Re: [Gumstix-users] I2C Strangeness; modules exist, but no pin activity

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

Hi Adam,

> I began to think that might have been an issue, so no; in the last
> test I did to confirm that what I was saying was correct, I pulled the
> programmer out before testing the pins.  I had been doing that in the
> past, though.

OK - I reprogrammed my 28 pin DIP ATMega8 using the
i2c-Boot-m8-8MHz.hex  file from
http://www.davehylands.com/gumstix-wiki/ATMega8/

Pin 18 (which is PB4/MISO) flashes twice per second.

My LED is connected up like this:


PB4 ------/\/\/\/\-----|>|----- Gnd

using a 470 ohm resistor. To test your LED, connect the resistor to +5
to verify that it lights.

Do you have all of the power and grounds connected on the ATMega8?

Mine has pins 8 and 22 going to groound, and pins 7, and 20 going to +5.

All of the remaining pins are unconnected (except for PB4 to the LED).

My fuses are set with hfuse being 0xD8 and lfuse being 0xE4, which is
appropriate for using the 8 MHz internal oscillator.

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