Hi pl.krzy
I'm wondering if you have go further in this issue. Right now I'm using
mcasp (master) AM3354 board and an audio codec (slave). MLCK (ahclkx) and
BCLK (aclkx) shows a 24MHz clock (when it needs MCLK = 48KHz x 256 and BLCK
= 48KHz x 62 (32bits x 2ch).
As base I'm using this file
<http://lxr.free-electrons.com/source/sound/soc/davinci/davinci-evm.c?v=3.2>
and
my init looks like:
#define AUDIO_FORMAT (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS |
SND_SOC_DAIFMT_IB_NF)
static int evm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *codec_dai = rtd->codec_dai;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
int ret = 0;
unsigned sysclk;
printk(KERN_ALERT "DEBUG(%s):\n", __FUNCTION__);
sysclk = 24576000;
printk(KERN_ALERT "DEBUG(%s): cpu snd_soc_dai_set_fmt\n", __FUNCTION__);
/* set cpu DAI configuration */
ret = snd_soc_dai_set_fmt(cpu_dai, AUDIO_FORMAT);
if (ret < 0)
return ret;
printk(KERN_ALERT "DEBUG(%s): codec snd_soc_dai_set_fmt\n", __FUNCTION__);
/* set codec DAI configuration */
ret = snd_soc_dai_set_fmt(codec_dai, AUDIO_FORMAT);
if (ret < 0)
return ret;
sysclk = 256*48000;
// cpu
// printk(KERN_ALERT "DEBUG(%s): cpu snd_soc_dai_set_sysclk=%d\n",
__FUNCTION__ , sysclk);
// ret = snd_soc_dai_set_sysclk(cpu_dai, 0, sysclk, SND_SOC_CLOCK_OUT);
// if (ret < 0)
// return ret;
// codec
printk(KERN_ALERT "DEBUG(%s): codec snd_soc_dai_set_sysclk=%d\n",
__FUNCTION__ , sysclk);
ret = snd_soc_dai_set_sysclk(codec_dai, 0, sysclk, SND_SOC_CLOCK_IN);
if (ret < 0)
return ret;
return 0;
}
Please can you share your toughs with me?
BR,
Sergio
El martes, 13 de enero de 2015, 18:58:37 (UTC+1), [email protected]
escribió:
>
> Hi,
> I am working with beaglebone/am335x and would like to use McASP (Creating
> human signal generator :)). I think I almost did it but it's not working
> properly yet.
>
> With a help form Ti-wiki
> <http://processors.wiki.ti.com/index.php/Sitara_Linux_SDK_Audio_DAC_Example>.
> I do:
> - create driver for PCM1690
> - build driver to kernel
> - configure ALSA machine layer
> - add everything to Device Tree
> - then enable it in kernel
>
> As a platform I use sitarta-TI Linux Image and SDK from TI (great tools
> thx :P).
>
> What is coming out from my processor (measure by oscilloscope):
> -AHCLKX (~24MHz ~ 512xfs)
> -FSX (50kHz)
> -ACLKX(1.6MHz ~ 32xfs)
> -AXR0 (Some data)
>
> And my PCM1690 have register 69 (0x45) which is changing if PCM see any
> inputs. It's works but I still see no output from my DAC.
>
> From start I have 3 questions:
> 1. When I play 48kHz wav files (example
> /usr/share/sound/alsa/Front_left.wav or speaker-test -c 2. My 'fs' is
> 48kHz right? So why my FSX is 50kHz? Shouldn't be 48kHz?
> 2. How to set properly AHCLKX? In wiki there was no need to even turn it
> on. My DAC needs it and I lunch it by adding this 2 lines in
> davinci-mcasp.c file to section:
> "case SND_SOC_DAIFMT_CBS_CFS:
> /* codec is clock and frame slave */"
> //my code
> mcasp_set_bits(mcasp, DAVINCI_MCASP_PDIR_REG, AHCLKX);
> mcasp_set_bits(mcasp, DAVINCI_MCASP_AHCLKXCTL_REG, AHCLKXE);
>
> But It's let me only to output 24MHz, but I want to change it depends on
> my fs rate (I should have exactly 512xfs, now its only close to this) I
> guess It should be in davinci-evm.c where I set ACLKX. Here is my code
> where I do this:
>
> unsigned int bclk_freq = evm_get_bclk(params);
> unsigned sysclk = ((struct snd_soc_card_drvdata_davinci *)
> snd_soc_card_get_drvdata(soc_card))->sysclk;
> int ret;
> ret = snd_soc_dai_set_clkdiv(cpu_dai, 1, sysclk/bclk_freq);
>
> So I set divider from my sysclk (default 24MHz in sitara-TI procesors). So
> how to change also AHCLKX (Is there a mirror divider as I do with ACLKX?)
> 3.Why my PCM not working? xD Or more precise where you advise me to look
> for mistakes or answers? Maybe I should try with polarity of my signals? Or
> with PCM169 configuration?
>
> If you need any more outputs, informations or even screen from
> oscilloscope, do not hesitate to ask me. I will replay as fast as I can and
> with all my knowledge I have/will get.
>
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