISR_NACKF){
I2C1->ICR |= I2C_ICR_NACKCF;
return 0;
}
if(Tms - cntr > I2C_TIMEOUT) return 0;
}
I2C1->TXDR = data; // send data
return 1;
}
/**
* read nbytes (2 or 3) of data from I2C line
* @return 1 if all OK, 0 if NACK or no device found
*/
uint8_t read_i2c(uint8_t addr, uint32_t *data, uint8_t nbytes){
uint32_t result = 0;
cntr = Tms;
while(I2C1->ISR & I2C_ISR_BUSY) if(Tms - cntr > 5) return 0; // check busy
cntr = Tms;
while(I2C1->CR2 & I2C_CR2_START) if(Tms - cntr > 5) return 0; // check start
// read N bytes
I2C1->CR2 = (nbytes<<16) | addr | 1 | I2C_CR2_AUTOEND | I2C_CR2_RD_WRN;
I2C1->CR2 |= I2C_CR2_START;
uint8_t i;
cntr = Tms;
for(i = 0; i < nbytes; ++i){
while(!(I2C1->ISR & I2C_ISR_RXNE)){ // wait for data
if(I2C1->ISR & I2C_ISR_NACKF){
I2C1->ICR |= I2C_ICR_NACKCF;
return 0;
}
if(Tms - cntr > 5) return 0;
}
result = (result << 8) | I2C1->RXDR;
}
*data = result;
return 1;
}

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/*
* geany_encoding=koi8-r
* i2c.h
*
* Copyright 2017 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.
*
*/
// timeout in ms
#define I2C_TIMEOUT (15)
// CSB=1, address 1110110
#define TSYS01_ADDR0 (0x76 << 1)
// CSB=0, address 1110111
#define TSYS01_ADDR1 (0x77 << 1)
// registers: reset, read ADC value, start converstion, sart of PROM
#define TSYS01_RESET (0x1E)
#define TSYS01_ADC_READ (0x00)
#define TSYS01_START_CONV (0x48)
#define TSYS01_PROM_ADDR0 (0xA0)
// conversion time = 10ms
#define CONV_TIME (10)
uint8_t read_i2c(uint8_t addr, uint32_t *data, uint8_t nbytes);
uint8_t write_i2c(uint8_t addr, uint8_t data);

12
STM32/Tcalc/ld/stm32f042k.ld Normal file
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/* Linker script for STM32F042x6, 32K flash, 6K RAM. */
/* Define memory regions. */
MEMORY
{
rom (rx) : ORIGIN = 0x08000000, LENGTH = 32K
ram (rwx) : ORIGIN = 0x20000000, LENGTH = 6K
}
/* Include the common ld script. */
INCLUDE stm32f0.ld

253
STM32/Tcalc/main.c Normal file
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/*
* main.c
*
* Copyright 2017 Edward V. Emelianoff <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 "hardware.h"
#include "usart.h"
#include "i2c.h"
static uint16_t coefficients[2][5]; // Coefficients for given sensors
volatile uint32_t Tms = 0;
/* Called when systick fires */
void sys_tick_handler(void){
++Tms;
}
// print 32bit unsigned int
void printu(uint32_t val){
char buf[11], rbuf[10];
int l = 0, bpos = 0;
if(!val){
buf[0] = '0';
l = 1;
}else{
while(val){
rbuf[l++] = val % 10 + '0';
val /= 10;
}
int i;
bpos += l;
for(i = 0; i < l; ++i){
buf[--bpos] = rbuf[i];
}
}
while(LINE_BUSY == usart_send_blocking(buf, l+bpos));
}
void showcoeffs(uint8_t addr, uint8_t verb){ // show norm coefficiens
int i;
const uint8_t regs[5] = {0xAA, 0xA8, 0xA6, 0xA4, 0xA2}; // commands for coefficients
uint32_t K;
char numbr = (addr == TSYS01_ADDR0) ? '0' : '1';
uint16_t *coef = coefficients[numbr-'0'];
for(i = 0; i < 5; ++i){
if(write_i2c(addr, regs[i])){
if(read_i2c(addr, &K, 2)){
