PJ, thanks for always trying my sketches.
As shown in the table in post #30, my patch in post #1 is valid for v2.7.2 to v2.9.0 to get analogRead() and a green LED(LEDG) working, and for v2.9.1,need to replace “variant.cpp” and “pins_arduino.h” with my modified files.
Unfortunately, I have posted some problems to “GitHub - Seeed-Studio/ArduinoCore-mbed” issues so far with no response.
I only hope that Seeed engineers will consider my modified files and v2.9.2 will be officially update.