Previously we thought we were configuring the ADC for 8-bit values, but
we did so incorrectly. We were throwing away the top two bits of a
10-bit value. This never caused a problem because the only fixed
voltages we used were at the extreme minimum or maximum of the ADC
range.
Firmware now detects the hardware it is running on at startup and
refuses to run if it is compiled for the wrong platform. The board ID
returned by firmware to the host is now derived from run-time detection
rather than a compile-time value. A separate method to retrieve
compile-time supported platform is added.
On HackRF One, pin straps are checked to determine hardware revision.
This is informational to aid troubleshooting and does not affect any
function.
