ac97.c

嵌入式系统关于串口传输、触摸屏、定时器、控制器、中断处理、音频控制等实验代码

#ifndef DEBUG_AC97
#define DEBUG_AC97
#endif

#include "stdio.h"
#include "stdlib.h"
#include "XsAc97CtrlApi.h"
#include "XsAc97Ctrl.h"
#include "dma.h"
#include "pcm.h"
#include "CS4201.h"

#include "UtilFunc.h"
#include "XsUartDrv.h"

extern unsigned char ppcm[];	// PCM data

void * Make16BytesAlign(void * ptr)
{
	unsigned p = (UINT32)ptr;
    void *ptr2;
	if (p & 0x0F)	
		ptr2 = (void *)((p & 0xFFFFFFF0) + 16);
	else			
		ptr2 = (void *)(p & 0xFFFFFFF0);
	return ptr2;
}
#ifndef DEBUG_AC97

#define LENGTH_OF_TRANS		0x00001000
#define PCMLength			470016
#define n8k					115  //(PCMLength/LENGTH_OF_TRANS)

XsDmaDescriptorGroupT  		PCMDesGrp[n8k+1];
#else
#define LENGTH_OF_TRANS		0x00001000
#define PCMLength			0x2000
#define n8k					2
    char DesArea[256]; //leave space for DMA descriptor
    XsDmaDescriptorGroupT *PCMDesGrp;
#endif

XsDmaDescriptorGroupT * initdesc()
{
#ifndef DEBUG_AC97    
	INT32 i;
	XsDmaDescriptorGroupT * pdesc;
	unsigned char * ppcmout = (unsigned char *)Make16BytesAlign(ppcm);	// 16 byte align

    print_string("In initdesc\r\n");
	pdesc = (XsDmaDescriptorGroupT *)Make16BytesAlign(&PCMDesGrp);	

	for (i=0; i<n8k; i++)
	{
		pdesc->DDADR = (UINT32)(pdesc + 1);
		pdesc->DSADR = (UINT32)ppcmout;
		pdesc->DTADR = (UINT32)&(XsAc97CtrlRegsP->PCDR);		// audio transmit FIFO (0x40500040)
		// [31]		increment Src Addr
		// [28]		FLOWTRG
		// [17:16]	11b - 32 bytes Maxim Burst Size of each transfer
		// [15:14]	11b - Word Width
		// [12,0]	Length of transfer in bytes
		pdesc->DCMD = 0x9003C000 | LENGTH_OF_TRANS;
		pdesc ++;
		ppcmout += LENGTH_OF_TRANS;	// skip 8k bytes
	}
	pdesc --;
	pdesc->DDADR = (UINT32)pdesc;

    print_string("Dumping descriptor in initdesc\r\n");
    Dump_Bin((unsigned)pdesc,n8k*4);
	return (XsDmaDescriptorGroupT *)Make16BytesAlign(&PCMDesGrp);
#else
    INT32 i,j;
	XsDmaDescriptorGroupT * pdesc;
	unsigned short * ppcmout = (unsigned short *)Make16BytesAlign(ppcm);	// 16 byte align
    for (i=0,j=0;i<0x2000/sizeof(unsigned short);i++,j=(j+10)%1000)
    {
        ppcmout[i] = SampleTable[j]; //16K 480KHz sine data
    }
        

	PCMDesGrp = (XsDmaDescriptorGroupT *)Make16BytesAlign(DesArea);	
    pdesc = PCMDesGrp;
    
	for (i=0; i<n8k; i++)
	{
		pdesc->DDADR = (UINT32)(pdesc + 1);
		pdesc->DSADR = (UINT32)ppcmout;
		pdesc->DTADR = (UINT32)&(XsAc97CtrlRegsP->PCDR);		// audio transmit FIFO (0x40500040)
		// [31]		increment Src Addr
		// [28]		FLOWTRG
		// [17:16]	11b - 32 bytes Maxim Burst Size of each transfer
		// [15:14]	11b - Word Width
		// [12,0]	Length of transfer in bytes
		pdesc->DCMD = 0x9003C000 | LENGTH_OF_TRANS;
		pdesc++;
		ppcmout += LENGTH_OF_TRANS/sizeof(unsigned short);	// skip 8k bytes
	}
	pdesc--;
	pdesc->DDADR = (UINT32)PCMDesGrp;
	
