audio_4x4.h

Generated from the header

This page is rodeo-sdk/common/audio_4x4.h — its comments and declarations. To change it, change the header.

rodeo::InitAudio4x4(hw);          // after hw.Init()
rodeo::StartAudio4x4(hw, Callback);

void Callback(daisy::AudioHandle::InputBuffer in,
              daisy::AudioHandle::OutputBuffer out, size_t size)
{
    // in[0..3] and out[0..3] are back-panel channels 1-4: 0/1 the Seed's
    // codec, 2/3 the CS4272.
}

This is Daisy Patch’s dual-codec setup with Rev B’s pins. SAI1 is rebuilt the way DaisySeed::Init configured it for the Seed it found (the directions differ on a Seed 1.1), so the Seed’s codec keeps working whichever module is fitted. Both run at 48 kHz, 24-bit left-justified, which the CS4272 is strapped for, with the Seed as clock master.

The CS4272 must stay in reset until SAI2’s MCLK and LRCK are running, and they only start with the audio, so StartAudio4x4() releases its reset (board::pin::kCodec2Reset) after starting it, and StopAudio4x4() puts it back. Its first few milliseconds out of reset are silence while it calibrates.

InitAudio4x4

void InitAudio4x4(daisy::DaisySeed& hw, size_t blocksize = 48);

Set up both codecs for four channels in and out. Call after hw.Init() and before StartAudio4x4(); holds the CS4272 in reset.

StartAudio4x4

void StartAudio4x4(daisy::DaisySeed& hw, daisy::AudioHandle::AudioCallback cb);

Start the audio with a four-channel callback, then release the CS4272.

StopAudio4x4

void StopAudio4x4(daisy::DaisySeed& hw);

Hold the CS4272 in reset, then stop the audio.