iis.c

华恒瑞科公司的S3C44B0开发板音频测试程序

//***************************************************************************
//	wave文件格式
//	任何wave文件,从字符串"data"后开始是4字节的PCM数据长度,接着为PCM裸数据
//	wave文件可以用 advanced mp3/wma recorder 软件生成

//	对于该软件生成的441khz,16bit立体声文件,0x36偏移处开始为4字节的PCM数据长度,接着为PCM裸数据
//	加上串口接收时的4byte的文件长度头应该是0x3a处开始,PCM数据从0x3e处开始

//	windows格式的wave文件,0x28偏移处开始为4字节的PCM数据长度,接着为PCM裸数据
//	加上串口接收时的4byte的文件长度头应该是0x2c处开始,PCM数据从0x30处开始

//	samplesize=*(pWave+0x2c) | *(pWave+0x2d)<<8 | *(pWave+0x2e)<<16 | *(pWave+0x2f)<<24;
//	i=0;
//	do
//	{
//		memcpy((char *)str_data,(char *)(pWave+i),4);
//		printf("%d = %s",i,(char *)(pWave+i));
//		printf("str= %s",str_data);
//		i++;
//	}while(strncmp(str_data,"data",4)!=0);
//	i+=3;
//	samplesize=*(pWave+i) | *(pWave+i+1)<<8 | *(pWave+i+2)<<16 | *(pWave+i+3)<<24;
//***************************************************************************

#include "44b.h"
#include "def.h"
#include "iis.h"
#include "utils.h"

typedef struct tWAVEFORMATEX{
	U16 wFormatTag;
	U16 nChannels;
	U32 nSamplesPerSec;
	U32 nAvgBytesPerSec;
	U16 nBlockAlign;
	U16 wBitsPerSample;
	U16 cbSize;
}WAVEFORMATEX, *LPWAVEFORMATEX;

#define	WAVE_FORMAT_PCM	0x0001

void __irq BDMA0_Done(void);

void Init_4334(void)
{
}

/****************************************************************************
Name	:  	Play_SmallWave
Function:	播放1M以下的wav文件,采用DMA方式
Input	:	addr----------wav文件起始地址
			samplesize----wav文件长度
Return	:	
说明	:	
****************************************************************************/
void Play_SmallWave(U32 addr, U32 size)
{
    unsigned char *pWave;
    U32 samplesize;
    U32 save_PLLCON;

//	ChangePllValue(0x69,0x17,0x0);	//MCLK=45.1584MHz <-- 5.6448MHz*8
	save_PLLCON = rPLLCON;
	rPLLCON = (0x69<<12)|(0x17<<4)|0;
	SerialChgBaud(115200);

    pISR_BDMA0=(unsigned)BDMA0_Done;

    rINTMSK=~(BIT_GLOBAL|BIT_BDMA0);

	pWave=(unsigned char *)addr;
	pWave+=0x28;	//指向wav采样长度
    samplesize=*(pWave+0) | *(pWave+1)<<8 | *(pWave+2)<<16 | *(pWave+3)<<24;
    pWave+=4;	//指向wav数据
    samplesize=(samplesize>>1)<<1;
    printf("\nsample start:0x%x",pWave);
    printf("\nsample size:0x%x",samplesize);

    Init_4334();
    /****** IIS Initialize ******/
    rIISCON=0x22;	//Tx DMA enable,Rx idle,prescaler enable
    rIISMOD=0x89;	//Master,Tx,L-ch=low,iis,16bit ch.,codeclk=256fs,lrck=32fs
//    rIISPSR=0x11;	//Prescaler_A/B enable, value=1
    rIISPSR=0x33;	//Prescaler_A/B enable, value=3
    rIISFCON=0xa00;	//Tx/Rx DMA,Tx/Rx FIFO --> start piling....

