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/*
* The MIT License (MIT)
*
* Copyright (c) 2016 Matthias P. Braendli, Maximilien Cuony
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "stm32f4xx_conf.h"
#include "stm32f4xx.h"
#include "FreeRTOS.h"
#include "FreeRTOSConfig.h"
#include "task.h"
#include "common.h"
#include "tm_stm32f4_ds18b20.h"
#include "tm_stm32f4_onewire.h"
#include "temperature.h"
#include "delay.h"
float _temperature_last_value;
int _temperature_valid;
const TickType_t _temperature_delay = 60000 / portTICK_PERIOD_MS; // 60s
static TM_OneWire_t tm_onewire;
void ds18b20_init() {
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = TEMPERATURE_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);
vTaskSuspendAll();
TM_OneWire_Init(&tm_onewire, GPIOA, TEMPERATURE_ONEWIRE_PIN);
xTaskResumeAll();
}
int ds18b20_gettemp_one(float *temperature) {
vTaskSuspendAll();
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
xTaskResumeAll();
delay_ms(100);
vTaskSuspendAll();
status = TM_DS18B20_Read(&tm_onewire, rom_addr, temperature);
}
xTaskResumeAll();
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_ms(5);
}
return status;
}
static void temperature_task(void *pvParameters) {
while (1) {
if (!_temperature_valid) {
ds18b20_init();
}
if (ds18b20_gettemp(&_temperature_last_value)) {
_temperature_valid = 1;
} else {
_temperature_valid = 0;
}
vTaskDelay(_temperature_delay);
}
}
void temperature_init() {
xTaskCreate(
temperature_task,
"TaskTemperature",
4*configMINIMAL_STACK_SIZE,
(void*) NULL,
tskIDLE_PRIORITY + 2UL,
NULL);
}
// Return the current temperature
float temperature_get() {
if (_temperature_valid) {
return _temperature_last_value;
} else {
return 0.0f;
}
}
// Return 1 if the temperature is valid
int temperature_valid() {
return _temperature_valid;
}
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