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SPI master mode tests
While some of the disco boards have some form of spi device onboard,
which would, on the face of it, make testing easy, it's a different
device on each board, and there are boards without it.
Instead, use a known SPI peripheral on all boards, and require/expect
a known fixed SPI slave device. Use a soft controller SPI slave device
for the far side, for double the test coverage!
the "trigger" pin is bounced when each iteration of the test code starts,
allowing synchronization with a sigrok script that helps assure that
results are as expected.
Debug is via SWO wherever possible, PA2 (tx only) on less capable cores
Pinouts:
(red) (orange) (yellow)(brown) (black)
board CLK MISO MOSI CS periph trigger
f4-disco PB13 PB14 PB15 PB12 spi2 PB11
l1-disco PB13 PB14 PB15 PB12 spi2 PB11
Notes for monitoring with sigrok:
$ sigrok-cli -d fx2lafw -C D0=TRIG,D1=CS,D2=CLK,D3=MISO,D4=MOSI -c samplerate=12Mhz:captureratio=4 --time=150ms -t TRIG=r -P spi:clk=CLK:miso=MISO:mosi=MOSI -A spi=mosi-data
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