6748 LCDK develpment kit

Nripendra Malhotra

Other Parts Discussed in Thread: OMAP-L138

I downloaded a project from TI site for 138/c6748 dev board.

test_audio.c

//------------------------------------------------------------------------------
// \file test_audio.c
// \brief implementation of C6748 audio test.
//
//-----------------------------------------------------------------------------

#include "stdio.h"
#include "types.h"
#include "evmc6748.h"
#include "evmc6748_mcasp.h"
#include "evmc6748_aic3106.h"
#include "test_audio.h"

//-----------------------------------------------------------------------------
// Private Defines and Macros
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
// Static Variable Declarations
//-----------------------------------------------------------------------------

static int16_t sinetable[48] = {
0x0000, 0x10b4, 0x2120, 0x30fb, 0x3fff, 0x4dea, 0x5a81, 0x658b,
0x6ed8, 0x763f, 0x7ba1, 0x7ee5, 0x7ffd, 0x7ee5, 0x7ba1, 0x76ef,
0x6ed8, 0x658b, 0x5a81, 0x4dea, 0x3fff, 0x30fb, 0x2120, 0x10b4,
0x0000, 0xef4c, 0xdee0, 0xcf06, 0xc002, 0xb216, 0xa57f, 0x9a75,
0x9128, 0x89c1, 0x845f, 0x811b, 0x8002, 0x811b, 0x845f, 0x89c1,
0x9128, 0x9a76, 0xa57f, 0xb216, 0xc002, 0xcf06, 0xdee0, 0xef4c
};

//-----------------------------------------------------------------------------
// Private Function Prototypes
//-----------------------------------------------------------------------------
static uint32_t testAudioLineOut(void);
static uint32_t testAudioLineIn(void);
static void shutdownAudio(void);

//-----------------------------------------------------------------------------
// Public Function Definitions
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
// \brief tests the AIC3106 CODEC
//
// \param none.
//
// \return uint32_t
//-----------------------------------------------------------------------------
uint32_t TEST_audio(void)
{
uint32_t rtn = ERR_NO_ERROR;

printf("--------------------------------------------------------------------\r\n");
printf(" Audio CODEC test\r\n\r\n");

printf("Additional Equipment\r\n");
printf("--------------------\r\n");
printf("- 3.5mm pass through cable\r\n\r\n");
printf("- 3.5mm headphones\r\n\r\n");

printf("Test Description\r\n");
printf("----------------\r\n");
printf("The test will begin by playing a 5 second tone though the line\r\n");
printf("out port. The 3.5mm pass through cable will not be needed for\r\n");
printf("this portion of the test. After playing the tone, audio from the\n\r");
printf("line in port will be played through the line out port for 15 seconds.\r\n");
printf("--------------------------------------------------------------------\r\n\r\n");

//------------------------------------
// initialize the required bsl modules
//------------------------------------
printf("Initialize the Required BSL Modules\r\n");
printf("-----------------------------------\r\n\r\n");

rtn = MCASP_init();
if (rtn != ERR_NO_ERROR)
{
printf("error initializing mcasp!\r\n");
return (rtn);
}

rtn = AIC3106_init();
if (rtn != ERR_NO_ERROR)
{
printf("error initializing aic3106!\r\n");
return (rtn);
}

//-----------------------
// execute line out test.
//-----------------------
printf("\r\nExecute Test\r\n");
printf("------------\r\n\r\n");

printf("--- test audio line out (put on your headphones...) ---\r\n");
rtn = testAudioLineOut();
if (rtn != ERR_NO_ERROR)
{
printf("\tline out test failed\r\n\r\n");
return (rtn);
}
else
{
printf("\tline out test passed\r\n\r\n");
}

//------------------------------------
// initialize the required bsl modules
//------------------------------------
rtn = MCASP_init();
if (rtn != ERR_NO_ERROR)
{
printf("error initializing mcasp!\r\n");
return (rtn);
}

rtn = AIC3106_init();
if (rtn != ERR_NO_ERROR)
{
printf("error initializing aic3106!\r\n");
return (rtn);
}

//-----------------------
// execute line in test.
//-----------------------
printf("--- test audio line in (put on your headphones and plug in source to line in...) ---\r\n");

rtn = testAudioLineIn();
if (rtn != ERR_NO_ERROR)
{
printf("\tline in test failed\r\n\r\n");
return (rtn);
}
else
{
printf("\tline in test passed\r\n\r\n");
}

// kill codec and mcasp.
shutdownAudio();

return (rtn);
}

//-----------------------------------------------------------------------------
// Private Function Definitions
//-----------------------------------------------------------------------------

uint32_t testAudioLineOut(void)
{
uint32_t rtn = ERR_NO_ERROR;
int16_t msec, sec;
int16_t sample;

