sta013.c

ATMEL的AVR单片机库文件

	i2cReceive(STA_I2C_DEV, reg, 1, &data);
	return data;
}

void sta013WriteReg(u08 reg, u08 data)
{
	i2cSend(STA_I2C_DEV, reg, 1, &data);
}

void sta013DownloadUpdate(void)
{
	u16 i;
	u08 reg, data;

	i=0;
	// get first reg/data pair
	reg = PRG_RDB(STA013_UpdateData + i++);
	data = PRG_RDB(STA013_UpdateData + i++);
	// loop until end of update
	while( (reg != 0xff) )
	{
		sta013WriteReg(reg, data);
		reg = PRG_RDB(STA013_UpdateData + i++);
		data = PRG_RDB(STA013_UpdateData + i++);
	}
}


u08 sta013Init(void)
{
	// reset STA013 device
	sta013HWReset();

	// identify STA013 device
	if(sta013ReadReg(STA_REG_IDENT) != STA_IDENT)
	{
		return FALSE;
	}

	// do firmware configuration and update
	sta013DownloadUpdate();
	// start decoder
	sta013StartDecoder();
	
	return TRUE;
}


void sta013StartDecoder(void)
{
	// Soft reset
	sta013WriteReg(STA_REG_SOFT_RESET,			0x01);
	sta013WriteReg(STA_REG_SOFT_RESET,			0x00);

	// Mute and configure DAC output
	sta013WriteReg(STA_REG_MUTE,				0x01);
	sta013WriteReg(STA_REG_PCMDIVIDER,			0x01);	// 32-bit mode, O_FAC = 256
	sta013WriteReg(STA_REG_PCMCONF,				0x31);	// 18-bit mode & more

	// Configure PLL for MP3 rates
	sta013WriteReg(STA_REG_PLLFRAC_441_H,		0x67);
	sta013WriteReg(STA_REG_PLLFRAC_441_L,		0x77);
	sta013WriteReg(STA_REG_PLLFRAC_H,			0xbb);
	sta013WriteReg(STA_REG_PLLFRAC_L,			0x3a);
	sta013WriteReg(STA_REG_MFSDF_441,			0x10);
	sta013WriteReg(STA_REG_MFSDF,				0x0F);

	// Configure interface polarities, etc
	sta013WriteReg(STA_REG_PLLCTL_2,			0x0C);
	sta013WriteReg(STA_REG_PLLCTL_3,			0x00);
	sta013WriteReg(STA_REG_PLLCTL_1,			0xA1);
	sta013WriteReg(STA_REG_SCLK_POL,			0x00);	// data sampled on rising edge
	sta013WriteReg(STA_REG_REQ_POL,				0x01);	// REQ line active high
	sta013WriteReg(STA_REG_DATA_REQ_ENABLE,		0x04);
	sta013WriteReg(STA_REG_PLLCTL_1,			0xA1);

	// Set audio tone controls
	sta013SetTone(0, 0, 0, 0);

	// Unmute and start running
	sta013WriteReg(STA_REG_RUN,  0x01);
	sta013WriteReg(STA_REG_PLAY, 0x01);
	sta013WriteReg(STA_REG_MUTE, 0x00);
}


void sta013StopDecoder(void)
{
	// mute output
	sta013WriteReg(STA_REG_MUTE, 0x01);
	// soft reset
	sta013WriteReg(STA_REG_SOFT_RESET, 0x01);
	sta013WriteReg(STA_REG_SOFT_RESET, 0x00);
}


void sta013PauseDecoder(void)
{
	// enable mute
	sta013WriteReg(STA_REG_MUTE, 0x01);
	// stop the decoder
	sta013WriteReg(STA_REG_PLAY, 0x00);
}


void sta013ResumeDecoder(void)
{
	// run the decoder
	sta013WriteReg(STA_REG_PLAY, 0x01);
	// disable mute
	sta013WriteReg(STA_REG_MUTE, 0x00);
}

void sta013GetMP3Info(u16 *bitrate, u08 *sampFreq, u08 *mode)
{
	u08 headL, headM, headH;
	u08 mpegID, bitrateIndex, sampFreqIndex;
	
	// get the MP3 header info
	headH = sta013ReadReg(STA_REG_HEAD_H);
	headM = sta013ReadReg(STA_REG_HEAD_M);
	headL = sta013ReadReg(STA_REG_HEAD_L);

	// IDex:ID is in head[20:19]
	// 00 - MPEG2.5
	// 01 - reserved
	// 10 - MPEG2
	// 11 - MPEG1
	mpegID = (headH & 0x18)>>3;

	// sampling frequency is in head[11:10]
	sampFreqIndex = ((headM & 0x0C)>>2) | (mpegID<<2);

