Re: [Gumstix-users] Low watts on robostix port c

[mike2323 <mmi...@gm...>]

Dave Hylands wrote:
> 
> Hi Mike,
> 
>> I am a software guy, but I am working on a project that involves a
>> robostix.
>> The problem I'm having is that when I connect G and V with an LED on any
>> of
>> the port c outputs, it's dim.  I only get 1.5 volts and .05mA.  Without
>> the
>> LED, I'm getting 4.959 volts.  Is there something that I can do to get
>> more
>> watts on the pin?
> 
> Do you have a current limiting resistor on the pin?
> No
> 
> Are you powering the robostix? (i.e. providing power to the power jack
> on the robostix board itself)?
> Yes
> 
> Did you configure the port as an output? By default they're all inputs.
> I thinks so.  i2c-io 0x0b getdir c.0 returns out
> 
> If you just wrote to the PORTC register to set the value, then all
> you've done is to enable the weak internal pullup resistor, which
> would explain the dim LED.
> 
> You also need to write to the DDRC register to configure each pin as
> an input or output. 0 = input, 1 = output.
> How would I do this?
> 
> -- 
> Dave Hylands
> Shuswap, BC, Canada
> http://www.DaveHylands.com/
> 
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