stm32串口源码

以下是stm32串口的C语言源代码示例，仅供参考：

#include "stm32f10x.h"
#include <stdio.h>

void USART1_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  USART_InitTypeDef USART_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_USART1, ENABLE);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  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_Tx | USART_Mode_Rx;
  USART_Init(USART1, &USART_InitStructure);

  USART_Cmd(USART1, ENABLE);
}

void USART1_SendChar(char ch)
{
  while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);

  USART_SendData(USART1, (uint16_t)ch);
}

void USART1_SendString(char *str)
{
  while (*str)
  {
    USART1_SendChar(*str++);
  }
}

int fputc(int ch, FILE *f)
{
  USART1_SendChar(ch);

  return ch;
}

int fgetc(FILE *f)
{
  while (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET);

  return USART_ReceiveData(USART1);
}

该示例代码使用了USART1进行串口通信，波特率为115200，使用了PA9和PA10作为USART1的TX和RX引脚。USART1_SendChar和USART1_SendString函数可以用来发送数据，fputc和fgetc函数可以用来重定向stdio库，从而实现printf和scanf等标准输入输出函数的使用。