Reduce mic array driver memory footprint

xmos / xcore_iot

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Reduce mic array driver memory footprint #511

Closed xmos-jmccarthy closed 2 years ago

xmos-jmccarthy commented 2 years ago

By moving the mic array driver ISR buffer from ISR stack to state context, up to (configNUM_CORES -1) * MIC_ARRAY_CONFIG_SAMPLES_PER_FRAME * MIC_ARRAY_CONFIG_MIC_COUNT * 4 bytes worth of memory is saved.