i.MX Processorsのトピックimx6 ssi in network mode

imx6 ssi in network mode

j-g — Tue, 25 Mar 2014 19:25:58 GMT

Hello,

I am trying to configure the imx6 ssi to transmit 8 channels in network mode (TDM). I have a DSP that is providing frame sync (one clock bit) and bit clock to the imx6 (both are confirmed working). Frame sync is 48khz, bit clock is 6.144mhz (8 channels, 16 bits per channel)

SSI_SCR = 0x118 (network mode enabled, Synchronous mode selected, Two-channel mode enabled.)

SSI_STCR = 0x38F (Transmit frame sync is initiated one bit before the data is transmitted, one clock bit, active low frame sync, falling edge data, transmit FIFO 0 enabled, transmit FIFO 1 enabled, LSB Aligned)

SSI_STCCR = 0x4E700 (PM = 0, DC = 7, Word Length Control = 7, PSR = 0, DIV2 = 1)

In imx-ssi.c structure snd_soc_dai_driver_imx_ssi_dai I changed channels_min = 8 and channels_max = 8
In imx-pcm-dma-mx2.c structure snd_imx_hardware I changed channels_min = 8 and channels_max = 8

I use aplay to play a wav file, and get no data on the data line, aplay hangs. I should add that I did have this configured as I2S Slave (2 channel) with the DSP setup appropriately and that did work. Now that I'm trying to switch to network mode and 8 channels, I can't seem to get any data out.

Any advice/links/info would be greatly appreciated.

Re: imx6 ssi in network mode

Wlodek_D_ — Wed, 26 Mar 2014 12:56:12 GMT

Hello,

Thank you for your post, however please consider moving it to the right community place (e.g. i.MX Community ) to get it visible for active members.

For details please see general advice Where to post a Discussion?

Thank you for using Freescale Community.

Re: imx6 ssi in network mode

j-g — Wed, 26 Mar 2014 13:20:31 GMT

Thank you. Now moved to i.mx community.

Re: imx6 ssi in network mode

igorpadykov — Sun, 30 Mar 2014 11:04:17 GMT

Hi j-g , there are no examples for network mode with i.MX6, however one can look

at other i.MX processors examples (note, AUDMUX and SSI modules

are basically identical with minor modifications).

For ssi network mode please look at i.MX27 PDK examples,

check pdk10_imx27_Linux_RM.pdf (included in Doc bundle link below)

Table 20-1 "AUDMUX Source Files", sect.20.5 "Programming Interface (Exported API)"

"PDK_IMX27_LINUXDOCS_BUNDLE"

http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=i.MX27PDK&fpsp=1&tab=Documentation_Tab

For network mode one needs to set correctly also AUDMUX, for

better understanding it may be useful application note below

"Programming Audio Applications in the i.MX21"

http://cache.freescale.com/files/32bit/doc/app_note/AN2628.pdf

Re: imx6 ssi in network mode

j-g — Mon, 31 Mar 2014 11:46:34 GMT

Thank you for the information. It is truly appreciated.

Re: imx6 ssi in network mode

nguyenanhduc — Fri, 08 Jul 2016 03:56:10 GMT

Dear j-g,

Did you accomplish your project and could you please share your some of your experiences,

Thank you in advance,

Re: imx6 ssi in network mode

rosciio — Tue, 18 Oct 2016 12:40:32 GMT

Hi everyone,

i'm working on that argument. I would like configure the ssi into Network mode. I have done this, so, I modified the register to do it, but now I can't understand how linux show on user space "/proc/asound/card0/pcmX" X times my slot.

any one can explain me this?

thank you very much

Marco From Italy

Re: imx6 ssi in network mode

jerryyan — Thu, 27 Oct 2016 08:36:02 GMT

HI marco ,

I am also trying on this iisue, can you share your solution with me? Thanks

Re: imx6 ssi in network mode

rosciio — Fri, 16 Dec 2016 07:54:07 GMT

Hi, I'm sorry. I'm tring yet.

I would like use the same configuration of SGTL5000 (ssi) and show the new sample in the dma buffer. Now I have same problem to extract the correct sample.

Have you a solution or way?

Marco