Part Number: TMS320C5545
Tool/software: TI C/C++ Compiler
Hi,
I'm trying to record the headphone output of the booster pack on PC/ mobile using aux cable and it records power noise hum along with audio. but i don't hear that noise when i hear the output on my headphone. is it due to dc voltage or common mode issue. how to resolve it? please see the code with codec settings and suggest me to resolve the issue
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/*! \file audio_line_in_loopback_test.c
*
* \brief Functions that configure the audio codec regsiters for the audio
* line in loopback operation.
*
*/
#include "audio_line_in_loopback_test.h"
#include "audio_common.h"
#include "../../../build/boostC5545/audio_line_in_loopback_test/coeff"
#include <math.h>
extern TEST_STATUS AIC3206_loop_linein(void *testArgs);
/**
*
* \brief This function configures all audio codec registers for
* line in loopback test
*
* \param testArgs [IN] Test arguments
*
* \return
* \n TEST_PASS - Test Passed
* \n TEST_FAIL - Test Failed
*
*/
TEST_STATUS AIC3206_loop_linein(void *testArgs)
{
Int16 sec, msec;
Int16 sample;
Int16 data1, data2;
Int16 output1,output2;
/* Configure AIC3206 */
AIC3206_write( 0, 0x00 ); // Select page 0
AIC3206_write( 1, 0x01 ); // Reset codec
C55x_delay_msec(1); // Wait 1ms after reset
AIC3206_write( 0, 0x01 ); // Select page 1
AIC3206_write( 1, 0x08 ); // Disable crude AVDD generation from DVDD
AIC3206_write( 2, 0x01 ); // Enable Analog Blocks, use LDO power
AIC3206_write( 123,0x05 ); // Force reference to power up in 40ms
C55x_delay_msec(40); // Wait at least 40ms
AIC3206_write( 0, 0x00 ); // Select page 0
/* PLL and Clocks config and Power Up */
AIC3206_write( 27, 0x0d ); // BCLK and WCLK are set as o/p; AIC3206(Master)
AIC3206_write( 28, 0x00 ); // Data ofset = 0
AIC3206_write( 4, 0x03 ); // PLL setting: PLLCLK <- MCLK, CODEC_CLKIN <-PLL CLK
AIC3206_write( 6, 0x07 ); // PLL setting: J=7
AIC3206_write( 7, 0x06 ); // PLL setting: HI_BYTE(D=1680)
AIC3206_write( 8, 0x90 ); // PLL setting: LO_BYTE(D=1680)
AIC3206_write( 30, 0x88 ); // For 32 bit clocks per frame in Master mode ONLY
// BCLK=DAC_CLK/N =(12288000/8) = 1.536MHz = 32*fs
AIC3206_write( 5, 0x91 ); // PLL setting: Power up PLL, P=1 and R=1
C55x_delay_msec(1); // Wait for PLL to come up
AIC3206_write( 13, 0x00 ); // Hi_Byte(DOSR) for DOSR = 128 decimal or 0x0080 DAC oversamppling
AIC3206_write( 14, 0x80 ); // Lo_Byte(DOSR) for DOSR = 128 decimal or 0x0080
AIC3206_write( 20, 0x80 ); // AOSR for AOSR = 128 decimal or 0x0080 for decimation filters 1 to 6
AIC3206_write( 11, 0x87 ); // Power up NDAC and set NDAC value to 7
AIC3206_write( 12, 0x8C ); // Power up MDAC and set MDAC value to 12
AIC3206_write( 18, 0x87 ); // Power up NADC and set NADC value to 7
AIC3206_write( 19, 0x8C ); // Power up MADC and set MADC value to 12
