In your "working" example 2 you're actively driving the pins high and low.
I2C is an open-drain/collector bus where the high level speed is determined in part by the pullup values.
To reduce the rise time, lower the values to 4.7K or thereabouts
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Re: I2CWRITE/I2CREAD access hardware in the different way? (PCA9685 issues)
In your "working" example 2 you're actively driving the pins high and low.
I2C is an open-drain/collector bus where the high level speed is determined in part by the pullup values.
To reduce the rise time, lower the values to 4.7K or thereabouts
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