Re: [alsa-devel] Non-DMA ASoC driver

On 28/11/12 04:46, Craig McQueen wrote:

I'm exploring hardware options for an audio interface for a Freescale i.MX28-based embedded Linux device. One option is to use a Synchronous Serial Port interface to connect in slave mode to an external CODEC. I have several doubts about the feasibility of this option, but for now, I have just one question:

If we use this SSP, then we can't use DMA, but we would have to use interrupts for audio transfer. But I can't find any example code for a non-DMA based ASoC driver. Is it feasible to make a non-DMA based ASoC driver? How would it be implemented?

This has been done in sound/soc/fsl/imx-pcm-fiq.c and can be used as your platform driver.

Regards

Liam