hex.c

SM5964 ISP程序。.........

#include"hex.h"
#include<ctype.h>
uchar hex_parser(void)
{
  uchar hex_data;
  status=HEX_DEC_OK;
  while(status==HEX_DEC_OK)
  	{
  	 if(nb_rx_data!=0)
  	 	{
  	 	hex_data=rx_buffer_rd();
		status=hex_decoder(hex_data);
  	 	}
  	}
  return status;
}
unsigned char hex_decoder(unsigned char hex_data)
{
  static uchar state=REC_MARK;
  static uchar length,type,nb_byte,data_value,sum,sum_1,sum_2;
  static Uint16 offset;
   switch(state){
   	case REC_MARK:if(hex_data==':'){state=REC_LEN_1;nb_byte=0;}else state=REC_MARK;break;
	case REC_LEN_1:length=toint(hex_data)*16;state=REC_LEN_2;break;
	case REC_LEN_2:length=toint(hex_data)+length;state=OFFSET_1;break;
	case OFFSET_1:offset=toint(hex_data)*4096;state=OFFSET_2;break;
	case OFFSET_2:offset=offset+toint(hex_data)*256;sum_1=offset/256;state=OFFSET_3;break;
	case OFFSET_3:offset=offset+toint(hex_data)*16;state=OFFSET_4;break;
	case OFFSET_4:offset=offset+toint(hex_data);sum_2=offset-sum_1*256;state=REC_TYP_1;break;
    case REC_TYP_1:type=toint(hex_data)*16;state=REC_TYP_2;break;
	case REC_TYP_2:type=type+toint(hex_data);sum=length+sum_1+sum_2+type;if(length==0)state=CHEKSUM_1;else state=DATA_1;break;
	case DATA_1:data_value=toint(hex_data)*16;state=DATA_2;break;
	case DATA_2:data_value=data_value+toint(hex_data);sum=sum+data_value;
	                     flash_wr(offset+nb_byte,data_value);
			       nb_byte++;
				if(nb_byte==length)state=CHEKSUM_1;else state=DATA_1;
				break;
   case CHEKSUM_1:sum_1=toint(hex_data)*16;sum=(~sum)+1;state=CHEKSUM_2;break;
   case CHEKSUM_2:sum_1=sum_1+toint(hex_data);if(sum_1!=sum)status=HEX_DEC_CSERR;state=REC_MARK;if(type==0x01)status=HEX_DEC_END;break;
   	}
   return status;
}