/* DAC ROUTING and Power Up */
AIC3206_write( 0, 0x01 ); // Select page 1
AIC3206_write( 12, 0x08 ); // LDAC AFIR routed to HPL
AIC3206_write( 13, 0x08 ); // RDAC AFIR routed to HPR
AIC3206_write( 0, 0x00 ); // Select page 0
AIC3206_write( 64, 0x02 ); // Left vol=right vol
AIC3206_write( 65, 0x20 ); // Left DAC gain to 0dB VOL; Right tracks Left
AIC3206_write( 63, 0xd4 ); // Power up left,right data paths and set channel
AIC3206_write( 0, 0x01 ); // Select page 1
AIC3206_write( 16, 0x00 ); // Unmute HPL , 0dB gain
AIC3206_write( 17, 0x00 ); // Unmute HPR , 0dB gain
AIC3206_write( 9 , 0x30 ); // Power up HPL,HPR
C55x_delay_msec(1 ); // Wait 1 msec
/* ADC ROUTING and Power Up */
AIC3206_write( 0, 0x01 ); // Select page 1
AIC3206_write( 52, 0x40 ); // STEREO 1 Jack
// IN2_L to LADC_P through 40 kohm
AIC3206_write( 55, 0x40 ); // IN2_R to RADC_P through 40 kohmm
AIC3206_write( 54, 0x03 ); // CM_1 (common mode) to LADC_M through 40 kohm
AIC3206_write( 57, 0x03 ); // CM_1 (common mode) to RADC_M through 40 kohm
AIC3206_write( 59, 0x20 ); // MIC_PGA_L unmute
AIC3206_write( 60, 0x20 ); // MIC_PGA_R unmute
AIC3206_write( 51, 0x00 ); // SetMICBIAS
AIC3206_write( 0, 0x00 ); // Select page 0
AIC3206_write( 81, 0xc0 ); // Powerup Left and Right ADC
AIC3206_write( 82, 0x00 ); // Unmute Left and Right ADc
AIC3206_write( 83, 0x00 ); // Unmute Left and Right ADC
AIC3206_write( 84, 0x00 ); // Unmute Left and Right ADC
//AIC3206_write( 86, 0x80 ); // L-AGC configuration
//AIC3206_write( 94, 0x80 ); // R-AGC configuration
C55x_delay_msec(1 ); // Wait 1 msec
/* Initialize I2S */
initialise_i2s_interface();
gpio_interrupt_initiliastion();
/*Circular Buffer FIR Implementation*/
Int16 coeff1[135];
int N=135;
int i,n;
int index1=0;
int index2=N;
Int16 x[2*135];
Int16 z[2*135];
long y1new,y2new;
int k=0;
I2S_writeLeft(0);
I2S_writeRight(0);
/*for(n=0;n<N;n++){
coeff1[n]=round(coeff[n]*32);
}*/
for ( sec = 0 ; sec < 600 ; sec++ )
{
for ( msec = 0 ; msec < 1000 ; msec++ )
{
for ( sample = 0 ; sample < 8 ; sample++ )
{
// Read 16-bit left channel Data
I2S_readLeft(&data1);
// Read 16-bit right channel Data
I2S_readRight(&data2);
// As a new sample is received put it in two places
x[index1] = data1;
x[index2] = data1;
z[index1] = data2;
z[index2] = data2;
y1new=0;
y2new=0;
for(i=0;i<N;i++){
y1new = y1new + (long)coeff[i]*x[index2-i];
y2new = y2new + (long)coeff[i]*z[index2-i];
}
index1 = (index1+1)%N;
index2 = index1+N;
output1=y1new>>15;
output2=y2new>>15;
// Write 16-bit left channel Data
I2S_writeLeft(output1);
// Write 16-bit right channel Data
I2S_writeRight(output2);
}
if(sw3Pressed == TRUE)
{
break;
}
}
if(sw3Pressed == TRUE)
{
break;
}
}
/* Play Loop for 5 seconds */
/* for ( sec = 0 ; sec < 500 ; sec++ )
{
for ( msec = 0 ; msec < 1000 ; msec++ )
{
for ( sample = 0 ; sample < 16 ; sample++ )
