整个HAL库工程里面找不到UART9和UART10的配置说明，那UART9和UART10怎么使用呢？大家谁用过UART9和UART10，知道怎么回事吗

yuanzinpl

整个HAL库工程里面找不到UART9和UART10的配置说明，那UART9和UART10怎么使用呢？大家谁用过UART9和UART10，知道怎么回事吗

yuanzinpl

找到原因了,HAL库函数中没有考虑UART9和UART10这两种串口的情形，只把USART1和USART6按照所在的APB2时钟设置波特率了，UART9和UART10也在APB2时钟下面。但是没考虑UART9和UART10，程序中除了USART1和USART6，其他串口都按照最后的else情况 ，按照APB1时钟设置了，时钟差别2倍关系，BRR按照APB1设置，实际UART9，UART10时钟确是APB2，所以波特率也是2倍关系。详情查看UART_SetConfig(UART_HandleTypeDef *huart)
iif(huart->Init.OverSampling == UART_OVERSAMPLING_8)  {
    /*-------------------------- USART BRR Configuration ---------------------*/
#if defined(USART6)
    if((huart->Instance == USART1) || (huart->Instance == USART6))
    {
      huart->Instance->BRR = UART_BRR_SAMPLING8(HAL_RCC_GetPCLK2Freq(), huart->Init.BaudRate);
    }
#else
    if(huart->Instance == USART1)
    {
      huart->Instance->BRR = UART_BRR_SAMPLING8(HAL_RCC_GetPCLK2Freq(), huart->Init.BaudRate);
    }      
#endif /* USART6 */
    else
    {
      huart->Instance->BRR = UART_BRR_SAMPLING8(HAL_RCC_GetPCLK1Freq(), huart->Init.BaudRate);
    }
  }
  else
  {
    /*-------------------------- USART BRR Configuration ---------------------*/
#if defined(USART6)
    if((huart->Instance == USART1) || (huart->Instance == USART6))
    {
      huart->Instance->BRR = UART_BRR_SAMPLING16(HAL_RCC_GetPCLK2Freq(), huart->Init.BaudRate);
    }
#else
    if(huart->Instance == USART1)
    {
      huart->Instance->BRR = UART_BRR_SAMPLING16(HAL_RCC_GetPCLK2Freq(), huart->Init.BaudRate);
    }      
#endif /* USART6 */
    else
    {
      huart->Instance->BRR = UART_BRR_SAMPLING16(HAL_RCC_GetPCLK1Freq(), huart->Init.BaudRate);
    }
  }

USART1    APB2

USART2    APB1

USART3    APB1

UART4      APB1

UART5      APB1

USART6   APB2

UART7      APB1

UART8      APB1

UART9      APB2

UART10     APB2


根据串口初始化函数推测，HAL库函数确是没有专门针对UAR9，UART10进行设置
大部分参数This parameter can be UARTx where x: 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or   *         UART peripheral.
但是一些串口的库函数是可以用的，只不过要注意类似波特率设置的BUG，修正这些BUG后，UART9，UART10也是可以按照这些库函数操作的

后来发现STM32CUBE生成的UART9代码工程中对应的HAL库函数就增加了UART9，UART10这两种串口如下
static void UART_SetConfig(UART_HandleTypeDef *huart)
{
  uint32_t tmpreg;
  uint32_t pclk;
  /* Check the parameters */
  assert_param(IS_UART_BAUDRATE(huart->Init.BaudRate));
  assert_param(IS_UART_STOPBITS(huart->Init.StopBits));
  assert_param(IS_UART_PARITY(huart->Init.Parity));
  assert_param(IS_UART_MODE(huart->Init.Mode));
  /*-------------------------- USART CR2 Configuration -----------------------*/
  /* Configure the UART Stop Bits: Set STOP[13:12] bits
     according to huart->Init.StopBits value */
  MODIFY_REG(huart->Instance->CR2, USART_CR2_STOP, huart->Init.StopBits);
  /*-------------------------- USART CR1 Configuration -----------------------*/
  /* Configure the UART Word Length, Parity and mode:
     Set the M bits according to huart->Init.WordLength value
     Set PCE and PS bits according to huart->Init.Parity value
     Set TE and RE bits according to huart->Init.Mode value
     Set OVER8 bit according to huart->Init.OverSampling value */
  tmpreg = (uint32_t)huart->Init.WordLength | huart->Init.Parity | huart->Init.Mode | huart->Init.OverSampling;
  MODIFY_REG(huart->Instance->CR1,
             (uint32_t)(USART_CR1_M | USART_CR1_PCE | USART_CR1_PS | USART_CR1_TE | USART_CR1_RE | USART_CR1_OVER8),
             tmpreg);
  /*-------------------------- USART CR3 Configuration -----------------------*/
  /* Configure the UART HFC: Set CTSE and RTSE bits according to huart->Init.HwFlowCtl value */
  MODIFY_REG(huart->Instance->CR3, (USART_CR3_RTSE | USART_CR3_CTSE), huart->Init.HwFlowCtl);

#if defined(USART6) && defined(UART9) && defined(UART10)
    if ((huart->Instance == USART1) || (huart->Instance == USART6) || (huart->Instance == UART9) || (huart->Instance == UART10))
    {
      pclk = HAL_RCC_GetPCLK2Freq();
    }
#elif defined(USART6)
    if ((huart->Instance == USART1) || (huart->Instance == USART6))
    {
      pclk = HAL_RCC_GetPCLK2Freq();
    }
#else
    if (huart->Instance == USART1)
    {
      pclk = HAL_RCC_GetPCLK2Freq();
    }
#endif /* USART6 */
    else
    {
      pclk = HAL_RCC_GetPCLK1Freq();
    }
  /*-------------------------- USART BRR Configuration ---------------------*/
  if (huart->Init.OverSampling == UART_OVERSAMPLING_8)
  {
    huart->Instance->BRR = UART_BRR_SAMPLING8(pclk, huart->Init.BaudRate);
  }
  else
  {
    huart->Instance->BRR = UART_BRR_SAMPLING16(pclk, huart->Init.BaudRate);
  }
}

lpwithv

串口配置都差不多，不清楚的可以网上找案例

peng1554

yuanzinpl 发表于 2021-9-10 13:47
找到原因了,HAL库函数中没有考虑UART9和UART10这两种串口的情形，只把USART1和USART6按照所在的APB2时钟设 ...

感谢踩坑