com0int.c

低压电力线载波通信PL3200驱动程序

/********************************************************************
包含头文件
********************************************************************/
#include "PL3200.H"
#include "CONST.H"
#include "RAM.H"
#include "IO.H"

/********************************************************************
函数名称: void Com0Int(void) interrupt 6
功    能: 串口1中断接收处理
入    口: 无
出    口: COM0_RECE_OK  COM0_RECE_OK='C',接收普通帧成功
                        COM0_RECE_OK='F',接收特殊帧成功
                        其他:未成功接收数据帧
--------------------------------------------------------------------
说    明: a、串口接收成功判断
            1、普通帧
             1)依次接收到'S' 'N' 'D'  
             2)接收到的数据长度大于18、小于100时为合法
             3)依次接收到固定数据0xff 0xff 0xff 0xff 0xff 0xff 0x09 0xaf
             4)按长度接收后续数据,校验要正确
            2、特殊帧
             1)依次接收到'C' 'I' 'D' 0x0d 0x0a
          b、串口配置:9600bps,偶校验
********************************************************************/
void Com0Int(void) interrupt 6
{
    if(ERI)
    {   
        uint8 i,sbuf_temp,temp ;
        bit even_bit=0 ; 
         
        ERI = 0 ;
        com0_tmr = 60 ;
        sbuf_temp = SBUF1 ;
        temp = SBUF ;
        
        for(i=0;i<8;i++)
        {//判断数据是否为偶校验
            if((temp&0x80)==0x80)
            {
                even_bit = !even_bit ;
            }
            temp = (temp<<1) ;
        }
        
        if(even_bit!=RB8)
        {
            com0_tmr = 2 ;
            return ;
        }
    
        
        if(com0_step==0)
        {
            if(sbuf_temp=='S')
            {//接收'S'
                comd_sel_bit  = 0 ;
                com0_rece_ptr = 0 ;
                com0_rece_buf[com0_rece_ptr] = sbuf_temp ;
                com0_step = 1 ;
            }
            else 
            {//接收'C'
                if(sbuf_temp=='C')
                {
                    comd_sel_bit  = 1 ;
                    com0_step = 1 ;
                }   
            }
        }
        else if(com0_step==1)
        {
            if(!comd_sel_bit)
            {
                if(sbuf_temp=='N')
                {//接收'N'
                    com0_rece_ptr++ ;
                    com0_rece_buf[com0_rece_ptr] = sbuf_temp ;
                    com0_step = 2 ;
                }
                else
                {
                    com0_step = 0 ;
                }
            }
            else
            {
                if(sbuf_temp=='I')
                {//接收'I'
                    com0_step = 2 ;
                }  
                else
                {
                    com0_step = 0 ;
                } 
            }  
        }
        else if(com0_step==2)
        {
            if(!comd_sel_bit)
            {//接收'D'
                if(sbuf_temp=='D')
                {
                    com0_rece_ptr++ ;
                    com0_rece_buf[com0_rece_ptr] = sbuf_temp ;
                    com0_step = 3 ;
                }
                else
                {
                    com0_step = 0 ;
                }
            }
            else
            {
                if(sbuf_temp=='D')
                {//接收'D'
                    com0_step = 3 ;
                }
                else
                {
                    com0_step = 0 ;
                }
            }
        }
        else if(com0_step==3)
        {
            if(!comd_sel_bit)
            {
                if((sbuf_temp>=18)&&(sbuf_temp<(com1_rece_buf_len-5))) 
                {//接收数据长度
                    com0_rece_ptr++ ;
                    com0_rece_buf[com0_rece_ptr] = sbuf_temp ;
                    com0_rece_len = 6 ;
                    com0_step = 4 ;
                }  
                else
                {
                    com0_step = 0 ;
                }
            }
            else
            {
                if(sbuf_temp==0x0d)
                {
                    com0_step = 4 ;
                }
                else
                {
                    com0_step = 0 ;
                }
            }
        }
        else if(com0_step==4)
        {
            if(!comd_sel_bit)
            {
                if(sbuf_temp==0xff)
                {//接收6字节FFH
                    com0_rece_ptr++ ;
                    com0_rece_buf[com0_rece_ptr] = sbuf_temp ;
            
                    com0_rece_len-- ;
                    if(com0_rece_len==0)
                    {
                        com0_step = 5 ;
                    }   
                }
                else
                {
                    com0_step = 0 ;
                }
            }
            else
            {
                if(sbuf_temp==0x0a)
                {
                    
                    COM0_RECE_OK = 'F' ;
                }
                
                com0_step = 0 ;
            }
        }
        else if(com0_step==5)
        {//接收09H
            if(sbuf_temp==0x09)
            {
                com0_rece_ptr++ ;
                com0_rece_buf[com0_rece_ptr] = sbuf_temp ;
            
                com0_step = 6 ;
            }
            else
            {
                com0_step = 0 ;
            }
        }
        else if(com0_step==6)
        {//接收AFH
            if(sbuf_temp==0xaf)
            {
                com0_rece_ptr++ ;
                com0_rece_buf[com0_rece_ptr] = sbuf_temp ;
                com0_step = 7 ;
                
                com0_rece_len = com0_rece_buf[3]-10 ;
                com0_rece_crc = 0 ;
            }
            else
            {
                com0_step = 0 ;
            }
        }
        else if(com0_step==7)
        {//接收载波帧
            com0_rece_ptr++ ;
            com0_rece_buf[com0_rece_ptr] = sbuf_temp ; 
            com0_rece_crc = com0_rece_crc+com0_rece_buf[com0_rece_ptr] ; 
            
            com0_rece_len-- ;
            if(com0_rece_len==0)
            {
                com0_step = 8 ;
            }   
        }
        else if(com0_step==8)
        {
            com0_rece_ptr++ ;
            com0_rece_buf[com0_rece_ptr] = sbuf_temp ; 
            if(com0_rece_buf[com0_rece_ptr]==((uint8)(com0_rece_crc%256)))
            {
                com0_step = 9 ;
            }
            else
            {
                com0_step = 0 ;
            }
        }
        else if(com0_step==9)
        {
            com0_rece_ptr++ ;
            com0_rece_buf[com0_rece_ptr] = sbuf_temp ; 
            if(com0_rece_buf[com0_rece_ptr]==((uint8)(com0_rece_crc/256)))
            {
                for(i=0;i<(com0_rece_buf[3]+4);i++)
                {
                    com0_rece_buf_bak[i] = com0_rece_buf[i] ;
                }

                COM0_RECE_OK = 'C' ;
                com0_step = 0 ;
            }
            else
            {
                com0_step = 0 ;
            }
        }
        else
        {
            com0_step = 0 ;
        }
    }
}