Merge pull request #1760 from jflyper/bfdev-fix-I2C3-default-pin
I2C3 (F4 targets) is on PA8/PC9
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@ -79,7 +79,7 @@ static void i2cUnstick(IO_t scl, IO_t sda);
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#define I2C3_SCL PA8
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#endif
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#ifndef I2C3_SDA
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#define I2C3_SDA PB4
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#define I2C3_SDA PC9
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#endif
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#endif
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