Re: [alsa-devel] Custom card returns "arecord: main:722: audio open error: Invalid argument"

Rob Nertney wrote:

static struct snd_pcm_hardware my_pcm_hw = { .info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID),

You must set one of INTERLEAVED, NONINTERLEAVED, or COMPLEX. (And a single channel should be marked interleaved.)

Regards, Clemens