Accessing an MCU via minicom but it keeps saying Resource Busy
Solution 1:
It seems like you have confused some things:
minicom
is a program that will allow you to communicate with for example a different computer running Linux over a serial connection.
/dev/disk3
is a device node on your computer that refers to a physical block device (i.e. for example a hard drive or an SSD).
It does not make sense to ask minicom
to communicate with an SSD disk. This is why your command fails.
Instead when using minicom
you need to use the device node for a serial communications port. For example it could /dev/cu.usbserial
or similar depending on the type of serial port you have.