hex.c

C51单片机端

#include <ctype.h>
#include <stdio.h>

#include "config.h"
#include "isp.h"
#include "lcd.h"
#include "hex.h"

unsigned char mBuffer[256];
unsigned int  offset;
unsigned char Msg;
unsigned char m_BankSector;
unsigned char type, data_value, sum, sum_1, sum_2;
unsigned int  mlength;	
unsigned int  mbyte;

void hex_decoder(unsigned char mRxData)
{
	static state = REC_MARK;
	switch(state)
	{
		case REC_MARK: 
			if (mRxData == ':') 
			{
				state = REC_LEN_1; 
				mbyte=0;
			}
			else
				state = REC_MARK; 
			break;
		
		case REC_LEN_1: 
			mlength = toint(mRxData) * 16;
			state = REC_LEN_2;
			break;
		
		case REC_LEN_2: 
			mlength = mlength + toint(mRxData);
			state = OFFSET_1;
			break;

		case OFFSET_1: 
			offset = toint(mRxData) * 4096;
			state = OFFSET_2;
			break;

		case OFFSET_2: 
			offset = offset + toint(mRxData) * 256;
			sum_1= offset / 256;
			state = OFFSET_3;
			break;

		case OFFSET_3: 
			offset = offset + toint(mRxData) * 16;
			state = OFFSET_4;
			break;

		case OFFSET_4: 
			offset = offset + toint(mRxData);
			sum_2 = offset - sum_1 * 256;
			state = REC_TYP_1;
			break;

		case REC_TYP_1: 
			type = toint(mRxData) * 16;
			state =REC_TYP_2;
			break;

		case REC_TYP_2: 
			type = type + toint(mRxData);
			sum = (unsigned char)mlength + sum_1 + sum_2 + type;
			if(mlength==0x00)state=CHEKSUM_1; 
			else state = DATA_1; 
			break;

		case DATA_1: 
			data_value = toint(mRxData) * 16 ;
			state = DATA_2;
			break;

		case DATA_2: 
			data_value = data_value + toint(mRxData);
			sum = sum + data_value;
			mBuffer[mbyte] =  data_value;
			mbyte++;
			if(mlength<0xFF)
			{
				if(mbyte == mlength)state = CHEKSUM_1;
				else state = DATA_1; 
			}
			else
			{
				if(mbyte == (mlength+1))state = CHEKSUM_1;
				else state = DATA_1; 
			}
			break;

		case CHEKSUM_1: 
			sum_1 = toint(mRxData) * 16;
			sum = (~sum) + 1; 
			state = CHEKSUM_2;
			break;

		case CHEKSUM_2: 
		    sum_1 = sum_1 + toint(mRxData);
			state = REC_MARK; 
			if(sum_1 != sum)
			{
				if(type==0x00)Msg = HEX_DEC_FRAME_ERR;       //帧错误
				else if(type==0x02)Msg = HEX_DEC_SEG_ERR;    //段错误
				else if(type==0x12)Msg = HEX_DEC_SEG_VERIFY_ERR;   //段地址错误

			}
			else
			{
				if(type==0x00)Msg = HEX_DEC_FRAME_DATA;      //帧数据
				else if(type==0x01)Msg = HEX_DEC_END;        //结束
				else if(type==0x02)							 //段地址
				{
					Msg = HEX_DEC_SEG_DATA;		 //段数据地址
					m_BankSector =  mBuffer[1];
				}
				else if(type==0x03)Msg = HEX_DEC_START;            //开始下载
				else if(type==0x0A)Msg = HEX_DEC_SEG_IRQ;          //段请求
				else if(type==0x0D)Msg = HEX_DEC_FRAME_IRQ;        //帧请求
				else if(type==0x10)Msg = HEX_DEC_VERIFY_START;     //帧比较开始
				else if(type==0x12)
				{
					Msg = HEX_DEC_SEG_VERIFY_DATA;   //段比较数据
					m_BankSector =  mBuffer[1];
				}
				else if(type==0x15)		//帧比较地址
				{
					Msg = HEX_DEC_FRAME_VERIFY_DATA; //比较帧地址
 					offset = mBuffer[0]*256+mBuffer[1];
				}
				else if(type==0x16)Msg = HEX_DEC_VERIFY_FRAME_IRQ;  //比较帧请求
				else if(type==0x19)Msg = HEX_DEC_VERIFY_FRAME_END;  //比较结束
				else if(type==0x1B)Msg = HEX_DEC_PROGRAM_ERR;       //错误结束
				else if(type==0x1C)Msg = HEX_DEC_SECTOR_IRQ;	    //扇区设置命令
				else if(type==0x1D)
				{
					Msg = HEX_DEC_SECTOR_BANK;	    //扇区设置命令
					offset = mBuffer[0]*256+mBuffer[1];
				}
			}
			break;
		default : 
			state = REC_MARK; 
			break;
	}
}