User Manual

MCP Series

Brushed DC Motor Controllers

MCP Series User Manual

178

RETURN

Syntax

return {DataResult}

• DataResult - an optional value to return to the gosub statement, that can be an expression,

constant or variable.

Description

GOSUB stores the address of the next command on the stack and jumps to the specied label.

After executing the code at the jump label a RETURN command is used to remove, from the

stack, the address stored by GOSUB and then jumps to that address.

Notes

Subroutines must exit via the RETURN command, which clears the saved address from the

stack and returns to the command following the GOSUB. User dened arguments must match

the number of arguments dened at the subroutine. If they do not match, a stack overow or

underow will happen. If a subroutine returns a value, the GOSUB is not required to use it or

specify a return value variable.

Example

The result will be 110. The GOSUB command has two arguments and includes a DataResult

variable. The values 10 and 100 are passed to the subroutine MyAdd. The values are then loaded

into the variables arg1 and arg2. RETURN can have an expression, so the variables arg1 and

arg2 are added and returned to the variable result.

Result var long

Main

Gosub myadd[10,100],result

puts 0,[“Result =”,dec result]

End

Arg1 var long

Arg2 var long

MyAdd [arg1,arg2]

Return arg1+arg2