232转485，在485上出了问题

2019-08-08 13:44发布

小弟初学，现在在做一个232转485的板子，目前在485这里出了问题，利用75176芯片进行ttl到485的变换，程序结构也挺简单，但是485要么无法进中断要么无法正确发出，求大神帮看看！

主程序在：
#include "stm32f10x.h"
#include "usart1.h"
#include "led.h"
//#include "CAN.h"

void NVIC_Configuration(void)
{

      NVIC_InitTypeDef NVIC_InitStructure;

  /* Configure the NVIC Preemption Priority Bits */
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

  /* Enable the USART1 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  /* Enable the USART3 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

      /* Enable the CAN Interrupt */
  //NVIC_InitStructure.NVIC_IRQChannel =USB_LP_CAN1_RX0_IRQn;
// NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
// NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
// NVIC_Init(&NVIC_InitStructure);

}

      int main(void)
{

      SystemInit();//ÅäÖÃÏμí3ê±ÖóÎa 72M
      LED_Init();//led3õê¼»ˉ
      LED(ON);
      USART1_Config(); //USART1 ÅäÖÃ
      USART3_Config(); //USART3 ÅäÖÃ
      //CAN_Config();
      NVIC_Configuration();// ½óêÕÖD¶ÏÅäÖÃ



  while (1){;}
}

串口程序在：
/*DE¸úGPIOA81ü½ÅÏàá¬*/
#define Set_DE  GPIO_SetBits(GPIOA,GPIO_Pin_8);
#define Clr_DE  GPIO_ResetBits(GPIOA,GPIO_Pin_8);

void delay_ms(u16 nms)
{
      u32 temp;
      SysTick->LOAD=9000*nms;
      SysTick->VAL=0X00;
      SysTick->CTRL=0X01;
      do{ temp=SysTick->CTRL;}
      while((temp&0x01)&&(!(temp&(1<<16))));
      SysTick->CTRL=0x00;
      SysTick->VAL=0X00;

}
//USART13õê¼»ˉ￡&#172

A8:RS485_DE$ PA9:RS485_TX$ PA8:RS485_RX$
void USART1_Config(void)
{
            GPIO_InitTypeDef GPIO_InitStructure;
            USART_InitTypeDef USART_InitStructure;

      /* ê1Äü USART1 ê±Öó*/
            RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
            RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);


            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
               Clr_DE;


      /* USART1 ê1óÃIO¶Ë¿úÅäÖÃ */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //¸′óÃíÆíìêä3ö
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;       //¸¡¿Õêäèë
  GPIO_Init(GPIOA, &GPIO_InitStructure); //3õê¼»ˉGPIOA

      /* USART1 1¤×÷Ä￡ê½ÅäÖÃ */
      USART_InitStructure.USART_BaudRate = 9600;       //2¨ìØÂêéèÖÃ￡o9600
      USART_InitStructure.USART_WordLength = USART_WordLength_8b;       //êy¾YÎ»êyéèÖÃ￡o8Î»
      USART_InitStructure.USART_StopBits = USART_StopBits_1;       //í￡Ö1Î»éèÖÃ￡o1Î»
      USART_InitStructure.USART_Parity = USART_Parity_No ;  //êÇ·ñÆæÅ¼D￡Ñé￡oÎT
      USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;       //ó2¼tá÷¿ØÖÆÄ￡ê½éèÖÃ￡oÃ»óDê1Äü
      USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//½óêÕóë·￠Ëí¶¼ê1Äü
      USART_Init(USART1, &USART_InitStructure);  //3õê¼»ˉUSART1

/*ê1Äü′®¿ú1½óêÕÖD¶Ï*/

USART_ITConfig(USART1, USART_IT_RXNE,ENABLE);
  USART_Cmd(USART1, ENABLE);// USART1ê1Äü
USART_ClearFlag(USART2,USART_FLAG_TC);
}


void RS485_SendByte(unsigned char SendData )
{
      Set_DE;
                              delay_ms(200);
                              USART_ClearFlag(USART1,USART_FLAG_TC);
      USART_SendData(USART1,SendData);
      while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);//TXE=·￠Ëí¼Ä′æÆ÷Îa¿Õ
                              delay_ms(200);
                              Clr_DE;
}

//USART33õê¼»ˉ￡&#172

B10:RS232_TX$ PB11:RS232_RX$
void USART3_Config(void)
{
            GPIO_InitTypeDef GPIO_InitStructure;
            USART_InitTypeDef USART_InitStructure;

      /* ê1Äü USART3 ê±Öó*/
            RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
            RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);


/* USART3 ê1óÃIO¶Ë¿úÅäÖÃ */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //¸′óÃíÆíìêä3ö
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;       //¸¡¿Õêäèë
  GPIO_Init(GPIOB, &GPIO_InitStructure); //3õê¼»ˉGPIOA

      /* USART3 1¤×÷Ä￡ê½ÅäÖÃ */
      USART_InitStructure.USART_BaudRate = 9600;       //2¨ìØÂêéèÖÃ￡o9600
      USART_InitStructure.USART_WordLength = USART_WordLength_8b;       //êy¾YÎ»êyéèÖÃ￡o8Î»
      USART_InitStructure.USART_StopBits = USART_StopBits_1;       //í￡Ö1Î»éèÖÃ￡o1Î»
      USART_InitStructure.USART_Parity = USART_Parity_No ;  //êÇ·ñÆæÅ¼D￡Ñé￡oÎT
      USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;       //ó2¼tá÷¿ØÖÆÄ￡ê½éèÖÃ￡oÃ»óDê1Äü
      USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//½óêÕóë·￠Ëí¶¼ê1Äü
      USART_Init(USART3, &USART_InitStructure);  //3õê¼»ˉUSART3

/*ê1Äü′®¿ú3½óêÕÖD¶Ï*/
  USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
  USART_Cmd(USART3,ENABLE);// USART3ê1Äü
}

      /*·￠Ëíò»¸ö×Ö½úêy¾Y*/
void UART3SendByte(unsigned char SendData )
{
      USART_SendData(USART3,SendData);
      while(USART_GetFlagStatus(USART3, USART_FLAG_TXE) == RESET);

}

中断：
      void USART1_IRQHandler(void)
{ unsigned char i=0;

      if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
  {
/* Read one byte from the receive data register */

i = USART_ReceiveData(USART1);

UART3SendByte(1);                //485½óêÕμ½μÄêy¾Yí¨1y232·￠Ëí3öè￥
//cansend(i);
  }

}

void USART3_IRQHandler(void)
{
      unsigned char i=0;

  if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)
  {
/* Read one byte from the receive data register */
i = USART_ReceiveData(USART3);
//232½óêÕμ½μÄêy¾Yí¨1y·￠Ëí3öè￥
               RS485_SendByte(i);


//cansend(i);
      }

求大神!!!!!

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