Hello forum,
As the title mentions I strangely lost the function to load an Arduino UNO by the USB interface.
My system is Archlinux and I've planned to make a board with the only ATmega328P, so I'll get the power saving to the most. The project should run with the full swing oscillator, but I still not able to decipher the correct meaning of the fuses.
I reloaded one program with the bootloader, by the means of an universal programmer like the TL886A. The only problems comes with the fuse programming, which I'm unsure what was the Arduino default.
So actually I'm using 0xd6 for the hfuse, the remaining fuses I left at 0xff. When I plug the USB the LED blinks 3~4 times, then it remains still. Trying to program anything the arduino-cli (avrdude) will stuck and I've to kill the task.
My suspect is that the booatloader gets overwritten at the first boot.
That should be OK.
When I plug the USB the LED blinks 3~4 times, then it remains still. Trying to program anything the arduino-cli (avrdude) will stuck and I've to kill the task.
Do you have the auto-reset circuitry? Does the LED blink when you click your "upload" button?
Without the auto-reset circuitry, the first upload will work OK because the "application" is essentially a bunch of 0xFFFF instructions that run off the end (where the bootloader is.)
Does the LED blink when you click your "upload" button?
I can't even reach such point, the blinking is too short for starting even the upload.
Besides that I use a non graphic environment, so to start the uploading I have to give the ENTER to the command line.
Do you have the auto-reset circuitry?
What's that, the board is a normal Arduino with all the bells & whistles. 
No, I'm not talking about uploading the Blink sketch. The LED should do it's 3 "rapid" blinks whenever the bootloader starts, and that SHOULD happen (in hardware) whenever you click the "upload" button, even if everything fails thereafter.
Thank you, westfw, for your support.
The "three blinks" are happening, but then the LED got still ON. But the news are that today I could write the sketch. What that made it possible is very mysterious.
So, after a couple of days without supplying the board , I saw the "three blinks" and then the LED gone OFF upon I plugged the USB. Avrdude didn't take much and started to write the sketch and completed.
arduino-cli upload -b arduino:avr:nano -p /dev/ttyACM0 -v -i $(find /tmp/ -iname Ard*ino.hex 2>/dev/null)
"/home/user/.arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17/bin/avrdude" "-C/home/user/.arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17/etc/avrdude.conf" -v -V -patmega328p -carduino "-P/dev/ttyACM0" -b115200 -D "-Uflash:w:/tmp/arduino-sketch-6222F5FA7B6D3EAD75314B45B3A5EB03/ArduMeasure.ino.hex:i"
avrdude: Version 6.3-20190619
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2014 Joerg Wunsch
System wide configuration file is "/home/user/.arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17/etc/avrdude.conf"
User configuration file is "/home/user/.avrduderc"
User configuration file does not exist or is not a regular file, skipping
Using Port : /dev/ttyACM0
Using Programmer : arduino
Overriding Baud Rate : 115200
AVR Part : ATmega328P
Chip Erase delay : 9000 us
PAGEL : PD7
BS2 : PC2
RESET disposition : dedicated
RETRY pulse : SCK
serial program mode : yes
parallel program mode : yes
Timeout : 200
StabDelay : 100
CmdexeDelay : 25
SyncLoops : 32
ByteDelay : 0
PollIndex : 3
PollValue : 0x53
Memory Detail :
Block Poll Page Polled
Memory Type Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack
----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
eeprom 65 20 4 0 no 1024 4 0 3600 3600 0xff 0xff
flash 65 6 128 0 yes 32768 128 256 4500 4500 0xff 0xff
lfuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
hfuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
efuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
lock 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
calibration 0 0 0 0 no 1 0 0 0 0 0x00 0x00
signature 0 0 0 0 no 3 0 0 0 0 0x00 0x00
Programmer Type : Arduino
Description : Arduino
Hardware Version: 3
Firmware Version: 4.4
Vtarget : 0.3 V
Varef : 0.3 V
Oscillator : 28.800 kHz
SCK period : 3.3 us
avrdude: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.00s
avrdude: Device signature = 0x1e950f (probably m328p)
avrdude: reading input file "/tmp/arduino-sketch-6222F5FA7B6D3EAD75314B45B3A5EB03/ArduMeasure.ino.hex"
avrdude: writing flash (11366 bytes):
Writing | ################################################## | 100% 1.82s
avrdude: 11366 bytes of flash written
So I would like to read the entire memory and see whether the commands got the fuses to default settings. But I doubt they got modified.
I still have to investigate what would be the cause and how to fix it.
For the standalone MCU I'd need to understand what should I put on the flash to make my program working. I presume that programming by the universal programmer the bootloader isn't strictly necessary. But I would like to know the fuses influence on a ATMega328 with a quartz. Maybe I have to change the oscillator for a full swing.
Yeah, I mean that I still have a doubt that the sketch is working when I uploaded by the TL886A.
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