xmodem.c

c8051f310xmodembootloader.rar

#include <c8051f310.h>                
#include <intrins.h>
#include <string.h>
#include <stdio.h>
#include "bootloader.h"
#include "flash.h"
#include "xmodem.h"

/*
Xmodem Frame form:    <SOH><blk><255-blk><--128 data bytes--><CRC hi><CRC lo>
1K-Xmodem Frame form: <SOH><blk><255-blk><--1024 data bytes--><CRC hi><CRC lo>
*/
//#define XMODEM_SOH 0x01
//#define XMODEM_STX 0x02
#define XMODEM_EOT 0x04
#define XMODEM_ACK 0x06
#define XMODEM_NAK 0x15
#define XMODEM_CAN 0x18 // Cancel


#define USE_1K_XMODEM 0  /* 1 for use 1k_xmodem, 0 for xmodem */

#if (USE_1K_XMODEM)  //for 1K xmodem protocol
#define XMODEM_DATA_SIZE 1024
#define XMODEM_HEAD 0x02

#else //for Xmodem protocol
#define XMODEM_DATA_SIZE 128
#define XMODEM_HEAD 0x01

#endif



UI8_T  xdata frame_data[128];
UI8_T  pack_counter;
UI16_T  real_pack_counter;
// Table of CRC constants - implements x^16+x^12+x^5+1
UI16_T code crc16_tab[] = {
    0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, 
    0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, 
    0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, 
    0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, 
    0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, 
    0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, 
    0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, 
    0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, 
    0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, 
    0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, 
    0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, 
    0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, 
    0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, 
    0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, 
    0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, 
    0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, 
    0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, 
    0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, 
    0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, 
    0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, 
    0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, 
    0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, 
    0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, 
    0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, 
    0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, 
    0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, 
    0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, 
    0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, 
    0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, 
    0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, 
    0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, 
    0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0, 
};



// 从串口接收一字节
UI8_T serial_get_char(void)
{
	UI8_T cTm;

	while(!RI0);
	cTm = SBUF0;
	RI0 = 0;
	return cTm;
}

// 向串口发送一字节
void serial_put_char(UI8_T c)
{
	while(!TI0);
	TI0 = 0;
	SBUF0 = c;
}

// 等串口有数据
// 返回0=无数据,1=有数据
I8_T WaitChar(int tn)
{
	unsigned long ulTmo;
	while(tn--)
	{
		for (ulTmo=0; ulTmo<40000; ulTmo++)
		{
			if (RI0)return 1;
		}
		
	}
	return 0;
}



// 接收数据帧
int GetRecord(unsigned char blocknum, unsigned char *dest)
{
	UI8_T nextChar;
	I16_T size;
	UI16_T chk;

	nextChar = serial_get_char();
	if (nextChar != (255-blocknum))
	{
		return 0;
	}
	chk = 0;
	for (size = 0; size < XMODEM_DATA_SIZE; ++size)
	{
		nextChar = serial_get_char();
		chk = crc16_tab[((chk>>8) ^ nextChar) & 0xFF] ^ (chk << 8);
		dest[size] = nextChar;
	}
	nextChar = serial_get_char();
	if (nextChar != ((chk >> 8) & 0xFF)) return 0;
	nextChar = serial_get_char();
	if (nextChar != (chk& 0xFF)) return 0;
	return 1;
}


#define INVALID_STATE 0
#define WAITING_START 1
#define WAIT_SOH      2
#define RX_PACKET     3
#define RX_EOT        4
#define SEND_NAK      5

// xmodem协议接收文件
I8_T xmodem_rx(void)
{
	I8_T ntry;
	I8_T state;
	UI8_T nextChar;
	UI16_T i;

	ntry = 0;
	pack_counter = 1;
	real_pack_counter = 1;
	state = WAITING_START;

	while(1)
	{
		switch(state)
		{
			case WAITING_START:			              // 请求传送
				serial_put_char('C');	              // 发送请求符
				
				if (WaitChar(3))
				{
					nextChar = serial_get_char();	  // 接收帧头
					if (nextChar == XMODEM_HEAD)
					{
						state = RX_PACKET;		      // 收到帧头
					}
				}
				break;

			case WAIT_SOH:                      	  // 等帧头
				nextChar = serial_get_char();	      // 收帧头
				if (nextChar == XMODEM_HEAD)
				{
					state = RX_PACKET;
				}

				else if (nextChar == XMODEM_EOT)	  // 收到终止符
				{
					state = RX_EOT;
					serial_put_char(XMODEM_ACK);   	  // 回送应答符
					return (1);						  // 结束
				}

				else if (nextChar == XMODEM_CAN)	  // 取消
				{
					return (0);					      //by gjk 当取消时修改成0 默认返回1
				}
				break;

			case RX_PACKET:		                      // 收帧
				nextChar = serial_get_char();	 	  // 收帧计数
				if (nextChar != pack_counter)		  // 帧计数是否正确
				{
					serial_put_char(XMODEM_CAN);	  // 不正确,取消传送
					serial_put_char(XMODEM_CAN);
					serial_put_char(XMODEM_CAN);
					serial_put_char(XMODEM_CAN);
					return (-1);
				}
				if (GetRecord(pack_counter, frame_data))   //收数据
				{
					                                       //处理接收到的数据
														   //可写空间0x1000 - 0x3dff
					if(real_pack_counter >32 && real_pack_counter <= 124){
						for(i = 0; i < XMODEM_DATA_SIZE; i++){
							FLASH_ByteWrite (128*(real_pack_counter - 1) + i, frame_data[i]);
						}
					}

					++pack_counter;	
					++real_pack_counter;					// 计数加1
					ntry = 0;				
					state = WAIT_SOH;						// 等下一个帧
					serial_put_char(XMODEM_ACK);			// 发送应答
				}
				else                       	                // 收数据错误
				{
					if (++ntry >9)	                        // 错误次数超出限制
					{
						serial_put_char(XMODEM_CAN);	    // 取消传送
						serial_put_char(XMODEM_CAN);
						serial_put_char(XMODEM_CAN);
						serial_put_char(XMODEM_CAN);
						return (-1);
					}
					state = WAIT_SOH;
					serial_put_char(XMODEM_NAK);	        // 请求重传
				}
				break;

			default:
				break;
		}
	}
	return 0;
}