STM32 HAL rx中断无法正确获取字节 [英] STM32 HAL rx interrupt can't get bytes correctly

问题描述

我正在尝试使用stm32 HAL库进行串行rx中断，但出现了我不知道的错误.

Hi guys I am trying to make serial rx interrupt using stm32 HAL library and I got error what I dont know.

这真的很简单. PC将字节提供给stm32板，并且stm32将使用rx中断例程获取这些字节.

It is really simple program. PC gives bytes to stm32 board and stm32 will take those bytes using rx interrupt routine.

问题是当我发送4个字节(例如"12345")时，stm32板只有4个字节，最后一个byte(5)消失了.这是更好理解的图片.

Problem is when i send over 4 bytes ,such as "12345", stm32 board only got 4 bytes and last one byte(5) is gone somewhere. Here is picture for better understanding.

这是我在HAL_UART_RxCpltCallback例程中的代码:

Here is my code in HAL_UART_RxCpltCallback routine:

HAL_UART_Transmit(&huart4, &receive1, 1, 1000);
HAL_UART_Receive_IT(&huart4, &receive1, 1);

如果您有任何想法，请发表评论:)

If you have any idea, please comment :)

推荐答案

检查功能:HAL_UART_Receive_IT(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size);

1. 使大小足够长，例如16字节；

2. 调用HAL_UART_RxCpltCallback例程进入函数HAL_UART_Receive_IT(...).我建议您像这样添加结束字符(\n)检测:

1. make a size enough longer like 16bytes for example;

2. call your HAL_UART_RxCpltCallback routine into the function HAL_UART_Receive_IT(...). I suggest to you to add an end character (\n) detection like this:

if ( (*huart->pRxBuffPtr) == '\n') {
    HAL_UART_RxCpltCallback(huart);  //-------------------------------------------/////////
} else {
    huart->pRxBuffPtr++;
}

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