Hi,
I've been working with a TinyDuino on a very simple project. Things were going fine. Using Ardunio IDE 1.8.5, I was able to flash Blink.ino, then wrote a bit of code and flashed that several times as I developed it. One time, I flashed and it worked fine. I made a tiny code change, flashed again, and it failed with: avrdude: verification error; content mismatch. I've tried probably about 100 times, since then, and still get the same error, no matter what I try to flash. Other boards work fine (though I don't have another TinyDuino to try).
Nothing weird about the code and nothing to the hardware except a BLE TinyShield and a proto board that just gave me a push button, at this point. I've removed all hardware except the TinyDuino (obviously) and the USB TinyShield, so as to eliminate any possible cause there. I've also tried several different USB cables and ports. So, that's not the problem.
The full output looks something like:
Arduino: 1.8.5 (Windows 7), Board: "Arduino Pro or Pro Mini, ATmega328P (3.3V, 8 MHz)"
Sketch uses 928 bytes (3%) of program storage space. Maximum is 30720 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes for local variables. Maximum is 2048 bytes.
C:\Users\Me\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino9/bin/avrdude -CC:\Users\Me\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino9/etc/avrdude.conf -v -patmega328p -carduino -PCOM11 -b57600 -D -Uflash:w:C:\Users\Me\AppData\Local\Temp\arduino_build_474044/Blink.ino.hex:i
avrdude: Version 6.3, compiled on Jan 17 2017 at 12:00:53
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2014 Joerg Wunsch
System wide configuration file is "C:\Users\Me\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino9/etc/avrdude.conf"
Using Port : COM11
Using Programmer : arduino
Overriding Baud Rate : 57600
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: 5.0
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\Me\AppData\Local\Temp\arduino_build_474044/Blink.ino.hex"
avrdude: writing flash (928 bytes):
Writing | ################################################## | 100% 0.38s
avrdude: 928 bytes of flash written
avrdude: verifying flash memory against C:\Users\Me\AppData\Local\Temp\arduino_build_474044/Blink.ino.hex:
avrdude: load data flash data from input file C:\Users\Me\AppData\Local\Temp\arduino_build_474044/Blink.ino.hex:
avrdude: input file C:\Users\Me\AppData\Local\Temp\arduino_build_474044/Blink.ino.hex contains 928 bytes
avrdude: reading on-chip flash data:
Reading | ################################################## | 100% 0.43s
avrdude: verifying ...
avrdude: verification error, first mismatch at byte 0x0002
0x00 != 0x5c
avrdude: verification error; content mismatch
avrdude: verification error; content mismatch
avrdude done. Thank you.
I haven't messed with any configurations or the bootloader in any way. Curiously, the following appears intermittently at the very end of the output above: the selected serial port does not exist or your board is not connected
Yet ... the upload works just fine, but the verification fails. Plus, I can open the serial monitor and send data and see the RX light blink on the USB TinyShield. So, it sure seems like the serial port is fine. And, like I said, this comes and goes, and only appears after, "avrdude done. Thank you." No matter what, the program never runs on the device.
At this point, I suspect the board itself is damaged or defective, in some way, but am not sure if there is something I can do to rule this out (or confirm), short of just ordering another board. Any advice?