    /****** BDMA0 Initialize ******/
    rBDISRC0=(1<<30)+(1<<28)+(U32)pWave;	//Half word,inc,pWave
    rBDIDES0=(1<<30)+(3<<28)+((U32)rIISFIF);	//M2IO,fix,IISFIF
    rBDICNT0=(1<<30)+(1<<26)+(3<<22)+(1<<21)+(0<<20)+samplesize;
    rBDICNT0 |= (1<<20);//enable
    //iis,reserve,done_int,auto-reload/start,DMA enable,COUNT
    rBDCON0 = 0x0<<2;

    printf("\nNow play the wave file ...");
    printf("\nPush any key to exit!!!");
    /****** IIS Tx Start ******/
    rIISCON |=0x1;
    while(!getkey());

    /****** IIS Tx Stop ******/
    rIISCON=0x0;    //IIS stop
    rBDICNT0=0x0;   //BDMA stop

    rINTMSK=BIT_GLOBAL;
	//ChangePllValue(136, 8, 1);//Fin=10MHz, Fout=72MHz
	rPLLCON = save_PLLCON;
	SerialChgBaud(115200);
}

void __irq BDMA0_Done(void)
{
    rI_ISPC=BIT_BDMA0;	//clear pending bit
    WrUTXH0('#');
}

/****************************************************************************
Name	:  	Play_BigWave
Function:	播放1M以上的wav文件,采用normal方式
Input	:	addr----------wav文件起始地址
			samplesize----wav文件长度
Return	:	
说明	:	
****************************************************************************/
void Play_BigWave(U32 addr, U32 size)
{
	int i;
    unsigned char *pWave;
    unsigned short *pSteroWave;
    U32 samplesize,start;
    U32 save_PLLCON;
    LPWAVEFORMATEX pWav;
    
    if(!download_len)
    	return;
   	
	pWav = (LPWAVEFORMATEX)(addr+0x14);
	if(pWav->wFormatTag!=WAVE_FORMAT_PCM) {
		puts("Supported PCM format only\n");
		return;
	}
	if(pWav->nChannels!=2) {
		puts("Support stereo wave only\n");
		return;
	}	
	printf("Sample rate =%dHz\n", pWav->nSamplesPerSec);
	
	 //	ChangePllValue(0x69,0x17,0x0);	//MCLK=45.1584MHz <-- 5.6448MHz*8
	save_PLLCON = rPLLCON;
	rPLLCON = (0x69<<12)|(0x17<<4)|0;
	SerialChgBaud(115200);

	pWave=(unsigned char *)addr;
	pWave+=0x28;	//指向wav采样长度
    samplesize=*(pWave+0) | *(pWave+1)<<8 | *(pWave+2)<<16 | *(pWave+3)<<24;
    pWave+=4;
    start=(U32)(unsigned char *)pWave;	//指向wav数据
    pSteroWave=(U16 *)start;
    samplesize=(samplesize>>1)<<1;
    printf("\nsample start:0x%x",pWave);
    printf("\nsample size:0x%x",samplesize);

    Init_4334();
    /****** IIS Initialize ******/
    rIISCON=0x02;	//Tx DMA disable,Rx idle,prescaler enable
    rIISMOD=0x89;	//Master,Tx,L-ch=low,iis,16bit ch.,codeclk=256fs,lrck=32fs
//    rIISPSR=0x11;	//Prescaler_A/B enable, value=1
    rIISPSR=0x33;	//Prescaler_A/B enable, value=3
    rIISFCON=0x200;	//Tx/Rx normal,Tx FIFO enable--> start piling....

    printf("\nNow play the wave file ...");
    printf("\nPush ESC key to exit!!!");
    /****** IIS Tx Start ******/
    rIISCON |=0x1;
    while(getkey()!=ESC_KEY)
    {
    	if(IIS_FIFOREADY)
    	{
    		for(i=0;i<8;i++)
    		{
    			*rIISFIF = *pSteroWave++;
//    			printf("\n0x%x:0x%x",pSteroWave,*pSteroWave);
    		}
    			
    		if( ((U32)pSteroWave-start) > samplesize )
    		{
//    			printf("\n0x%x-0x%x=0x%x:0x%x",pSteroWave,start,((U32)pSteroWave-start),samplesize);
    			pSteroWave=(U16 *)start;
    			WrUTXH0('#');
    		}
    	}
    }

    /****** IIS Tx Stop ******/
    rIISCON=0x0;    //IIS stop

	SerialTxEmpty();
	rPLLCON = save_PLLCON;
	//ChangePllValue(0x2a,0x3,0x1);//Fin=10MHz, Fout=50MHz
	SerialChgBaud(115200);
}

void IISMain(void)
{
	Play_BigWave(download_addr, download_len);
}