Re: [Gumstix-users] i2c-io?

[Dave H. <dhy...@gm...>]

Hi Justin,

On Jan 29, 2008 5:21 PM, Justin Rajewski <ju...@ra...> wrote:
>
> I have a H-brige driver on portc pins 0-4. I need to set pin 4 to enable the
> driver and set pin 0 and 2 to 5v and pin 1 and 3 to 0v.
> I have used PIC microcontrllers but never Atmel.
> To do this I would need to set all pins on portc to output with
> i2c-io 0x0b setdir c.x 0
> is that right?

On the AVR 0=in, and 1=out. It's easier to do:

i2c-io 0x0b setdir c.0 out
i2c-io 0x0b setdir c.1 out
i2c-io 0x0b setdir c.2 out
i2c-io 0x0b setdir c.3 out
i2c-io 0x0b setdir c.4 out

Alternatively, you could set pins 0-4 as output and 5-7 as input by doing:

i2c-io 0x0b set DDRC 0x1F

> Then I can set the pin state with
> i2c-io 0x0b set c.x x
> correct?

Yeah - once the pin is set as output. Then this will toggle that particular pin.

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/