Accessing two channels of i2s

[Kashyap23]

Hi,I am using NRF5340 AUDIO DK BOARD and Ihave been trying to access i2s mic and I want to transfer the mic data to Amplifier .Is it possible to do with single I2s ? As I observe nrf5340  has two channels.If it possible how to configure pins for mic and amplifier as I have been using SCK,SDIN,LRCK but if want to configure for Amplifier what pins can I use for it as it doesn't have other SCK,LRCK pins.And I want to know difference between MCK and SCK in i2s configuration,Ihave attached the i2s configuration below.

[Turbo J]

The I²S peripherial can do both reading and writing at the same time - as long as you use the same clock signal(s).

We would need what I²S mics or codec chips you intend to use in order to help you further.

MCK and SCK are coarsly described in the PS and should appear in the datasheet of your I²S codec.

[Kashyap23]

So will it be possible getting mic data and sending mic data to Amplifier with same SCK,LRCK pins (p0.14,p0.16) for both,because I used SAI protocol in STM there it has 2 Channels of SAI A,SAI B which is two channel ,so it has dedicated pins for each channel where i have used one for MIC data collection and other channel for Amplification .So I want to know how in NRF i2s work with 2 channels where it has single clocks .I am using MIC SPH0645LM4H and Amplifier TAS2562YFPT

[Edvin]

I understand. In that case, I would recommend that you start with the audio sample, because it will be more work to add this to a barebone I2S application later.

Try to build the broadcast source configuration, and locate where it picks up the microphone signals.

Best regards,

Edvin

[Kashyap23]

Thanks Edvin,will check with that sample .Actually I am working with I2S echo saple where it have Rx and Tx using for getting audio and amplification respectively and I thought if I get raw data I can notify the data by creating service and characterstic via ble using Zephyr.Is this approach works?Will there be same working in your mentioned audio sample "broadcast source" ?

And to mention when I am using Echo sample ,I done changes to code as per my mic and added register address and able to read values from amplifier but I couldnt listen any audio from speaker amplifier ,I can listen only noise may be due to current leckage .I can see the clocks coming correctly from SDOUT i,e to amplifier.So can you help me in his regard.

 &pinctrl {
	i2c0_default_alt: i2c0_default_alt {
		group1 {
			psels = <NRF_PSEL(TWIM_SDA, 1, 2)>,
			<NRF_PSEL(TWIM_SCL, 1, 3)>;
		};
	};

	i2c0_sleep_alt: i2c0_sleep_alt {
		group1 {
			psels = <NRF_PSEL(TWIM_SDA, 1, 2)>,
			<NRF_PSEL(TWIM_SCL, 1, 3)>;
			low-power-enable;
		};
	};

	i2s0_default_alt: i2s0_default_alt {
		group1 {
			psels =<NRF_PSEL(I2S_SCK_M, 0, 26)>,
			<NRF_PSEL(I2S_LRCK_M, 0, 25)>,
			<NRF_PSEL(I2S_SDOUT, 0, 6)>,
			<NRF_PSEL(I2S_SDIN, 0, 7)>;
		};
	};
	i2s0_sleep_alt: i2s0_sleep_alt {
		group1 {
			psels =  <NRF_PSEL(I2S_SCK_M, 0, 26)>,
			<NRF_PSEL(I2S_LRCK_M, 0, 25)>,
			<NRF_PSEL(I2S_SDOUT, 0, 6)>,
			<NRF_PSEL(I2S_SDIN, 0, 7)>;
		};
	};
};

&i2c1 {
	status = "okay";
	pinctrl-0 = <&i2c0_default_alt>;
	pinctrl-1 = <&i2c0_sleep_alt>;
	pinctrl-names = "default", "sleep";

tas2563:tas2563@4C{
		compatible = "i2c-device";
		reg = <0x4C>;
		label = "TAS2653";
	};
};

&clock {
	hfclkaudio-frequency = <11289600>;
};

i2s_rxtx: &i2s0 {
	status = "okay";
	pinctrl-0 = <&i2s0_default_alt>;
	pinctrl-1 = <&i2s0_sleep_alt>;
	pinctrl-names = "default","sleep";
	clock-source = "ACLK";
};

[Edvin]

Kashyap23 said:

and I thought if I get raw data I can notify the data by creating service and characterstic via ble using Zephyr.Is this approach works?

Audio over BLE is quite different from "normal" BLE, so I would say that this is probably not going to work. The Audio channels in BLE are isochronous, while normal BLE is not. So please study the nrf5340_audio sample in order to get the BLE part of the audio up and running.

What I2S echo application are you using? 

Kashyap23 said:

done changes to code as per my mic and added register address and able to read values from amplifier but I couldnt listen any audio from speaker amplifier ,I can listen only noise may be due to current leckage

I don't understand. Did you manage to get sound from the microphone? And you forward it to the amplifier, but it sounds like noise only?

Best regards,

Edvin

[Kashyap23]

Ok thanks Edvin .I will go through the auddio sample.

Yes,I able to do that but I am not getting live audio .I am getting only noise

[Kashyap23]

Will I get update on it?

[Edvin]

Hello,

Did you get the time to look into the audio sample? Does that work with your speaker?

[Kashyap23]

No,I am not getting audio to speaker.Acutually first I need to make sure wheather this mic and amplifier configure or not otherwise I need to change with controller,if this works I will go through audio.I think this part of configuration is mandatory wheather I use audio sample or not.I don't know where its going wrong.Confirm me I can use configuration like below or not.I am using soeaker TAS2563 and MIC SPH0645 Of SCK 1.024MHz and LRCK 16 kHz .I am providing common clock for both.is it correct?

[Edvin]

I think you can connect SDIN and SDOUT as well, so that the signal will go directly from the microphone to the amplifier. Then you don't need to worry about outputing this signal to the amplifier, and you can concentrate on sending it via Bluetooth LE.

BR,
Edvin