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Altera_Forum
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15 years ago

I2C Woes, Opencore and Terasic

I've been trying to get a functional I2C bus in my design for a while now with no luck. I've tried my own and a few open source cores. ALL of them have the same problem. I never receive ACKs. I canno...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Unfortunately, the second waveform has the start bit and several bits cut on the left. But as far as I understand, both are sending 0xBA as address byte, as the analyzer decodes. In, the lower waveform, the address is acknowledged, in the upper it isn't. Assuming, that a slave hearing on this address is connected in both cases, there are two explanations:

- the slave is stuck somehow (shouldn't happen after a stop)

- SDA is erroneously driven high by the master, overriding the slave