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