关于232转485的问题

weiyaogun 提问时间：2017-11-3 19:50 /

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»¯
LED(ON);
USART1_Config(); //USART1 ÅäÖÃ
USART3_Config(); //USART3 ÅäÖÃ
//CAN_Config();
NVIC_Configuration();// ½ÓÊÕÖÐ¶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»¯£¬PA8: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»¯GPIOA

/* USART1 ¹¤×÷Ä£Ê½ÅäÖÃ */
USART_InitStructure.USART_BaudRate = 9600; //²¨ÌØÂÊÉèÖÃ£º9600
USART_InitStructure.USART_WordLength = USART_WordLength_8b; //Êý¾ÝÎ»ÊýÉèÖÃ£º8Î»
USART_InitStructure.USART_StopBits = USART_StopBits_1; //Í£Ö¹Î»ÉèÖÃ£º1Î»
USART_InitStructure.USART_Parity = USART_Parity_No ;  //ÊÇ·ñÆæÅ¼Ð£Ñé£ºÎÞ
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //Ó²¼þÁ÷¿ØÖÆÄ£Ê½ÉèÖÃ£ºÃ»ÓÐÊ¹ÄÜ
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//½ÓÊÕÓë·¢ËÍ¶¼Ê¹ÄÜ
USART_Init(USART1, &USART_InitStructure);  //³õÊ¼»¯USART1

/*Ê¹ÄÜ´®¿Ú1½ÓÊÕÖÐ¶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»¯£¬PB10: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»¯GPIOA

/* USART3 ¹¤×÷Ä£Ê½ÅäÖÃ */
USART_InitStructure.USART_BaudRate = 9600; //²¨ÌØÂÊÉèÖÃ£º9600
USART_InitStructure.USART_WordLength = USART_WordLength_8b; //Êý¾ÝÎ»ÊýÉèÖÃ£º8Î»
USART_InitStructure.USART_StopBits = USART_StopBits_1; //Í£Ö¹Î»ÉèÖÃ£º1Î»
USART_InitStructure.USART_Parity = USART_Parity_No ;  //ÊÇ·ñÆæÅ¼Ð£Ñé£ºÎÞ
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //Ó²¼þÁ÷¿ØÖÆÄ£Ê½ÉèÖÃ£ºÃ»ÓÐÊ¹ÄÜ
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//½ÓÊÕÓë·¢ËÍ¶¼Ê¹ÄÜ
USART_Init(USART3, &USART_InitStructure);  //³õÊ¼»¯USART3

/*Ê¹ÄÜ´®¿Ú3½ÓÊÕÖÐ¶Ï*/
  USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
  USART_Cmd(USART3,ENABLE);// USART3Ê¹ÄÜ
}

   /*·¢ËÍÒ»¸ö×Ö½ÚÊý¾Ý*/
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);    //485½ÓÊÕµ½µÄÊý¾ÝÍ¨¹ý232·¢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);
//232½ÓÊÕµ½µÄÊý¾ÝÍ¨¹ý·¢ËÍ³öÈ¥
   RS485_SendByte(i);


//cansend(i);
}

求大神!!!!!