30 lines
1.1 KiB
Markdown
30 lines
1.1 KiB
Markdown
i2c master mode tests.
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While many of the disco boards have some form of i2c device onboard,
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which would, on the face of it, make testing easy, it's a different
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device on each board, and there are boards without it.
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Instead, use a known I2C peripheral on all boards, and require/expect
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a known fixed i2c slave device. (Eventually, this will be a soft
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controllable i2c slave in the auto test setup ;)
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the "trigger" pin is bounced when each iteration of the test code starts,
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allowing synchronization with a sigrok script that helps assure that
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results are as expected.
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Debug is via SWO wherever possible, PA2 (tx only) on less capable cores
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Pinouts: (External PullUps REQUIRED!)
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board SCLK SDA i2cperiph trigger
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f4-disco PB8 PB9 i2c1 PB13
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l1-disco PB8 PB9 i2c1 PB13
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Notes for monitoring with sigrok:
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$ 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
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# Then open the .sr file in pulseview. something's wrong with decoding
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# directly from the cli!
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# or....
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$ 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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