how to read 32 bit data from TMS320C6713 from mic in ?

Hi,

Thanks for your post.

As per my knowledge, the McBSP receiver in c6713 is configured to input 24 bits of data and the FSX/CLKX appear to be programmed to output 12 bits of data for a word and so, we need to check the feasibility of reading 32 bit data from mic. and divide it into two 16-bit data , but still, we need to ensure if we can program the configuration accordingly to support receiver input of 32-bit data and FSX/CLKX to transfer 32 bit via McBSP.

You must set XDATDLY=RDATDLY=1.  You must also set FSGM=0.  These requirements are stated in Section 9.1 of the McBSP Reference Guide.  Please review the information carefully.

http://www.ti.com/lit/ug/spru580g/spru580g.pdf

Thanks & regards,

Sivaraj K

----------------------------------------------------------------------------------------------------------------

Please click the "Verify Answer" button on this post if it answers your question.

----------------------------------------------------------------------------------------------------------------

hello Sivaraj

Thank you for your reply , code used is described below . I tried to change the Mcbsp configuration and now the program can't go beyond "while(!DSK6713_AIC23_read(hCodec, &IN_L));" unable to read i guess.  

#define CHIP_6713

#include <stdio.h>
#include <c6x.h>
#include <csl.h>
#include <csl_mcbsp.h>
#include <csl_irq.h>

#include "dsk6713.h"
#include "dsk6713_aic23.h"

DSK6713_AIC23_CodecHandle hCodec;

// Codec configuration settings
DSK6713_AIC23_Config config = { \
0x0017, /* 0 DSK6713_AIC23_LEFTINVOL Left line input channel volume */ \
0x0017, /* 1 DSK6713_AIC23_RIGHTINVOL Right line input channel volume */\
0x00d8, /* 2 DSK6713_AIC23_LEFTHPVOL Left channel headphone volume */ \
0x00d8, /* 3 DSK6713_AIC23_RIGHTHPVOL Right channel headphone volume */ \
0x0010, /* 4 DSK6713_AIC23_ANAPATH Analog audio path control */ \
0x0000, /* 5 DSK6713_AIC23_DIGPATH Digital audio path control */ \
0x0000, /* 6 DSK6713_AIC23_POWERDOWN Power down control */ \
0x0043, /* 7 DSK6713_AIC23_DIGIF Digital audio interface format */ \
0x0081, /* 8 DSK6713_AIC23_SAMPLERATE Sample rate control */ \
0x0001 /* 9 DSK6713_AIC23_DIGACT Digital interface activation */ \
};

MCBSP_Config mcbspConfig = { 0x00010000, // SPCR is set for transmitting
0x000100A0, // 1-phase 32bit word for RCR
0x000100A0, // 1-phase 32bit word for XCR
0x00000000, // SRGR (Sample rate generator register FSGM)
0x00000000,
0x00000000,
0x00000000,
0x00000000,
};
// Int16 buf[1024];
// Uint32 i=0;
//interrupt void serialPortRcvISR(void);
//void hook_int();
//int volumeGain;

void main()
{
DSK6713_AIC23_CodecHandle hCodec;
Int16 OUT_L, OUT_R;
Uint32 IN_L;//var2=0XFFFF0000;
short a;
float d_n=0.0;
// Int16 var1=0xFFFF;
// Int16 ans1,ans2;
// Initialize BSL
//int i=0;

//intr_reset();
DSK6713_init();

//Start codec
hCodec = DSK6713_AIC23_openCodec(0, &config);

/*
MCBSP_FSETS(SPCR2, RINTM, FRM);
MCBSP_FSETS(SPCR2, XINTM, FRM);
MCBSP_FSETS(RCR2, RWLEN1, 32BIT);
MCBSP_FSETS(XCR2, XWDLEN1, 32BIT);
*/
// Set frequency to 16KHz
DSK6713_AIC23_setFreq(hCodec,DSK6713_AIC23_FREQ_8KHZ);
extern far MCBSP_Handle DSK6713_AIC23_DATAHANDLE;
MCBSP_config( DSK6713_AIC23_DATAHANDLE, &mcbspConfig );
MCBSP_start( DSK6713_AIC23_DATAHANDLE, MCBSP_XMIT_START |
MCBSP_SRGR_START | MCBSP_SRGR_FRAMESYNC , 220 );
for(;;)
{
// Read sample from the left channel

while(!DSK6713_AIC23_read(hCodec, &IN_L));

a=IN_L;

d_n = (double)((double)(a)/(32768.0)); // 2^14

OUT_L = (Int16)(d_n*32768.0); //2^15;
OUT_R = (Int16)(d_n*32768.0); //2^15;
//OUT_L = IN_L;
//OUT_R = IN_L;

// Send sample, first left next right channel
while (!DSK6713_AIC23_write(hCodec, IN_L));
while (!DSK6713_AIC23_write(hCodec, OUT_R));

}
DSK6713_AIC23_closeCodec(hCodec); // Codec close is unreachable

}

Nageshwar

RandyP

Thanks I tried my program with two calls for DSK6713_AIC23_read now its almost perfect . If I am giving a stereo audio data input to line in (left channel with random data and right channel with zeros or no data) .

The output while observing in CCSv5.5 has almost perfect left channel and a little residual data in right channel.(there is a lot of difference in there amplitudes but right channel not zero).

I guess there might be a problem in data read as the data read is more than 16 bits per DSK6713_AIC23_read ( in the 2nd post Sivaraj K said its reading default 24 bits per read). Is there a simple solution to read 16 bits ..?

thanks again for the help i am stuck at this point for days now...

Nageshwar