STM32的485通讯

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jiaxinhui| 中级工程师

楼主 | 2011-7-11 16:50 | 只看该作者 |只看大图回帖奖励

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通讯, STM32, pi, GPIO, IO

void UART3Init(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      USART_InitTypeDef USART_InitStructure;
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);//使能外设时钟
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 ;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
      GPIO_Init(GPIOC, &GPIO_InitStructure);

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
      GPIO_Init(GPIOB, &GPIO_InitStructure);
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
      GPIO_Init(GPIOB, &GPIO_InitStructure);
      USART_InitStructure.USART_BaudRate = 9600;
      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_Tx | USART_Mode_Rx;
      USART_Init(USART3, &USART_InitStructure);
      USART_Cmd(USART3, ENABLE);
}

void UART3SendByte(unsigned char SendData)
{ Set_DE;
Set_RE;DelayNmS(1);
      USART_SendData(USART3,SendData);
      while(USART_GetFlagStatus(USART3, USART_FLAG_TXE) == RESET);
  DelayNmS(1);
Clr_DE;
Clr_RE;
}

unsigned char UART3GetByte(unsigned char* GetData)
{
   Clr_DE;
Clr_RE;DelayNmS(1);
      if(USART_GetFlagStatus(USART3, USART_FLAG_RXNE) == RESET)
      {
            return 0;//没有收到数据
      }
      *GetData = USART_ReceiveData(USART3);
DelayNmS(1);
Set_DE;
Set_RE;
      return 1;//收到数据
}
void RS485_Test(void)
{
      unsigned char i = 0;
unsigned char a = 0;
   while(1)
   {

   while(UART3GetByte(&i))
            { UART3SendByte(i);
         if(i==0x01){  LedOutput(0,1);}
   if(i==0x02){  LedOutput(1,1);}
   if(i==0x03){  LedOutput(2,1); }
   if(i==0x04){  LedOutput(0,0); LedOutput(1,0);  LedOutput(2,0);}
            }



      }

}

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