coef[i] = K;
if(verb){
char b[4] = {'K', numbr, i+'0', '='};
while(ALL_OK != usart_send_blocking(b, 4));
printu(K);
newline();
}
}
}
}
}
/**
* Get temperature & calculate it by polinome
* T = (-2) * k4 * 10^{-21} * ADC16^4
* + 4 * k3 * 10^{-16} * ADC16^3
* + (-2) * k2 * 10^{-11} * ADC16^2
* + 1 * k1 * 10^{-6} * ADC16
* +(-1.5)* k0 * 10^{-2}
* k0*(-1.5e-2) + 1e-6*val*(k1 + 1e-5*val*(-2*k2 + 1e-5*val*(4*k3 + -2e-5*k4*val)))
* answer is in 100th
*/
uint8_t calc_t(uint32_t t, int i){
if(coefficients[i][0] == 0){
if(i == 0) showcoeffs(TSYS01_ADDR0, 0);
else showcoeffs(TSYS01_ADDR1, 0);
}
if(coefficients[i][0] == 0){
SEND("no sensor\n");
return 0;
}
if (t < 6500000 || t > 13000000) return 0; // wrong value - too small or too large
int j;
double d = (double)t/256., tmp = 0.;
// k0*(-1.5e-2) + 0.1*1e-5*val*(1*k1 + 1e-5*val*(-2.*k2 + 1e-5*val*(4*k3 + 1e-5*val*(-2*k4))))
double mul[5] = {-1.5e-2, 1., -2., 4., -2.};
for(j = 4; j > 0; --j){
tmp += mul[j] * (double)coefficients[i][j];
tmp *= 1e-5*d;
}
tmp = tmp/10. + mul[0]*coefficients[i][0];
char b[8] = "TdegC0=";
if(i) b[5] = '1';
while(ALL_OK != usart_send_blocking(b, 7));
if(tmp < 0.){
SEND("-");
tmp = -tmp;
}
uint32_t x = (uint32_t)tmp;
if(x > 120) return 0; // wrong value
printu(x);
tmp -= x;
SEND(".");
x = (uint32_t)(tmp*100);
if(x < 10) SEND("0");
printu(x);
newline();
return 1;
}
/*
void calc_t(){
int i;
for(i = 0; i < 2; ++i){
if(!Tlast[i] || !coefficients[i][0]) continue;
int j;
int64_t d = Tlast[i], tmp = 0.;
// k0*(-1.5e-2) + 0.1*1e-5*val*(1*k1 + 1e-5*val*(-2.*k2 + 1e-5*val*(4*k3 + 1e-5*val*(-2*k4))))
int8_t mul[5] = {0, 1, -2, 4, -2};
for(j = 4; j > 0; --j){
tmp /= 100000;
tmp += mul[j] * (double)coefficients[i][j];
tmp *= d;
tmp >>= 8; // (/256)
}
tmp /= 10000;
uint16_t K = coefficients[i][0];
K += K/2;
tmp -= K;
char b[8] = "TdegC0=";
if(i) b[5] = '1';
while(ALL_OK != usart_send_blocking(b, 7));
if(tmp < 0.){
SEND("-");
tmp = -tmp;
}
uint32_t x = (uint32_t)(tmp/100);
printu(x);
tmp -= 100*x;
SEND(".");
printu((uint32_t)tmp);
newline();
}
}*/
int main(void){
uint32_t lastT = 0;
int16_t L = 0;
uint32_t started0=0, started1=0; // time of measurements for given sensor started
char *txt;
sysreset();
SysTick_Config(6000, 1);
gpio_setup();
usart_setup();
i2c_setup(LOW_SPEED);
// reset on start
write_i2c(TSYS01_ADDR0, TSYS01_RESET);
write_i2c(TSYS01_ADDR1, TSYS01_RESET);
while (1){
if(lastT > Tms || Tms - lastT > 499){
LED_blink(LED0);
lastT = Tms;
}
if(started0 && Tms - started0 > CONV_TIME){ // poll sensor0
if(write_i2c(TSYS01_ADDR0, TSYS01_ADC_READ)){
uint32_t t;
if(read_i2c(TSYS01_ADDR0, &t, 3) && t){
if(!calc_t(t, 0)) write_i2c(TSYS01_ADDR0, TSYS01_RESET);
started0 = 0;
}
}
}
if(started1 && Tms - started1 > CONV_TIME){ // poll sensor1
if(write_i2c(TSYS01_ADDR1, TSYS01_ADC_READ)){
uint32_t t;
if(read_i2c(TSYS01_ADDR1, &t, 3) && t){
if(!calc_t(t, 1)) write_i2c(TSYS01_ADDR1, TSYS01_RESET);
started1 = 0;
}
}
}
if(usartrx()){ // usart1 received data, store in in buffer
L = usart_getline(&txt);