	return PCMDesGrp;
#endif    
}

void initpcmoutdma(UINT32 channel, XsDmaDescriptorGroupT * pdesc)
{
}
#define	LENGTH_OF_PCMINBUF	1024
unsigned char szpcmin[LENGTH_OF_PCMINBUF];
UINT32 initpcmindma(UINT32 channel)
{
	XsDmaDescriptorGroupT * ppcmindesc 
		= (XsDmaDescriptorGroupT *)malloc(sizeof(XsDmaDescriptorGroupT) * 2);
	if (!ppcmindesc)	return 1;
	ppcmindesc = (XsDmaDescriptorGroupT *)Make16BytesAlign(ppcmindesc);
	
	// build descriptor for pcm in
	{
		ppcmindesc->DDADR = (UINT32)ppcmindesc;
		ppcmindesc->DSADR = (UINT32)&(XsAc97CtrlRegsP->PCDR);		// audio receive FIFO (0x40500040)
		ppcmindesc->DTADR = (UINT32)Make16BytesAlign(szpcmin);
		// [30]		increment Trg Addr
		// [29]		FLOWSRC
		// [17:16]	11b - 32 bytes Maxim Burst Size of each transfer
		// [15:14]	11b - Word Width
		// [12,0]	Length of transfer in bytes
		ppcmindesc->DCMD = 0x6003C000 | (LENGTH_OF_PCMINBUF & 0xFFFFFFE0);
	}
	
	XsDmaControlRegsP->DCSR[channel] &= 0x7FFFFFFF;	// RUN = 0
	while (!(XsDmaControlRegsP->DCSR[channel] & 0x08))	
		Util_DelayUs(1);
	XsDmaControlRegsP->DCSR[channel] = 0x0;
	XsDmaControlRegsP->DRCMR[XSDMA_DRCMR_ID_AC97_AUDIO_RX] = channel | 0x080u;
	XsDmaControlRegsP->DDG[channel].DDADR = ((UINT32)ppcmindesc);
	
	return 0;
}

void startdma(UINT32 channel)
{
	XsDmaControlRegsP->DCSR[channel] |= 0x80000000;	// RUN = 1
}

UINT32 intiac97ctrlfifo()
{
	return 0;
}

UINT32 initac97audiocodec()
{
	UINT32 status;
	
	// disable loopback mode
	status = XsAc97CtrlWriteCodecReg(XS_AC97CTRL_CM_ID_PRI_CODEC, 
		UCB_GPR, 0);
	if (status)	return status;

	// SL[10:8] 100=Line In L; SR[2:0] 100=Line In R
	status = XsAc97CtrlWriteCodecReg(XS_AC97CTRL_CM_ID_PRI_CODEC, 
		UCB_RSR, UCB_RSR_SR_LINE | UCB_RSR_SL_LINE);
	if (status)	return status;
	
	//set record gain
	status = XsAc97CtrlWriteCodecReg(XS_AC97CTRL_CM_ID_PRI_CODEC, 
		UCB_RGR, 0);
	if (status)	return status;

	//enable Variable Rate Audio mode
	status = XsAc97CtrlWriteCodecReg(XS_AC97CTRL_CM_ID_PRI_CODEC, 
		UCB_EASCR, UCB_EAIDR_VRA);
	if (status)	return status;

	//48 kHz
	status = XsAc97CtrlWriteCodecReg(XS_AC97CTRL_CM_ID_PRI_CODEC, 
		UCB_ADR, UCB_DR_48000);
	if (status)	return status;
	
	//set volume: bit13~8 - ML; bit5~0 - MR
	status = XsAc97CtrlWriteCodecReg(XS_AC97CTRL_CM_ID_PRI_CODEC, 
		UCB_MVR, 0x303); 
	if (status)	return status;
	
	status = XsAc97CtrlWriteCodecReg(XS_AC97CTRL_CM_ID_PRI_CODEC, 
		UCB_HVR, 0x303); 
	if (status)	return status;
	
	status = XsAc97CtrlWriteCodecReg(XS_AC97CTRL_CM_ID_PRI_CODEC, 
		UCB_MNVR, 0x303); 
	if (status)	return status;
	
	status = XsAc97CtrlWriteCodecReg(XS_AC97CTRL_CM_ID_PRI_CODEC, 
		UCB_POUTVR, 0x303); 
	if (status)	return status;

	return status;
}

void playpcm(void)
{
	UINT32 DDADR, DSADR, DTADR, DCMD, tmp;
	UINT32 channel = 3;
	XsDmaDescriptorGroupT * pdesc;
    
