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標題: STM32 485串口配置過程串口不斷的發(fā)送字符A，但是沒有反應 [打印本頁]

作者: LUOStone 時間: 2018-4-28 14:05
標題: STM32 485串口配置過程串口不斷的發(fā)送字符A，但是沒有反應
#include "RS485.h"
#include "sys.h"
void RS485_Init(void)
{

      GPIO_InitTypeDef GPIO_InitStruct;
      USART_InitTypeDef USART_InitStructure;
      NVIC_InitTypeDef NVIC_InitStructure;


      RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);

      GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_USART2);
      GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_USART2);

      GPIO_InitStruct.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3; //GPIOA2與GPIOA3
      GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;//復用功能
      GPIO_InitStruct.GPIO_Speed = GPIO_Speed_100MHz;       //速度100MHz
      GPIO_InitStruct.GPIO_OType = GPIO_OType_PP; //推挽復用輸出
      GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP; //上拉

      GPIO_Init(GPIOA,&GPIO_InitStruct);


      GPIO_InitStruct.GPIO_Pin=GPIO_Pin_8;
      GPIO_InitStruct.GPIO_Mode=GPIO_Mode_OUT;

      GPIO_Init(GPIOG,&GPIO_InitStruct);

//USART2 初始化設(shè)置
      USART_InitStructure.USART_BaudRate = 9600;//波特率設(shè)置
      USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字長為8位數(shù)據(jù)格式
      USART_InitStructure.USART_StopBits = USART_StopBits_1;//一個停止位
      USART_InitStructure.USART_Parity = USART_Parity_No;//無奇偶校驗位
      USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//無硬件數(shù)據(jù)流控制
      USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;       //收發(fā)模式
  USART_Init(USART2, &USART_InitStructure);

      USART_Cmd(USART2, ENABLE);
      USART_ClearFlag(USART2, USART_FLAG_TC);

      USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//開啟接受中斷
      //Usart2 NVIC 配置
  NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;//搶占優(yōu)先級3
      NVIC_InitStructure.NVIC_IRQChannelSubPriority =3;             //子優(yōu)先級3
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                      //IRQ通道使能
      NVIC_Init(&NVIC_InitStructure);       //根據(jù)指定的參數(shù)初始化VIC寄存器、


RS485_TX_EN       =0;                               //默認為接收模式
}u8 res;
void USART2_IRQHandler(void)
{

      if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)//接收到數(shù)據(jù)
      {
      res =USART_ReceiveData(USART2);//;讀取接收到的數(shù)據(jù)USART2->DR

      }


}
void RS485_Sendbyte(u8 d)//485發(fā)送一個字節(jié)
      {
      RS485_TX_EN       =1;       //發(fā)送模式
            USART_SendData(USART2,d);
            while(USART_GetFlagStatus(USART2,USART_FLAG_TC)==RESET);
            USART_ClearFlag(USART2,USART_FLAG_TC);
            RS485_TX_EN       =0;


      }

int main(void)
{
      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//設(shè)置系統(tǒng)中斷優(yōu)先級分組2
      RS485_Init();
      while(1)
      {
      RS485_Sendbyte('A');
      }
}
按理應該在主循環(huán)中，串口不斷的發(fā)送字符A，但是沒有反應，請大家看看怎么回事。謝謝。

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