char _1st = txt[0];
if(L == 2 && txt[1] == '\n'){
L = 0;
uint32_t tstart = Tms;
switch(_1st){
case 'C': // 'C' - show coefficients
showcoeffs(TSYS01_ADDR0, 1);
showcoeffs(TSYS01_ADDR1, 1);
break;
case 'R': // 'R' - reset both
SEND("Reset\n");
write_i2c(TSYS01_ADDR0, TSYS01_RESET);
write_i2c(TSYS01_ADDR1, TSYS01_RESET);
break;
case 'D':
if(write_i2c(TSYS01_ADDR0, TSYS01_RESET)) SEND("0");
if(write_i2c(TSYS01_ADDR1, TSYS01_RESET)) SEND("1");
newline();
break;
case 'T': // 'T' - get temperature
if(tstart == 0) tstart = 1;
if(write_i2c(TSYS01_ADDR0, TSYS01_START_CONV)) started0 = tstart;
else{
started0 = 0;
}
if(write_i2c(TSYS01_ADDR1, TSYS01_START_CONV)) started1 = tstart;
else{
started1 = 0;
}
break;
case 'L':
i2c_setup(LOW_SPEED);
SEND("Low speed\n");
break;
case 'H':
i2c_setup(HIGH_SPEED);
SEND("High speed\n");
break;
default: // help
SEND("'C' - show coefficients\n"
"'D' - slave discovery\n"
"'R' - reset both\n"
"'T' - get raw temperature\n"
"'L' - low speed\n"
"'H' - high speed\n");
break;
}
}
}
if(L){ // text waits for sending
while(LINE_BUSY == usart_send(txt, L));
L = 0;
}
}
return 0;
}

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/*us
* usart.c
*
* Copyright 2017 Edward V. Emelianoff <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 "stm32f0.h"
#include "hardware.h"
#include "usart.h"
#include <string.h>
extern volatile uint32_t Tms;
static int datalen[2] = {0,0}; // received data line length (including '\n')
int linerdy = 0, // received data ready
dlen = 0, // length of data (including '\n') in current buffer
bufovr = 0, // input buffer overfull
txrdy = 1 // transmission done
;
int rbufno = 0; // current rbuf number
static char rbuf[UARTBUFSZ][2], tbuf[UARTBUFSZ]; // receive & transmit buffers
static char *recvdata = NULL;
/**
* return length of received data (without trailing zero
*/
int usart_getline(char **line){
if(bufovr){
bufovr = 0;
linerdy = 0;
return 0;
}
*line = recvdata;
linerdy = 0;
return dlen;
}
TXstatus usart_send(const char *str, int len){
if(!txrdy) return LINE_BUSY;
if(len > UARTBUFSZ) return STR_TOO_LONG;
txrdy = 0;
memcpy(tbuf, str, len);
#if USARTNUM == 2
DMA1_Channel4->CCR &= ~DMA_CCR_EN;
DMA1_Channel4->CNDTR = len;
DMA1_Channel4->CCR |= DMA_CCR_EN; // start transmission
#else // USART1
#error "Not implemented"
#endif
return ALL_OK;
}
TXstatus usart_send_blocking(const char *str, int len){
if(!txrdy) return LINE_BUSY;
int i;
bufovr = 0;
for(i = 0; i < len; ++i){
USARTX -> TDR = *str++;
while(!(USARTX->ISR & USART_ISR_TXE));
}
return ALL_OK;
}
void newline(){
while(!txrdy);
USARTX -> TDR = '\n';
while(!(USARTX->ISR & USART_ISR_TXE));
}
// Nucleo's USART2 connected to VCP proxy of st-link
void usart_setup(){
#if USARTNUM == 2
// setup pins: PA2 (Tx - AF1), PA15 (Rx - AF1)
RCC->AHBENR |= RCC_AHBENR_GPIOAEN | RCC_AHBENR_DMAEN;
// AF mode (AF1)
GPIOA->MODER = (GPIOA->MODER & ~(GPIO_MODER_MODER2|GPIO_MODER_MODER15))\
| (GPIO_MODER_MODER2_1 | GPIO_MODER_MODER15_1);