    PrintfUartDef("In playpcm!\r\n");
    pdesc = initdesc();
	if (!pdesc)	
		return;
	
	if (intiac97ctrlfifo())	
		return;
	
	PrintfUartDef("     To init AC97 codec\r\n");
	initac97audiocodec();

	PrintfUartDef("     To init AC97 dma\r\n");
	
	initpcmoutdma(channel, pdesc); 

	//Waiting for current DMA End	
  	tmp = XsDmaControlRegsP->DCSR[channel];
	XsDmaControlRegsP->DCSR[channel] &= 0x7FFFFFFF;	// RUN = 0

	tmp = 0;
    PrintfUartDef("     Waiting channel to be not busy (channel %d)\r\n",channel);
	while (!tmp)
	{
		tmp = XsDmaControlRegsP->DCSR[channel] & 0x08;
		Util_DelayUs(1);
	}
	PrintfUartDef("     Channel vacant\r\n");
	XsDmaControlRegsP->DCSR[channel] = 0x00000008;
	XsDmaControlRegsP->DDG[channel].DDADR = ((UINT32)pdesc);// | 0xA0000001;
	XsDmaControlRegsP->DRCMR[XSDMA_DRCMR_ID_AC97_AUDIO_TX] = channel | 0x080u;
	
	XsAc97CtrlRegsP->POSR |= 0x00000010;
	
	PrintfUartDef("     To start dma\r\n");
	startdma(channel);
	
	PrintfUartDef("Exit playpcm\r\n");
	return;
	while (1);
	
	// The below code is for debug
restart:
	XsAc97CtrlRegsP->POSR |= 0x00000010;
	tmp = XsDmaControlRegsP->DCSR[channel];
	tmp = XsDmaControlRegsP->DCSR[channel] & 0x08;
	if (tmp)
	{
		startdma(channel);
		while (XsDmaControlRegsP->DCSR[channel] & 0x08)
		{
			DDADR = XsDmaControlRegsP->DDG[channel].DDADR;
			DSADR = XsDmaControlRegsP->DDG[channel].DSADR;
			DTADR = XsDmaControlRegsP->DDG[channel].DTADR;
			DCMD = XsDmaControlRegsP->DDG[channel].DCMD;
			PrintfUartDef("dma not run\n\t[DDADR]0x%x\n\t[DSADR]0x%x\n\t[DTADR]0x%x\n\t[DCMD]0x%x\n", DDADR, DSADR, DTADR, DCMD);
		}
	}
	
	Util_DelayUs(1);
	if (XsDmaControlRegsP->DCSR[channel] & 0x08)
	{
		DDADR = XsDmaControlRegsP->DDG[channel].DDADR;
		PrintfUartDef("dma stops: [DDADR]0x%x\n", DDADR);
	}
	if (XsAc97CtrlRegsP->POSR & 0x00000010)
	{
		//XsDmaControlRegsP->DCSR[channel] &= 0x7FFFFFFF;	// RUN = 0
		//while (!(XsDmaControlRegsP->DCSR[channel] & 0x08))	DM_WaitUs(1);
		DDADR = XsDmaControlRegsP->DDG[channel].DDADR;
		DSADR = XsDmaControlRegsP->DDG[channel].DSADR;
		DTADR = XsDmaControlRegsP->DDG[channel].DTADR;
		DCMD = XsDmaControlRegsP->DDG[channel].DCMD;
		tmp = XsDmaControlRegsP->DCSR[channel];
		PrintfUartDef("fifo error:\n\t[DDADR]0x%x\n\t[DSADR]0x%x\n\t[DTADR]0x%x\n\t[DCMD]0x%x\n", DDADR, DSADR, DTADR, DCMD);
	}goto restart;}