Backup Arduino Nano Every #1961
Description
Hi,
I've recently encountered an issue, trying to send the reset/touch signal (using 1200 baud) to my Arduino Nano Every in order to backup the binary version of the currently running sketch. After running this command:
/usr/local/bin/avrdude -vv -p atmega4809 -c jtag2updi -r -b 115200 -P /dev/ttyACM0 -U flash:r:board.hex:i
I got the following response:
Avrdude version 8.0-20250311 (8c4b69ac)
Copyright see https://github.com/avrdudes/avrdude/blob/main/AUTHORS
System wide configuration file is /usr/local/etc/avrdude.conf
User configuration file /root/.avrduderc does not exist
Touching serial port /dev/ttyACM0 at 1200 baud
Waiting for new port... using same port /dev/ttyACM0
Using port : /dev/ttyACM0
Using programmer : jtag2updi
Programmer baud rate : 115200
JtagmkII_open_pdi()
JtagmkII_getsync() attempt 1 of 10: sending sign-on command:
Error jtagmkII_recv_frame() jtagmkII.c 575: timeout
Warning jtagmkII_getsync() jtagmkII.c 650: attempt 1 of 10: sign-on command: status -1
JtagmkII_getsync() attempt 2 of 10: sending sign-on command:
Error jtagmkII_recv_frame() jtagmkII.c 575: timeout
Warning jtagmkII_getsync() jtagmkII.c 650: attempt 2 of 10: sign-on command: status -1
JtagmkII_getsync() attempt 3 of 10: sending sign-on command:
Error jtagmkII_recv_frame() jtagmkII.c 575: timeout
Warning jtagmkII_getsync() jtagmkII.c 650: attempt 3 of 10: sign-on command: status -1
JtagmkII_getsync() attempt 4 of 10: sending sign-on command:
Error jtagmkII_recv_frame() jtagmkII.c 575: timeout
Warning jtagmkII_getsync() jtagmkII.c 650: attempt 4 of 10: sign-on command: status -1
JtagmkII_getsync() attempt 5 of 10: sending sign-on command:
Error jtagmkII_recv_frame() jtagmkII.c 575: timeout
Warning jtagmkII_getsync() jtagmkII.c 650: attempt 5 of 10: sign-on command: status -1
JtagmkII_getsync() attempt 6 of 10: sending sign-on command:
Error jtagmkII_recv_frame() jtagmkII.c 575: timeout
Warning jtagmkII_getsync() jtagmkII.c 650: attempt 6 of 10: sign-on command: status -1
JtagmkII_getsync() attempt 7 of 10: sending sign-on command:
Error jtagmkII_recv_frame() jtagmkII.c 575: timeout
Warning jtagmkII_getsync() jtagmkII.c 650: attempt 7 of 10: sign-on command: status -1
JtagmkII_getsync() attempt 8 of 10: sending sign-on command:
Error jtagmkII_recv_frame() jtagmkII.c 575: timeout
Warning jtagmkII_getsync() jtagmkII.c 650: attempt 8 of 10: sign-on command: status -1
JtagmkII_getsync() attempt 9 of 10: sending sign-on command: ^[[A^[[A^C
with a little help from Arduino forum, I've managed to successfully download the hex file to my local computer, using a python script that does that 1200 baud reset a bit different, using a small delay between opening and closing the com channel.
Here's the script, so you can see what helped to put my Arduino Nano Every into UPDI mode properly:
#!/usr/bin/python3
# Based on https://github.com/arduino/ArduinoCore-megaavr/issues/124#issuecomment-1330763422
# Run this script to reset the Arduino Nano Every
# eg. sudo python3 mcu_reset.py
#
# Note: You must install pyserial first; i.e. sudo pip3 pyserial
import serial
import os, sys, time
# total arguments
n = len(sys.argv)
if n >= 2:
port = sys.argv[1]
else:
port = '/dev/ttyACM0'
print("Port: {}".format(port))
#re-enable hupcl temporarily (necessary for arduino reset using serial port)
os.system('sudo /bin/stty -F {} hupcl'.format(port))
try:
#perform Arduino Nano Every reset "handshake"
ser = serial.Serial()
ser.baudrate = 1200
ser.port = port
ser.open()
time.sleep(0.5)
ser.close()
except serial.SerialException:
print("Error: serial.SerialException")
exit()
I've posted this message in hope it could help you perhaps understand what could be improved with the "-r" option of the avrdude (great product btw, thank you a lot for creating it!).
Cheers