{
Read 16-bit left channel Data
I2S_readLeft(&data1);
Read 16-bit right channel Data
I2S_readRight(&data2);
Write 16-bit left channel Data
I2S_writeLeft(data1);
Write 16-bit right channel Data
I2S_writeRight(data2);
}
if(sw3Pressed == TRUE)
{
break;
}
}
if(sw3Pressed == TRUE)
{
break;
}
}*/
I2S_close(hI2s); // Disble I2S
AIC3206_write( 1, 0x01 ); // Reset codec
return 0;
}
/**
*
* \brief This function used to initialise i2c interface and run
* audio line in loopback test
*
* \param testArgs [IN] Test arguments
*
* \return
* \n TEST_PASS - Test Passed
* \n TEST_FAIL - Test Failed
*
*/
static TEST_STATUS run_audio_line_in_loopback_test(void *testArgs)
{
Int16 retVal;
Uint8 c = 0;
/* Enable clocks to all peripherals */
CSL_SYSCTRL_REGS->PCGCR1 = 0x0000;
CSL_SYSCTRL_REGS->PCGCR2 = 0x0000;
retVal = SYS_setEBSR(CSL_EBSR_FIELD_PPMODE,
CSL_EBSR_PPMODE_1); // Configure Parallel Port for I2S2
retVal |= SYS_setEBSR(CSL_EBSR_FIELD_SP1MODE,
CSL_EBSR_SP1MODE_1); // Serial Port mode 1 (I2S1 and GP[11:10]).
retVal = initialise_i2c_interface(testArgs);
if(retVal != 0)
{
C55x_msgWrite("I2C initialisation failed\n\r");
return (TEST_FAIL);
}
C55x_msgWrite( "Test Receives audio samples from LINE IN and output the same\n\r"
"on HEADPHONE port\n\n\r");
C55x_msgWrite("Connect headset to the HEADPHONE port of the BoosterPack\n\n\r");
C55x_msgWrite("Connect a LINE-IN cable between the audio port of the\n\r"
"Test PC and LINE IN of the BoosterPack\n\n\r");
C55x_msgWrite("Play any audio file from the Test PC and Check \n\r"
"Audio from the headset connected to BoosterPack\n\n\r");
retVal = AIC3206_loop_linein(testArgs);
if(retVal != 0)
{
return (TEST_FAIL);
}
#ifdef USE_USER_INPUT
C55x_msgWrite("Press Y/y if the Audio stream from LINE IN is\n\r"
"observed at the headset connected to HEADPHONE port,\n\r"
"any other key for failure:\n\r");
C55x_msgRead(&c, 1);
if((c != 'y') && (c != 'Y'))
{
C55x_msgWrite("Audio Loopback from LINE IN to the HEADPHONE port\n\r"
"is not proper\n\r");
return (TEST_FAIL);
}
#endif
return (TEST_PASS);
}
/**
*
* \brief This function performs audio line in loopback test
*
* \param testArgs [IN] Test arguments
*
* \return
* \n TEST_PASS - Test Passed
* \n TEST_FAIL - Test Failed
*
*/
TEST_STATUS audioLineInLoopbackTest(void *testArgs)
{
TEST_STATUS testStatus;
C55x_msgWrite("\n*******************************************\n\r");
C55x_msgWrite( " AUDIO LINE IN LOOPBACK TEST \n\r");
C55x_msgWrite( "*******************************************\n\r");
testStatus = run_audio_line_in_loopback_test(testArgs);
if(testStatus != TEST_PASS)
{
C55x_msgWrite("\nAudio LINE IN Loopback Test Failed!\n\r");
return (TEST_FAIL);
}
else
{
C55x_msgWrite("\nAudio LINE IN Loopback Test Passed!\n\r");
}
C55x_msgWrite("\nAudio LINE IN Loopback Test Completed!!\n\r");
return testStatus;
}
