I2S library using DMA, ready for try out. #336
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This library originates from the CurieI2S\src\CurieI2SDMA module. It forms the physical layer of the Sound library concept from Arduio. The library utilizes two drivers: soc_i2s and soc_dma. The library performs I2S I/O in blocks of audio data via DMA cbannels.
To prevent the I2S SCK clock from glitching during DMA block transfer, the DMA is set up to send out data from two buffers continuously without stopping until it is told to do so.
This version is intended for a wider unit testing.
SidLeung
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