In: Accounting
Comment on how to use subroutines on the ATMega328P. Comment on the ways of passing parameters, returning results and how the processor manages subroutine calls, possibly recursive calls. Also comment on the role of the stack in the use of subroutines.
Burning the Bootloader
Since the call stack is organized as a stack, the caller pushes the return address onto the stack, and the called subroutine, when it finishes, pulls or pops the return address off the call stack and transfers control to that address.
CALL and RETURN instructions. The CALL instruction interrupts the flow of a program by passing control to an internal or external subroutine. ... An external subroutine is another program. The RETURN instruction returns control from a subroutine back to the calling program and optionally returns a value
A routine or subroutine, also referred to as a function, procedure, and subprogram, is code that may be called and executed anywhere in a program. For example, a routine may be used to save a file or display the time. ... Below is a basic example of a Perl subroutine