audio.c

IT projecotr reference design.

/****************************************************************************/
/*             TEXAS INSTRUMENTS PROPRIETARY INFORMATION                    */
/*                                                                          */
/*  (c) Copyright, Texas Instruments Incorporated, 2006.                    */
/*      All Rights Reserved.                                                */
/*                                                                          */
/*  Property of Texas Instruments Incorporated. Restricted Rights -         */
/*  Use, duplication, or disclosure is subject to restrictions set          */
/*  forth in TI's program license agreement and associated documentation.   */
/****************************************************************************/

/****************************************************************************/
/* audio.c                                                                  */
/*                                                                          */
/* Controls audio device                                                    */
/****************************************************************************/

#include "common.h"
#include "gpio.h"
#include "pwm.h"

#include "audio.h"
#include "gpioFunction.h"
#include "sysmon.h"
#include "dbmessage.h"

EXEC_CC_ENUM audio_init( void )
{
    /* initialize gpio pin, and set 0% duty cycle */
    GPIO_EnableAlternativeFunction( GPIO_PWM_OUT_4, FALSE );
    GPIO_SetPinConfig( GIO_VOLUME, GIOCFG_OUTPUT, FALSE, GIOCFG_ACTIVE );
    
    return EXEC_CC_PASS;
}

EXEC_CC_ENUM audio_powerNormal( void )
{
              /* for now, set the volume to 100% when entering normal power */
    audio_SetVolume( 100 );
    
    return EXEC_CC_PASS;
}


EXEC_CC_ENUM audio_powerStandby( void )
{
    audio_SetVolume( 0 );
    
    return EXEC_CC_PASS;
}


void audio_SetVolume( uint08 volume )
{    
    PWM_OutConfigStruct pwmCfg;

    if( volume == 0 )
    {
        GPIO_EnableAlternativeFunction( GPIO_PWM_OUT_4, FALSE );
        GPIO_SetPinConfig( GIO_VOLUME, GIOCFG_OUTPUT, FALSE, GIOCFG_ACTIVE );
    }
    else if( volume == 100 )
    {
        GPIO_EnableAlternativeFunction( GPIO_PWM_OUT_4, FALSE );
        GPIO_SetPinConfig( GIO_VOLUME, GIOCFG_OUTPUT, TRUE, GIOCFG_ACTIVE );
    }
    else
    {
        GPIO_EnableAlternativeFunction( GPIO_PWM_OUT_4, TRUE );
        
        pwmCfg.FreqHz = 100000;                    /* configure for 100 kHz */
        pwmCfg.DutyCycle = volume;
        pwmCfg.PortEnabled = TRUE;
        pwmCfg.OutputEnabled = TRUE;

        PWM_SetOutPortConfig( PWM_OUT4, &pwmCfg );
    }
}