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/*
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* Copyright (C) 2004 Darren Hutchinson (dbh@gbdt.com.au)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
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* License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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* MA 02111-1307, USA.
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*
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* $Id: paddle.h,v 1.2 2004/03/03 07:37:11 dbh Exp $
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*/
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#ifndef _PADDLE_H_
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#define _PADDLE_H_
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/* This file describes the data in the EQ6/Atlas hand paddle serial stream.
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*
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* This is a one-directional serial stream at 935 bits/sec. This is a fairly
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* wierd speed that seems to be used to give an overall serial stream time
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* of 76.2ms [basically the full-step time for siderial rate, which is
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* half of the actual half-step rate].
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*
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* See the file eq6-serial.txt for further details.
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*/
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#include <inttypes.h>
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/* Define the serial rate used by the paddle
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*/
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#define PADDLE_RATE 935L /* Bit rate for the paddle */
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/* The serial stream is a set of 6, 9 bit words. The first three words
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* are for RA control, the second three words are for DEC control.
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*
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* Note that the ordering here is arbitary (through reverse engineering), but
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* seems sensible.
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*
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* Word1: RA sync (B8 = 0)
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* Word2: RA direction (B8 = 0)
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* Word3: RA speed (B8 = 0)
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* Word4: ??? (Assumed to be DEC sync) (B8 = 1)
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* Word5: DEC direction (B8 = 1)
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* Word6: DEC speed (B8 = 1)
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*
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*/
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/* Word #1 - RA SYNC
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*/
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#define RA_SYNC 0x7e
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/* Word #2 - RA DIRECTION
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*/
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#define RA_DIR_BIT 0 // RA Direction bit
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#define RA_DIR_LEFT 0
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#define RA_DIR_RIGHT (1 << RA_DIR_BIT)
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/* Note: Will be 0 for southern hemispere siderial, 1 for northern siderial
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*/
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/* Word #3 - RA SPEED
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*/
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#define RA_SPEED_MASK 0x0f // Speed bits
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#define RA_SPEED_0 0x00 // x2, opposite direction to siderial
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#define RA_SPEED_1 0x01 // No RA button pressed
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#define RA_SPEED_2 0x02 // x2, same direction as siderial
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#define RA_SPEED_8 0x04 // siderial x8
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#define RA_SPEED_16 0x08 // siderial x16
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/* Word #4 - ???. This word always seems to be zero. Assume it's a sync word
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* unless we hear something different
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*/
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#define DEC_SYNC 0x00
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/* Word #5 - DEC DIRECTION
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*/
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#define DEC_DIR_BIT 0 // DEC Direction bit
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#define DEC_DIR_UP 0
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#define DEC_DIR_DOWN (1 << DEC_DIR_BIT)
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/* Word #6 - DEC SPEED
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*/
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#define DEC_SPEED_MASK 0x0f // Speed bits
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#define DEC_SPEED_0 0x00 // No buttons pressed
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#define DEC_SPEED_2 0x02 // siderial x2
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#define DEC_SPEED_8 0x04 // siderial x8
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#define DEC_SPEED_16 0x08 // siderial x16
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/* Prototypes for paddle.c functions that can be called from outside
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*/
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extern void paddleInit(void);
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extern uint8_t paddleDecRate;
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extern uint8_t paddleRaRate;
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extern uint8_t siderialRate;
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/* Configuration variable - sets whether the 2X rate for the paddle should
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* be considered as 1X or 0.3X
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*/
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extern uint8_t paddleGuideRate;
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#endif /* _PADDLE_H_ */
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