why the sai output signal(SAI2_TXD pin) is not sync with bclk(SAI2_BCLK)

snail246 · ‎10-29-2020

I use SAI2(chip imx6ull) with TDM mode, kernel config like these:

fmt = SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_NB_NF |
SND_SOC_DAIFMT_CBM_CFM;

snd_soc_dai_set_tdm_slot(cpu_dai, 0, 0, 16, 32);

DSP_A mode, channel 16, 32bit,

aplay special wav file, and its data is 0dB in channel0,

the msb bit31 is 0, other bits are 0,

igorpadykov · ‎02-01-2021

Hi snail246

what bsp used in the case, one can look at below dts

tdm hints :

Test sai2 using Chapter 7 Audio i.MX Linux Reference Manual

Best regards
igor