GPIOA->AFR[0] = (GPIOA->AFR[0] &~GPIO_AFRH_AFRH2) | 1 << (2 * 4); // PA2
GPIOA->AFR[1] = (GPIOA->AFR[1] &~GPIO_AFRH_AFRH7) | 1 << (7 * 4); // PA15
// DMA: Tx - Ch4
DMA1_Channel4->CPAR = (uint32_t) &USART2->TDR; // periph
DMA1_Channel4->CMAR = (uint32_t) tbuf; // mem
DMA1_Channel4->CCR |= DMA_CCR_MINC | DMA_CCR_DIR | DMA_CCR_TCIE; // 8bit, mem++, mem->per, transcompl irq
// Tx CNDTR set @ each transmission due to data size
NVIC_SetPriority(DMA1_Channel4_5_IRQn, 3);
NVIC_EnableIRQ(DMA1_Channel4_5_IRQn);
NVIC_SetPriority(USART2_IRQn, 0);
// setup usart2
RCC->APB1ENR |= RCC_APB1ENR_USART2EN; // clock
// oversampling by16, 115200bps (fck=48mHz)
//USART2_BRR = 0x1a1; // 48000000 / 115200
USART2->BRR = 480000 / 1152;
USART2->CR3 = USART_CR3_DMAT; // enable DMA Tx
USART2->CR1 = USART_CR1_TE | USART_CR1_RE | USART_CR1_UE; // 1start,8data,nstop; enable Rx,Tx,USART
while(!(USART2->ISR & USART_ISR_TC)); // polling idle frame Transmission
USART2->ICR |= USART_ICR_TCCF; // clear TC flag
USART2->CR1 |= USART_CR1_RXNEIE;
NVIC_EnableIRQ(USART2_IRQn);
#else // USART1
#error "Not implemented"
#endif
}
#if USARTNUM == 2
void usart2_isr(){
#else // USART1
#error "Not implemented"
#endif
#ifdef CHECK_TMOUT
static uint32_t tmout = 0;
#endif
if(USARTX->ISR & USART_ISR_RXNE){ // RX not emty - receive next char
#ifdef CHECK_TMOUT
if(tmout && Tms >= tmout){ // set overflow flag
bufovr = 1;
datalen[rbufno] = 0;
}
tmout = Tms + TIMEOUT_MS;
if(!tmout) tmout = 1; // prevent 0
#endif
// read RDR clears flag
uint8_t rb = USARTX->RDR;
if(datalen[rbufno] < UARTBUFSZ){ // put next char into buf
rbuf[rbufno][datalen[rbufno]++] = rb;
if(rb == '\n'){ // got newline - line ready
linerdy = 1;
dlen = datalen[rbufno];
recvdata = rbuf[rbufno];
// prepare other buffer
rbufno = !rbufno;
datalen[rbufno] = 0;
#ifdef CHECK_TMOUT
// clear timeout at line end
tmout = 0;
#endif
}
}else{ // buffer overrun
bufovr = 1;
datalen[rbufno] = 0;
#ifdef CHECK_TMOUT
tmout = 0;
#endif
}
}
}
#if USARTNUM == 2
void dma1_channel4_5_isr(){
if(DMA1->ISR & DMA_ISR_TCIF4){ // Tx
DMA1->IFCR |= DMA_IFCR_CTCIF4; // clear TC flag
txrdy = 1;
}
}
#else // USART1
#error "Not implemented"
#endif

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/*
* usart.h
*
* Copyright 2017 Edward V. Emelianoff <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 __USART_H__
#define __USART_H__
// input and output buffers size
#define UARTBUFSZ (64)
// timeout between data bytes
#ifndef TIMEOUT_MS
#define TIMEOUT_MS (1500)
#endif
// macro for static strings
#define SEND(str) do{}while(LINE_BUSY == usart_send_blocking(str, sizeof(str)-1))
#define NEWLINE() do{}while(LINE_BUSY == usart_send_blocking('\n', 1))
typedef enum{
ALL_OK,
LINE_BUSY,
STR_TOO_LONG
} TXstatus;
#define usartrx() (linerdy)
#define usartovr() (bufovr)
extern int linerdy, bufovr, txrdy;
void usart_setup();
int usart_getline(char **line);
TXstatus usart_send(const char *str, int len);
TXstatus usart_send_blocking(const char *str, int len);
void newline();
#endif // __USART_H__