DA830 DSK: Unable to open McASP driver to receive from AIC3106 DAC

David Kelly

CCS: Version: 4.1.1.00014

bios_6_21_00_13
pspdrivers_02_00_01
xdais_6_25_01_08
xdctools_3_16_02_32
edma3_lld_02_00_01_04
ipc_1_00_05_60

Platform: Spectrum Digital DA830 DSK Rev G

Hello,

I'm attempting to modify the working sample AIC3106 code that came from Spectrum Digital to use the PSP McASP and IPC Stream drivers.

I can successfully create a stream for transmitting data to the AIC3106 DAC, but I am unable to create a stream for receiving. I started with the AIC3109 loopback sample code which access the McASP registers directly and works fine. Using the same McASP and PINMUX settings, but using the McASP PSP driver, I get a failure:

ti.psp.mcasp.Mcasp: line 3527: E_timeout: Operation timedout during setting GBCTL register

The problem is in setting the RCLKRST bit in line 2349 of mcasp.c. The high speed clock resets fine, but the bit clock, which should be divided down from the high speed clock, does not reset.

The original Spectrum Digital Code is here:

http://support.spectrumdigital.com/boards/dskda830/revc/DSKDA830_BSL_RevC.zip

The project is: DSK DA830 REV C\DSKDA830_BSL_RevC\dskda830_v1\dsp\tests\aic3106

I've attached the project if someone can reproduce this and help me figure out what is wrong.

1157.DA830_AIC3106_mcaspTest.zip

Thanks

David Kelly

over 16 years ago

0 David Friedland over 16 years ago

TI__Mastermind 18320 points

Forwarding this to BIOS PSP team...

0 Visuvanadan Pasupathy over 16 years ago in reply to David Friedland

TI__Intellectual 1135 points

Hi David Kelly

From the problem description I understand the following

1)Mcasp is in slave mode and expects clock from device (in your case ADC) which is the stock configuration of PSP.

2) ADC is in slave mode expecting clock from master (may be the stock configuration of SD BSL package)

Please note that mcasp bit clock could not be reset if there is no valid clock. Please ensure the master slave configuration is set correctly by

1) by either confguring the mcasp into master mode OR

2) by configuring the ADC in master mode.

This will enable the bit clock section of Mcasp to get valid clock and hence it could be reset properly.

regards

Vichu

0 David Kelly over 16 years ago in reply to Visuvanadan Pasupathy

Intellectual 485 points

Thanks for the reply, though I had already configured it that way.

Turns out that the AIC3106 bit and word clock lines are only connected to the McASP1 transmit clocks only, and not the receive. The loopback mode relies on the transmit clocks in synchronous mode.

Thanks

David Kelly

Processors

Processors forum

DA830 DSK: Unable to open McASP driver to receive from AIC3106 DAC