ds18b20温度传感器stm32 hal库代码

以下是DS18B20温度传感器的STM32 HAL库代码示例：

#include "stm32f4xx_hal.h"

#define DS18B20_PIN GPIO_PIN_0
#define DS18B20_PORT GPIOA

float ds18b20_read_temperature(void);

void ds18b20_reset(void);
void ds18b20_write_bit(uint8_t bit);
uint8_t ds18b20_read_bit(void);
void ds18b20_write_byte(uint8_t byte);
uint8_t ds18b20_read_byte(void);

void ds18b20_reset(void)
{
    HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_RESET);
    HAL_Delay(480);
    HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_SET);
    HAL_Delay(60);
    while (!HAL_GPIO_ReadPin(DS18B20_PORT, DS18B20_PIN));
    HAL_Delay(420);
}

void ds18b20_write_bit(uint8_t bit)
{
    HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_RESET);
    HAL_Delay(bit ? 6 : 60);
    HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_SET);
    HAL_Delay(bit ? 60 : 6);
}

uint8_t ds18b20_read_bit(void)
{
    uint8_t bit = 0;
    HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_RESET);
    HAL_Delay(6);
    HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_SET);
    HAL_Delay(9);
    bit = HAL_GPIO_ReadPin(DS18B20_PORT, DS18B20_PIN);
    HAL_Delay(55);
    return bit;
}

void ds18b20_write_byte(uint8_t byte)
{
    for (int i = 0; i < 8; i++) {
        ds18b20_write_bit(byte & (1 << i));
    }
}

uint8_t ds18b20_read_byte(void)
{
    uint8_t byte = 0;
    for (int i = 0; i < 8; i++) {
        byte |= ds18b20_read_bit() << i;
    }
    return byte;
}

float ds18b20_read_temperature(void)
{
    ds18b20_reset();
    ds18b20_write_byte(0xCC);
    ds18b20_write_byte(0x44);
    HAL_Delay(750);

    ds18b20_reset();
    ds18b20_write_byte(0xCC);
    ds18b20_write_byte(0xBE);

    uint16_t raw_temperature = ds18b20_read_byte() | (ds18b20_read_byte() << 8);

    int8_t sign = (raw_temperature & 0x8000) ? -1 : 1;
    raw_temperature = (raw_temperature >> 4) & 0x0FFF;

    float temperature = (float) raw_temperature / 16.0f * sign;

    return temperature;
}

int main(void)
{
    HAL_Init();
    __HAL_RCC_GPIOA_CLK_ENABLE();

    GPIO_InitTypeDef GPIO_InitStruct;
    GPIO_InitStruct.Pin = DS18B20_PIN;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD;
    GPIO_InitStruct.Pull = GPIO_PULLUP;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    HAL_GPIO_Init(DS18B20_PORT, &GPIO_InitStruct);

    float temperature = ds18b20_read_temperature();
    // Do something with the temperature value

    while (1);
}