irqshare.h

一个两碟控制的VCD的代码,两碟之间的转动及连续播放,已大量生产的CODE.

/* Copyright 1996-1997, ESS Technology, Inc. */
/* SCCSID @(#)irqshare.h	1.1 12/2/97 */

/*
 * This is the #define stuff for the access to the
 * LCS0# address range for GAL16V8 interrupt sharing
 *
 *  XOR1 gate is used for subcode-Q interrupt control
 *  XOR2 gate is used for IR interrupt control
 *
 *  External XOR1 gate is set to 1 by write to  0x18010000
 *  External XOR1 gate is set to 0 by read from 0x18010000
 *  External XOR2 gate is set to 1 by write to  0x18020000
 *  External XOR2 gate is set to 0 by read from 0x18020000
 *  
 *  The following information is read from 0x18018000
 *    D0 = SQ Interrupt   (after the XOR2 gate)
 *    D1 = IR Interrupt   (after the XOR1 gate)
 *    D2 = IN0 
 *
 *  The following information is read from 0x18080000
 *    D2 = IN1
 *
 *  Notice SQCK is still driven at address 0x18000000
 *
 * by Andy Ho
 */

#ifndef _COMMON_H_
#include "common.h"
#endif

/*
 * GBLDEF(unsigned int x18010000, 0x18010000);
 * GBLDEF(unsigned int x18018000, 0x18018000);
 * GBLDEF(unsigned int x18020000, 0x18020000);
 * GBLDEF(unsigned int x18008000, 0x18008000);
 */

#define SET_XOR1	*(int *) 0x18010000 = reg0
#define CLEAR_XOR1	reg0 = *(int *) 0x18010000

#define SET_XOR2	*(int *) 0x18020000 = reg0
#define CLEAR_XOR2	reg0 = *(int *) 0x18020000

#define READ_IRQ(x)	x = *(unsigned int *) 0x18018000
#define READ_IN0(x)	x = *(unsigned int *) 0x18018000
#define READ_IN1(x)	x = *(unsigned int *) 0x18008000

#define SQ_INT_HIGH(x)	(x & 0x1)
#define SQ_INT_LOW(x)	!(x & 0x1)

#define IR_INT_HIGH(x)	(x & 0x2)
#define IR_INT_LOW(x)	!(x & 0x2)

#define IN0_HIGH(x)	(x & 0x4)
#define IN0_LOW(x)	!(x & 0x4)

#define IN1_HIGH(x)	(x & 0x4)
#define IN1_LOW(x)	!(x & 0x4)