XModem Transmit/Receive Implementation with CRC and 1K support (xmodem.c)
[General Libraries]

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Detailed Description

 #include "xmodem.h" 

Overview

This XModem implementation supports both 128b and 1K packets with or without CRC checking. The xmodem library must be initialized to use a particular I/O stream by passing appropriate getbyte() and sendbyte() functions to xmodemInit(). The xmodem transfer routines also expect function pointers to read and write data blocks on the local system. While this use of function pointers increases code size, it has great adaptability. The generalized read/write data functions mean that it is easy to pipe data to/from any storage device like EEPROMs or flash cards, rather than being limited to just processor RAM.

Defines
#define	SOH   0x01
#define	STX   0x02
#define	EOT   0x04
#define	ACK   0x06
#define	NAK   0x15
#define	CAN   0x18
#define	CTRLZ   0x1A
#define	XMODEM_TIMEOUT_DELAY   1000
#define	XMODEM_RETRY_LIMIT   16
#define	XMODEM_ERROR_REMOTECANCEL   -1
#define	XMODEM_ERROR_OUTOFSYNC   -2
#define	XMODEM_ERROR_RETRYEXCEED   -3
Functions
void	xmodemInit (void(*sendbyte_func)(unsigned char c), int(*getbyte_func)(void))
	initialize xmodem stream I/O routines
long	xmodemReceive (int(*write)(unsigned char *buffer, int size))
	xmodem receive
long	xmodemTransmit (int(*read)(unsigned char *buffer, int size))
	xmodem transmit
int	xmodemCrcCheck (int crcflag, const unsigned char *buffer, int size)
	xmodem CRC/checksum error checking
int	xmodemInTime (unsigned short timeout)
	get incoming character (wait for timeout)
void	xmodemInFlush (void)
	flush incoming character stream

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