	// bitrate index is in head[15:12]
	bitrateIndex = ((headM & 0xF0)>>4) | ((mpegID & 0x01)<<4);
	//bitrateIndex = ((headM & 0xF0)>>4) | (1<<4);
	
	// mode is in head[7:6]
	// 00 - stereo
	// 01 - joint stereo
	// 10 - dual channel
	// 11 - single channel (mono)
	*mode = (headL & 0xC0)>>6;
	
	*bitrate =	2 * PRG_RDB( MP3_Bitrates + bitrateIndex );
	*sampFreq = PRG_RDB( MP3_SamplingFrequencies + sampFreqIndex );

/*
   header = (unsigned long)sta013ReadReg(STA_REG_HEAD_H) << 16 |
       (unsigned long)sta013ReadReg(STA_REG_HEAD_M) << 8  |
       (unsigned long)sta013ReadReg(STA_REG_HEAD_L);

//   hdr->word           = l;
//   hdr->emphasis       = l & 0x03;
//   hdr->isOriginal     = (l >> 2) & 0x01;
//   hdr->isCopyrighted  = (l >> 3) & 0x01;
//   hdr->modeExtension  = (l >> 4) & 0x03;
//   hdr->mode           = (l >> 6) & 0x03;
//   hdr->private        = (l >> 8) & 0x01;
//   hdr->padding        = (l >> 9) & 0x01;
//   hdr->frequencyIndex = (l >> 10) & 0x03;
//   hdr->bitrateIndex   = (l >> 12) & 0x0f;
//   hdr->protection     = (l >> 16) & 0x01;
//   hdr->layer          = (l >> 17) & 0x03;
//   hdr->ID             = (l >> 19) & 0x01;
//   hdr->ID_ex          = (l >> 20) & 0x01;
*/
}

u16 sta013GetAverageBitrate(void)
{
	return (2 * sta013ReadReg(STA_REG_AVERAGE_BITRATE));
}

void sta013SetVolume(u08 volume, s08 balance)
{
	char attenL, attenR;

	// volume is expected as 0-100 value
	// Note:
	//	#define MIN_VOLUME_ATTENUATION     0
	//	#define MAX_VOLUME_ATTENUATION     96

	if( balance > 0)
	{	// balance to the left, attenuate right
		attenL = (100 - volume);
		attenR = (100 - volume) - (balance);
	}
	else
	{	// balance to the right, attenuate left
		attenL = (100 - volume) + (balance);
		attenR = (100 - volume);
	}
	// respect limits
	attenL = MIN(attenL,MAX_VOLUME_ATTENUATION);
	attenL = MAX(attenL,MIN_VOLUME_ATTENUATION);
	attenR = MIN(attenR,MAX_VOLUME_ATTENUATION);
	attenR = MAX(attenR,MIN_VOLUME_ATTENUATION);

	// set volume
	sta013WriteReg(STA_REG_DLA, attenL);
	sta013WriteReg(STA_REG_DLB, MAX_VOLUME_ATTENUATION);
	sta013WriteReg(STA_REG_DRA, attenR);
	sta013WriteReg(STA_REG_DRB, MAX_VOLUME_ATTENUATION);
}


void sta013SetTone(s08 bassEnh, u16 bassFreq, s08 trebleEnh, u16 trebleFreq)
{
	// set bass enhancement
	sta013WriteReg(STA_REG_BASS_FREQUENCY_LOW,  (bassFreq   ) & 0xFF );
	sta013WriteReg(STA_REG_BASS_FREQUENCY_HIGH, (bassFreq>>8) & 0xFF );
	// respect limits
	bassEnh = MIN(bassEnh,MAX_BASS_ENHANCE);
	bassEnh = MAX(bassEnh,MIN_BASS_ENHANCE);
	sta013WriteReg(STA_REG_BASS_ENHANCE, bassEnh);

	// set treble enhancement
	sta013WriteReg(STA_REG_TREBLE_FREQUENCY_LOW,  (trebleFreq   ) & 0xFF );
	sta013WriteReg(STA_REG_TREBLE_FREQUENCY_HIGH, (trebleFreq>>8) & 0xFF );
	// respect limits
	trebleEnh = MIN(trebleEnh,MAX_TREBLE_ENHANCE);
	trebleEnh = MAX(trebleEnh,MIN_TREBLE_ENHANCE);
	sta013WriteReg(STA_REG_TREBLE_ENHANCE, trebleEnh);

	// set attentuation to avoid clipping
	sta013WriteReg( STA_REG_TONE_ATTEN, MAX(bassEnh,trebleEnh) );
}

u08 sta013Demand(void)
{
	return bit_is_set(STA013_DEMAND_PORTIN,STA013_DEMAND_PIN);
}