MCUdude
Weird issues with ArduinoISP when running from MiniCore
After flashing MiniCore as the bootloader on Uno (clone) and two Nanos (clones) the ArduinoISP sketch stops working on them
However, ArduinoISP sketch works fine on the default Arduino bootloader
I have even tried using https://github.com/adafruit/Adafruit_Learning_System_Guides/blob/main/ArduinoISP/ to see if it would make any difference. It did not. I have tried messing with the settings to no success.
I have tried all possible combinations. ArduinoISP does not want to work on MiniCore devices
I have tried: Target Nano (minicore) - Destination Nano (default); Target Nano (minicore) - Destination Uno (default); Target Uno (minicore) - Destination Leonardo (default);
I can't come with a reasonable explanation for this, and I have failed to troubleshoot the issue myself. I'd appreciate any feedback on this
avrdude version 6.3-2019061 (included in Arduino IDE). macOS Ventura 13.6 (Intel)
avrdude log (ArduinoISP sketch running on MiniCore Uno trying to flash leonardo)
"$HOME/Library/Arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17/bin/avrdude" "-C$HOME/Library/Arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17/etc/avrdude.conf" -v -patmega32u4 -cstk500v1 -P/dev/cu.usbserial-14220 -e -Ulock:w:0x3F:m -Uefuse:w:0xcb:m -Uhfuse:w:0xd8:m -Ulfuse:w:0xff:m
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 "/Users/vanyasem/Library/Arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17/etc/avrdude.conf"
User configuration file is "/Users/vanyasem/.avrduderc"
User configuration file does not exist or is not a regular file, skipping
Using Port : /dev/cu.usbserial-14220
Using Programmer : stk500v1
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0xa0
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x77
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0xa0
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x77
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0xa0
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x77
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0xa0
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x77
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0xa0
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x77
ArduinoISP sketch running on the same Uno with stock bootloader with the same wiring successfully flashes this exact leonardo
Which version of MiniCore have you installed, and have you installed it using the boards manager? I've just released v3.0.0, which replaces Optiboot in favor of the superior Urboot bootloader.
Oops, forgot to mention the most important thing! I am using MiniCore v3.0.0 @MCUdude
I am using MiniCore v3.0.0
Thanks! Did you install the bootloader on the UNO using MiniCore v3.0.0, or did it already have a bootloader (likely Optiboot)?
@MCUdude I have never had any custom bootloader before. MiniCore v3.0.0 was the first custom bootloader that I've installed
I have also tried reverting to the original bootloader (to test if ArduinoISP works - it does), and then flashing MiniCore v3.0.0 again (and ArduinoISP broke)
My time is quite limited, but I'll have a closer look at the issue within a few days. Maybe @stefanrueger (who created the Urboot bootloader) knows why the Urboot bootloader breaks Arduino as ISP?
Urboot bootloaders need
avrdude -c urclockfor programming, which is only available from AVRDUDE v7.0. (v6.3 does not work)- Potentially different fuse settings than optiboot
So, try to figure out which urboot bootloader you have and see whether the fuse settings are correct
I'll compare the fuse settings between stock bootloader and MiniCore and will get back with results
Btw I don't have issues uploading the sketches with -c arduino with avrdude 6.3, which makes me believe that s flag is set for compatibility
what are the flags used for urboot in MiniCore?
the Urboot bootloader is built with these flags/features:
avrdude -c urclock -P /dev/cu.usbmodem14101 -p atmega328p -x showversion
avrdude: AVR device initialized and ready to accept instructions
u7.7 weu-jPrac
I'm not able to reproduce the issue you're seeing though.
I uploaded the ArduinoISP sketch available under File > Examples > 11. ArduinoISP to a genuine Arduino UNO running Urboot. I wired up the UNO to a target board, in my case an Atmega1284P, and connected a capacitor between GND and the RESET pin on the UNO. No issues here...
