In the “Tools” menu, open the “Port” sub-menu and select the substitute serial port.In the “Tools” menu, open the “Board” sub-menu and select “Pololu A-Star 32U4”.Connect the 32U4 device to your computer via USB.A non-USB serial port such as /dev/ttyS0 on a Raspberry Pi.A USB-to-serial adapter such as the CP2102N.Here are some examples of substitute serial port devices:
It should also be a device that will not cause any problems if it receives data from the Arduino IDE.
#ARDUINO IDEA PORT GRAYED OUT SOFTWARE#
This should be a device that is recognized by the Arduino IDE as a serial port, but it should not be an A-Star 32U4, Arduino Leonardo, Arduino Micro, or any other device that disappears and reappears as a new device when a piece of software like the Arduino IDE opens the port, sets the baud rate to 1200, and then closes the port. Connect a substitute serial port device to your computer.This method has been tested on Arduino 1.8.19 and Arduino 2.0.3 but requires extra hardware. Looking at the LED and looking at the verbose output during the following procedures will help you understand what is going on. Also, we recommend enabling verbose output during upload using the Arduino IDE’s “Preferences” dialog.
It is useful to look at this LED so you can know what mode the microcontroller is in. In bootloader mode, the yellow LED (the one labeled LED 13) fades in and out. To revive the device, you need to make sure you start sending it programming commands before the 8-second period is over. The bootloader will exit after 8 seconds and try to run the sketch again if it has not started receiving programming commands. Resetting the board twice within 750 ms makes the board go into bootloader mode. Alternatively, you can use a wire to temporarily connect GND and RST together instead of using a reset button. Other boards in our 32U4 family have a reset button you can use. If you have an A-Star 32U4 Micro, you should connect a momentary pushbutton between the GND and RST pins to serve as a reset button. This section explains three special methods for programming an A-Star (or another of our 32U4 family of boards) using the Arduino IDE in case your usual method of programming is not working.
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