comc.c

TL16C554串口扩展芯片的四个串口通信程序

//comC.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_ComC(uchar *p_data,uchar len);

void comC_send_string(uchar *p_data,uint len)
{  
	uint i,j;
     	uint n,k;
     	uchar status_lsr;
        
    	CSC = 0;
        if(len>16)
        {      
        	n=len/16;
        	k=len%16;
        	for(i=0;i<n;i++)
        	{
        		for(j=0;j<16;j++)
        		{
        		  	  TL16C554_C_THR=*(p_data+16*i+j);       		  	         		  	  
        		}
        		while((((status_lsr=TL16C554_C_LSR)&0x20)==0)&&
        		      (((status_lsr=TL16C554_C_LSR)&0x10)==0));
        	}
         	for(i=0;i<k;i++)
         	{
			TL16C554_C_THR=*(p_data+16*n+i);
		}         	
        }
        else
        {
         	for(i=0;i<len;i++)
         	{
			TL16C554_C_THR=*(p_data+i);
		}       	
        }
        CSC = 1;
}

interrupt [EXT_INT6] void ext_int6_isr(void)
{
	uchar data; 
	uchar status_c_iir; 
	uchar status_c_lsr;
	uchar status_c_msr;	
	uint i;
	uint len;
	uint comC_t1=0;
	uint comC_t2=0; 
	static uint ComC_Cnt=0;
	static uchar ComC_Buf[64]; 
	
	CSC=0;
	status_c_iir = TL16C554_C_IIR;
	status_c_msr = TL16C554_C_MSR;
	status_c_lsr = TL16C554_C_LSR;		
	data = TL16C554_C_RBR; 
	if((ComC_Cnt == 0)&&(data == 0xA5))
	{      
		ComC_Cnt = 1;
		ComC_Buf[0] = 0xA5;
	}
	else if(ComC_Cnt > 0)
	{ 
		ComC_Cnt++;
		ComC_Buf[ComC_Cnt-1] = data;
		if((ComC_Buf[0]==0xA5)&&(ComC_Cnt==6)&&((ComC_Buf[1]==0xB1)||
		(ComC_Buf[1]==0xB3)||(ComC_Buf[1]==0xB5)||(ComC_Buf[1]==0xBC)||
		(ComC_Buf[1]==0xBD)||(ComC_Buf[1]==0xBE)||(ComC_Buf[1]==0xC3)))
		{
  			if(CheckSum_ComC(ComC_Buf,5)==ComC_Buf[5])
   			{  
   				Key_Flag = 1;
   				Command = ComC_Buf[1];
   				Key_Value = ComC_Buf[4];	
   			}
   			ComC_Cnt = 0;
		}
		else if((ComC_Buf[0]==0xA5)&&(ComC_Cnt==7)&&(ComC_Buf[1]==0xB8))
		{
			if(CheckSum_ComC(ComC_Buf,6)==ComC_Buf[6])
			{
   				Vol_Flag = 1;
  			 	Vol_Sel = ComC_Buf[4]; 
   				Vol_Value = ComC_Buf[5];
			}
			ComC_Cnt = 0;
		}
		else if((ComC_Buf[0]==0xA5)&&(ComC_Cnt==10)&&
			((ComC_Buf[1]==0xB9)||(ComC_Buf[1]==0xBA)))
		{
			if(CheckSum_ComC(ComC_Buf,9)==ComC_Buf[9])
			{
				Data_Flag = 1;
				Data_Len = 4;
   				Command = ComC_Buf[1];
   				for(i=0;i<4;i++)
   					COM_BUFFER[i]=ComC_Buf[i+5];
			}
			ComC_Cnt = 0;			
		}
		else if((ComC_Buf[0]==0xA5)&&(ComC_Cnt==(ComC_Buf[2]*256+ComC_Buf[3]+5))&&
		       ((ComC_Buf[1]==0xB2)||(ComC_Buf[1]==0xB7)||(ComC_Buf[1]==0xC2)||
		        (ComC_Buf[1]==0xC4)))
		{
			len = ComC_Buf[2]*256+ComC_Buf[3];
			if(CheckSum_ComC(ComC_Buf,len+4)==ComC_Buf[ComC_Cnt-1])
			{			      	      			      	  	
				Data_Flag = 1;
				Data_Len = len;
   				Command = ComC_Buf[1];
   				for(i=0;i<len;i++)
   					COM_BUFFER[i]=ComC_Buf[i+4];			      	  		
			}
			ComC_Cnt = 0;			 	
		}	
		else if((ComC_Buf[0]==0xA5)&&(ComC_Cnt==(ComC_Buf[2]*256+ComC_Buf[3]+6))&&
		       ((ComC_Buf[1]==0xB4)||(ComC_Buf[1]==0xB6)))
		{
			len = ComC_Buf[2]*256+ComC_Buf[3];
			if(CheckSum_ComC(ComC_Buf,len+5)==ComC_Buf[ComC_Cnt-1])
			{			      	      			      	  	
				Data_Flag = 1;
				Data_Len = len; 			      		
   				Command = ComC_Buf[1];
   				Function = ComC_Buf[4];
   				for(i=0;i<len;i++)
   					COM_BUFFER[i]=ComC_Buf[i+5];				      	  		
			}
			ComC_Cnt = 0;			 	
		}
		else
		{
			for (comC_t1=1;comC_t1<ComC_Cnt;comC_t1++)
			{
				if(ComC_Buf[comC_t1]==0xA5)
				{
					ComC_Cnt=ComC_Cnt-comC_t1;
					for(comC_t2=0;comC_t2<ComC_Cnt;comC_t2++)
					{
						ComC_Buf[comC_t2]=ComC_Buf[comC_t1+comC_t2];
					}
					break;
				}
			}
			if(ComC_Cnt==64)
				ComC_Cnt=0;			
		}
	}
	CSC=1;
	EIFR |= 0x40;	
}