/*

** This file is part of fsusb_picdem

**

** fsusb_picdem is free software; you can redistribute it and/or

** modify it under the terms of the GNU General Public License as

** published by the Free Software Foundation; either version 2 of the

** License, or (at your option) any later version.

**

** fsusb_picdem is distributed in the hope that it will be useful, but

** WITHOUT ANY WARRANTY; without even the implied warranty of

** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

** General Public License for more details.

**

** You should have received a copy of the GNU General Public License

** along with fsusb_picdem; if not, write to the Free Software

** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

** 02110-1301, USA

*/

#ifndef __BOOTLOAD_H__

#define __BOOTLOAD_H__

/*

 * Command packets:

 *

 * 0x00: command

 * 0x01: data length (usually; different action for some commands!)

 * 0x02: address bits 7..0

 * 0x03: address bits 15..8

 * 0x04: address bits 23..16 (upper bits always zero)

 * 0x05: data[0]

 * 0x06: data[1]

 * 0x07: data[2]

 * 0x??: ...

 * 0x3f: data[BL_DATA_LEN-1]

 */

typedef unsigned char byte;

#define BL_PACKET_LEN 64

#define BL_HEADER_LEN  5 // command, len, low, high, upper

#define BL_DATA_LEN   (BL_PACKET_LEN - BL_HEADER_LEN)

enum {

  READ_VERSION    = 0x00, // Works

  READ_FLASH      = 0x01, // Works

  WRITE_FLASH     = 0x02, // Works

  ERASE_FLASH     = 0x03, // Works

  READ_EEDATA     = 0x04, // NOT IMPLEMENTED

  WRITE_EEDATA    = 0x05, // NOT IMPLEMENTED

  READ_CONFIG     = 0x06, // NOT IMPLEMENTED

                          // (but in current firmware READ_FLASH works

  WRITE_CONFIG    = 0x07, // NOT TESTED

  UPDATE_LED      = 0x32, // NOT IMPLEMENTED

  RESET           = 0xFF  // NOT IMPLEMENTED

};

typedef union _bl_packet {

  byte _byte[64];

  struct {

    byte command;

    byte len;

    struct {

      byte low;

      byte high;

      byte upper;

    } address;

    byte data[BL_DATA_LEN];

  };

} bl_packet;

#endif /* __BOOTLOAD_H__ */