BF537, uClinux 2011R1, ad1939 CODEC, ALSA.
I am currently using an ad1939 CODEC as both a Frame and Bit Clk Master to a BF537, successfully.
I want to experiment with using the ad1939 CODEC as both a Frame and Bit Clk Slave to the BF537.
When I modify the Alsa driver, to do this, it gives an error.
When the ad1939 is specified as a both Frame and Bit Clk Master,
it is set as the following, in sound/soc/blackfin/bf5xx-ad193x.c, and is successful:
/* set cpu DAI configuration */
ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_DSP_A |
SND_SOC_DAIFMT_IB_IF | SND_SOC_DAIFMT_CBM_CFM); //CODEC is clk & FRM master.
if (ret < 0)
return ret;
/* set codec DAI configuration */
ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_DSP_A | //CODEC is clk & FRM master.
SND_SOC_DAIFMT_IB_IF | SND_SOC_DAIFMT_CBM_CFM);
if (ret < 0)
return ret;
But, when it is specified as a both Frame and Bit Clk Slave,
it is set as the following, and fails:
/* set cpu DAI configuration */
ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_DSP_A |
SND_SOC_DAIFMT_IB_IF | SND_SOC_DAIFMT_CBS_CFS); //CODEC is clk & FRM slave.
if (ret < 0)
return ret;
/* set codec DAI configuration */
ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_DSP_A |
SND_SOC_DAIFMT_IB_IF | SND_SOC_DAIFMT_CBS_CFS); //CODEC is clk & FRM slave.
if (ret < 0)
return ret;
The failure msg is: 'asoc machine hw_params failed'.
Three of the 4 possible Master/Slave combinations fail, with only the ad1939, as both Masters, succeeding.
