Rafael Guayer wrote: > The plataform driver and the I2S hardware on the ARM SoC supports sample > resolutions of 16, 20 and 24 bits, and word sizes of 16, 20, 24 and 32 > bits. Signed, little or big endian. > > The i2s-DMA plataform driver and hardware, only 8, 16 and 32 bits transfers > are possible. > > The problem is the CODEC (CS4245 Cirrus Logic), that, for I2S format, > supports only 24 bit resolution in 32 bit words, signed, litle endian
The format on the I²S bus is pretty much independent from the format that the DMA controller reads from/writes to memory. > In the i2s plataform driver, in *_hw_params, when params_format(params) == > SNDRV_PCM_FMTBIT_S24_3LE, 24-bit words not supported by the DMA platform driver. > What is this widely used format for 24bits on ALSA? SNDRV_PCM_FORMAT_S32_LE. Apparently, it's the only one that your DMA hardware supports for 24-bit samples. Regards, Clemens _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/listinfo/linux-audio-dev