// enable the audio clocks, verifying each bit is properly set.
SETBIT(MCASP->XGBLCTL, XHCLKRST);
while (!CHKBIT(MCASP->XGBLCTL, XHCLKRST)) {}
SETBIT(MCASP->RGBLCTL, RHCLKRST);
while (!CHKBIT(MCASP->RGBLCTL, RHCLKRST)) {}

SETBIT(MCASP->XGBLCTL, XCLKRST);
while (!CHKBIT(MCASP->XGBLCTL, XCLKRST)) {}
SETBIT(MCASP->RGBLCTL, RCLKRST);
while (!CHKBIT(MCASP->RGBLCTL, RCLKRST)) {}

SETBIT(MCASP->XGBLCTL, XSRCLR);
while (!CHKBIT(MCASP->XGBLCTL, XSRCLR)) {}
SETBIT(MCASP->RGBLCTL, RSRCLR);
while (!CHKBIT(MCASP->RGBLCTL, RSRCLR)) {}

/* Write a 0, so that no underrun occurs after releasing the state machine */
MCASP->XBUF11 = 0;
//MCASP->RBUF12 = 0;

SETBIT(MCASP->XGBLCTL, XSMRST);
while (!CHKBIT(MCASP->XGBLCTL, XSMRST)) {}
SETBIT(MCASP->RGBLCTL, RSMRST);
while (!CHKBIT(MCASP->RGBLCTL, RSMRST)) {}

SETBIT(MCASP->XGBLCTL, XFRST);
while (!CHKBIT(MCASP->XGBLCTL, XFRST)) {}
SETBIT(MCASP->RGBLCTL, RFRST);
while (!CHKBIT(MCASP->RGBLCTL, RFRST)) {}

// wait for transmit ready and send a dummy byte.
while(!CHKBIT(MCASP->SRCTL11, XRDY)) {}
MCASP->XBUF11 = 0;

// transmit beep.
for (sec = 0; sec < 5; sec++)
{
for (msec = 0; msec < 1000; msec++)
{
for (sample = 0; sample < 48; sample++)
{
// wait for xmit ready and send a sample to the left channel.
while (!CHKBIT(MCASP->SRCTL11, XRDY)) {}
MCASP->XBUF11 = (sinetable[sample] << 15) | 0x00000000;

// wait for xmit ready and send a sample to the left channel.
while (!CHKBIT(MCASP->SRCTL11, XRDY)) {}
MCASP->XBUF11 = (sinetable[sample] << 15) | 0x00000000;

}
}
}
return (rtn);
}

uint32_t testAudioLineIn(void)
{
uint32_t rtn = ERR_NO_ERROR;
int16_t msec, sec, sample;
int32_t dat;

SETBIT(MCASP->XGBLCTL, XCLKRST);
while (!CHKBIT(MCASP->XGBLCTL, XCLKRST)) {}
SETBIT(MCASP->RGBLCTL, RCLKRST);
while (!CHKBIT(MCASP->RGBLCTL, RCLKRST)) {}

SETBIT(MCASP->XGBLCTL, XSRCLR);
while (!CHKBIT(MCASP->XGBLCTL, XSRCLR)) {}
SETBIT(MCASP->RGBLCTL, RSRCLR);
while (!CHKBIT(MCASP->RGBLCTL, RSRCLR)) {}

/* Write a 0, so that no underrun occurs after releasing the state machine */
MCASP->XBUF11 = 0;

SETBIT(MCASP->XGBLCTL, XSMRST);
while (!CHKBIT(MCASP->XGBLCTL, XSMRST)) {}
SETBIT(MCASP->RGBLCTL, RSMRST);
while (!CHKBIT(MCASP->RGBLCTL, RSMRST)) {}

SETBIT(MCASP->XGBLCTL, XFRST);
while (!CHKBIT(MCASP->XGBLCTL, XFRST)) {}
SETBIT(MCASP->RGBLCTL, RFRST);
while (!CHKBIT(MCASP->RGBLCTL, RFRST)) {}

// wait for transmit ready and send a dummy byte.
while(!CHKBIT(MCASP->SRCTL11, XRDY)) {}
MCASP->XBUF11 = 0;

// loop audio
for (sec = 0; sec < 15; sec++)
{
for (msec = 0; msec < 1000; msec++)
{
for (sample = 0; sample < 48; sample++)
{
// wait for recv ready and send a sample to the left channel.
while (!CHKBIT(MCASP->SRCTL11, XRDY)) {}
MCASP->XBUF11 = dat;
dat = MCASP->XBUF12;
//dat = MCASP->RBUF11;

