post_common.c

对ADSP21369的原理图和测试程序进行搜集

//
//          Connect DAC1 to SPORT1, using data output A
//          Connect DAC2 to SPORT1, using data output B
//          Connect DAC3 to SPORT2, using data output A
//          Connect DAC4 to SPORT2, using data output B
//
//          Connect the clock and frame sync inputs to SPORT1 and SPORT2
//          should come from the ADC on DAI pins 7 and 8, respectively
//
//          Connect the ADC BCLK and LRCLK back out to the DAC on DAI
//          pins 13 and 14, respectively.
//
//          All six DAC connections are always outputs from the SHARC
//          so tie the pin buffer enable inputs all high.
//

//------------------------------------------------------------------------
//  Connect the pin buffers to the SPORT data lines and ADC BCLK & LRCLK

    SRU(SPORT2_DB_O,DAI_PB09_I);
    SRU(SPORT2_DA_O,DAI_PB10_I);
    SRU(SPORT1_DB_O,DAI_PB11_I);
    SRU(SPORT1_DA_O,DAI_PB12_I);

//------------------------------------------------------------------------
//  Connect the clock and frame sync input from the ADC directly
//    to the output pins driving the DACs.

    SRU(DAI_PB07_O,DAI_PB13_I);
    SRU(DAI_PB08_O,DAI_PB14_I);
    //SRU(DAI_PB17_O,DAI_PB06_I); // comment out for external pll

//------------------------------------------------------------------------
//  Connect the SPORT clocks and frame syncs to the clock and
//    frame sync from the SPDIF receiver

    SRU(DAI_PB07_O,SPORT1_CLK_I);
    SRU(DAI_PB07_O,SPORT2_CLK_I);
    SRU(DAI_PB08_O,SPORT1_FS_I);
    SRU(DAI_PB08_O,SPORT2_FS_I);

//------------------------------------------------------------------------
//  Tie the pin buffer enable inputs HIGH to make DAI pins 9-14 outputs.
    SRU(HIGH,PBEN06_I);
    SRU(HIGH,PBEN09_I);
    SRU(HIGH,PBEN10_I);
    SRU(HIGH,PBEN11_I);
    SRU(HIGH,PBEN12_I);
    SRU(HIGH,PBEN13_I);
    SRU(HIGH,PBEN14_I);
}


void Config_SRU_UART(void)
{
	// connect the pin buffer output signal to the UART0 receive
	SRU2(DPI_PB10_O,UART0_RX_I);
	SRU2(LOW,DPI_PB10_I);
	SRU2(LOW,DPI_PBEN10_I)

	// UART transmit signal is connected to DPI pin 9
	SRU2(UART0_TX_O,DPI_PB09_I);
	SRU2(HIGH,DPI_PBEN09_I);
}


void Config_SRU_AT25F2048(void)
{
	SRU(SPI_CLK_O,DPI_PB03_I);
	SRU(HIGH,DPI_PBEN03_I);

	// for the flag pins to act as chip select
	SRU(FLAG4_O, DPI_PB05_I);
	SRU(HIGH, DPI_PBEN05_I);
}

void Config_SRU_INTS(void)
{
	//Pin Assignments in SRU_PIN3 (Group D)
    SRU(LOW,DAI_PB19_I);//assign pin buffer 19 low so it is an input
    SRU(LOW,DAI_PB20_I);    //assign pin buffer 20 low so it is an input

    //Route MISCA singnals in SRU_EXT_MISCA (Group E)
    SRU(DAI_PB19_O,MISCA1_I);//route so that DAI pin buffer 19 connects to MISCA1
    SRU(DAI_PB20_O,MISCA2_I);//route so that DAI pin buffer 20 connects to MISCA2

    //Pin Buffer Disable in SRU_PINEN0 (Group F)
    SRU(LOW,PBEN19_I);//assign pin 19 low so it is an input
    SRU(LOW,PBEN20_I);//assign pin 20 low so it is an input
}



void Config_SRU_LEDS(void)
{
//Setting the SRU and route so that Flag pins connects to DPI pin buffers.
//Use Flags 4 to 15 only. Flags 0 to 3 are reserved
	SRU(FLAG4_O,DPI_PB06_I);	//DPI => We can use flags.
	SRU(FLAG5_O,DPI_PB07_I);	//DPI => We can use flags.
	SRU(FLAG6_O,DPI_PB08_I);	//DPI => We can use flags.
	SRU(FLAG7_O,DPI_PB13_I);	//DPI => We can use flags.
	SRU(FLAG8_O,DPI_PB14_I);	//DPI => We can use flags.
	SRU(LOW,DAI_PB15_I);		//DAI => We can't use flags. Value has to be set low or high.
	SRU(LOW,DAI_PB16_I);		//DAI => We can't use flags. Value has to be set low or high.

//Enabling the Buffer using the following sequence: High -> Output, Low -> Input
	SRU(HIGH,DPI_PBEN06_I);
	SRU(HIGH,DPI_PBEN07_I);
	SRU(HIGH,DPI_PBEN08_I);
	SRU(HIGH,DPI_PBEN13_I);
	SRU(HIGH,DPI_PBEN14_I);
	SRU(HIGH,PBEN15_I);		//default format to enable the buffer using DAI
	SRU(HIGH,PBEN16_I);
}

void Config_SRU_SPDIF(void)
{
    // Disable the pull-up resistors on all 20 pins
    *pDAI_PIN_PULLUP = 0x000FFFFF;

//------------------------------------------------------------------------
//  Connect the SPDIF Receiver
    SRU(DAI_PB18_O, DIR_I);

//------------------------------------------------------------------------
//  Connect the SPDIF Receiver outputs.

