Cannot flash mega16/stk500

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#1
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Hi!

First post here, I'll be pretty straight forward.

I have been playing around with the mega16 a while now. Most recently i tried to get PWM working. I thought i was pretty close to working code so i decided to test run to see if what happened.

I flashed to software to the chip (avrdude with a stk500 board), here's what happened:

PD6 is lit, slightly dimmed.
PD5 is lit, bright.
PD3 is not lit, when i press reset is lit (very faint).

Now i cannot flash the chip anymore.

Avrdude tells me:

avrdude: stk500v2_command(): command failed
avrdude: initialization failed, rc=-1
         Double check connections and try again, or use -F to override
         this check.

AVRStudio4 can read the id of the card but i cannot erase it.

Here's the code:

...
	// Set up the pins as output
	DDRD |= (1 << PD5); 						// OC1A
	DDRD |= (1 << PD4); 						// OC1B
	
	ICR1 = 20000; 								// Set the resolution to 20000 (overflows every 20ms)
	
	OCR1A = 1500;
	OCR1B = 1500;
	
	TCCR1A |= (1 << COM1A1)|(1 << COM1A0); 	// Inverted Compare Output Mode
	TCCR1A |= 14; 								// WGMode 14: Fast PWM using ICR1 as TOP
	TCCR1B |= (1 << CS10); 						// No Prescaling (1MHz)
	TCCR1B |= 14;								// WGMode 14: Fast PWM using ICR1 as TOP
...

Any suggestions?

edit:
When i run avrdude with -tuF i get:

avrdude: Device signature = 0xffffff
avrdude: Yikes!  Invalid device signature.
avrdude: Expected signature for ATMEGA16 is 1E 94 03
avrdude> 

-Simon

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Total votes: 0

Why in the world are you using Avrdude when you have a STK500 and Studio? Looks like you have messed up your fuses.

John Samperi

Ampertronics Pty. Ltd.

www.ampertronics.com.au

* Electronic Design * Custom Products * Contract Assembly