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#include "stm32f4xx.h"
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <stm32f4xx.h>
#include <stm32f4xx_usart.h>
#include <stm32f4xx_conf.h>
#include "tm_stm32f4_ds18b20.h"
#include "tm_stm32f4_onewire.h"
const uint16_t GPIOA_PIN_USART2_RX = GPIO_Pin_3;
const uint16_t GPIOA_PIN_USART2_TX = GPIO_Pin_2;
#define ONEWIRE_PIN GPIO_Pin_1 // PA1
volatile uint64_t timer;
void SysTick_Handler(void)
{
if (timer) timer--;
}
void delay(const uint64_t us)
{
timer = us / 10;
while (timer);
}
char msg[32];
static int cnt = 0;
void printcnt(void)
{
snprintf(msg, 31, "%d ", cnt++);
char* c = msg;
while (*c) {
USART_SendData(USART2, *c);
while(USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET) ;
c++;
}
}
static void usart_puts(USART_TypeDef* USART, const char* str)
{
while(*str) {
// wait until data register is empty
USART_SendData(USART, *str);
while(USART_GetFlagStatus(USART, USART_FLAG_TXE) == RESET) ;
str++;
}
}
#define MAX_MSG_LEN 80
static char usart_debug_message[MAX_MSG_LEN];
void usart_debug(const char *format, ...)
{
va_list list;
va_start(list, format);
vsnprintf(usart_debug_message, MAX_MSG_LEN-1, format, list);
usart_puts(USART2, usart_debug_message);
va_end(list);
}
void usart_debug_puts(const char* str)
{
usart_puts(USART2, str);
}
static TM_OneWire_t tm_onewire;
void ds18b20_init()
{
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = ONEWIRE_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
TM_OneWire_Init(&tm_onewire, GPIOA, ONEWIRE_PIN);
}
int ds18b20_gettemp_one(float *temperature)
{
uint8_t rom_addr[8];
TM_DS18B20_StartAll(&tm_onewire);
int status = TM_OneWire_First(&tm_onewire);
if (status) {
//Save ROM number from device
TM_OneWire_GetFullROM(&tm_onewire, rom_addr);
TM_DS18B20_Start(&tm_onewire, rom_addr);
// The sensor needs time to do the conversion
delay(100ul * 1000ul);
status = TM_DS18B20_Read(&tm_onewire, rom_addr, temperature);
}
return status;
}
int ds18b20_gettemp(float *temperature)
{
int status;
for (int i = 0; i < 10; i++) {
status = ds18b20_gettemp_one(temperature);
if (status) {
break;
}
delay(5000ul);
}
return status;
}
int main(void)
{
SysTick_Config(SystemCoreClock / 100000); // 10us tick
// ============== PC DEBUG USART ===========
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.GPIO_Pin = GPIOA_PIN_USART2_RX | GPIOA_PIN_USART2_TX;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStruct);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_USART2);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_USART2);
// Setup USART2 for 9600,8,N,1
USART_InitTypeDef USART_InitStruct;
USART_InitStruct.USART_BaudRate = 9600;
USART_InitStruct.USART_WordLength = USART_WordLength_8b;
USART_InitStruct.USART_StopBits = USART_StopBits_1;
USART_InitStruct.USART_Parity = USART_Parity_No;
USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStruct.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
USART_Init(USART2, &USART_InitStruct);
#if 0
// enable the USART2 receive interrupt
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 6;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_SetPriority(USART2_IRQn, 6);
#endif
// finally this enables the complete USART2 peripheral
USART_Cmd(USART2, ENABLE);
usart_debug_puts("DS18B20 init\r\n");
ds18b20_init();
while(1) {
float temp = 0.0f;
if (ds18b20_gettemp(&temp)) {
usart_debug("Temperature %f\r\n", temp);
}
else {
usart_debug_puts("No temp\r\n");
}
delay(5 * 1000000ul);
}
}
void USART2_IRQHandler(void)
{
/* RXNE handler */
if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)
{
/* If received 't', toggle LED and transmit 'T' */
if((char)USART_ReceiveData(USART2) == 't')
{
USART_SendData(USART2, 'T');
//while(USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET) ;
}
else {
USART_SendData(USART2, 'N');
USART_SendData(USART2, 'o');
USART_SendData(USART2, '!');
USART_SendData(USART2, '\n');
}
}
}
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