Hi: Now my driver is working (just) a bit better, but is still not functional... when i try to play something it says:

davinci_evm sound: ASoC: machine hw_params failed: -524 aplay: set_params:1297: Unable to install hw params: ACCESS: RW_INTERLEAVED FORMAT: S16_LE SUBFORMAT: STD SAMPLE_BITS: 16 FRAME_BITS: 32 CHANNELS: 2 RATE: 44100 PERIOD_TIME: (125011 125012) PERIOD_SIZE: 5513 PERIOD_BYTES: 22052 PERIODS: 4 BUFFER_TIME: (500045 500046) BUFFER_SIZE: 22052 BUFFER_BYTES: 88208 TICK_TIME: 0

Some hints or docummentation of this? remember i'm a noob Thanks

Message: 2 Date: Tue, 5 Jan 2016 21:35:12 -0300 From: Pablo Fonovich pablo_f_7@hotmail.com To: "alsa-devel@alsa-project.org" alsa-devel@alsa-project.org Subject: [alsa-devel] PCM3168 alsa driver for beaglebone black Message-ID: BAY169-W8142231FA115FDA205200FEEF40@phx.gbl Content-Type: text/plain; charset="iso-8859-1"

Hi: I'm working in a project of making an audio cape for beaglebone black with pcm3168 codec... so far i've written the driver i've attached based on pcm1681.c available in linux kernel. Im a noob in this subjets, so i would like to know how can now make it work in my custom system for the beaglebone. I followed the guide in this link http://processors.wiki.ti.com/index.php/Sitara_Linux_Audio_DAC_Example, but it makes me write the ops and hw structures that i already have in my pcm3168.c file, in the davinci_evm.c file.

The drivers compiles and is detected at boot time, as it says in the guide. But when i type aplay command to play some wav, the message "ALSA lib pcm.c:2267:(snd_pcm_open_noupdate) Unknown PCM default aplay: main:722: audio open error: No such file or directory" appears, so i'm missing something...

I don't knwo if this post belongs to this list, but any help would be great... If some docummentation about writing a driver for an embedded system is available, please tell me... Also, if someone can suggest me some guidelines of work i would be grateful, cause i just can't get organized with the information i found

Thanks very Much...

Pablo