Hi! I have an issues with a modem connected to the SAIF port of an imx28. I have the following configuration running on the modem: -modem is slave(but still have to fix the clock at 256 khz) -"short frame" sync. PCM data is always formatted as 16-bit uncompressed two’s complement. Also, all PCM data and frame synchronization signals are written to the PCM bus on the rising clock edge and read on the falling edge. - 16 bits liniar sample, MSB first.

On the imx side i have the following configuration

priv->sysclk = 512 * rate; snd_soc_dai_set_clkdiv(cpu_dai, IMX_SSP_SYS_MCLK, 32); dai_format = SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_IB_NF | SND_SOC_DAIFMT_CBM_CFM;

snd_soc_dai_set_sysclk(cpu_dai, IMX_SSP_SYS_CLK, priv->sysclk, SND_SOC_CLOCK_OUT);

The modem has the 2 options for testing, either outputing a tone or an audio loop. My problem is that i cannot receive anything else but noise.

arecord -f S16_LE -c2 -r8000 test.wav hexdump -C test.wav

00000000 52 49 46 46 24 c4 09 00 57 41 56 45 66 6d 74 20 |RIFF$...WAVEfmt | 00000010 10 00 00 00 01 00 02 00 40 1f 00 00 00 7d 00 00 |........@....}..| 00000020 04 00 10 00 64 61 74 61 00 c4 09 00 00 00 00 00 |....data........| 00000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| * 00040f10 00 00 00 00 f0 03 00 00 00 00 00 00 00 00 00 00 |................| 00040f20 00 00 0f 00 ff ff ff ff ff ff f0 ff fc 00 00 00 |................| 00040f30 00 00 00 00 00 00 00 00 00 00 ff 01 ff ff ff ff |................| 00040f40 00 fc 03 00 00 e0 00 00 00 00 00 00 00 00 00 00 |................| 00040f50 00 00 ff 1f ff ff ff ff 00 ff ff 1f 00 f8 00 00 |................| 00040f60 00 00 00 00 00 00 00 00 03 00 ff ff ff ff ff ff |................| 00040f70 81 ff ff ff 00 00 00 00 00 00 00 00 00 00 00 00 |................| 00040f80 3f 00 ff ff ff ff 80 ff 00 00 00 00 00 00 00 00 |?...............|

When i select the audio loop mode, play a wav sample, and record it at the same time, i hear noise every time i play that wav and silence between them(so something is moving out there)

Do you have any suggestions on why this is happening? Regards.