For AmpySynth Rev1 (no buttons on left side, labeled v1.0), omit the hardware revision flag.
For AmpySynth Rev2 (buttons on side, labeled v1.1), ensure that build_flags includes -DAMPYSYNTH_V1_1 in your platformio.ini
We use the CH340 USB to serial IC. Mac comes with drivers, while Windows may need you to install some.
Due to timing issues, you usually have to manually pull IO0 to GND while programming. In Rev2 the top left button can be used for this.
In Rev 1, both the IO0 and IO2 (RGB LED) pins must be pulled to GND when uploading.
This can be a little fiddly, one trick is to connect one end of the crocodile clip to GND (e.g. with rotary encoder shaft), and use the open jaws of the other end to short both IO0 and IO2 at the same time.
Uncomment the line upload_port = 192.168.1.100 and change it to the IP address of your AmpySynth to upload over the network. You can then use the Upload button in PlatformIO to update your AmpySynth.
Once your upload port is set to an IP address, you can upload files to the SPIFFS filesystem using the command platformio run --target uploadfs --environment esp32dev or click "Upload Filesystem Image" in PlatformIO.
Note Don't use the "Upload Filesystem Image OTA" option, as this sends the wrong settings.
To use this LCD module add the flag -DLCD_240_240 to build_flags