spi-master: initial busy sending test stub.

Basic framework.  now we can build on it.

1 files changed, 25 insertions, 0 deletions

diff --git a/tests/spi-master/README.md b/tests/spi-master/README.md
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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		SCK	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 -l 4 2>/dev/null | grep -- -data