STM32G070 移植一个shell，方便调试。基于FreeRTOS

测试ST 官网的 FreeRTOS

移植shell
主要是串口对接, 需要重写两个函数

int fputc(int ch, FILE *f)
{
  /* Place your implementation of fputc here */
  /* e.g. write a character to the EVAL_COM1 and Loop until the end of transmission */
  HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 1, UART_TIMEOUT_VALUE);
  return ch;
}
// #endif

char shell_buf[RXBUFFERSIZE]={0};
char shell_len=0;
char *shell_buf_head=NULL;


int fgetc(FILE *f)
{

  while (0 == shell_len) {
    osDelay(1);
  }
  char ch = *shell_buf_head;
  shell_buf_head ++;
  shell_len --;

  return ch;
}

增加了一个回调函数, 收到数据拷贝到shell_buf,  然后重新初始化串口中断接收参数，指针，size，count

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *UartHandle)
{
  /* Set transmission flag: transfer complete */
  if(UartHandle->Instance == USART1) {
    // UartReady = SET;
    shell_len = UartHandle->pRxBuffPtr - aRxBuffer;
    shell_buf_head = shell_buf;
    memcpy(shell_buf, aRxBuffer, shell_len);

    UartHandle->pRxBuffPtr = aRxBuffer;
    UartHandle->RxXferSize  = RXBUFFERSIZE;
    UartHandle->RxXferCount = RXBUFFERSIZE;
  }

}

遇到的问题， 1. fgetc 不能直接调用HAL_UART_Receive, 否则会死等，导致其他任务无法运行。

解决这个问题的方法是，接收采用中断方式。

问题2. STM32CubeMX 生成的代码，串口中断接收是固定长度的方式， 对于shell 不适用。

解决这个问题的方法是，修改中断处理程序，如果是调试用的串口，直接处理接收数据

static void UART_RxISR_8BIT(UART_HandleTypeDef *huart)
{
  uint16_t uhMask = huart->Mask;
  uint16_t  uhdata;

  /* Check that a Rx process is ongoing */
  if (huart->RxState == HAL_UART_STATE_BUSY_RX)
  {
    uhdata = (uint16_t) READ_REG(huart->Instance->RDR);
    *huart->pRxBuffPtr = (uint8_t)(uhdata & (uint8_t)uhMask);
    huart->pRxBuffPtr++;
    huart->RxXferCount--;

    if(USART1 == huart->Instance) {
      HAL_UART_RxCpltCallback(huart);
    }
    if (huart->RxXferCount == 0U) {
      /* Disable the UART Parity Error Interrupt and RXNE interrupts */
      CLEAR_BIT(huart->Instance->CR1, (USART_CR1_RXNEIE_RXFNEIE | USART_CR1_PEIE));

      /* Disable the UART Error Interrupt: (Frame error, noise error, overrun error) */
      CLEAR_BIT(huart->Instance->CR3, USART_CR3_EIE);

      /* Rx process is completed, restore huart->RxState to Ready */
      huart->RxState = HAL_UART_STATE_READY;

      /* Clear RxISR function pointer */
      huart->RxISR = NULL;

#if (USE_HAL_UART_REGISTER_CALLBACKS == 1)
      /*Call registered Rx complete callback*/
      huart->RxCpltCallback(huart);
#else
      /*Call legacy weak Rx complete callback*/
      HAL_UART_RxCpltCallback(huart);
#endif /* USE_HAL_UART_REGISTER_CALLBACKS */
    }
  }
  else
  {
    /* Clear RXNE interrupt flag */
    __HAL_UART_SEND_REQ(huart, UART_RXDATA_FLUSH_REQUEST);
  }
}

问题3. shell 放在Mgr task里面，由于内存分配128*4 不够导致死机

解决这个问题的方法是，去掉没有用的shell 指令，限制最多支持64条指令。 任务内存分配加大 256*4

最终效果图