Uploading problem with Arduina Mega 2560

Using Arduino IDE 1.x
1

I have a sketch consisting of four files. If I verify/compile this sketch and then attempt to upload it to the Mega, the upload does not successful complete. It indicates "Uploading..." and has a message indicating "Binary sketch size12,082 bytes (of a 258,048 byte maximum). But the upload does not complete successfully. The green progress bar is stuck at about the 90% area.

Can anybody offer any solutions on how to successfully complete this upload?

Also, I checked the FAQ's and found the following:

Why does the Arduino software freeze when I try to upload a program? (on Windows)?

This might be caused by a conflict with the Logitech process 'LVPrcSrv.exe'. Open the Task Manager and see if this program is running, and if so, kill it before attempting the upload. more information

I verified that LVPrcSrv.exe is not running.

Update:
After letting the Arduino software stay in this "Uploading" mode for more than five minutes, I get the following message:

avrDude: stk500v2_ReceiveMessage(): timeout

Not sure what this message means.

Update1:
Just updated the COM port driver for the Arduino from the Arduino 1.06 folder. This did not resolve the problem.

2

Do you have the proper board selected in the IDE config. I have seen similar things when I had UNO selected and tried to update to a non uno board.

Highflier

3

Does your code happen to have !!! anywhere in it? For example:

Serial.println ("Error!!!");
4

Thanx Nick!!! That solved my problem. I had too many exclamation marks in one of my statements. Removed the exclamation marks and all is well. Thanx again!

5

There is a bootloader that fixes that issue, but for now try to restrain your enthusiasm for !!!

6

You may find other useful tips there.