aic23.c

基于TMS320VC5509的PCM编码

#include "5509.h"
#include "util.h"


// AIC23 Control Register addresses
#define AIC23_LT_LINE_CTL         0x00  // 0
#define AIC23_RT_LINE_CTL         0x02  // 1
#define AIC23_LT_HP_CTL           0x04  // 2
#define AIC23_RT_HP_CTL           0x06  // 3
#define AIC23_ANALOG_AUDIO_CTL    0x08  // 4
#define AIC23_DIGITAL_AUDIO_CTL   0x0A  // 5
#define AIC23_POWER_DOWN_CTL      0x0C  // 6
#define AIC23_DIGITAL_IF_FORMAT   0x0E  // 7
#define AIC23_SAMPLE_RATE_CTL     0x10  // 8
#define AIC23_DIG_IF_ACTIVATE     0x12  // 9
#define AIC23_RESET_REG           0x1E  // F - Writing 0 to this reg triggers reset

// AIC23 Control Register settings
#define lt_ch_vol_ctrl       0x0017   /* 0  */
#define rt_ch_vol_ctrl       0x0017   /* 1  */
#define lt_ch_headph_ctrl    0x0079   /* 2  */
#define rt_ch_headph_ctrl    0x0079   /* 3  */
#define alog_au_path_ctrl    0x0000   /* 4  */
#define digi_au_path_ctrl    0x0000   /* 5  */
#define pow_mgt_ctrl_ctrl    0x0002   /* 6  */
#define digi_au_intf_ctrl    0x000D   /* 7  */
#define au_FS_TIM_ctrl       0x0000   /* 8 MCLK=12MHz, Sample Rate setting */
#define digi_intf1_ctrl      0x0001   /* 9  */
#define digi_intf2_ctrl      0x00FF   /* 10 */

#define DIGIF_FMT_MS              0x40
#define DIGIF_FMT_LRSWAP          0x20
#define DIGIF_FMT_LRP             0x10
#define DIGIF_FMT_IWL             0x0c
#define DIGIF_FMT_FOR             0x03

#define DIGIF_FMT_IWL_16          0x00
#define DIGIF_FMT_IWL_20          0x04
#define DIGIF_FMT_IWL_24          0x08
#define DIGIF_FMT_IWL_32          0xc0

#define DIGIF_FMT_FOR_MSBRIGHT    0x00
#define DIGIF_FMT_FOR_MSLEFT      0x01
#define DIGIF_FMT_FOR_I2S         0x02
#define DIGIF_FMT_FOR_DSP         0x03

#define POWER_DEV                 0x80
#define POWER_CLK                 0x40
#define POWER_OSC                 0x20
#define POWER_OUT                 0x10
#define POWER_DAC                 0x08
#define POWER_ADC                 0x04
#define POWER_MIC                 0x02
#define POWER_LINE                0x01

#define SRC_CLKOUT                0x80
#define SRC_CLKIN                 0x40
#define SRC_SR                    0x3c
#define SRC_BOSR                  0x02
#define SRC_MO                    0x01

#define SRC_SR_44                 0x20
#define SRC_SR_32                 0x18
#define SRC_SR_8                  0x0c

#define ANAPCTL_STA               0xc0
#define ANAPCTL_STE               0x20
#define ANAPCTL_DAC               0x10
#define ANAPCTL_BYP               0x08
#define ANAPCTL_INSEL             0x04
#define ANAPCTL_MICM              0x02
#define ANAPCTL_MICB              0x01    

#define DIGPCTL_DACM              0x08
#define DIGPCTL_DEEMP             0x06
#define DIGPCTL_ADCHP             0x01
#define DIGPCTL_DEEMP_DIS         0x00
#define DIGPCTL_DEEMP_32          0x02
#define DIGPCTL_DEEMP_44          0x04
#define DIGPCRL_DEEMP_48          0x06

#define DIGIFACT_ACT              0x01

#define LT_HP_CTL_LZC             0x80
#define RT_HP_CTL_RZC             0x80

void AIC23_Write(unsigned short regaddr, unsigned short data)
{
    unsigned char buf[2];
    buf[0] = regaddr;
    buf[1] = data;
    I2C_Write(I2C_AIC23, 2, buf);
}

void McBSP0_InitSlave()
{
    PC55XX_MCSP pMCBSP0 = (PC55XX_MCSP)C55XX_MSP0_ADDR;
    
    // Put the MCBSP in reset
    Write(pMCBSP0 -> spcr1, 0);
    Write(pMCBSP0 -> spcr2, 0);
       
    // Config frame parameters (32 bit, single phase, no delay)
    Write(pMCBSP0 -> xcr1, XWDLEN1_32);
    Write(pMCBSP0 -> xcr2, XPHASE_SINGLE | XDATDLY_0);
    Write(pMCBSP0 -> rcr1, RWDLEN1_32);
    Write(pMCBSP0 -> rcr2, RPHASE_SINGLE | RDATDLY_0);

    // Disable int frame generation and enable slave w/ext frame signals on FSX
    // Frame sync is active high, data clocked on rising edge of clkx
    Write(pMCBSP0 -> pcr, PCR_CLKXP);

