topic Re: Vybrid ASRC sample code in Vybrid Processors

Vybrid ASRC sample code

stefansinger — Wed, 28 Aug 2013 08:45:07 GMT

Hi, we need to write an ASRC driver for our Audio Framework on Vybrid. Is there any sample code to start from ? I believe a similar (or identical ?) block has been used on i.MX6, but obviously on Vybrid the ASRC is supposed to work together with the eDMA, so any sample for that would be great.

Thanks

Stefan

Re: Vybrid ASRC sample code

karina_valencia — Wed, 11 Sep 2013 21:31:18 GMT

timesyssupport can you help on this case?

Re: Vybrid ASRC sample code

timesyssupport — Thu, 12 Sep 2013 15:10:41 GMT

Hello Stefan,

At the moment, I can't point to any direct reference. It looks like another thread here on the imxcommunity, https://community.freescale.com/message/332039#332039 takes advantage of the i.MX6 fsl-alsa-plugins to get this done rather easily.

We will need to review and see where we stand with the Vybrid kernel. I would expect we can follow up early week of 9/22.

Regards,

Timesys Support

Re: Vybrid ASRC sample code

juangutierrez — Thu, 12 Sep 2013 17:22:12 GMT

As a reference you can look at the linux driver implementation for imx6 at

the next directories:

<kernel_imx>/linux/drivers/mxc/asrc

<kernel_imx>/linux/include/linux/

<kernel_imx>/linux/sound/soc/imx/

<kernel_imx>/linux/sound/soc/codec/

and the next files:

mxc_asrc.c ASRC driver implementation codes including stream interface

mxc_asrc.h ASRC register definitions and export function declarations

imx-cs42888.c memory to ASRC to ESAI TX implementation in 7.1 audio codec machine driver.

imx-pcm-dma-mx2.c memroy to ASRC to ESAI TX implementation in 7.1 audio codec platform driver

imx-esai.c memroy to ASRC to ESAI TX implementation in 7.1 audio codec cpu driver.

cs42888.c memory to ASRC to ESAI TX implementation in 7.1 audio codec codec driver.

Re: Vybrid ASRC sample code

karina_valencia — Tue, 24 Sep 2013 15:20:30 GMT

timesyssupport do you have an update on this case?

Re: Vybrid ASRC sample code

stefansinger — Fri, 04 Oct 2013 18:33:05 GMT

Since the setup on Vybrid is quite a bit different, I am still struggling. The ASRC chapter in the Vybrid RM actually has some C code. Does anyone have this code or any other example ?