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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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Gcc 5.4.1 tracks alignment of data through assignments, so that a
uint32_t pointer which comes from byte-aligned uint8_t data:
extern uint8_t foo[];
uint32_t *q = (void *) foo;
Fetches and stores through this pointer are done bytewise. This is
slow (meh), but if q references a device register, things to bad very
quickly.
This patch works around this bug in the compiler by adding
__attribute__((aligned(4))) tags to some variables, or changing them
from uint8_t to uint32_t. Places doing this will now be caught as I've
added -Wcast-align to the compiler flags. That required adding (void
*) casts, after the relevant code was checked to make sure the
compiler could tell that the addresses were aligned.
Signed-off-by: Keith Packard <keithp@keithp.com>
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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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