I am in the middle of building my own PCB Board with different kind of MCUs (ESP32/8266, ARM Cortex, W5500) - Because each of these in a Dev Board are to big I want to just get the chips onto the board itself and make everything how I want it to be connected.
But I only worked with dev boards before and programming/testing these is really simple but I realised I am really just a beginner in this field and so I don't know how I would get the code for the chips I created on the dev board onto the finished PCB. The only way I could say would build the code on a dev board, remove the chip and but it onto the PCB but if there is any kind of code problem I would really run into a pain to always remove the board. The other alternative I thought of would be to put a USB port - Because I don't want 3 USB ports for each chip I would also build in a jumper to change which chip I want to program.
But I doubt that these are the "best" methods, so could help me there and give me an idea how I would do that ? I know helping a beginner isn't easy but I need to start somewhere to get better. Thanks !