[STM8] STM32CubeMX USART串口DMA，IDLE 空闲中断接收不定长接收详解

if (HAL_UART_Receive_DMA(&huart1, (uint8_t *)aRxBuffer, RXBUFFERSIZE) != HAL_OK)

{

/* Transfer error in reception process */

Error_Handler();

}

__HAL_UART_ENABLE_IT(&huart1,UART_IT_IDLE);



//添加      #define RXBUFFERSIZE 50



//添加      uint8_t aRxBuffer[RXBUFFERSIZE];



/***************************下面添加printf第一段***************/



#ifdef __GNUC__

/* With GCC, small printf (option LD Linker->Libraries->Small printf

set to 'Yes') calls __io_putchar() */

#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)

#else

#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)

#endif /* __GNUC__ */



/***************************下面添加printf第二段***************/



PUTCHAR_PROTOTYPE

{

/* Place your implementation of fputc here */

/* e.g. write a character to the USART1 and Loop until the end of transmission */

HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 1, 0xFFFF);



return ch;

}

/***************************下面main.h内添加函数声明***************/



void HAL_UART_IdleCallback(UART_HandleTypeDef*huart);



 /***************************下面main.c内添加库函数***************/ 



#include "string.h"

#include "stdio.h"



 /***************************下面main.c内添加编写的回调函数***************/



void HAL_UART_IdleCallback(UART_HandleTypeDef*huart)

{

//清除标志位

__HAL_UART_CLEAR_IDLEFLAG(huart);

//停止DMA接收

HAL_UART_DMAStop(huart);

//返回发送回的数据

printf("%s",aRxBuffer);

printf("Helloorld!\n");

//清除缓存区

memset(aRxBuffer,0x00,50);

//开始DMA接收

if(HAL_UART_Receive_DMA(huart,(uint8_t*)aRxBuffer,RXBUFFERSIZE)!=HAL_OK)

{

Error_Handler();

}



}



 /***********下面stm32f4xx_it.c内void USART1_IRQHandler(void)中添加编写的回调函数***************/ 



if(__HAL_UART_GET_FLAG(&huart1,UART_FLAG_IDLE)!=RESET)

{



//        HAL_UART_IdleCallback(&huart1);

HAL_UART_IdleCallback(&huart1); // HAL_IdleCallback(UART_HandleTypeDef*huart);        

}