Hi,
I've uploaded a sketch on the Arduino Uno R3 to flash an LED on pin 13, had a 20Ohm resistor in series with LED, the first upload worked, but every upload after that failed with the below error.
I've tried on multiple computers and operating systems, always get the same error even if I upload a blank sketch.
Could the bootloader be damaged, or does it look more like a faulty unit?
Arduino: 1.8.12 (Windows 10), Board: "Arduino Uno"
Sketch uses 444 bytes (1%) of program storage space. Maximum is 32256 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes for local variables. Maximum is 2048 bytes.
C:\Users\User\Downloads\arduino-1.8.12-windows\arduino-1.8.12\hardware\tools\avr/bin/avrdude -CC:\Users\User\Downloads\arduino-1.8.12-windows\arduino-1.8.12\hardware\tools\avr/etc/avrdude.conf -v -patmega328p -carduino -PCOM6 -b115200 -D -Uflash:w:C:\Users\User\AppData\Local\Temp\arduino_build_286903/sketch_feb24a.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 "C:\Users\User\Downloads\arduino-1.8.12-windows\arduino-1.8.12\hardware\tools\avr/etc/avrdude.conf"
Using Port : COM6
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 "C:\Users\User\AppData\Local\Temp\arduino_build_286903/sketch_feb24a.ino.hex"
avrdude: writing flash (444 bytes):
Writing | ################################################## | 100% 0.08s
avrdude: 444 bytes of flash written
avrdude: verifying flash memory against C:\Users\User\AppData\Local\Temp\arduino_build_286903/sketch_feb24a.ino.hex:
avrdude: load data flash data from input file C:\Users\User\AppData\Local\Temp\arduino_build_286903/sketch_feb24a.ino.hex:
avrdude: input file C:\Users\User\AppData\Local\Temp\arduino_build_286903/sketch_feb24a.ino.hex contains 444 bytes
avrdude: reading on-chip flash data:
Reading | ################################################## | 100% 0.06s
avrdude: verifying ...
avrdude: verification error, first mismatch at byte 0x010f
0x80 != 0x90
avrdude: verification error; content mismatch
avrdude done. Thank you.