STM32F051C8 DHT11 串口打印

好的，我可以为您提供一些相关的代码和解释。首先，您需要连接STM32F051C8和DHT11。DHT11的数据线连接到STM32F051C8的GPIO引脚上，您可以根据需要选择合适的GPIO引脚，同时还需要将DHT11的VCC和GND分别连接到STM32F051C8的电源和地线上。

接下来，您需要编写STM32F051C8的代码来读取DHT11传感器的数据。以下是一个简单的代码示例，使用USART1将数据打印到串口：

#include "stm32f0xx.h"

#define DHT11_PIN GPIO_Pin_0
#define DHT11_PORT GPIOA
#define DHT11_RCC RCC_AHBPeriph_GPIOA

#define USART_TX_PIN GPIO_Pin_9
#define USART_TX_PORT GPIOA
#define USART_TX_RCC RCC_AHBPeriph_GPIOA
#define USART_RX_PIN GPIO_Pin_10
#define USART_RX_PORT GPIOA
#define USART_RX_RCC RCC_AHBPeriph_GPIOA
#define USART USART1
#define USART_RCC RCC_APB2Periph_USART1

void delay_us(uint32_t us) {
    SysTick->LOAD = us * (SystemCoreClock / 1000000);
    SysTick->VAL = 0;
    SysTick->CTRL = SysTick_CTRL_ENABLE_Msk;
    while ((SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk) == 0);
    SysTick->CTRL = 0;
}

void delay_ms(uint32_t ms) {
    SysTick->LOAD = ms * (SystemCoreClock / 1000);
    SysTick->VAL = 0;
    SysTick->CTRL = SysTick_CTRL_ENABLE_Msk;
    while ((SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk) == 0);
    SysTick->CTRL = 0;
}

void USART1_Init(void) {
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;
    
    RCC_AHBPeriphClockCmd(USART_TX_RCC | USART_RX_RCC, ENABLE);
    RCC_APB2PeriphClockCmd(USART_RCC, ENABLE);
    
    GPIO_InitStructure.GPIO_Pin = USART_TX_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(USART_TX_PORT, &GPIO_InitStructure);
    
    GPIO_InitStructure.GPIO_Pin = USART_RX_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(USART_RX_PORT, &GPIO_InitStructure);
    
    GPIO_PinAFConfig(USART_TX_PORT, GPIO_PinSource9, GPIO_AF_1);
    GPIO_PinAFConfig(USART_RX_PORT, GPIO_PinSource10, GPIO_AF_1);
    
    USART_InitStructure.USART_BaudRate = 9600;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
    USART_Init(USART, &USART_InitStructure);
    
    USART_Cmd(USART, ENABLE);
}

void USART1_SendChar(char c) {
    while (USART_GetFlagStatus(USART, USART_FLAG_TXE) == RESET);
    USART_SendData(USART, c);
    while (USART_GetFlagStatus(USART, USART_FLAG_TC) == RESET);
}

void DHT11_Init(void) {
    GPIO_InitTypeDef GPIO_InitStructure;
    
    RCC_AHBPeriphClockCmd(DHT11_RCC, ENABLE);
    
    GPIO_InitStructure.GPIO_Pin = DHT11_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(DHT11_PORT, &GPIO_InitStructure);
    
    GPIO_SetBits(DHT11_PORT, DHT11_PIN);
    delay_ms(100);
}

uint8_t DHT11_ReadByte(void) {
    uint8_t i, data = 0;
    
    for (i = 0; i < 8; i++) {
        while (GPIO_ReadInputDataBit(DHT11_PORT, DHT11_PIN) == RESET);
        delay_us(30);
        if (GPIO_ReadInputDataBit(DHT11_PORT, DHT11_PIN) == SET) {
            data |= (1 << (7 - i));
        }
        while (GPIO_ReadInputDataBit(DHT11_PORT, DHT11_PIN) == SET);
    }
    
    return data;
}

void DHT11_ReadData(uint8_t *temp, uint8_t *humidity) {
    uint8_t data[5], i;
    
    GPIO_ResetBits(DHT11_PORT, DHT11_PIN);
    delay_ms(18);
    GPIO_SetBits(DHT11_PORT, DHT11_PIN);
    delay_us(30);
    GPIO_SetBits(DHT11_PORT, DHT11_PIN);
    delay_us(30);
    
    if (GPIO_ReadInputDataBit(DHT11_PORT, DHT11_PIN) == RESET) {
        while (GPIO_ReadInputDataBit(DHT11_PORT, DHT11_PIN) == RESET);
        while (GPIO_ReadInputDataBit(DHT11_PORT, DHT11_PIN) == SET);
        
        for (i = 0; i < 5; i++) {
            data[i] = DHT11_ReadByte();
        }
        
        if ((data[0] + data[1] + data[2] + data[3]) == data[4]) {
            *humidity = data[0];
            *temp = data[2];
        }
    }
}

int main(void) {
    uint8_t temp, humidity;
    
    SystemCoreClockUpdate();
    SysTick_Config(SystemCoreClock / 1000);
    USART1_Init();
    DHT11_Init();
    
    while (1) {
        DHT11_ReadData(&temp, &humidity);
        
        USART1_SendChar('T');
        USART1_SendChar(':');
        USART1_SendChar(temp);
        USART1_SendChar('\r');
        USART1_SendChar('\n');
        
        USART1_SendChar('H');
        USART1_SendChar(':');
        USART1_SendChar(humidity);
        USART1_SendChar('\r');
        USART1_SendChar('\n');
        
        delay_ms(1000);
    }
}

这个代码示例中，我们使用了USART1来打印数据到串口，使用了SysTick延时函数和DHT11的读取函数。在主函数中，我们不断地读取DHT11的温湿度数据，并将其打印到串口上。注意，在打印数据时，我们使用了一些特殊的字符，如'\r'和'\n'，它们代表回车和换行符。

当您将程序烧录到STM32F051C8上并运行时，您应该能够在串口终端上看到来自DHT11传感器的温湿度数据。