用STM32标准库编写dht11温湿度传感器的stm32程序

以下是使用STM32标准库编写DHT11温湿度传感器程序的示例代码，供参考：

#include "stm32f1xx.h"

#define DHT11_PIN GPIO_PIN_0
#define DHT11_PORT GPIOA

void delay_us(uint32_t us)
{
    uint32_t delay = us * (SystemCoreClock / 1000000 / 3);
    while (delay--)
        ;
}

void DHT11_start(void)
{
    GPIO_InitTypeDef GPIO_InitStruct = {0};

    GPIO_InitStruct.Pin = DHT11_PIN;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    HAL_GPIO_Init(DHT11_PORT, &GPIO_InitStruct);

    HAL_GPIO_WritePin(DHT11_PORT, DHT11_PIN, GPIO_PIN_RESET);
    delay_us(18000);
    HAL_GPIO_WritePin(DHT11_PORT, DHT11_PIN, GPIO_PIN_SET);
    delay_us(30);

    GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
    HAL_GPIO_Init(DHT11_PORT, &GPIO_InitStruct);
}

uint8_t DHT11_check_response(void)
{
    uint8_t response = 0;
    delay_us(40);
    if (!HAL_GPIO_ReadPin(DHT11_PORT, DHT11_PIN))
    {
        delay_us(80);
        if (HAL_GPIO_ReadPin(DHT11_PORT, DHT11_PIN))
            response = 1;
        else
            response = -1;
    }

    while (HAL_GPIO_ReadPin(DHT11_PORT, DHT11_PIN))
        ;
    return response;
}

uint8_t DHT11_read_byte(void)
{
    uint8_t byte = 0;
    for (uint8_t i = 0; i < 8; i++)
    {
        byte <<= 1;
        while (!HAL_GPIO_ReadPin(DHT11_PORT, DHT11_PIN))
            ;
        delay_us(40);
        if (HAL_GPIO_ReadPin(DHT11_PORT, DHT11_PIN))
            byte |= 1;
        while (HAL_GPIO_ReadPin(DHT11_PORT, DHT11_PIN))
            ;
    }
    return byte;
}

void DHT11_read_data(uint8_t *temp, uint8_t *hum)
{
    uint8_t data[5] = {0};
    DHT11_start();
    if (DHT11_check_response() == 1)
    {
        data[0] = DHT11_read_byte();
        data[1] = DHT11_read_byte();
        data[2] = DHT11_read_byte();
        data[3] = DHT11_read_byte();
        data[4] = DHT11_read_byte();

        if ((data[0] + data[1] + data[2] + data[3]) == data[4])
        {
            *hum = data[0];
            *temp = data[2];
        }
    }
}

int main(void)
{
    uint8_t temp, hum;

    HAL_Init();
    __HAL_RCC_GPIOA_CLK_ENABLE();

    while (1)
    {
        DHT11_read_data(&temp, &hum);
        // 处理数据
    }
}

该程序使用GPIOA 0号引脚作为DHT11传感器的输入引脚。在程序中，首先定义了DHT11_PIN和DHT11_PORT常量，并编写了延迟函数delay_us()、启动函数DHT11_start()、检测响应函数DHT11_check_response()、读取一字节函数DHT11_read_byte()和读取温湿度数据函数DHT11_read_data()。在主函数中，使用死循环调用DHT11_read_data()函数，读取温湿度数据并进行处理。