Blink works with Arduino IDE +AVRDude but not with Atmel Studio7 +AVRDude

Using Arduino Avrdude, stk500, Bootloader issues
1

Hi, I'm new here.
I started writing asm in 1968 and I've been doing it occasionally since then. Did a lot with Pascal/ Modula2 but not much for 20 years. Cis new to me.

I've got a project working that needs the speed and consistency of assembler. I also found a book (Arduino Inline Assembly by James Eli) that is written at a level that doesn't befuddle me.

My problem is that sketches that work with with the Arduino IDE and load through AVRDude work, but the same thing through Atmel studio 7 and pointing towards the same AVRDude folder appears to work, good messages etc, the RX/TX LEDs flicker on the Nano, but it keeps the previous upload and ignores the one that it should be running. - Easy enough to see as the test programs (sorry, sketches) are identical apart from the speed of blinking.

I suspect a configuration file somewhere but there are gigabytes of Studio and its rather bewildering.

Help!

2

Solved it!

Trawling through the verbose code produced by both the Atmel Studio and Arduino IDE versions of AVRDude I noticed that Arduino (the working version) had put its own version of the 'System wide configuration file' avrdude.conf , not where the program is run from:

C:\Program Files (x86)\Arduino\hardware\tools\avr\etc\avrdude.conf

but from a personal folder:

C:\Users\Ian\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino9/etc/avrdude.conf

Pointing Atmel Studio at this latter file solved my problem!

On to the next insoluble problem!

Baldi