sta013.c

MP3播放程序

u8 sta_ReadReg(u8 reg)
{
	u8 data;
	
	sta_ReadDevice(STA_I2C_DEV, reg, 1, &data);
	return data;
}
//写寄存器
void sta_WriteReg(u8 reg, u8 data)
{
	i2cSend(STA_I2C_DEV, reg, 1, &data);
}
//写配置文件
void sta_DownloadUpdate(void)
{
	u16 i;
	u8 reg, data;

	i=0;

	reg = PRG_RDB(STA013_UpdateData + i++);
	data = PRG_RDB(STA013_UpdateData + i++);
	//结束标志"0xFF"
	while( (reg != 0xff) )
	{
		sta_WriteReg(reg, data);
		reg = PRG_RDB(STA013_UpdateData + i++);
		data = PRG_RDB(STA013_UpdateData + i++);
	}
}
//设置音调
void sta_SetTone(s8 bassEnh, u16 bassFreq, s8 trebleEnh, u16 trebleFreq)
{
	//设置低音增益
	sta_WriteReg(STA_REG_BASS_FREQUENCY_LOW,  (bassFreq   ) & 0xFF );
	sta_WriteReg(STA_REG_BASS_FREQUENCY_HIGH, (bassFreq>>8) & 0xFF );
	//注意界限
	bassEnh = MIN(bassEnh,MAX_BASS_ENHANCE);
	bassEnh = MAX(bassEnh,MIN_BASS_ENHANCE);
	sta_WriteReg(STA_REG_BASS_ENHANCE, bassEnh);

	//设置高音增益
	sta_WriteReg(STA_REG_TREBLE_FREQUENCY_LOW,  (trebleFreq   ) & 0xFF );
	sta_WriteReg(STA_REG_TREBLE_FREQUENCY_HIGH, (trebleFreq>>8) & 0xFF );
	//注意界限
	trebleEnh = MIN(trebleEnh,MAX_TREBLE_ENHANCE);
	trebleEnh = MAX(trebleEnh,MIN_TREBLE_ENHANCE);
	sta_WriteReg(STA_REG_TREBLE_ENHANCE, trebleEnh);

	//
	sta_WriteReg( STA_REG_TONE_ATTEN, MAX(bassEnh,trebleEnh) );
}
//配置STA013并开始解压
void sta_StartDecoder(void)
{
	//软件复位
	sta_WriteReg(STA_REG_SOFT_RESET,		0x01);
	sta_WriteReg(STA_REG_SOFT_RESET,		0x00);

	//静音与配置DAC输出
	sta_WriteReg(STA_REG_MUTE,				0x01);
	sta_WriteReg(STA_REG_PCMDIVIDER,		0x01);	// 32-bit mode, O_FAC = 256
	sta_WriteReg(STA_REG_PCMCONF,			0x31);	// 18-bit mode & more

	//配置PLL
	sta_WriteReg(STA_REG_PLLFRAC_441_H,		0x67);
	sta_WriteReg(STA_REG_PLLFRAC_441_L,		0x77);
	sta_WriteReg(STA_REG_PLLFRAC_H,			0xbb);
	sta_WriteReg(STA_REG_PLLFRAC_L,			0x3a);
	sta_WriteReg(STA_REG_MFSDF_441,			0x10);
	sta_WriteReg(STA_REG_MFSDF,				0x0F);

	//配置界面等
	sta_WriteReg(STA_REG_PLLCTL_2,			0x0C);
	sta_WriteReg(STA_REG_PLLCTL_3,			0x00);
	sta_WriteReg(STA_REG_PLLCTL_1,			0xA1);
	sta_WriteReg(STA_REG_SCLK_POL,			0x00);	// data sampled on rising edge
	sta_WriteReg(STA_REG_REQ_POL,			0x01);	// REQ line active high
	sta_WriteReg(STA_REG_DATA_REQ_ENABLE,	0x04);
	sta_WriteReg(STA_REG_PLLCTL_1,			0xA1);

	//设置音调
	sta_SetTone(0, 0, 0, 0);

	//STA013开始运行
	sta_WriteReg(STA_REG_RUN,  0x01);
	sta_WriteReg(STA_REG_PLAY, 0x01);
	sta_WriteReg(STA_REG_MUTE, 0x00);
}
//STA013初始化
u8 sta_Init(void)
{
	//复位
	sta_Reset();

	//识别STA013
	if(sta_ReadReg(STA_REG_IDENT) != STA_IDENT)
	{
		return FALSE;
	}

	//配置STA013
	sta_DownloadUpdate();
	//开始解压
	sta_StartDecoder();
	
	return TRUE;
}
//停止解压
void sta_StopDecoder(void)
{
	//静音
	sta_WriteReg(STA_REG_MUTE, 0x01);
	//软件复位
	sta_WriteReg(STA_REG_SOFT_RESET, 0x01);
	sta_WriteReg(STA_REG_SOFT_RESET, 0x00);
}
//暂停解压
void sta_PauseDecoder(void)
{
	//静音
	sta_WriteReg(STA_REG_MUTE, 0x01);
	//停止
	sta_WriteReg(STA_REG_PLAY, 0x00);
}
//恢复解压
void sta_ResumeDecoder(void)
{
	//开始解压
	sta_WriteReg(STA_REG_PLAY, 0x01);
	//放音
	sta_WriteReg(STA_REG_MUTE, 0x00);
}
//获取MP3信息
void sta_GetMP3Info(u16 *bitrate, u8 *sampFreq, u8 *mode)
{
	u8 headL, headM, headH;
	u8 mpegID, bitrateIndex, sampFreqIndex;
	
	// get the MP3 header info
	headH = sta_ReadReg(STA_REG_HEAD_H);
	headM = sta_ReadReg(STA_REG_HEAD_M);
	headL = sta_ReadReg(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)sta_ReadReg(STA_REG_HEAD_H) << 16 |
       (unsigned long)sta_ReadReg(STA_REG_HEAD_M) << 8  |
       (unsigned long)sta_ReadReg(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 sta_GetAverageBitrate(void)
{
	return (2 * sta_ReadReg(STA_REG_AVERAGE_BITRATE));
}

void sta_SetVolume(u8 volume, s8 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
	sta_WriteReg(STA_REG_DLA, attenL);
	sta_WriteReg(STA_REG_DLB, MAX_VOLUME_ATTENUATION);
	sta_WriteReg(STA_REG_DRA, attenR);
	sta_WriteReg(STA_REG_DRB, MAX_VOLUME_ATTENUATION);
}
//检测STA013的REQ
u8 sta_Demand(void)
{
	return bit_is_set(STA_REQ_IN, STA_REQ);
}
//发送MP3数据到STA013
void sta_SendToDecoder(u16 len)
{
	u16 pt = 0;
	s8 j;
	u8 done = 1;
	u8 mdata;
	
	while(done) 
	{
	  while(sta_Demand())
	  {
	  	mdata = PRG_RDB(mp3_data + pt);
	     //用软串口传送
//	     for(j = 7; j >= 0; j--)
//	     {
//	       cbi(STA_SCK_OUT, STA_SCK);
//	       if((mdata >> j) & 1) sbi(STA_SDI_OUT, STA_SDI);
//	       else cbi(STA_SDI_OUT, STA_SDI);
//	       sbi(STA_SCK_OUT, STA_SCK);
//	     }
		//用SPI传送
	    spiSendByte(mdata);
		pt++;
		len--;
		if(len == 0)
		{
	     	done = 0;
	     	break;
		}
	  }
	}

}