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).
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, I suppose each one transmits 2 channels, so the problem is that each pin is getting mono instead of stereo. 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>;
};
The serial-dir is that way because I use mcasp1_axr0, mcasp1_axr1, mcasp1_10 and mcasp1_axr11 ,those are the ones available in Beaglbone AI. 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
In case it helps, here is myDummy CODEC:
#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");
and also my CMB configuration:
uint8_t U1_PCM1864_CONFIG[][2] = {
{0x00, 0x00}, // Change to Page 0
{0x01, 0x40}, // PGA CH1_L to 32dB
{0x02, 0x40}, // PGA CH1_R to 32dB
{0x03, 0x40}, // PGA CH2_L to 32dB
{0x04, 0x40}, // PGA CH2_R to 32dB
{0x05, 0x86}, // Enable SMOOTH PGA Change; Independent Link PGA;
{0x06, 0x41}, // Polarity: Normal, Channel: VINL1[SE]
{0x07, 0x41}, // Polarity: Normal, Channel: VINR1[SE]
{0x08, 0x44}, // Polarity: Normal, Channel: VINL3[SE]
{0x09, 0x44}, // Polarity: Normal, Channel: VINR3[SE]
{0x0A, 0x00}, // Secondary ADC Input: No Selection
{0x0B, 0x44}, // RX WLEN: 24bit; TX WLEN: 24 bit; FMT: I2S format
{0x10, 0x03}, // GPIO0_FUNC - SCK Out; GPIO0_POL - Normal
{0x11, 0x50}, // GPIO3_FUNC - DOUT2; GPIO3_POL - Normal
{0x12, 0x04}, // GPIO0_DIR - GPIO0 - Output
{0x13, 0x40}, // GPIO3_DIR � GPIO3 - Output
{0x20, 0x11} // MST_MODE: Master; CLKDET_EN: Disable
};
uint8_t U2_PCM1864_CONFIG[][2] = {
{0x00, 0x00}, // Change to Page 0
{0x01, 0x40}, // PGA CH1_L to 32dB
{0x02, 0x40}, // PGA CH1_R to 32dB
{0x03, 0x40}, // PGA CH2_L to 32dB
{0x04, 0x40}, // PGA CH2_R to 32dB
{0x05, 0x86}, // Enable SMOOTH PGA Change; Independent Link PGA;
{0x06, 0x41}, // Polarity: Normal, Channel: VINL1[SE]
{0x07, 0x41}, // Polarity: Normal, Channel: VINR1[SE]
{0x08, 0x44}, // Polarity: Normal, Channel: VINL3[SE]
{0x09, 0x44}, // Polarity: Normal, Channel: VINR3[SE]
{0x0A, 0x00}, // Secondary ADC Input: No Selection
{0x0B, 0x44}, // RX WLEN: 24bit; TX WLEN: 24 bit; FMT: I2S format
{0x10, 0x00}, // GPIO0_FUNC – GPIO0; GPIO0_POL - Normal
{0x11, 0x50}, // GPIO3_FUNC - DOUT2; GPIO3_POL - Normal
{0x12, 0x00}, // GPIO0_DIR - GPIO0 - Input
{0x13, 0x40}, // GPIO3_DIR � GPIO3 - Output
{0x20, 0x01} // MST_MODE: Slave; CLKDET_EN: Enable
};
So what is wrong? How can I get all the mics?