stm32f103c8t6通过PA12读取dht11温湿度传感器温湿度

好的，这里提供一个简单的示例代码，使用STM32F103C8T6的PA12与DHT11温湿度传感器进行数据读取：

#include "stm32f10x.h"

#define DHT11_PORT GPIOA
#define DHT11_PIN GPIO_Pin_12

void delay_us(uint16_t us)
{
    uint16_t i;
    while (us--) {
        i = 8;
        while (i--);
    }
}

void DHT11_Start(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = DHT11_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_Init(DHT11_PORT, &GPIO_InitStructure);

    GPIO_SetBits(DHT11_PORT, DHT11_PIN);
    delay_us(40);
    GPIO_ResetBits(DHT11_PORT, DHT11_PIN);
    delay_us(18);
    GPIO_SetBits(DHT11_PORT, DHT11_PIN);
    delay_us(40);
}

uint8_t DHT11_Check_Response(void)
{
    uint16_t retry = 0;

    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = DHT11_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_Init(DHT11_PORT, &GPIO_InitStructure);

    while (GPIO_ReadInputDataBit(DHT11_PORT, DHT11_PIN) && retry < 100) {
        delay_us(1);
        retry++;
    }

    if (retry >= 100) {
        return 1;
    }
    else {
        retry = 0;
    }

    while (!GPIO_ReadInputDataBit(DHT11_PORT, DHT11_PIN) && retry < 100) {
        delay_us(1);
        retry++;
    }

    if (retry >= 100) {
        return 1;
    }
    else {
        return 0;
    }
}

uint8_t DHT11_Read_Bit(void)
{
    uint16_t retry = 0;

    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = DHT11_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_Init(DHT11_PORT, &GPIO_InitStructure);

    while (!GPIO_ReadInputDataBit(DHT11_PORT, DHT11_PIN) && retry < 100) {
        delay_us(1);
        retry++;
    }

    if (retry >= 100) {
        return 0;
    }
    else {
        retry = 0;
    }

    while (GPIO_ReadInputDataBit(DHT11_PORT, DHT11_PIN) && retry < 100) {
        delay_us(1);
        retry++;
    }

    if (retry >= 100) {
        return 0;
    }
    else {
        delay_us(40);
        return GPIO_ReadInputDataBit(DHT11_PORT, DHT11_PIN);
    }
}

uint8_t DHT11_Read_Byte(void)
{
    uint8_t i, j;
    uint8_t byte = 0;

    for (i = 0; i < 8; i++) {
        j = DHT11_Read_Bit();
        byte = (byte << 1) + j;
    }

    return byte;
}

void DHT11_Read_Data(uint8_t *hum, uint8_t *temp)
{
    uint8_t buf[5] = {0};
    uint8_t i;

    DHT11_Start();

    if (DHT11_Check_Response()) {
        return;
    }

    for (i = 0; i < 5; i++) {
        buf[i] = DHT11_Read_Byte();
    }

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

int main(void)
{
    uint8_t hum, temp;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    while (1) {
        DHT11_Read_Data(&hum, &temp);
        delay_us(1000000);

        // Do something with hum and temp
    }

    return 0;
}

这段代码通过STM32的GPIO口PA12与DHT11进行通信，实现了从DHT11读取温湿度数据的功能。在主函数中，通过反复调用`DHT11_Read_Data`函数，可以不断读取DHT11传感器的温湿度数据，并进行相应的处理。