求解：串口1+SP3485 收不到数据

MY8269 · 发表于 2014-1-17 18:45:23

请教原子大哥：我用串口做485通讯，发送数据正常，但是接收数据很不正常，偶尔能收到个数据，求解！

#include <stm32f10x_lib.h> // /* STM32F10x???¨?? */
#include "sys.h"
#include "rs485.h"
#include "delay.h"

extern unsigned char Sen_YuLa[ 8 ];
u8 RS485_OK = 0;
u8 TOUCH1 = 0;
u8 RS485_RX_BUF[64]; //????????,×??ó64??×???.
u8 RS485_RX_CNT=0;

void USART1_IRQHandler(void)
{
u8 res;

     if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) //??????????
     {
      res =USART_ReceiveData(USART1); //????????????????
          if( RS485_RX_CNT<64 )
          {
               RS485_RX_BUF[RS485_RX_CNT]=res; //??????????????
               RS485_RX_CNT++; //????????????1
          }
     }
}

void RS485_Init(u32 bound)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

     RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);

     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;     //PA8????????
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;    //???ì????
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOA, &GPIO_InitStructure);

     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA9
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //???????ì
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //????????
    GPIO_Init(GPIOA, &GPIO_InitStructure);

     RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1,ENABLE);//????????2
     RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1,DISABLE);//????????

     USART_InitStructure.USART_BaudRate = bound;//??°??è????9600;
     USART_InitStructure.USART_WordLength = USART_WordLength_8b;//8???????¤??
     USART_InitStructure.USART_StopBits = USART_StopBits_1;//??????????
     USART_InitStructure.USART_Parity = USART_Parity_No;///???????é??
     USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//???????????÷????
     USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//??·?????

     USART_Init(USART1, &USART_InitStructure); //??????????

     NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel; //USART1_IRQn
     NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//??????????3
     NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //×???????3
     NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;   //IRQ?¨??????
     NVIC_Init(&NVIC_InitStructure); //?ù?????¨????????????VIC?????÷

    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//????????

    USART_Cmd(USART1, ENABLE);                    //????????
      RS485_TX_EN=1;   //??????·???????
}

void RS485_Send_Data(u8 *buf,u8 len)
{
     u8 t;
     RS485_TX_EN=1;   //?è????·???????
    for(t=0;t<len;t++)  //??··???????
     {
          while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET)
          {
               ;
          }
          USART_SendData(USART1,buf[t]);
     }
     while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET)
     {
          ;
     }
     RS485_RX_CNT=0;
     RS485_TX_EN=0;    //?è????????????
}
//RS485?é??????????????
//buf:?????????×???·
//len:???????????¤??
void RS485_Receive_Data(u8 *buf,u8 *len)
{
     u8 rxlen=RS485_RX_CNT;
     u8 i=0;
     *len=0;    //??????0
     delay_ms(10);  //????10ms,????????10ms??????????????????,?ò?????????á??
     if(rxlen==RS485_RX_CNT&&rxlen)//????????????,???????ê????
     {
          for(i=0;i<rxlen;i++)
          {
               buf=RS485_RX_BUF;
          }
          *len=RS485_RX_CNT; //????±????????¤??
          RS485_RX_CNT=0;  //????
     }
}