//#include //#include //#include //#include #define tgt_puts tgt_puts1 #undef XMODEM_DEBUG static inline __attribute__((always_inline)) int now() { int count; asm volatile("mfc0 %0,$9":"=r"(count)); return count; } static inline __attribute__((always_inline)) void *memcpy(char *s1, const char *s2, int n) { while(n--) *s1++=*s2++; } static __attribute__ ((section (".data"))) void * memset(void * s,int c, int count) { char *xs = (char *) s; while (count--) *xs++ = c; return s; } static __attribute__ ((section (".data"))) unsigned short _crc_xmodem_update (unsigned short crc, unsigned char data) { int i; crc = crc ^ ((unsigned short)data << 8); for (i=0; i<8; i++) { if (crc & 0x8000) crc = (crc << 1) ^ 0x1021; else crc <<= 1; } return crc; } static __attribute__ ((section (".data"))) int tgt_puts(char *str) { while(*str) tgt_putchar1(*str++); return 0; } //常数定义 #define BLOCKSIZE 128 //M16的一个Flash页为128字节(64字) #define DATA_BUFFER_SIZE BLOCKSIZE //定义接收缓冲区长度 //#define F_CPU 7372800 //系统时钟7.3728MHz //定义Xmoden控制字符 #define XMODEM_NUL 0x00 #define XMODEM_SOH 0x01 #define XMODEM_STX 0x02 #define XMODEM_EOT 0x04 #define XMODEM_ACK 0x06 #define XMODEM_NAK 0x15 #define XMODEM_CAN 0x18 #define XMODEM_EOF 0x1A #define XMODEM_WAIT_CHAR 'C' //定义全局变量 struct str_XMODEM { unsigned char SOH; //起始字节 unsigned char BlockNo; //数据块编号 unsigned char nBlockNo; //数据块编号反码 unsigned char Xdata[BLOCKSIZE]; //数据128字节 unsigned char CRC16hi; //CRC16校验数据高位 unsigned char CRC16lo; //CRC16校验数据低位 } strXMODEM ; //XMODEM的接收数据结构 /* GCC里面地址使用32位长度，适应所有AVR的容量*/ #define ST_WAIT_START 0x00 //等待启动 #define ST_BLOCK_OK 0x01 //接收一个数据块成功 #define ST_BLOCK_FAIL 0x02 //接收一个数据块失败 #define ST_OK 0x03 //完成 #ifdef XMODEM_DEBUG #define dbg_printf tgt_puts #else #define dbg_printf(...) #endif static __attribute__ ((section (".data"))) int testchar() { int count=2; int total, start; start = now(); while(1) { if(tgt_testchar1()) return 100; if(!count)break; if((now()-start>0x3000000 )){ start = now(); count--; } } return 0; } static __attribute__ ((section (".data"))) int get_data(unsigned char *ptr,unsigned int len,unsigned int timeout) { int i=0; volatile int count=1; while(i0) ptr[i++]=tgt_getchar(); else { if(!count)break; count--; } } return i; } //计算CRC16 static __attribute__ ((section (".data"))) unsigned int calcrc(unsigned char *ptr, unsigned int count) { unsigned int crc = 0; while (count--) { crc =_crc_xmodem_update(crc,*ptr++); } return crc; } static int __attribute__ ((section (".data"))) program1(char *p,int off, int size) { static int first = 1; if(first) { erase(); first = 0; } program(p,off,size); } int __attribute__ ((section (".data"))) xmodem_transfer(char *base) { unsigned char c; unsigned int i; unsigned int crc; unsigned int filesize=0; unsigned char BlockCount=1; //数据块累计(仅8位，无须考虑溢出) unsigned char STATUS; //运行状态 spi_init(); //向PC机发送开始提示信息 STATUS=ST_WAIT_START; //并且数据='d'或'D',进入XMODEM c=0; while(1) { tgt_putchar1(XMODEM_WAIT_CHAR); if(testchar()>0)break; } while(STATUS!=ST_OK) //循环接收，直到全部发完 { i=get_data(&strXMODEM.SOH,BLOCKSIZE+5,1000); //限时1秒，接收133字节数据 if(i) { //分析数据包的第一个数据 SOH/EOT/CAN switch(strXMODEM.SOH) { case XMODEM_SOH: //收到开始符SOH if (i>=(BLOCKSIZE+5)) { STATUS=ST_BLOCK_OK; } else { STATUS=ST_BLOCK_FAIL; //如果数据不足，要求重发当前数据块 tgt_putchar1(XMODEM_NAK); } break; case XMODEM_EOT: //收到结束符EOT //tgt_putchar1(XMODEM_ACK); //通知PC机全部收到 //STATUS=ST_OK; tgt_putchar1(XMODEM_NAK); //要求重发当前数据块 STATUS=ST_BLOCK_FAIL; dbg_printf("transfer succeed!\r\n"); break; case XMODEM_CAN: //收到取消符CAN //tgt_putchar1(XMODEM_ACK); //回应PC机 //STATUS=ST_OK; tgt_putchar1(XMODEM_NAK); //要求重发当前数据块 STATUS=ST_BLOCK_FAIL; dbg_printf("Warning:user cancelled!\r\n"); break; default: //起始字节错误 tgt_putchar1(XMODEM_NAK); //要求重发当前数据块 STATUS=ST_BLOCK_FAIL; break; } } else { dbg_printf("time out!\n"); break; } if (STATUS==ST_BLOCK_OK) //接收133字节OK，且起始字节正确 { if (BlockCount != strXMODEM.BlockNo)//核对数据块编号正确 { tgt_putchar1(XMODEM_NAK); //数据块编号错误，要求重发当前数据块 continue; } if (BlockCount !=(unsigned char)(~strXMODEM.nBlockNo)) { tgt_putchar1(XMODEM_NAK); //数据块编号反码错误，要求重发当前数据块 continue; } crc=strXMODEM.CRC16hi<<8; crc+=strXMODEM.CRC16lo; //AVR的16位整数是低位在先，XMODEM的CRC16是高位在先 if(calcrc(&strXMODEM.Xdata[0],BLOCKSIZE)!=crc) { tgt_putchar1(XMODEM_NAK); //CRC错误，要求重发当前数据块 dbg_printf("crc error\n"); continue; } //正确接收128个字节数据，刚好是M16的一页 memcpy(base+(filesize&0xfff),strXMODEM.Xdata,128); filesize+=128; tgt_putchar1(XMODEM_ACK); //回应已正确收到一个数据块 BlockCount++; //数据块累计加1 if((filesize&0xfff)==0) program1(base,filesize-0x1000,0x1000); } } if((filesize&0xfff)) program1(base,(filesize&~0xfff),0x1000); //退出Bootloader程序，从0x0000处执行应用程序 tgt_puts("xmodem finished\r\n"); return filesize; } static char blockdata[0x1000]; int xmodem() { int size; int offset; char mode; //clean char buf tgt_puts("xmodem now\r\n"); while(tgt_getchar()!='x') tgt_puts("press x to tranfser\r\n"); //tgt_puts("haha\r\n"); xmodem_transfer(blockdata); while(1); return 0; }