2010-06-09 13:24:05 BF537 STAMP with AD1836 daughter board on SPORT1

Adam Rosenberg (UNITED STATES)

Message: 90226

I am writing a driver for a custom board to play audio using SPORT1 to a Cirrus Logic CS42448.

I am first learning about the SPORT using the BF537 STAMP with AD1836 daughter board on SPORT1. When I use the tone program to test this configuration I hear a short bit of static and then nothing, followed by an error.

After this error I moved the daughter board to SPORT0 and changed the kernel configuration to match. I then recompiled and loaded the change to the STAMP. The same exact test now works perfectly.

I have searched known bugs in the tracker here but found no mention of this.

Is there a known reason why the AD1836 driver would work with SPORT0 but not with SPORT1?

Thank you,

Adam

Here is the program output from the STAMP using SPORT1 with debugging turned on:

root:/> tone

ALSA sound/blackfin/ad1836.c:896: snd_ad1836_playback_open

ALSA sound/blackfin/ad1836.c:924: snd_ad1836_capture_open

ALSA sound/blackfin/ad1836.c:988: snd_ad1836_hw_params

TONE: generating sine wave at 1000 Hz...ALSA sound/blackfin/ad1836.c:1085:

snd_ad1836_playback_prepare channels:2, period_bytes:0x4000, periods:2

ALSA sound/blackfin/ad1836.c:1145: snd_ad1836_playback_trigger

ALSA sound/blackfin/ad1836.c:1181: playback cmd:start

ERROR: write(/dev/dsp) failed, errno=5

ALSA sound/blackfin/ad1836.c:1145: snd_ad1836_playback_trigger

ALSA sound/blackfin/ad1836.c:1181: playback cmd:stop

ALSA sound/blackfin/ad1836.c:1027: snd_ad1836_hw_free

ALSA sound/blackfin/ad1836.c:965: snd_ad1836_capture_close

root:/>

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2010-06-12 00:05:13 Re: BF537 STAMP with AD1836 daughter board on SPORT1

Barry Song (CHINA)

Message: 90272

Adam,

Can you tell us which release are you using and what board are you using? Do your board has hardware conflict on SPORT1 pins?

-barry

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2010-06-21 09:34:50 Re: BF537 STAMP with AD1836 daughter board on SPORT1

Adam Rosenberg (UNITED STATES)

Message: 90506

Barry,

I am using uClinux-dist-2009R1.1-RC4 with the ADZS-BF537-STAMP V2.1 and daughter board STAMP/SPORT-AD1836A V0.9

I have no other boards attached and nothing else in the kernel is configured to use SPORT1 as far as I know. Since it works well on SPORT0 but not on SPORT1, could this be a hardware problem with the versions of the boards that I am using?

Thanks,

Adam

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2010-06-09 13:24:05 BF537 STAMP with AD1836 daughter board on SPORT1