ac97.c

基于一款32位嵌入式微处理器的音频接口的测试代码

/*************************************************************************************
*	Copyright (c) 2005 by National ASIC System Engineering Research Center.
*	PROPRIETARY RIGHTS of ASIC are involved in the subject matter of this 
*	material.  All manufacturing, reproduction, use, and sales rights 
*	pertaining to this subject matter are governed by the license agreement.
*	The recipient of this software implicitly accepts the terms of the license.
*
*	File Name: ac97.c
*
*	File Description:
*			The file includes three functions to initialize the lcd controller and
*		display some pictures on the lcd.
*
*	Function Description:
*		STATUS	ModuleAc97(void)
*								The top function of AC97 experiment.
*
*	Created by Michael <[e-mail]>, 2005-03-31
**************************************************************************************/

#include "garfield.h"

#define REPEAT

int count = 1;
U32 framebase = 0x30500000;

int main(void)
{
	char *s;
	s="error in rtc lab\n";
    if(E_OK != ModuleAc97()){
		#ifndef USB_ICE
		   printf("error in rtc lab\n");
		#else 
		    print(s);
		#endif
		}
	while(1);
	
	return 1;
}

STATUS	ModuleAc97(void)
{
	/* system initialized */
	system_init();
	
	/* if need play mp3 repeatly, open rtc interrrupt mask */
#ifdef	REPEAT
	unmask_irq(INT_DMA);
#endif
	
	InitAC97();
	ConfigureDMA();

	return E_OK;
}

void ConfigurationCodec(int i)
{

//_________________________________________________________________
//**********open Master Volume Register,ADDR: 02H
	 *(RP)AC97_CRAC=WRITE+ 0x20000 + 0x1010;		//0dB attenuation
	do{}while(!OVER_WRITE);

//_________________________________________________________________
//**********open Master Volume MONO,ADDR:06H
//	 *(RP)AC97_CRAC=WRITE + 0x60000 + 0x0;		//0dB attenuation
//	do{}while(!OVER_WRITE);


//_________________________________________________________________
//*********open MIC Volume,ADDR:0eH
	*(RP)AC97_CRAC=WRITE + 0xe0000 + 0x8;		//0dB attenuation
	do{}while(!OVER_WRITE);

//_________________________________________________________________
//*********open MIC Volume,ADDR:0eH
	*(RP)AC97_CRAC=WRITE + 0x6a0000 + 0x50;		//0dB attenuation
	do{}while(!OVER_WRITE);

//________________________________________________________________
//********open Extend Audio Status and Control Register,ADDR:2AH
	if(i)
		{
		*(RP)AC97_CRAC=WRITE + 0x2a0000 + 0x0;		//	fixed sample
		do{}while(!OVER_WRITE);
		}
	else
		{
		*(RP)AC97_CRAC=WRITE + 0x2a0000 + 0x1;		//	VRA sample
		do{}while(!OVER_WRITE);
		
		//PCM DAC Rate,ADDR:2CH.  For example :1b80:7040Hz
        //*(RP)AC97_CRAC=WRITE +0x2c0000 + 0xbb80;      //48kHz
		*(RP)AC97_CRAC=WRITE +0x2c0000 + 0xac44;      //44.1Khz
		//*(RP)AC97_CRAC=WRITE +0x2c0000 + 0x7d00;      //32Khz 
		//*(RP)AC97_CRAC=WRITE +0x2c0000 + 0x5dc0;      //24hz
		//*(RP)AC97_CRAC=WRITE +0x2c0000 + 0x5622;      //22hz
		//*(RP)AC97_CRAC=WRITE +0x2c0000 + 0x3e80;      //16hz
		//*(RP)AC97_CRAC=WRITE +0x2c0000 + 0x1f40;      //8Khz
		do{}while(!OVER_WRITE);

		//PCM ADC Rate,ADDR:32H.  For example :1b80:7040Hz
		//*(RP)AC97_CRAC=WRITE +0x320000 + 0xbb80;      //48kHz
		*(RP)AC97_CRAC=WRITE +0x320000 + 0xac44;      //44.1Khz
		//*(RP)AC97_CRAC=WRITE +0x320000 + 0x7d00;      //32Khz
		//*(RP)AC97_CRAC=WRITE +0x320000 + 0x5dc0;      //24hz
		//*(RP)AC97_CRAC=WRITE +0x320000 + 0x5622;      //22hz
		//*(RP)AC97_CRAC=WRITE +0x320000 + 0x3e80;      //16hz
		//*(RP)AC97_CRAC=WRITE +0x320000 + 0x1f40;      //8Khz 
		do{}while(!OVER_WRITE);
		}
}

void ConfigurationAC97(int type)
{
	if (type)
	{
	
		*(RP)AC97_OCR=0x00010001;		//open L/R channel,and set fixed sample rate	
		*(RP)AC97_ICR=0x00000000;		//open Input channel,and set fixed sample rate	
	}
	else
	{
		*(RP)AC97_OCR=0x00030003;	//open L/R channel,and set variable sample rate	
		*(RP)AC97_ICR=0x00000000;		//open Input channel,and set variable sample rate	
	}

	//_________________________________________________________________
	//**********configure the register INT_ENABLE
	*(RP)AC97_INT_ENABLE=0xbf;	//open all the interrupt

	//_________________________________________________________________
	//**********configure the register AC97_ENABLE for open modual AC97
	*(RP)AC97_ENABLE=0x1;
	
	return ;
}

void ConfigureDMA(void)
{
	*(RP)DMA_SA=(U32)framebase;
	*(RP)DMA_DA=AC97_OUT_FIFOADDR;
	*(RP)DMA_CTRL=0x03ffd4ad;		//modified for future
	*(RP)DMA_ENABLE=0x2003;
	
	return ;
}

void InitAC97(void)
{
//_________________________________________________________________
//*********Reset AC97
	*(RP)AC97_CONR=0X3;	

//_________________________________________________________________
//**********Reset Codec 
	*(RP)AC97_CRAC=WRITE + 0x0 + 0x1;
	do{}while(!OVER_WRITE);

//_________________________________________________________________
//************configure Codec,	
//Note: first configure Codec,then AC97;
	ConfigurationCodec(VRA_SAMPLE);
	ConfigurationAC97(VRA_SAMPLE);

//_________________________________________________________________
//**********configure the register INT_CLEAR
		if (*(RP)AC97_INT_STATUS!=0x0)
		{
			*(RP)AC97_INT_CLEAR=0x1;	//after writing in INT_CLEAR,INT_STATUS must be zero
		}
}


void dma_handler(void)
{
	*(RP)DMACIntTCClear=0X01;
	*(RP)DMACIntTCClear=0X00;

	if(count <= 34){
		*(RP)DMA_SA=(U32)framebase + (count++)*0x3ffc;
		*(RP)DMA_CTRL=0x03ffd4ad;		//modified for future
		*(RP)DMA_ENABLE=0x2003;
	}

	return ;
}