pic33f 九位 485通信

只看该作者 · 2021-9-13 16:19

使能地址监测，接收没问题，但是发送的时候会进入接收中断，请大家帮忙看看

只看该作者 · 2021-9-13 16:19

/*
* File: main.c
* Author: Vincent
*
* Created on 2021年9月8日, 上午10:00
*/
#include "system.h"
#include "p33FJ128MC804.h"
//定义变量
int RS485_paratemer_tx_end = 0;
int RS485_paratemer_rx_end = 0;
int n = 0;
int word_number = 1;
unsigned RS485_Buff[13];
unsigned RS485_Buff_tx[13] ;//{0x150,0x0D,0x43,0x0D,0x05,0x03,0x05,0x03,0x01,0x00,0x00,0x00,0xBE};
int m = 0;
int i;
int RS485_parameter_tx_counter = 13;
int RS485_patameter_length;
int buff_sum = 0;
int judge_word4;
int cmd_parameter_save;
int cmd_parameter_transfer;//发参数
int rx_counter;
void RS485_parameter_read(void);
void RS485_parameter_transfer(void);
void RS485_parameter_write(void);
void RS485_parameter_dispose(void);
void Delay_1ms(unsigned int t)//t = 1000大概1s
{
unsigned int i,j;
for(i = 0;i < t;i ++)
      for(j = 0;j < 100;j ++);
}

void RS485_RX_Init(void)//配置接收
{
TRISAbits.TRISA7 = 0;//485EN 485接收使能引脚
RPOR5bits.RP11R = 0b00011; //配置RP11为TX引脚
//RPOR5bits.RP10R = 0b0001010;
RPINR18bits.U1RXR = 0b0001010;//将接收配置到RP10
PORTAbits.RA7 = 0;//DE发送使能信号高电平有效 RE为接收使能信号低电平有效

U1MODEbits.STSEL = 0;//一个停止位
U1MODEbits.PDSEL = 0b11; // 9数据位无奇偶校验
_ADDEN = 1;//使能地址检测
U1MODEbits.ABAUD = 0; // 禁止波特率测量或测量已完成
U1MODEbits.BRGH = 0; // BRG 在每个位周期内产生 16 个时钟信号（ 16 倍频波特率时钟，标准模式）
U1BRG = ((3686400/57600)/16)-1;//80MHz波特率57600（按照计算公式）
U1STAbits.UTXISEL0 = 0;
U1STAbits.URXISEL = 0b00;//当接收到一个字符且该字符从 UxRSR 传输给接收缓冲区，
//使接收缓冲区有一个或多个字符时，中断标志位置 1。
IEC0bits.U1TXIE = 1;//使能发送中断
IEC0bits.U1RXIE = 1;//使能接收中断
U1MODEbits.UARTEN = 1;//使能UART
}

int main()
{
RS485_RX_Init();//配置接收
while(1)
{
      if(RS485_paratemer_rx_end == 1)//处理参数程序
      {
         RS485_paratemer_rx_end = 0;
         RS485_parameter_dispose();
      }
      if(RS485_paratemer_tx_end == 1)
      {
         RS485_paratemer_tx_end = 0;
         RS485_parameter_tx_counter =13;
         while(_TRMT !=1);
         _UTXEN = 0;//禁止发送器
         PORTAbits.RA7 = 0;//DE发送使能信号高电平有效 RE为接收使能信号低电平有效
         n = 0;
         _ADDEN = 1;//使能地址检测
      }



}
}
void RS485_parameter_dispose(void)
{
if((RS485_Buff[0]&0b10000000) == 0)
{
         for(i=0;i<13;i++)
      {
         RS485_Buff_tx[i] = RS485_Buff[i];
      }
}
for(i=0;i<RS485_patameter_length;i++)
{
      buff_sum += RS485_Buff[i];
}
if((buff_sum&0xff) == RS485_Buff[RS485_patameter_length])
{
      buff_sum = 0;
      if((RS485_Buff[0]&0b1111111) == 0x50)
      {
         if((RS485_Buff[0]&0b10000000) == 0)
         {
            RS485_parameter_write();
         }
         else
         {
            RS485_parameter_read();
         }
      }
      else
      {
         buff_sum = 0;
         _ADDEN = 1;//使能地址检测
      }
}
else
{
      buff_sum = 0;
      _ADDEN = 1;//使能地址检测
}
}
void RS485_parameter_read(void)
{
switch (RS485_Buff[2])
{
         case 0x43:
         {
            switch (RS485_Buff[3])
                  case 0x0D:
                  {
                     PORTAbits.RA7 = 1;//DE发送使能信号高电平有效 RE为接收使能信号低电平有效
                     _UTXEN = 1;//使能发送器
                  }

                  break;
         }
         break;
         default:
            _ADDEN = 1;//使能地址检测
}
}
void RS485_parameter_write(void)
{
switch (RS485_Buff[2])
{
      case 0x43:
         switch (RS485_Buff[3])
         {
            case 0x0D:
                  cmd_parameter_save = 1;//写铁电标志
                  _ADDEN = 1;//使能地址检测
                  break;
         }
default: _ADDEN = 1;//使能地址检测
}
}
void __attribute__((__interrupt__, auto_psv)) _U1RXInterrupt(void)//接收中断
{
//if(_UTXEN == 1)
      //goto tiaochu;
RS485_Buff[m] = U1RXREG;
switch(word_number)
{
      case 1:
            _ADDEN = 0;//禁止地址检测
            word_number = 2;
            m++;
         break;
      case 2:
            rx_counter = RS485_Buff[1] - 1;
            RS485_patameter_length = RS485_Buff[1] - 1;
            word_number = 3;
            m++;
            rx_counter--;
         break;
      case 3:
         m++;
         rx_counter--;
         if(rx_counter == 0)
         {
            RS485_paratemer_rx_end = 1;
            word_number = 1;
            m = 0;
         }
}
//tiaochu:
IFS0bits.U1RXIF = 0;
}
void __attribute__((__interrupt__, auto_psv)) _U1TXInterrupt(void)//发送中断
{
IFS0bits.U1TXIF = 0;
if(RS485_parameter_tx_counter == 0)
{
      RS485_paratemer_tx_end = 1;

      word_number = 1;
      m=0;

}
else
{
      U1TXREG = RS485_Buff_tx[n];
      RS485_parameter_tx_counter --;
      n++;
      //while(_TRMT !=1);
}
}

pic33f 九位 485通信

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