Peter Johnson 6307d41002 SPI: Provide byte[] JNI interfaces. ...

This avoids a direct byte buffer allocation on every read/write/transaction
for the byte[] variants.

Also change spiGetAccumulatorOutput() to directly set the AccumulatorResult
object, avoiding a ByteBuffer allocation.

Changes HAL SPI interfaces to use const for dataToSend.

Fixes #733.

2017-11-17 09:36:57 -08:00

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