Re: [Botix-devel] HAL for Botix

[Ger A. <in...@ge...>]

Hi WOuter

>For i2c we can use some kind of virtual device, which is what the
>compass driver uses when executing commands. Port expanders can use
>multiple pins and just have to be defined, right?
>  
>
Yeah, mine have got 8 io pins each. When read, you get a byte containing 
the entire set of bits. You've got to AND them with a bitmask to 
determine if a single bit is high or low.
They can be used as output too.

>Device linking is possible, so led1 is connected to portexpander port 1
>which is at its turn connected to a set of avr pins. (right?) 
>
>  
>
nope, the expander is connected to i2c. You're talking about a shift 
register. (cheaper, but requires a number of io pins.)

>>Is it possible to include the driver-includes only when they are 
>>actually used?
>>
>>    
>>
>
>Yep no problem, so the more we stuff things in drivers the more modulair
>and 'rom' efficient things will get. This is the big advantage of using
>function pointers.
>  
>
Excellent! :)

Gerrrrrrrr