Typo? RESETn is a low-active input so it wants a pullup, not pulldown...Yup, reset, a0, a1 and a2 pulled down.
The traces show you're getting a NAK to the first byte (chip address), so that needs to get fixed before anything else.
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Re: more i2c and mcp23017
Typo? RESETn is a low-active input so it wants a pullup, not pulldown...Yup, reset, a0, a1 and a2 pulled down.
The traces show you're getting a NAK to the first byte (chip address), so that needs to get fixed before anything else.
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