User manual
mikroBasic PRO for PIC32
MikroElektronika
197
‘...
main:
if cnt > MAXALLOWED then
cnt = 0
PORT.1 = 0
MYDELAY
end if
Note: Symbols do not support macro expansion in a way the C preprocessor does.
Functions and Procedures
Functions and procedures, collectively referred to as routines, are subprograms (self-contained statement blocks)
which perform a certain task based on a number of input parameters. When executed, a function returns value while
procedure does not.
Functions
A function is declared like this:
sub function function_name(parameter_list) as return_type
[ local declarations ]
function body
end sub
function_name represents a function’s name and can be any valid identier. return_type is a type of return value
and can be any simple type or complex type. Within parentheses, parameter_list is a formal parameter list very
similar to variable declaration. In mikroBasic PRO for PIC, parameters are always passed to a function by the value. To
pass an argument by address, add the keyword byref ahead of identier.
Local declarations are optional declarations of variables and/or constants, local for the given function. Function
body is a sequence of statements to be executed upon calling the function.
Calling a function
A function is called by its name, with actual arguments placed in the same sequence as their matching formal parameters.
The compiler is able to coerce mismatching arguments to the proper type according to implicit conversion rules. Upon
a function call, all formal parameters are created as local objects initialized by values of actual arguments. Upon return
from a function, a temporary object is created in the place of the call and it is initialized by the value of the function
result. This means that function call as an operand in complex expression is treated as the function result.
In standard Basic, a function_name is automatically created local variable that can be used for returning a value of
a function. mikroBasic PRO for PIC32 also allows you to use the automatically created local variable result to assign
the return value of a function if you nd function name to be too ponderous. If the return value of a function is not dened
the compiler will report an error.