spdif.c

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.

/* SCCSID @(#)spdif.c	1.5 6/16/97 */

#ifdef SPDIF

#include "common.h"
#include "mvd.h"
#include "vcxi.h"
#include "ioport.h"
#include "spdif.h"
#include "buffer.h"

#define tdmxmtslots tdmxmtslots0

#define PRINTF(a)

#ifdef OUT32BITS
#define XMTSLOTS 0xff
#else
#define XMTSLOTS 0x66
#endif

#define RCVSLOTS 0x66

/******************************************************************************
 Initialise S/PDIF input.
 ******************************************************************************/
void SPDIF_in_init(void)
{
    int *cs8411 = (int *)0x14000000;

    PRINTF(("SPDIF_out_int()\n"));
    cs8411[2] = 0;	/* reset */
    cs8411[3] = 0;      /* slave FSYNC and SCK */

    if (vcx_xfer_mode == 6) {
    	cs8411[3] = 0xbb;    /* ROER, SDF=011, FSF=10, master, falling edge */
        cs8411[2] = 0x81;    /* FSYNC from data, buffer mode 0 */
    }
}

/******************************************************************************
 Initialise S/PDIF output.
 ******************************************************************************/
#ifdef OUT32BITS
#define OUTI2S 0x08	/* SDF=000, FSF=10, slave, falling edge. */
#else
#define OUTI2S 0x28	/* SDF=010, FSF=10, slave, falling edge. */
#endif

void SPDIF_out_init(void)
{
    int i;
    int *cs8401a = (int *)0x14000100;
    int *cs8411 = (int *)0x14000000;
    cs8411[2] = 0;	/* reset */

    PRINTF(("SPDIF_out_int()\n"));

    /* Transparent mode off. All int disabled. */
    cs8401a[1] = 0;

    /* 256FS. Always valid. Buffer mode 0. No CRCC. Mute and Reset. */
    cs8401a[2] = 0x80;

    /* I2S format is here */
    if (vcx_xfer_mode == 6)
    	cs8401a[3] = OUTI2S & ~2;	/* Force slave mode */
    else
    	cs8401a[3] = OUTI2S;

    /* Initialise user data, which we don't use. */
    for (i=4; i<8; i++) {
	cs8401a[i] = 0;
    }

    /* Channel status byte 0, CONTROL and MODE */
    /* Consumer use, 2 channel w/o pre-emphasis, copy prohibited, mode 0. */
    cs8401a[8] = 0;
    cs8401a[9] = 0;	/* Category 0 */
    cs8401a[10] = 0;	/* Source # don't care. Channel # don't care */
    cs8401a[11] = 0x40;	/* 48KHz, Level II accuracy whatever that means */

    /* Clear the rest of the channel status word. */
    for (i=12; i<32; i++) {
	cs8401a[i] = 0;
    }

#if 0
    SET_AUX4;
    TRISTATE_AUX4;
#endif

    PRINTF(("Done SPDIF_out_int()\n"));
}

#if 0
int SPDIF_n_int = 0;
/******************************************************************************
 S/PDIF output interrupt service.
 ******************************************************************************/
void SPDIF_out_interrupt_service(void)
{
    int *cs8401a = (int *)0x14000100;

    mvd[riface_clear_dbgirq] = 0;
    SPDIF_n_int++;

    cs8401a[1] = 0x84;	/* Set BKST */
}
#endif

#endif