/*
** Copyright 2001, Brian Swetland <swetland@frotz.net>
** All Rights Reserved.  Please read the provided LICENSE file.
*/

#ifndef PROTO_H
#define PROTO_H

#include <xtypes.h>

/*  <XFRAME> <ADLER32:U4> <LEN:U2> <CMD:U1> <SEQ:U1> <DATA> ... <DATA> */

#define XFRAME  0xAE
#define XESCAPE 0xAD
#define XESC_AE 0x01
#define XESC_AD 0x02

#define MAXDATA (1024 + 24)
#define HDRSIZE 8
#define MAXPACKET (MAXDATA + HDRSIZE)

typedef struct XIO XIO;

struct XIO {
	u1 buf[MAXPACKET];
	u1 dbg[128 + 8];
	int debugcount;
	int count;
	int nextseq;
	int lastseq;
	int escape;
	int errors;
};

typedef struct xframe {
	u4 a32;
	u2 len;
	u1 cmd;
	u1 seq;
	union {
		u4 w[MAXDATA/4];
		u2 h[MAXDATA/2];
		u1 b[MAXDATA];
	} u;
} xframe;

#define XCMD_ACK     'A'
#define XCMD_ERR     'E'

#define XCMD_READ8   '-' 
#define XCMD_WRITE8  '+'
#define XCMD_READ16  'r' 
#define XCMD_WRITE16 'w'
#define XCMD_READ32  'R' 
#define XCMD_WRITE32 'W'
#define XCMD_CALL    'C'
#define XCMD_PING    'P'
#define XCMD_DEBUG   'd'
#define XCMD_REBOOT  '!'

#define XCMD_FLASH   'F'

#define XCMD_VISOLY  'v'

#define FLASH_WRITE 0x5038001
#define FLASH_ERASE 0x5038002

typedef struct xcmdmap {
	int command;
	int (*handler)(xframe *f);
} xcmdmap;

extern xcmdmap xcommands[];

void xio_init(XIO *xio);
void xio_in(XIO *xio, u1 data);
void xio_out(const u1 *data, int len);
int xio_rpc(XIO *xio, xframe *f);
int xio_wait(XIO *xio, xframe *f);

u4 adler32(u4 adler, const u1 *buf, u4 len);

#endif