How can I program my Pro Mini using the native RS232 Serial port on my Mainboard (aka com1).
Google-ing did not really help and a quick search here for "pro mini programming com1" did not deliver any results.
I already have a MAX232 module connected between the Pro Mini and the PC.
I have already tested the com1 port for function by sending stuff to an Arduino mega via its usb-to-serial port and echo-ing that to com1.
Which succeeded (at least sort-of [receiving some random clutter in between characters or missing some characters at all])
I did try the obvious (i.e. selecting pro mini from the board menu and then selecting the com1 port and hit upload).
But that did just produce a timeout-error…
An Option to set the programmer to simple Serial Connection or something similar does not exist to my knowledge (well it does but only if we're talking about STM32 based boards like the blue pill).