arduino mega 2560 using progisp & codevision AVR. fuse bit and uploading problem

[Dhans42]

hello, i have arduino mega 2560 pro here. and my programmer using CodevisionAVR and usbasp(isp).

is there a recommended fuse bit setting for crystal 16MHz?
mega 2560 exsisting : Low=FF, High=D8, Extend=FD. when i upload using ISP. the program upload was success, but the program didnt start.

--- Updated Aug 29, 2024 ---

i use the progisp uploader with spi terminal, is there any special treatment to upload using spi to arduino mega 2560 board?

 

[KlausST]

Hi,

is there a recommended fuse bit setting for crystal 16MHz?

I´m quite sure.
But I can´t remember what setting it is.

But if I need to know this, I´d simply look into the microcontroller´s datasheet.

Klaus

 

[danadakk]

Take care concerning potential bricking of Atmega :

How to Change Fuse Bits of AVR Atmega328p - 8bit Microcontroller Using Arduino

How to Change Fuse Bits of AVR Atmega328p - 8bit Microcontroller Using Arduino: In this instructable you will learn how to change the fuse bits of Atmega328p microcontroller. I am using Arduino mega as a programmer to program Atmega328P-PU on breadboard. It comes with a default 1MHz Internal...

www.instructables.com

Arduino / ATmega 328P fuse settings – Martyn Currey

www.martyncurrey.com

Regards, Dana.

 

[Dhans42]

oh i know the problem. the atmega2560 keep resetting itself. what should i do to disable it? its like a uC supervisori but i didnt find the supervisori as hardware. was anyone meet a problem like this? -board mega 2560 pro-

 

[johnny78]

oh i know the problem. the atmega2560 keep resetting itself. what should i do to disable it? its like a uC supervisori but i didnt find the supervisori as hardware. was anyone meet a problem like this? -board mega 2560 pro-

is it possible the pull up resistor on reset pin is unsoldered ?
or attach a 10k resistor from reset pin to 5v
just 4 test

 

[KlausST]

Hi,

at first you focussed on clock fuse setting.

is there a recommended fuse bit setting for crystal 16MHz?

Now you say it is a resetting problem:

oh i know the problem. the atmega2560 keep resetting itself

* how do you know at all that it is resetting?
* how do you know it is resetting ITSELF?

--> External reset lines can be monitored.
--> During ISP upload the RESET is ACTIVE anyways. I never heard about INTERNAL RESET while external RESET is applied.

I can only imagine that "aborting" during ISP can be caused by unstable power supply.

Klaus

 

[danadakk]

If you use extended delay() in the code the WDT can trigger a reset, so you have to "feed the dog"
depending on what your code and the APIs its using. If I am not mistaken there are libs out there
that take care of this in their implementation. Or code your own delay routine you call which
creates a total delay based on smaller delay/reset the WDT periodically. Or timed interrupt
or.......

Mastering the Arduino Watchdog Timer: A Comprehensive Tutorial - KeyOfTech.com

Unlock the full potential of your Arduino projects with our comprehensive tutorial on mastering the Watchdog Timer. Learn how to enhance reliability and performance today!

www.keyoftech.com

Google "arduino delay wdt" for more info.

Regards, Dana.

 

[Dhans42]

if i erase the flash with ISP, the watchdog should be stopped right?

 

[KlausST]

Hi,

if you erase the FLASH, then no useful code is performed. It does nothing you can "detect" externally.
In my eyes it is impossible to determine whether the microcontroller is in RESET or not.
So why is it of interest then?

And btw: WDT can be forced_enabled by fuses. Thus to be sure the WDT is disabled --> disable the according FUSE.

It´s all described in the datasheet.

Klaus