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i2c master mode tests.
While many of the disco boards have some form of i2c 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 I2C peripheral on all boards, and require/expect
a known fixed i2c slave device. (Eventually, this will be a soft
controllable i2c slave in the auto test setup ;)
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, uart (tx only) on less capable cores
Pinouts: (External PullUps REQUIRED!)
board SCLK SDA i2cperiph trigger uart
f4-disco PB8 PB9 i2c1 PB13
l1-disco PB8 PB9 i2c1 PB13
f072-disco PB8 PB9 i2c1 PB12 PA9!
Notes for monitoring with sigrok:
$ sigrok-cli -d fx2lafw -C D0=SDA,D1=SCL,D2=Trig -c samplerate=4Mhz:captureratio=4 --time=150ms -t Trig=r -o cap2.cli.sr
# Then open the .sr file in pulseview. something's wrong with decoding
# directly from the cli!
# or....
$ sigrok-cli -d fx2lafw -C D0=SDA,D1=SCL,D2=Trig -c samplerate=4Mhz:captureratio=4 --time=150ms -t Trig=r -P i2c:scl=SCL:sda=SDA
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