hi EM,
This PDF, presents the I2C info in a pictorial form, easy to follow.
E

 

hi EM,
This PDF, presents the I2C info in a pictorial form, easy to follow.
E

Thanks a lot and sorry to trouble you and all members with dumb questions. Excuse the beginner!

 

Yes. You need to read the data sheet for specific details.

Can you provide me an example in simple terms?

 

Can you provide me an example in simple terms?

No, you need to read the datasheet. It really does not get much more simple than that. If you have a specific problem with implementing a function then ask.

 

"Many slave devices will require configuration upon startup to set the behaviour of the device".

For example, some of the configuration for an application using the MCP23017 to setup how the port pins are used...

mcp.write8(iodira,0x3f) # 8-13 inputs, 14 & 15 outputs
mcp.swrite8(iodirb,0xff) # 0-7 inputs
mcp.write8(gpioa,0x3f) # 8-13 high, 14 & 15 low
mcp.write8(gpiob,0xff) # 0-7 high
mcp.write8(gppua,0x3f) # pullups 8-13
mcp.write8(gppub,0xff) # pullups 0-7

There are many more functions that are available in this chip but were not used in this application, like interrupts....
So, the first thing you do when talking to just about any device other than a real dumb chip, is to select the functions you want to use.