avr atmel1284 unprogrammable since today.

Using Arduino Microcontrollers
#1

so this is what is happening: yesterday i succeded in programming my atmel1284p using the arduino as a ISP. but today i cant program it anymore. i can still upload a blink program to the arduino, and the atmel1284 still runs the program i have burned yesterday, but today i cant program it. always get the not sync resp 0x00 or respo 0xe0.

i dont know what had happened. i was using the mosi miso sck and reset ports of 1284 ports to receive the program from arduino. the program i have uploaded all the ports to output (DDRB = 0xff) and set them as active (PORTB=0xff). Is this why i cant program it? because MOSI MISO and SCK are located on port B.5 B.6 and B.7.

thank you for your help

#2

What your program does to any pins won't affect programming. It's more likely you changed a fuse.

Did you manage to program the chip more than once yesterday, or only a single time?

Rob

#3

I get the not sync error when I don't specify the baud rate in avrdude. -b 19200 seems to work; is it possible you've changed a programming option?

#4