Pico i.MX7Dual: I2S -> can not open pcm_out driver

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Pico i.MX7Dual: I2S -> can not open pcm_out driver

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toni1727
Contributor I

Good Day iMX community.

This question is regarding Android of Things.

I'm a little desperate. I2S seems not to work on Pico i.MX7Dual.

If I try to play a sound with audioTrack. In the raspberry pi 3 it works without problems, but if I execute it in imx7d it gives me the following error:

  • audio_hw_primary: card 0, port 0 device 0x1000000

  • audio_hw_primary: rate 48000, channel 2 period_size 0xc0

  • audio_hw_primary: can not open pcm_out driver 0: can not set hw params: Invalid argument

The same thing happens with an i2s microphone

This is the code:

final AudioDeviceInfo audioOuputDevice = findAudioDevice(AudioManager.GET_DEVICES_OUTPUTS, AudioDeviceInfo.TYPE_BUS);

    int mBufferSize = AudioTrack.getMinBufferSize(44100, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT);

        AudioFormat audioOutputFormat = new AudioFormat.Builder()
                .setChannelMask(AudioFormat.CHANNEL_IN_MONO)
                .setEncoding(AudioFormat.ENCODING_PCM_16BIT)
                .setSampleRate(44100)
                .build();

        audioTrack = new AudioTrack.Builder()
                .setAudioFormat(audioOutputFormat)
                .setBufferSizeInBytes(mBufferSize * 2)
                .setTransferMode(AudioTrack.MODE_STREAM)
                .build();

        audioTrack.setPreferredDevice(audioOuputDevice);
        audioTrack.setPlaybackRate(44100);
        audioTrack.setVolume(AudioTrack.getMaxVolume());

It is not about pins connections (J9: 3,6,10,7), It doesn't matter, connected or unconnected. Same Result

I changed the wav format. Same result too.

Thank you very much!

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CarlosCasillas
NXP Employee
NXP Employee

Hi Antonio,

I’m afraid that Pico i.MX7Dual board is not supported by NXP. You could redirect your question directly to TechNexion on the following link:

https://www.technexion.com/support/ 

Hope this will be useful for you.
Best regards!
/Carlos
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