keil5接收数据代码

以下是使用Keil5接收数据的代码示例：

#include <stdio.h>
#include <stm32f4xx.h>
#include <stm32f4xx_usart.h>

#define USARTx USART2

void USART_Configuration(void)
{
    USART_InitTypeDef USART_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;
    
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
    
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_USART2);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_USART2);
    
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
    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(GPIOA, &GPIO_InitStructure);
    
    USART_InitStructure.USART_BaudRate = 115200;
    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_Rx | USART_Mode_Tx;
    USART_Init(USARTx, &USART_InitStructure);
    
    USART_Cmd(USARTx, ENABLE);
}

int main()
{
    USART_Configuration();
    
    while (1)
    {
        while (USART_GetFlagStatus(USARTx, USART_FLAG_RXNE) == RESET);
        uint8_t data = USART_ReceiveData(USARTx);
        printf("Received data: %c\n", data);
    }
}

这个示例代码配置了USART2作为串口，使用GPIOA的引脚2和3作为TX和RX线，波特率为115200。在主函数中，使用while循环不断接收USART接收缓冲区中的数据，并打印出来。