stm32f407IGT6串口问题

1万 · 2018-1-17 13:56

最近做一个项目，使用407用到多个串口，串口一，二正常，串口三，六波特率不对，找了半天也沒发现问题，哪位大侠
遇到过？

只看该作者 · 2018-1-17 14:12

自己用LL库写的还是 CubeMX生成的？自己配置的仔细看下时钟的配置吧，你这么表述别人也很难具体分析原因的

1万 · 2018-1-17 14:17

串口一六用的同一个时钟，串口二三用的同一个时钟，如果是时钟配置不对，串口一二应该也不正常才对

只看该作者 · 2018-1-17 14:30

btiger2000 发表于 2018-1-17 14:17
串口一六用的同一个时钟，串口二三用的同一个时钟，如果是时钟配置不对，串口一二应该也不正常才对

...

你要这么说那就是对的肯定是你看错了
你这种得把实际东西贴出来啊不然不都是猜吗对结果毫无意义啊

1万 · 2018-1-17 14:55

初始化代码如下：

UARTn_Init(COM1,115200);
UARTn_Init(COM2,115200);
UARTn_Init(COM3,115200);
UARTn_Init(COM6,115200);

void UARTn_Init(COMn_TypeDef COM,uint32_t BaudRate)
{
  GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;


/* Enable GPIO clock */
  RCC_AHB1PeriphClockCmd(COM_TX_PORT_CLK[COM] | COM_RX_PORT_CLK[COM], ENABLE);

  if (COM == COM1 ||COM == COM6)
  {
/* Enable UART clock */
RCC_APB2PeriphClockCmd(COM_USART_CLK[COM], ENABLE);
  }
  else
  {
/* Enable UART clock */
RCC_APB1PeriphClockCmd(COM_USART_CLK[COM], ENABLE);
  }

/* USARTx configured as follow:
      - BaudRate = 115200 baud
      - Word Length = 8 Bits
      - One Stop Bit
      - No parity
      - Hardware flow control disabled (RTS and CTS signals)
      - Receive and transmit enabled
  */
  USART_InitStructure.USART_BaudRate = 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;

/* USART configuration */
  USART_Init(COM_USART[COM], &USART_InitStructure);


  /* Connect PXx to USARTx_Tx*/
  GPIO_PinAFConfig(COM_TX_PORT[COM], COM_TX_PIN_SOURCE[COM], COM_TX_AF[COM]);

  /* Connect PXx to USARTx_Rx*/
  GPIO_PinAFConfig(COM_RX_PORT[COM], COM_RX_PIN_SOURCE[COM], COM_RX_AF[COM]);

  /* Configure USART Tx as alternate function  */
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

  GPIO_InitStructure.GPIO_Pin = COM_TX_PIN[COM];
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(COM_TX_PORT[COM], &GPIO_InitStructure);

  /* Configure USART Rx as alternate function  */
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Pin = COM_RX_PIN[COM];
  GPIO_Init(COM_RX_PORT[COM], &GPIO_InitStructure);



Buf_Fifo_Init(COM);

  /* Enable USART */
  USART_Cmd(COM_USART[COM], ENABLE);
USART_ClearFlag(COM_USART[COM],USART_FLAG_TC);
USARTn_Int_Init(COM);
}