STM32F103C8T6读取DHT11温湿度代码如何编写

以下是一个简单的STM32F103C8T6读取DHT11温湿度的代码示例：

#include "stm32f10x.h"

#define DHT11_GPIO GPIOB
#define DHT11_PIN GPIO_Pin_8

void delay_us(uint32_t us) {
    SysTick->LOAD = us * 9;
    SysTick->VAL = 0;
    SysTick->CTRL = SysTick_CTRL_ENABLE_Msk;

    while(!(SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk));
}

void DHT11_start(void) {
    GPIO_InitTypeDef GPIO_InitStruct;

    GPIO_InitStruct.GPIO_Pin = DHT11_PIN;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_Init(DHT11_GPIO, &GPIO_InitStruct);

    GPIO_ResetBits(DHT11_GPIO, DHT11_PIN);
    delay_us(18000);
    GPIO_SetBits(DHT11_GPIO, DHT11_PIN);
    delay_us(40);
}

uint8_t DHT11_read_bit(void) {
    uint8_t result;

    GPIO_InitTypeDef GPIO_InitStruct;

    GPIO_InitStruct.GPIO_Pin = DHT11_PIN;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_Init(DHT11_GPIO, &GPIO_InitStruct);

    GPIO_ResetBits(DHT11_GPIO, DHT11_PIN);
    delay_us(40);
    GPIO_SetBits(DHT11_GPIO, DHT11_PIN);
    delay_us(10);

    GPIO_InitStruct.GPIO_Pin = DHT11_PIN;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_Init(DHT11_GPIO, &GPIO_InitStruct);

    delay_us(10);

    result = GPIO_ReadInputDataBit(DHT11_GPIO, DHT11_PIN);

    while(GPIO_ReadInputDataBit(DHT11_GPIO, DHT11_PIN));

    return result;
}

uint8_t DHT11_read_byte(void) {
    uint8_t i, result = 0;

    for(i = 0; i < 8; i++) {
        result <<= 1;
        result |= DHT11_read_bit();
    }

    return result;
}

uint8_t DHT11_read_data(uint8_t *data) {
    uint8_t i;

    DHT11_start();

    if(GPIO_ReadInputDataBit(DHT11_GPIO, DHT11_PIN)) {
        return 0;
    }

    while(!GPIO_ReadInputDataBit(DHT11_GPIO, DHT11_PIN));

    while(GPIO_ReadInputDataBit(DHT11_GPIO, DHT11_PIN));

    for(i = 0; i < 5; i++) {
        data[i] = DHT11_read_byte();
    }

    if(data[4] == (data[0] + data[1] + data[2] + data[3])) {
        return 1;
    } else {
        return 0;
    }
}

int main(void) {
    uint8_t data[5];

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

    while(1) {
        if(DHT11_read_data(data)) {
            printf("Temperature: %d.%dC, Humidity: %d.%d%%\n", data[2], data[3], data[0], data[1]);
        } else {
            printf("Read error!\n");
        }

        delay_us(2000000);
    }
}

需要注意的是，这只是一个简单的示例，并不能保证100%的准确性。实际应用中，还需要进行更多的优化和测试。