MCP23016 I2C serial I/O expander chip

[GeoJoe]

Thanks Jeff.............
An email to melabs support got me the answer. Here it is:
I2Cread portc.4, portc.3, %01000000, command, [insin], noitwoc

Where command is what register you want to read 0 or 1. Now I get the value of the I/O expansion chip into the variable insin. Just missed the brackets around the variable name!

Now I'm trying to figure out the write command. Some difficulties, I'll post my results. Hope this helps someone. This is a nice chip set. The I/O's on pics go fast. Faster and faster the deeper I get into designing with them.

Joe

[GeoJoe]

i2cwrite portc.4, portc.3, %01000010, %00000111, [%00000000] ' SET U9 PORT 1 TO OUTPUTS
i2cwrite portc.4, portc.3, %01000010, %00000011, [acout] ' WRITE VARIABL ACout TO U9 PORT 1 LATCH REGISTER
insin = 0
i2cread portc.4, portc.3, %01000000,[insin]', noitwoc ' READ U8 PORT 0 AND 1 PIN STATES
i2cread portc.4, portc.3, %01000010, %00000000, [inson] ' READ U9 PORT 0 PIN STATES

Here are the write and read lines I've found to be successful with the MCP23016 I/O expander chip.

Use in good health.