STM32F103C8T6串口程序

以下是一个简单的STM32F103C8T6串口程序，使用USART1和PA9/PA10引脚进行通信。本例程使用的是HAL库。

首先，需要在STM32CubeMX中配置USART1和GPIO引脚。在Pinout & Configuration选项卡中，选择USART1，并将其配置为Asynchronous mode。然后，在PA9和PA10中选择Alternate Function并将其配置为USART1_TX和USART1_RX。

接下来，在代码中添加以下头文件：

#include "stm32f1xx_hal.h"
#include "stdio.h"

然后，在main函数中初始化USART1：

// 初始化HAL库
HAL_Init();

// 使能外设时钟
__HAL_RCC_USART1_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();

// 配置GPIO引脚
GPIO_InitTypeDef GPIO_InitStruct = {0};
GPIO_InitStruct.Pin = GPIO_PIN_9;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

// 配置USART1
UART_HandleTypeDef huart1 = {0};
huart1.Instance = USART1;
huart1.Init.BaudRate = 115200;
huart1.Init.WordLength = UART_WORDLENGTH_8B;
huart1.Init.StopBits = UART_STOPBITS_1;
huart1.Init.Parity = UART_PARITY_NONE;
huart1.Init.Mode = UART_MODE_TX_RX;
huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
HAL_UART_Init(&huart1);

现在可以通过USART1发送和接收数据了：

// 发送数据
char buffer[32];
sprintf(buffer, "Hello, World!\r\n");
HAL_UART_Transmit(&huart1, (uint8_t*)buffer, strlen(buffer), HAL_MAX_DELAY);

// 接收数据
char receivedData[1];
HAL_UART_Receive(&huart1, (uint8_t*)receivedData, 1, HAL_MAX_DELAY);

完整程序如下：

#include "stm32f1xx_hal.h"
#include "stdio.h"

int main(void)
{
  // 初始化HAL库
  HAL_Init();

  // 使能外设时钟
  __HAL_RCC_USART1_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();

  // 配置GPIO引脚
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  GPIO_InitStruct.Pin = GPIO_PIN_9;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  // 配置USART1
  UART_HandleTypeDef huart1 = {0};
  huart1.Instance = USART1;
  huart1.Init.BaudRate = 115200;
  huart1.Init.WordLength = UART_WORDLENGTH_8B;
  huart1.Init.StopBits = UART_STOPBITS_1;
  huart1.Init.Parity = UART_PARITY_NONE;
  huart1.Init.Mode = UART_MODE_TX_RX;
  huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  HAL_UART_Init(&huart1);

  // 发送数据
  char buffer[32];
  sprintf(buffer, "Hello, World!\r\n");
  HAL_UART_Transmit(&huart1, (uint8_t*)buffer, strlen(buffer), HAL_MAX_DELAY);

  // 接收数据
  char receivedData[1];
  HAL_UART_Receive(&huart1, (uint8_t*)receivedData, 1, HAL_MAX_DELAY);
}