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This improves the USB performance of ChaosKey so that it doesn't NAK
during data transfers at all.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Using this slower clock eliminates sampling problems with the ADC and
cleans up the chaoskey raw data.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Signed-off-by: Keith Packard <keithp@keithp.com>
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This also changes the DMA interface a bit so we can select for
interrupts on only the interesting channels.
Signed-off-by: Keith Packard <keithp@keithp.com>
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This better matches the documented cal sequence.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Instead of requiring that the whole set of returned values fit
precisely in the ring, allow for wrap-around so that we can fetch an
odd number of ADC values. The previous version required that the fetch
amount always be a factor of the ADC buffer size.
Signed-off-by: Keith Packard <keithp@keithp.com>
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This was configuring the hardware wrong, and wasn't keeping the output
ring full.
Signed-off-by: Keith Packard <keithp@keithp.com>
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This creates a ring buffer for ADC data so that ADC fetching can run
in parallel with other activities.
Signed-off-by: Keith Packard <keithp@keithp.com>
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The ADC api is what USBtrng wants; a way to repeatedly read a single
ADC input as fast as possible.
Signed-off-by: Keith Packard <keithp@keithp.com>
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