The chip powers up with the IOCON register = 0, so you need to use the "IOCON.BANK=0" column of table 3-1 for the register addresses.
That puts GPIOA at address $12, not $09.
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Re: more i2c and mcp23017
The chip powers up with the IOCON register = 0, so you need to use the "IOCON.BANK=0" column of table 3-1 for the register addresses.
That puts GPIOA at address $12, not $09.
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