comd.c

TL16C554串口扩展芯片的四个串口通信程序

//comD.c

#include "head.h"

extern uint baud;
extern uchar COM_BUFFER[1024]; 
extern uchar Command; 
extern uchar Function;
extern uchar Key_Flag;
extern uchar Key_Value;
extern uchar Vol_Flag;
extern uchar Vol_Value;
extern uchar Data_Flag;
extern uint  Data_Len; 

extern uchar CheckSum_ComD(uchar *p_data,uchar len);

void comD_send_string(uchar *p_data,uint len)
{  
	uint i,j;
     	uint n,k;
     	uchar status_lsr;
        
    	CSD = 0;
        if(len>16)
        {      
        	n=len/16;
        	k=len%16;
        	for(i=0;i<n;i++)
        	{
        		for(j=0;j<16;j++)
        		{
        		  	  TL16C554_D_THR=*(p_data+16*i+j);       		  	         		  	  
        		}
        		while((((status_lsr=TL16C554_D_LSR)&0x20)==0)&&
        		      (((status_lsr=TL16C554_D_LSR)&0x10)==0));
        	}
         	for(i=0;i<k;i++)
         	{
			TL16C554_D_THR=*(p_data+16*n+i);
		}   	
        }
        else
        {
         	for(i=0;i<len;i++)
         	{
			TL16C554_D_THR=*(p_data+i);
		}       	
        }
        CSD = 1; 
}

interrupt [EXT_INT0] void ext_int0_isr(void)
{
	uchar data; 
	uchar status_d_iir; 
	uchar status_d_lsr;
	uchar status_d_msr;	
	uint i;
	uint len;
	uint comD_t1=0;
	uint comD_t2=0; 
	static uint ComD_Cnt=0;
	static uchar ComD_Buf[64]; 
	
	CSD=0;
	status_d_iir = TL16C554_D_IIR;
	status_d_msr = TL16C554_D_MSR;
	status_d_lsr = TL16C554_D_LSR;		
	data = TL16C554_D_RBR; 
	if((ComD_Cnt == 0)&&(data == 0xA5))
	{      
		ComD_Cnt = 1;
		ComD_Buf[0] = 0xA5;
	}
	else if(ComD_Cnt > 0)
	{ 
		ComD_Cnt++;
		ComD_Buf[ComD_Cnt-1] = data;
		if((ComD_Buf[0]==0xA5)&&(ComD_Cnt==6)&&((ComD_Buf[1]==0xB1)||
		(ComD_Buf[1]==0xB3)||(ComD_Buf[1]==0xB5)||(ComD_Buf[1]==0xBC)||
		(ComD_Buf[1]==0xBD)||(ComD_Buf[1]==0xBE)||(ComD_Buf[1]==0xC3)))
		{
  			if(CheckSum_ComD(ComD_Buf,5)==ComD_Buf[5])
   			{  
   				Key_Flag = 1;
   				Command = ComD_Buf[1];
   				Key_Value = ComD_Buf[4];	
   			}
   			ComD_Cnt = 0;
		}
		else if((ComD_Buf[0]==0xA5)&&(ComD_Cnt==7)&&(ComD_Buf[1]==0xB8))
		{
			if(CheckSum_ComD(ComD_Buf,6)==ComD_Buf[6])
			{
   				Vol_Flag = 1;
  			 	Vol_Sel = ComD_Buf[4]; 
   				Vol_Value = ComD_Buf[5];
			}
			ComD_Cnt = 0;
		}
		else if((ComD_Buf[0]==0xA5)&&(ComD_Cnt==10)&&
			((ComD_Buf[1]==0xB9)||(ComD_Buf[1]==0xBA)))
		{
			if(CheckSum_ComD(ComD_Buf,9)==ComD_Buf[9])
			{
				Data_Flag = 1;
				Data_Len = 4;
   				Command = ComD_Buf[1];
   				for(i=0;i<4;i++)
   					COM_BUFFER[i]=ComD_Buf[i+5];
			}
			ComD_Cnt = 0;			
		}
		else if((ComD_Buf[0]==0xA5)&&(ComD_Cnt==(ComD_Buf[2]*256+ComD_Buf[3]+5))&&
		       ((ComD_Buf[1]==0xB2)||(ComD_Buf[1]==0xB7)||(ComD_Buf[1]==0xC2)||
		        (ComD_Buf[1]==0xC4)))
		{
			len = ComD_Buf[2]*256+ComD_Buf[3];
			if(CheckSum_ComD(ComD_Buf,len+4)==ComD_Buf[ComD_Cnt-1])
			{			      	      			      	  	
				Data_Flag = 1;
				Data_Len = len;
   				Command = ComD_Buf[1];
   				for(i=0;i<len;i++)
   					COM_BUFFER[i]=ComD_Buf[i+4];			      	  		
			}
			ComD_Cnt = 0;			 	
		}	
		else if((ComD_Buf[0]==0xA5)&&(ComD_Cnt==(ComD_Buf[2]*256+ComD_Buf[3]+6))&&
		       ((ComD_Buf[1]==0xB4)||(ComD_Buf[1]==0xB6)))
		{
			len = ComD_Buf[2]*256+ComD_Buf[3];
			if(CheckSum_ComD(ComD_Buf,len+5)==ComD_Buf[ComD_Cnt-1])
			{			      	      			      	  	
				Data_Flag = 1;
				Data_Len = len; 			      		
   				Command = ComD_Buf[1];
   				Function = ComD_Buf[4];
   				for(i=0;i<len;i++)
   					COM_BUFFER[i]=ComD_Buf[i+5];				      	  		
			}
			ComD_Cnt = 0;			 	
		}
		else
		{
			for (comD_t1=1;comD_t1<ComD_Cnt;comD_t1++)
			{
				if(ComD_Buf[comD_t1]==0xA5)
				{
					ComD_Cnt=ComD_Cnt-comD_t1;
					for(comD_t2=0;comD_t2<ComD_Cnt;comD_t2++)
					{
						ComD_Buf[comD_t2]=ComD_Buf[comD_t1+comD_t2];
					}
					break;
				}
			}
			if(ComD_Cnt==64)
				ComD_Cnt=0;			
		}
	}
	CSD=1;
	EIFR |= 0x01;	
}