STM32F0 TX，RX反了，STM32 TX/RX SWAP功能

只看该作者 · 2021-8-5 22:21

今天又犯了一次低级错误，STM32F0 TX，RX反了，STM32 TXRXSWAP功能又救了我一次

今天板子回来，串口没反应，知道坏了，估计是TX，RX反了。
但还是记得以前把TX，RX用软件调换过。今天在QQ和人聊，然后也看了库。
stm32f0xx_usart.c中找到下面函数：
/**
  * @brief  Enables or disables the swap Tx/Rx pins.
  * @param  USARTx: where x can be 1 or 2 to select the USART peripheral.
  * @param  NewState: new state of the USARTx TX/RX pins pinout.
  *       This parameter can be:
  *          @ARG ENABLE: The TX and RX pins functions are swapped.
  *          @arg DISABLE: TX/RX pins are used as defined in standard pinout
  * @NOTE This function has to be called before calling USART_Cmd() function.
  * @retval None
  */
void USART_SWAPPinCmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
/* Enable the SWAP feature by setting the SWAP bit in the CR2 register */
USARTx->CR2 |= USART_CR2_SWAP;
  }
  else
  {
/* Disable the SWAP feature by clearing the SWAP bit in the CR2 register */
USARTx->CR2 &= (uint32_t)~((uint32_t)USART_CR2_SWAP);
  }
}

只看该作者 · 2021-8-5 22:23

于是在串口初始化后调用 USART_SWAPPinCmd(COM_USART[COM1], ENABLE);
NVIC_InitTypeDef NVIC_InitStructure;
USART_InitTypeDef USART_InitStructure;
USART_InitStructure.USART_BaudRate = 115200;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
STM_COMInit(COM1, &USART_InitStructure);

USART_SWAPPinCmd(COM_USART[COM1], ENABLE);

串口正常了。
喜欢犯错的朋友们不用犯愁了。哈哈。

附：F1好像没这个功能哦。看控制寄存器 2(USART_CR2)就知道了。