Danger-alarm/SOFTWARE-FreeRTOS/Source/DS18B20.cpp
2024-06-07 00:10:17 +08:00

155 lines
3.8 KiB
C++

#include "DS18B20.hpp"
#include "HC-12.hpp"
#include "common.hpp"
QueueHandle_t xQueue;
#define MAX_TIMINGS 85
void ds18b20_init() {
gpio_init(DS18B20_PIN);
gpio_set_dir(DS18B20_PIN, GPIO_OUT);
gpio_put(DS18B20_PIN, 1); // 上拉电阻
}
void ds18b20_write_bit(uint8_t bit) {
gpio_set_dir(DS18B20_PIN, GPIO_OUT);
gpio_put(DS18B20_PIN, 0);
sleep_us(bit ? 10 : 60);
gpio_put(DS18B20_PIN, 1);
sleep_us(bit ? 55 : 5);
}
uint8_t ds18b20_read_bit() {
uint8_t bit = 0;
gpio_set_dir(DS18B20_PIN, GPIO_OUT);
gpio_put(DS18B20_PIN, 0);
sleep_us(3);
gpio_set_dir(DS18B20_PIN, GPIO_IN);
sleep_us(10);
bit = gpio_get(DS18B20_PIN);
sleep_us(50);
return bit;
}
void ds18b20_write_byte(uint8_t byte) {
for (int i = 0; i < 8; i++) {
ds18b20_write_bit(byte & 0x01);
byte >>= 1;
}
}
uint8_t ds18b20_read_byte() {
uint8_t byte = 0;
for (int i = 0; i < 8; i++) {
byte >>= 1;
if (ds18b20_read_bit()) {
byte |= 0x80;
}
}
return byte;
}
int ds18b20_reset() {
gpio_set_dir(DS18B20_PIN, GPIO_OUT);
gpio_put(DS18B20_PIN, 0);
sleep_us(480);
gpio_put(DS18B20_PIN, 1);
gpio_set_dir(DS18B20_PIN, GPIO_IN);
sleep_us(70);
int presence = !gpio_get(DS18B20_PIN);
sleep_us(410);
return presence;
}
float ds18b20_read_temperature() {
if (!ds18b20_reset()) {
printf("DS18B20 not found\n");
return -1;
}
ds18b20_write_byte(0xCC); // 跳过ROM指令
ds18b20_write_byte(0x44); // 启动温度转换
sleep_ms(750); // 温度转换时间,具体时间请参考传感器数据手册
if (!ds18b20_reset()) {
printf("DS18B20 not found\n");
return -1;
}
ds18b20_write_byte(0xCC); // 跳过ROM指令
ds18b20_write_byte(0xBE); // 读取暂存器
uint8_t lsb = ds18b20_read_byte();
uint8_t msb = ds18b20_read_byte();
int16_t temp = (msb << 8) | lsb;
// 检查传感器数据有效性
if (temp == 0xFFFF) {
printf("Invalid temperature data\n");
return -1;
}
return temp / 16.0; // 转换为摄氏度
}
// 温度传感器
void DS18B20(void *pvParameters)
{
// One_wire 第三方库方法
float TEMPERATURE = -1;
One_wire one_wire(DS18B20_PIN);
one_wire.init();
rom_address_t address {
};
_printTaskStackHighWaterMark("DS18B20");
while (1) {
one_wire.single_device_read_rom(address);
one_wire.convert_temperature(address, true, false);
TEMPERATURE = one_wire.temperature(address);
sleep_ms(300);
printf("Device Address: %02x%02x%02x%02x%02x%02x%02x%02x DS18B20 Temperature: %3.1f°C\n", address.rom[0], address.rom[1], address.rom[2], address.rom[3], address.rom[4], address.rom[5], address.rom[6], address.rom[7], one_wire.temperature(address));
if (TEMPERATURE != 85) {
char TEMPERATURE_TEMP[256] = { 0 };
sprintf(TEMPERATURE_TEMP, "Temperature: %.3f°C\n", TEMPERATURE);
_HC_12(TEMPERATURE_TEMP);
//TEMPERATURE = -1;
}
// 发送数据到队列
xQueueSend(xQueue, &TEMPERATURE, portMAX_DELAY);
vTaskDelay(pdMS_TO_TICKS(1000));
_printTaskStackHighWaterMark("DS18B20");
watchdog_update(); // 喂狗
vTaskDelay(pdMS_TO_TICKS(3000)); // 非阻塞延时
}
/*
ds18b20_init();
while (1) {
float temperature = ds18b20_read_temperature();
if (temperature != -1) {
printf("DS18B20 Temperature: %.2f°C\n", temperature);
} else {
printf("Failed to read temperature\n");
}
watchdog_update(); // 喂狗
vTaskDelay(pdMS_TO_TICKS(3000)); // 非阻塞延时
}
*/
return;
}