/Users/hans/Library/Arduino15/packages/MightyCore/tools/avrdude/7.2-arduino.1/bin/avrdude -C/Users/hans/Library/Arduino15/packages/MightyCore/hardware/avr/3.0.0/avrdude.conf -v -patmega1284p -cstk500v1 -P/dev/cu.usbmodem14101 -b19200 -Ueeprom:w:/var/folders/6l/ypg6qbw172v1s4vtt6g990tw0000gn/T/arduino_build_652192/Blink.ino.eep:i -Uflash:w:/var/folders/6l/ypg6qbw172v1s4vtt6g990tw0000gn/T/arduino_build_652192/Blink.ino.hex:i
avrdude: Version 7.2-arduino.1
Copyright the AVRDUDE authors;
see https://github.com/avrdudes/avrdude/blob/main/AUTHORS
System wide configuration file is /Users/hans/Library/Arduino15/packages/MightyCore/hardware/avr/3.0.0/avrdude.conf
User configuration file is /Users/hans/.avrduderc
Using Port : /dev/cu.usbmodem14101
Using Programmer : stk500v1
Overriding Baud Rate : 19200
AVR Part : ATmega1284P
Chip Erase delay : 55000 us
PAGEL : PD7
BS2 : PA0
RESET disposition : possible i/o
RETRY pulse : SCK
Serial program mode : yes
Parallel program mode : yes
Timeout : 200
StabDelay : 100
CmdexeDelay : 25
SyncLoops : 32
PollIndex : 3
PollValue : 0x53
Memory Detail :
Block Poll Page Polled
Memory Type Alias Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack
----------- -------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
eeprom 65 10 128 0 no 4096 8 0 9000 9000 0xff 0xff
flash 65 10 256 0 yes 131072 256 512 4500 4500 0xff 0xff
lfuse 0 0 0 0 no 1 1 0 9000 9000 0x00 0x00
hfuse 0 0 0 0 no 1 1 0 9000 9000 0x00 0x00
efuse 0 0 0 0 no 1 1 0 9000 9000 0x00 0x00
lock 0 0 0 0 no 1 1 0 9000 9000 0x00 0x00
signature 0 0 0 0 no 3 1 0 0 0 0x00 0x00
calibration 0 0 0 0 no 1 1 0 0 0 0x00 0x00
Programmer Type : STK500
Description : Atmel STK500 version 1.x firmware
Hardware Version: 2
Firmware Version: 1.18
Topcard : Unknown
Vtarget : 0.0 V
Varef : 0.0 V
Oscillator : Off
SCK period : 0.1 us
avrdude: AVR device initialized and ready to accept instructions
avrdude: device signature = 0x1e9705 (probably m1284p)
avrdude: Note: flash memory has been specified, an erase cycle will be performed.
To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude: processing -U eeprom:w:/var/folders/6l/ypg6qbw172v1s4vtt6g990tw0000gn/T/arduino_build_652192/Blink.ino.eep:i
avrdude: reading input file /var/folders/6l/ypg6qbw172v1s4vtt6g990tw0000gn/T/arduino_build_652192/Blink.ino.eep for eeprom
with 0 bytes in 0 sections within [0, -1]
using 0 pages and 0 pad bytes
avrdude: writing 0 bytes eeprom ...
Writing | ################################################## | 100% 0.00s
avrdude: 0 bytes of eeprom written
avrdude: verifying eeprom memory against /var/folders/6l/ypg6qbw172v1s4vtt6g990tw0000gn/T/arduino_build_652192/Blink.ino.eep
Reading | ################################################## | 100% 0.00s
avrdude: 0 bytes of eeprom verified
avrdude: processing -U flash:w:/var/folders/6l/ypg6qbw172v1s4vtt6g990tw0000gn/T/arduino_build_652192/Blink.ino.hex:i
avrdude: reading input file /var/folders/6l/ypg6qbw172v1s4vtt6g990tw0000gn/T/arduino_build_652192/Blink.ino.hex for flash
with 1012 bytes in 1 section within [0, 0x3f3]
using 4 pages and 12 pad bytes
avrdude: writing 1012 bytes flash ...
Writing | ################################################## | 100% 1.11s
avrdude: 1012 bytes of flash written
avrdude: verifying flash memory against /var/folders/6l/ypg6qbw172v1s4vtt6g990tw0000gn/T/arduino_build_652192/Blink.ino.hex
Reading | ################################################## | 100% 0.58s
avrdude: 1012 bytes of flash verified
avrdude done. Thank you.