xmodem.h

ARM入门的好帮手.包含了从简单到相对较复杂的程序.

//*----------------------------------------------------------------------------
//*      ATMEL Microcontroller Software Support  -  ROUSSET  -
//*----------------------------------------------------------------------------
//* The software is delivered "AS IS" without warranty or condition of any
//* kind, either express, implied or statutory. This includes without
//* limitation any warranty or condition with respect to merchantability or
//* fitness for any particular purpose, or against the infringements of
//* intellectual property rights of others.
//*----------------------------------------------------------------------------
//* File Name           : xmodem.h
//* Object              : Xmodem description file
//*
//* 1.0 14/11/00 JPP    : Creation
//*----------------------------------------------------------------------------

#ifndef xmodem_h
#define xmodem_h
#include "periph/stdc/std_c.h"          /* TRUE/FALSE definition */
/*---------------------------  Constants definition -------------------------*/
/* Control Characters */
#define SOH         0x01            /* Start of Heading */
#define EOT         0x04            /* End of transmission */
#define ACK         0x06            /* Acknowledge */
#define NAK         0x15            /* Negative Acknowledge */

#define CRCCHR      'C'

#define FULL        TRUE
#define EMPTY       FALSE

#define OK          TRUE
#define NOK         FALSE

#define CRC16POLY   0x1021              /* CRC 16  polynom */

#define XMODEM_DATA_SIZE    128         /* data 128 */
#define XMODEM_FRAME_SIZE   (3+XMODEM_DATA_SIZE+2)   /* Header 3, data 128, CRC 2 */

#define NB_FRAME	3
/*---------------------------  Structure definition -------------------------*/

// Xmodem frame structure
typedef __packed struct XmodemFrame
{
    unsigned char   Header ;
    unsigned char   packet ;
    unsigned char   packet_crc ;
    unsigned char   data[XMODEM_DATA_SIZE];
    unsigned char   crc_lsb;
    unsigned char   crc_msb;

} XmodemFrame ;

/*---------------------------  Function Prototyping -------------------------*/

extern int xmodem_receive(int (*write_function)(u_char *ptr_data,int size));
extern int xmodem_transmit(u_char *bufptr,u_int len);

#endif /* xmodem_h */