xymodem.h

XModem / YModem Source Code

#ifndef __XYMODEM_H_
#define __XYMODEM_H_

#define MODEM_MAX_RETRIES 50   // Received retries
#define MODEM_CRC_RETRIES 51   // >MODEM_MAX_RETRIES for CRC check
#define MODEM_CAN_COUNT    3   // Wait for 3 times CAN before quiting
#define MODEM_EOT_COUNT    1

#define MODEM_SOH  0x01        // start charactor for data block
#define MODEM_STX  0x02
#define MODEM_EOT  0x04
#define MODEM_ACK  0x06
#define MODEM_NAK  0x15
#define MODEM_CAN  0x18
#define MODEM_C    0x43

typedef struct
{
   int           modemtype;
   int           crc_mode;
   int           nxt_num;      // next data block number
   int           cur_num;      // current data block number
   int           len;
   int           rec_err;      // error status for receive
   unsigned char buf[1024];    // data buffer
   unsigned int  filelen;      // File length field for Ymodem
   unsigned char filename[32]; // File name field for Ymodem
}modem_struct;


int  ymodem_init(modem_struct *mblock);
int  modem_recvdata(modem_struct *mblock);
//int crc_16(unsigned char *buf, int len);
void modem_cancle(void);

#endif