Compilation Error on defining IO_E2

[jsmith2021Brandeis]

This library doesn't compile in my Sloeber Application because LEFT_B isn't defined as a constant

[kevin-pololu]

Hi,

The pin constant IO_E2 is defined in the FastGPIO library, and in order for that to happen correctly, the program needs to be compiled with the correct processor specified (here is the line in FastGPIO.h that checks for it). Normally, the processor is specified by passing the -mmcu option to avr-g++ (e.g. -mmcu=atmega32u4).

We haven't used Sloeber and are not familiar with it, but could you check that you don't see any previous errors that indicate that FastGPIO.h is not being included properly, and that the ATmega32U4 microcontroller is correctly selected for your project? Could you copy the full avr-g++ command line from the console output (2 lines above the error you highlighted) so we can see if it includes -mmcu=atmega32u4?