For the 4-pins used for JTAG, can they be switched on/off via software or do they require hardware binding? In other words, can they be used for both programing and application software based on an internal mux which can be triggered somehow?

Hi all, can I2C, SPI, and the UART be used at the same time?

I have multiple copies of the framework on Windows 10 computer. One for Mingw32, one for VisualGDB, and one for platformio, and of course the Arduino environment. For some reason, the blink program stopped working. I mean I can compile and upload it to Arduino wroom 32 feather board. But the pin 13 ...

Suddenly I can't get a simple Blink program to work with Command line tool, VisualGDB, or Arduino IDE. The program compiles, and uploads to the board. But the LED doesn't blink. Yesterday it worked just fine. I can program an Arduino UNO fine. I thought that maybe the onboard LED went bad, so I trie...