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i2c read does not work #1

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mambrus opened this issue Jan 20, 2018 · 2 comments
Open

i2c read does not work #1

mambrus opened this issue Jan 20, 2018 · 2 comments

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@mambrus
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mambrus commented Jan 20, 2018 •
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Reading from i2c-bus using does not work.

Debugging one of the examples (new one: pwm) getAck does not work either. This is in spite of that, by using a bus-analyzer, ACK's are indeed present (sent from the chip). ACK:s are the last bit (9:th) in each byte sent and should be logic zero as in the graph below.
@mambrus
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mambrus commented Jan 20, 2018

i2cpca9685_getack_fails

Analog and digital analyze in image attached. Note the "Decoded protocols" to the right where ACK is seen.

The plot belongs to the following src/examples where also an extra debug-line is added: 04516f4#diff-e1387a4ed601b9800e90b406b3f5b90eR70

@mambrus mambrus mentioned this issue Jan 20, 2018
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mambrus commented Jan 20, 2018

Corresponding issue in parent-project: devttys0#33

Hopefully is still alive?

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