Other Parts Discussed in Thread: PCM1864, TIDA-01454, PCM5102A
Hello I want to record 8 channels from TIDA-01454 CMB into a Beaglebone AI. As the CMB is built with two PCM1864 ADCs and it is also a Beagle board, I followed this guide(https://www.ti.com/lit/an/sprac97/sprac97.pdf) with some changes(channels_max=16) .
#include <linux/init.h> #include <linux/module.h> #include <linux/platform_device.h> #include <sound/soc.h> static struct snd_soc_dai_driver pcm5102a_dai = { .name = "pcm5102a-hifi", .playback = { .channels_min = 2, .channels_max = 2, .rates = SNDRV_PCM_RATE_8000_192000, .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE }, .capture = { .stream_name = "Capture", .channels_min = 1, .channels_max = 16, .rates = SNDRV_PCM_RATE_8000_192000, .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE }, }; static struct snd_soc_codec_driver soc_codec_dev_pcm5102a; static int pcm5102a_probe(struct platform_device *pdev) { return snd_soc_register_codec(&pdev->dev, &soc_codec_dev_pcm5102a, &pcm5102a_dai, 1); } static int pcm5102a_remove(struct platform_device *pdev) { snd_soc_unregister_codec(&pdev->dev); return 0; } static const struct of_device_id pcm5102a_of_match[] = { { .compatible = "ti,pcm5102a", }, { } }; MODULE_DEVICE_TABLE(of, pcm5102a_of_match); static struct platform_driver pcm5102a_codec_driver = { .probe = pcm5102a_probe, .remove = pcm5102a_remove, .driver = { .name = "pcm5102a-codec", .of_match_table = pcm5102a_of_match, }, }; module_platform_driver(pcm5102a_codec_driver); MODULE_DESCRIPTION("ASoC PCM5102A codec driver"); MODULE_AUTHOR("Florian Meier <florian.meier@koalo.de>"); MODULE_LICENSE("GPL v2");
I have managed to record audio from 4 of the 8 microphones that the CMB has(I just tap the mic to check if that one is working). However I want to record the 8 channels. Currently the working microphones are MIC1, MIC4, MIC5 and MIC8, although I would say there is much noise.The CMB has 4 data output pins, so I suppose each one transmits 2 channels, so the problem is that each pin is getting mono instead of mono. This might be because a problem in DTS, therefore this is my dts file:
pcm5102a: pcm5102a { #sound-dai-cells = <0>; compatible = "ti,pcm5102a"; status = "okay"; }; sound {compatible = "simple-audio-card"; simple-audio-card,format = "i2s"; simple-audio-card,name = "PCM5102a"; simple-audio-card,bitclock-master = <&sound1_master>; simple-audio-card,frame-master = <&sound1_master>; simple-audio-card,bitclock-inversion; simple-audio-card,cpu { sound-dai = <&mcasp1>; }; sound1_master: simple-audio-card,codec { #sound-dai-cells = <0>; sound-dai = <&pcm5102a>; //clocks = <&mcasp1_fck>; //clock-names = "mclk"; }; }; &mcasp1 { #sound-dai-cells = <0>; pinctrl-names = "default"; pinctrl-0 = <&mcasp1_pins>; status = "okay"; op-mode = <0>; /* MCASP_IIS_MODE */ tdm-slots = <2>; num-serializer = <4>; serial-dir = < /* 1 TX 2 RX 0 unused */ 2 2 0 0 0 0 0 0 0 0 2 2 >; rx-num-evt = <4>; tx-num-evt = <4>; };
I connected the pins DATA1-MiniDSP, DATA2-MiniDSP, DATA3-MiniDSP and DATA4-MiniDSP in J5(of the CMB) to these pins in my Beaglebone:
P9.18b 173 fast rx 0 mcasp 0 d0 mcasp@48460000 (mcasp1_pins)
P9.17b 174 fast rx 0 mcasp 0 d1 mcasp@48460000 (mcasp1_pins)
P9.30 183 fast rx 0 mcasp 0 d10 mcasp@48460000 (mcasp1_pins)
P9.28 184 fast rx 0 mcasp 0 d11 mcasp@48460000 (mcasp1_pins)
I also conected DATA1-MiniDSP, LRCLK and BCLK to an external I2S DAC to make a test and I could hear MIC1 and MIC2. So I can assure that outputs are coming in stereo. My problem is that when connect the outputs to Beaglebone and record, I just get 1 of those 2 channels for each DOUT. I checked all of them just in case with the external I2S DAC:
Data 1 is giving MIC1 and MIC2
Data 2 is giving MIC5 and MIC6
Data 3 is giving MIC3 and MIC4
Data 4 is giving MIC7 and MIC8
So what is wrong? How can I get all the mics?