ac97_example.c

含t h r e a d x,u c o s 的b s p

/***********************************************************************
 * $Workfile:   ac97_example.c  $
 * $Revision:   1.0  $
 * $Author:   WellsK  $
 * $Date:   Jul 07 2003 08:59:12  $
 *
 * Project: AC97 polled mode driver example
 *
 * Description:
 *     A AC97 driver (polled mode) example.
 *
 * Revision History:
 * $Log:   //smaicnt2/pvcs/VM/sharpmcu/archives/sharpmcu/software/csps/lh7a404/bsps/sdk7a404/examples/ac97_polled_play/ac97_example.c-arc  $
 * 
 *    Rev 1.0   Jul 07 2003 08:59:12   WellsK
 * Initial revision.
 * 
 *
 ***********************************************************************
 * SHARP MICROELECTRONICS OF THE AMERICAS MAKES NO REPRESENTATION
 * OR WARRANTIES WITH RESPECT TO THE PERFORMANCE OF THIS SOFTWARE,
 * AND SPECIFICALLY DISCLAIMS ANY RESPONSIBILITY FOR ANY DAMAGES, 
 * SPECIAL OR CONSEQUENTIAL, CONNECTED WITH THE USE OF THIS SOFTWARE.
 *
 * SHARP MICROELECTRONICS OF THE AMERICAS PROVIDES THIS SOFTWARE SOLELY 
 * FOR THE PURPOSE OF SOFTWARE DEVELOPMENT INCORPORATING THE USE OF A 
 * SHARP MICROCONTROLLER OR SYSTEM-ON-CHIP PRODUCT. USE OF THIS SOURCE
 * FILE IMPLIES ACCEPTANCE OF THESE CONDITIONS.
 *
 * COPYRIGHT (C) 2001 SHARP MICROELECTRONICS OF THE AMERICAS, INC.
 *     CAMAS, WA
 **********************************************************************/

#include "abl_types.h"
#include "abl_irq_fiq.h"
#include "lh7a404_ac97_driver.h"
#include "lh7a404_timer_driver.h"
#include "sdk7a404_cpld_driver.h"
#include "sma_whoosh.h"

/***********************************************************************
 *
 * Function: c_entry
 *
 * Purpose: Polled mode AC97 driver example
 *
 * Processing:
 *     See function. This example sets up the CODEC to play a stereo
 *     sample on the PCM output.
 *
 * Parameters: None
 *
 * Outputs: None
 *
 * Returns: Always returns 1
 *
 * Notes: None
 *
 **********************************************************************/
int c_entry(void)
{
    INT_32 xa, ac97dev1, iter;
    AC97_VOLUME_T vol;
    AC97_MIX_GAIN_T mix;
    AC97_TONE_T tone;
    AC97_CHANNEL_CONFIG_T chcfg;

    /* Disable interrupts */
    disable_irq_fiq();

    /* Initialize CPLD */
    cpld_init();

    /* Open the AC97 controller channel #1 */
    if ((ac97dev1 = ac97_open(AAC, 0)) == (INT_32) NULL)
    {
        return 0;
    }

    /* Reset AC97 CODEC power and allow a small delay (300mS) for
       device to re-initialize correctly */
    ac97_ioctl(ac97dev1, AC97_DO_RESET, 1);
    timer_wait_us(TIMER1, (300 * 1000));

    /* Set CODEC volumes to MAX (all CODEC outputs) */
    vol.mute   = FALSE;
    vol.left   = AC97_MAX_VOL;
    vol.right  = AC97_MAX_VOL;
    vol.select = MASTER_OUT;
    ac97_ioctl(ac97dev1, AC97_SET_VOL, (INT_32) &vol);
    vol.select = AUX_OUT;
    ac97_ioctl(ac97dev1, AC97_SET_VOL, (INT_32) &vol);
    vol.select = MONO_OUT;
    ac97_ioctl(ac97dev1, AC97_SET_VOL, (INT_32) &vol);

    /* Mute all CODEC mixer channels */
    mix.mute   = FALSE;
    mix.left   = AC97_MIX_GN_MIN;
    mix.right  = AC97_MIX_GN_MIN;
    for (xa = BEEP_OUT; xa < PCM_OUT; xa++)
    {
        mix.select = (AC97_MIX_GAIN_SEL_T) xa;
        ac97_ioctl(ac97dev1, AC97_SET_MIXGAIN, (INT_32) &mix);
    }

    /* Set PCM output channel to max gain in mixer (volume) */
    mix.mute   = FALSE;
    mix.left   = AC97_REC_GN_MAX;
    mix.right  = AC97_REC_GN_MAX;
    mix.select = PCM_OUT;
    ac97_ioctl(ac97dev1, AC97_SET_MIXGAIN, (INT_32) &mix);

    /* Set bass and treble tone control to bypass */
    tone.bass_gain = AC97_TONE_BYPASS;
    tone.treble_gain = AC97_TONE_BYPASS;
    ac97_ioctl(ac97dev1, AC97_SET_TONE, (INT_32) &tone);

    /* Play sample */
    chcfg.srate = BPSEC_8000;
    chcfg.ssize = BPSAM_16;
    chcfg.compact = FALSE;
    chcfg.dir = PLAYBACK;
    chcfg.tmode = AC97_POLLED;
    chcfg.channels = 2;
    ac97_ioctl(ac97dev1, AC97_SET_CHANNEL, (INT_32) &chcfg);
    chcfg.channels = 2;

    /* Play sample 3 times at different rates */
    for (iter = 0; iter < 3; iter++)
    {
        ac97_ioctl(ac97dev1, AC97_SET_CHANNEL, (INT_32) &chcfg);
        chcfg.srate++;
        
        /* On the Wolfson CODEC, mono samples need to be played as
           stereo samples with the same data on each channel, or the
           CODEC will not request slot data (not sure why) */
        for (xa = 0; xa < (SMA_WHOOSH_NUM_SAMPLES * 2); xa = xa + 2)
        {
            ac97_write(ac97dev1, (UNS_16 *) &sma_whoosh [xa], 2);
            ac97_write(ac97dev1, (UNS_16 *) &sma_whoosh [xa], 2);
        }
    }

    return 1;
}

#ifndef __GNUC__
/* With ARM and GHS toolsets, the entry point is main() - this will
   allow the linker to generate wrapper code to setup stacks, allocate
   heap area, and initialize and copy code and data segments. For GNU
   toolsets, the entry point is through __start() in the crt0_gnu.asm
   file, and that startup code will setup stacks and data */
int main(void)
{
    return c_entry();
}
#endif