1、任务描述
使用freertos系统实现电脑调试助手和正点原子开发板STM32F103ZET6的串口通信。
2、cubemx设置
3、程序代码
（1）添加usart1.c
#include "usart1.h"
#include "usart.h"
/**********重定义函数**********/
struct __FILE
{
int handle;
};
FILE __stdout;
//定义_sys_exit()以避免使用半主机模式
void _sys_exit(int x)
{
x = x;
}
//重定义fputc函数
int fputc(int ch, FILE *f)
{
while((USART1->SR&0X40)==0);//循环发送,直到发送完毕
USART1->DR = (uint8_t) ch;
return ch;
}
//串口1发送串口屏数据send_data
void UserUart1Send(uint8_t *send_data,uint8_t send_len)
{
while(send_len--)
{
HAL_UART_Transmit(&huart1,send_data++,1,20);
}
}
(2)main.c中
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "usart1.h"
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
uint8_t Buffer[13]="hello world\r\n";
uint8_t pre_rec_buf[10];
uint8_t flag=0;
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
void MX_FREERTOS_Init(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
//接收回调函数---接收气压数值字符
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart){
if(huart==&huart1)
{
// HAL_UART_Receive_IT(&huart1,(uint8_t*)pre_rec_buf,20);
flag=1;
// HAL_UART_Transmit_IT(&huart1,Buffer,sizeof(Buffer),11);
// UserUart1Send(Buffer,sizeof(Buffer));
// memset(pre_rec_buf,0,22);
// count=0;
}
HAL_UART_Receive_IT(&huart1,(uint8_t*)pre_rec_buf,10);
}
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_USART1_UART_Init();
/* USER CODE BEGIN 2 */
HAL_UART_Receive_IT(&huart1,(uint8_t*)pre_rec_buf,10);
/* USER CODE END 2 */
（3）freertos.c中
/* USER CODE END Header_usart_Task02 */
void usart_Task02(void *argument)
{
/* USER CODE BEGIN usart_Task02 */
/* Infinite loop */
for(;;)
{
if(flag==1)
{
UserUart1Send(Buffer,sizeof(Buffer));
flag=0;
}
// osDelay(1);
}
/* USER CODE END usart_Task02 */
}4、调试结果