    // Bring transmitter and receiver out of reset
    SetMask(pMCBSP0 -> spcr2, SPCR2_XRST);
    SetMask(pMCBSP0 -> spcr1, SPCR1_RRST);    
}

void AIC23_Init()
{
    I2C_Init();
   
    // Reset the AIC23 and turn on all power
    AIC23_Write(AIC23_RESET_REG, 0);
    AIC23_Write(AIC23_POWER_DOWN_CTL, 0);    
    AIC23_Write(AIC23_ANALOG_AUDIO_CTL, ANAPCTL_DAC | ANAPCTL_INSEL);	// 使用麦克风音源
    AIC23_Write(AIC23_DIGITAL_AUDIO_CTL, 0);
    
    // Turn on volume for line inputs
    AIC23_Write(AIC23_LT_LINE_CTL,0x000);
    AIC23_Write(AIC23_RT_LINE_CTL,0x000);

    // Configure the AIC23 for master mode, 44.1KHz stereo, 16 bit samples
    // Use 12MHz USB clock
    AIC23_Write(AIC23_DIGITAL_IF_FORMAT, DIGIF_FMT_MS | DIGIF_FMT_IWL_16 | DIGIF_FMT_FOR_DSP);
    AIC23_Write(AIC23_SAMPLE_RATE_CTL, SRC_SR_8 | SRC_BOSR | SRC_MO);

    // Turn on headphone volume and digital interface
    AIC23_Write(AIC23_LT_HP_CTL, 0x07f);  // 0x79 for speakers
    AIC23_Write(AIC23_RT_HP_CTL, 0x07f);
    AIC23_Write(AIC23_DIG_IF_ACTIVATE, DIGIFACT_ACT);

    // Set McBSP0 to be transmit slave
    McBSP0_InitSlave();
}

void AIC23_Disable()
{
    PC55XX_MCSP pMCBSP0 = (PC55XX_MCSP)C55XX_MSP0_ADDR;
    I2C_Disable();
    
    // Put the MCBSP in reset
    Write(pMCBSP0 -> spcr1, 0);
    Write(pMCBSP0 -> spcr2, 0);
}

#define AUDIODATA 0x0d000
int *pAudio;
unsigned int G711ALawEncode(int nLeft,int nRight);
unsigned char IntToALaw(int nInput);
int ALawToInt(unsigned char nInput);
    
void AIC23_Mixer()
{
    PC55XX_MCSP pMCBSP0 = (PC55XX_MCSP)C55XX_MSP0_ADDR;
    int left, right,bCodec;
    int *pWork,nAudioCount;
    int i;
    unsigned int uWork;
    unsigned char cWork;
    
	bCodec=0;
	pAudio=pWork=(int *)AUDIODATA;
	nAudioCount=0;
    for ( i=0;i<1024;i++,pWork++ ) (*pWork)=0;
    pWork=pAudio;
    while ( 1 )
    {
        while (!ReadMask(pMCBSP0 -> spcr2, SPCR2_XRDY));	// 等待数据传输完成

        left = Read(pMCBSP0 -> ddr1);	// 读入左声道数据
        right = Read(pMCBSP0 -> ddr2);	// 读入右声道数据
        if ( bCodec )
        {
        	uWork=G711ALawEncode(left,right);
        	(*pWork)=uWork;
        	cWork=uWork>>8;
        	left=ALawToInt(cWork);
        	cWork=uWork&0x0ff;
        	right=ALawToInt(cWork);
		}
        Write(pMCBSP0 -> dxr1, left);	
        Write(pMCBSP0 -> dxr2, right);	
        nAudioCount++; pWork++;
        if ( nAudioCount>=1024 )
        {
        	nAudioCount=0;
        	pWork=pAudio;
        }
    }
}

unsigned int G711ALawEncode(int nLeft,int nRight)
{
	unsigned char cL,cR;
	unsigned int uWork;

	cL=IntToALaw(nLeft);
	cR=IntToALaw(nRight);
	uWork=cL; uWork<<=8; uWork|=cR;
	return(uWork);
}
    
unsigned char IntToALaw(int nInput)
{
	int segment;
	unsigned int i, sign,quant;
	unsigned int absol, temp;
	int nOutput;
	unsigned char cOutput;

	temp=absol=abs(nInput);
	sign=(nInput >= 0)?1:0;
	for ( i=0;i<12;i++ )
	{
		nOutput=temp&0x8000;
		if ( nOutput )	break;
		temp<<=1;
	}
	if ( i>=12 )	nOutput=0;
	else
	{
		segment=11-i;
		quant=(absol>>segment)&0x0F;
		segment-=4; 
		if ( segment<=0 )	segment=0;
		else	segment<<=4;
		nOutput=segment+quant;
	}
	if(sign)
		nOutput^=0xD5;
	else
		nOutput^=0x55;
	cOutput=(unsigned char)nOutput;
	return cOutput;
}

int ALawToInt(unsigned char nInput)
{
	int sign, segment;
	int temp, quant,nOutput;
	

	temp=nInput^0xD5;
	sign=(temp&0x80)>>7;
	segment=temp&0x70; segment>>=4; segment+=4;
	quant=temp&0x0F; quant+=0x10;
	if ( segment>0 )	quant<<=segment;
	if ( sign )
		nOutput=-quant;
	else
		nOutput=quant;

	return nOutput;
}