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 with some changes in oder to make it compatible with Beaglebone AI. 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 and therefore this is my dts file:
&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 because those are the ones available in Beaglbone AI. This is my configuration for the CMB:
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 am I missing to get the 8 channels?