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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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The ADC data takes a while to start working after power on; wait for
the range of input values to look reasonable before using the data.
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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Check to make sure we aren't repeating a block coming from the
unwhitened source, which is the standard online FIPS test for RNGs.
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 loads the map view with the selected area when the site entry is
changed or the user hits return in the lat/lon fields. This lets you
see the target launch site without having to load the whole preload set.
Signed-off-by: Keith Packard <keithp@keithp.com>
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This replaces having the single output switch based on a pin value and
allows us to box the device and still fetch raw data.
For now, this will use a special libusb2 program, ao-chaosread, to
pull bits as I haven't figure out how to make linux provide two
/dev entries for one USB device.
Signed-off-by: Keith Packard <keithp@keithp.com>
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This detects broken hardware by making sure the standard deviation in
the raw values used to compute each buffer is at least 128.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Looks like it takes about 70ms for the supply to start running right,
so delay after powering it up for that long.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Support suspend/resume of the TRNG power supply, delaying after resume
to wait for it to stabilize.
Signed-off-by: Keith Packard <keithp@keithp.com>
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This lets the HV supply stabilize before we start sampling values.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Plug the 'force bootloader' thing onto the board while it's running
and it will generate raw bits instead of running them through the CRC
to whiten. Useful for validating the raw hardware.
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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Signed-off-by: Keith Packard <keithp@keithp.com>
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