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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 ;)
Debug is via SWO wherever possible, PA2 (tx only) on less capable cores
Pinouts:
board SCLK SDA
f4-disco PB8 PB9 i2c1
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