    SRU(DIR_DAT_O, SPORT0_DA_I);
    SRU(DIR_FS_O, SPORT0_FS_I);
    SRU(DIR_CLK_O, SPORT0_CLK_I);

//------------------------------------------------------------------------
//  Connect the SPDIF Transmitter Inputs

    SRU(SPORT3_DA_O, DIT_DAT_I);
    SRU(DIR_FS_O, DIT_FS_I);
    SRU(DIR_CLK_O, DIT_CLK_I);
    SRU(DIR_CLK_O, SPORT3_CLK_I);


    SRU(DIR_FS_O, SPORT3_FS_I );


    SRU(DIR_TDMCLK_O, DIT_HFCLK_I); // also used in external pll code

    //SRU(DIR_TDMCLK_O,DAI_PB03_I);
    //SRU(DAI_PB02_O,DIT_HFCLK_I);
    //SRU(HIGH,PBEN03_I);
	//SRU(LOW,PBEN02_I);



//------------------------------------------------------------------------
//  Connect the SPDIF Transmitter Output.
    SRU(DIT_O, DAI_PB01_I);

//------------------------------------------------------------------------
//  Tie the pin buffer inputs LOW for DAI pin 18.  Even though
//    these pins are inputs to the SHARC, tying unused pin buffer inputs
//    LOW is "good coding style" to eliminate the possibility of
//    termination artifacts internal to the IC.  Note that signal
//    integrity is degraded only with a few specific SRU combinations.
//    In practice, this occurs VERY rarely, and these connections are
//    typically unnecessary.

    SRU(LOW, DAI_PB18_I);

//------------------------------------------------------------------------
//  Tie the pin buffer enable inputs LOW for DAI pin 18 so
//    that they are always input pins.

    SRU(LOW, PBEN18_I);

//-----------------------------------------------------------------------------

//------------------------------------------------------------------------
//  Tie the pin buffer enable inputs HIGH to make DAI pin 1 an output.
    SRU(HIGH,PBEN01_I);
}


volatile bool g_bLeftRight = 1;
volatile int  g_iSampleIndex = 1;
volatile int  g_iSampleCount = 0;

volatile float g_fSineWaveOut[MAX_SAMPLES];
volatile float g_fSineWaveIn_Left[MAX_SAMPLES];
volatile float g_fSineWaveIn_Right[MAX_SAMPLES];


int Test_Channel(float* pfRealIn, const int iMaxSamples, const int iSampleRate, const float fExpFreq, const float fFreqTol, const float fExpAmp, const float fAmpTol)
{
	const float fMaxFreq = (fExpFreq + (fExpFreq * fFreqTol));
	const float fMinFreq = (fExpFreq - (fExpFreq * fFreqTol));

	complex_float cfFFTOut[(MAX_SAMPLES/2)];
	float fTempFreq = 0;
	int nSampleNumber = 0;
	int nHighestFreqIndex = 0;
	float fSampledFrequency = 0;
	float fSlope = 0.0;
	int   iSlopeY1 = 0;


   	// Real input array fills from a converter or other source
	rfft256( pfRealIn, (complex_float*)cfFFTOut);

   	// Arrays are filled with FFT data
   	// scan the output array for the highest real value
   	fTempFreq = abs(cfFFTOut[0].re);
 	for (nSampleNumber=1; nSampleNumber < (iMaxSamples / 2); nSampleNumber++)
    {
		if( abs(cfFFTOut[nSampleNumber].re) > fTempFreq )
		{
			fTempFreq = abs(cfFFTOut[nSampleNumber].re);
			nHighestFreqIndex = nSampleNumber;
		}
    }

   // multiply the index of the array of the highest value with the sample rate value
   fSampledFrequency = nHighestFreqIndex * (iSampleRate / iMaxSamples);





   // make sure frequency is within acceptable ranges
   if( (fSampledFrequency < fMaxFreq) && (fSampledFrequency > fMinFreq) )
   {
   		// for now, take the point before, and after the max value
   		// average them, then find the distance between them

	    // the slope is given by b = (y2 - y1) / (x2 - x1) or b = y2-y1
	    if( 0 == nSampleNumber )
	    {	// roll around to the end of the array
	    	iSlopeY1 = iMaxSamples;
	    }
	    else if( iMaxSamples == nSampleNumber )
	    {
	    	iSlopeY1 = 0;
	    }
	    else
	    {
	    	iSlopeY1 = nSampleNumber - 1;
	    }

	    fSlope = (cfFFTOut[nHighestFreqIndex].re - cfFFTOut[iSlopeY1].re);

	    fSlope = abs(fSlope);


	    if( fSlope < fExpAmp )
	    {
	    	return 0;
	    }


	    //fDB = 10 * log10( fSNR );

   		return 1;
   }



	//asm("nop;"); // asm("emuidle;"); //
	return 0;	// test failed
}

void CreateSinTable(const float fAmp, const float fFreq, const float fSampleRate)
{
	int n;

	for(n = 0; n < MAX_SAMPLES; n++)
	{
		g_fSineWaveOut[n] = (float)(fAmp * sin( (2.0 * PI * fFreq * ( ((float)(n+1)) / fSampleRate))) );
	}
}