Go Down

Topic: Uno w/ '328P-PU upload problem (Read 1 time) previous topic - next topic


I am using an Uno with atmega328P-PU on windows 7. Every time I try to upload I always get exactly the same error message (even on 2 different computers I've tried, both windows 7). This is the error message:

avrdude: verification error, first mismatch at byte 0x0000
         0x0c != 0x00
avrdude: verification error; content mismatch

I have seen similar messages but none exactly the same, any help would be most welcome. Also I am fairly certain the bootloader is functional, as pressing the reset button causes the pin13 LED to blink. Power is fine (pwr LED on, using USB), and I am running it off the board so hopefully there aren't any circuitry problems. Strangely the board worked fine before, although in between working and breaking I put it on breadboard and tried to use Serial.read(). This shouldn't have effected it power was regulated 5V and also there is no serial traffic before uploading. The chip can't be burnt out as the reset LED blink still works, it seems to be a problem with uploading only. There doesn't seem to be a program running on the board either.

additional info:
board: Uno
chip: 328P-PU
OS: windows 7
IDE: 0022
Code: "blink" example for testing
COM port: 5
Drivers installed: yes (0022)

Thank you to anyone who can help.


Hi, do theRx and Tx leds blink when you try to upload?

You could try unplugging the chip - check the pins are straight and plug it back in.

Also try updating the driver with the one supplied with 0022.

Hope this helps

http://www.uk-pcb.co.uk - My UK Based PCB Fab & Assembly Company
Design & Assembly work undertaken


Hi, yes they do blink, the chip is in the chip holder properly aswell.
I just tried updating the driver although I did get the same error message, also in device manager the baud rate was listed as 9600 (arduino operates off 115200?) so I changed that, yet there seemed to be no effect.

Thanks anyway.


Can you post the verbose output of an upload?  (Hold shift while clicking the upload button.) 

Are you sure the chip is seated properly in the socket? 


just occured to me - is the chip in the correct way round?
http://www.uk-pcb.co.uk - My UK Based PCB Fab & Assembly Company
Design & Assembly work undertaken


Make sure you have to correct board selected in the arduino software.

Go Up

Please enter a valid email to subscribe

Confirm your email address

We need to confirm your email address.
To complete the subscription, please click the link in the email we just sent you.

Thank you for subscribing!

via Egeo 16
Torino, 10131