// wait for recv ready and send a sample to the right channel.
while (!CHKBIT(MCASP->SRCTL11, XRDY)) {}
MCASP->XBUF11 = dat;
dat = MCASP->XBUF12;
//dat = MCASP->RBUF11;
}
}
}
return (rtn);
}

void shutdownAudio(void)
{
// close codec.
AIC3106_writeRegister(AIC3106_REG_PAGESELECT, 0);
AIC3106_writeRegister(AIC3106_REG_RESET, 0x80);

// close mcasp.
MCASP->SRCTL0 = 0;
MCASP->SRCTL1 = 0;
MCASP->SRCTL2 = 0;
MCASP->SRCTL3 = 0;
MCASP->SRCTL5 = 0;
MCASP->SRCTL11 = 0;
MCASP->SRCTL12 = 0;
MCASP->GBLCTL = 0;
}

main_audio.c

//-----------------------------------------------------------------------------
// \file main.c
// \brief implementation of main() to test bsl drivers.
//
//-----------------------------------------------------------------------------
#include "stdio.h"
#include "types.h"
#include "evmc6748.h"
#include "evmc6748_timer.h"
#include "evmc6748_gpio.h"
#include "evmc6748_i2c.h"

#include "test_audio.h"

//-----------------------------------------------------------------------------
// Private Defines and Macros
//-----------------------------------------------------------------------------
// uncomment this define if running without gel initialization.
// #define NO_GEL (1)

//-----------------------------------------------------------------------------
// Static Variable Declarations
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
// Private Function Prototypes
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
// Public Function Definitions
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
// \brief entry point for bsl test code.
//
// \param none.
//
// \return none.
//-----------------------------------------------------------------------------
int main(void)
{
uint32_t results = 0;

#if NO_GEL
EVMC6748_init();
EVMC6748_initRAM();
#endif

// init the us timer and i2c for all to use.
USTIMER_init();
I2C_init(I2C0, I2C_CLK_400K);

// TEST AUDIO
//-----------
printf("start test\n");
results += TEST_audio();
printf("\r\n\r\n");

if (results != ERR_NO_ERROR)
printf("\r\n\r\n********** C6748 TEST FAILED **********\r\n\r\n");
else
printf("\r\n\r\n********** C6748 TEST PASSED **********\r\n\r\n");
}

PROBLEM:

compiling and linking is without any errors, but when I run the program, I can hear the program initialize the headphones but no output sound. Please help.

over 13 years ago

0 Donald Reay over 13 years ago

Expert 1545 points

Are you using the LCDK (as suggested in thetitle of your post) or the eXperimenter? The example program is for the eXperimenter. The LCDK uses different McASP serializers to access the AIC3106 codec and so the example program listed won't work on the LCDK.

Donald

0 Nripendra Malhotra over 13 years ago in reply to Donald Reay

Prodigy 130 points

Thank you very much for the quick response. Now the next question, where can I get a example for the input output for the audio for LCDK (C6748 Dev Board) Thank you.

0 Donald Reay over 13 years ago in reply to Nripendra Malhotra

Expert 1545 points

The ftp site accompanying the book "Digital Signal Processing and Applications with the OMAP-L138 eXperimenter" has code for both the eXperimenter and for the LCDK. The differences in the code are confined largely to low level functions that, for example, inteface with the AIC3106. The LCDK uses McASP serializers 13 and 14 whereas the eXperimenter uses 11 and 12.

Have a look at this - I wrote some notes about using the book with the LCDK. Although I don't go into detail about how to initialise McASP - that's implicit in the LCDK version of the code.

http://e2e.ti.com/group/universityprogram/educators/f/776/t/223997.aspx

Donald

0 Nripendra Malhotra over 13 years ago in reply to Donald Reay

Prodigy 130 points

Donald, thank you very much for all the help I had so far. I did get alot of information about the HW and SW. I would like to ask you a few more questions, for which I did not get any information online.

1. Is there a complete design (package) where I can get peripherals like lcd, keyboard etc etc

2. I was reading in the chapter one of the book that some kind of OS can be installed on the ARM side of the board and C6748 can be used for DSP

3. Any other books (one mentioned above does not deal with peripherals) which deals with the peripherals that can be connected to L138/C6748 dev kit.

If you can get me going in one direction. Thank you.

Nipin

0 Nripendra Malhotra over 13 years ago in reply to Nripendra Malhotra

Prodigy 130 points

Donald, I have been able to do a lot of things with the C6748 board, I was able to connect to the window and linux OS's and was able to try some of the examples online. Thank you very much for your help. I would like to get some more information.

I also have a OMAP-L138 DSP+ARM9 LCDK. Now it comes with a pre-installed OS (on the micro SD) card. Are there any DSP examples that I can run using this on-chip OS that is provided by TI. Are there any books that can give a simple programs to run this board. Thank you.

This board can work as a One-Stop_Solution for some of our students working towards final year project or Masters.

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