I'm automating a configuration process for an embedded board. To enter the setup screen I need to send "Ctrl-C" command.
This is NOT to interrupt a process I'm running locally, KeyboardInterrupt will not work. I need to send a value that will be interpreted by the bootloader as Ctrl-C.
What is the value I need to send?
Thank you
IIRC, Ctrl-C is etx. Thus send \x03.
You should send a character with the ASCII code 3:
serial.write('\x03')
Python doesn't take the ASCII code as a string, it needs to be encoded as bytes. So just add b before the code.
serial.write(b'\x03')
I've used here and saved and saved my life a couple times.
serial.write(b'\x03')
This may not work (or not work all the time) as it depends on the default encoding. If this is NOT utf-8 then pyserial will complain with the message :
TypeError('unicode strings are not supported, please encode to bytes: {!r}'.format(seq))
To avoid this you have to encode your string as utf-8, so to send an escape sequence (e.g. ESC [ z ) you can do:
ESC_CHAR = chr(27)
text=f"{ESC_CHAR}[z".encode("utf-8"
serial.write(text)
You can of course compress this to one line or a variable for convenience.
