A nice post on using the PRUs in the Beaglebone to sample at 1MSps. Makes me wonder why we are having so many problems reading an 4x4 keyboard!
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I have finished the circuit and code for short-burst (4 second) 1MSps sampling on the #Beaglebone PRU-ICSS using the 12-bit ADS7883 SPI ADC. It works well, but the ADS7883 is tiny (SOT23!) and requires an adapter board and careful soldering for prototyping use. I have added a full description with example outputs at: http://exploringbeaglebone.com/chapter13/#The_ADS7883_Single-Channel_12-bit_ADC_1MSps_max
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