Software Crestron SIMPL+



User-Defined Functions

The term checksum byte is

commonly used in serial

communications to represent

a byte (or bytes) that is

appended to a command

string. This byte is calculated

rom the other characters in

the string using some

specified algorithm.

Checksum bytes are used to

rovide erro

-checking when

communicating between

devices.

In programming, it is common to reuse the same code over and over again. For

example, when writing a program to generate strings (to control a device), there may

be a need to calculate a checksum byte. Once the code to calculate this byte is

formulated, paste it in to the program after each instance where a command string is

created.

This technique has many flaws. First, the program can grow unnecessarily large and

become hard to manage and debug. Second, if there is a need to change the code, it

must be changed every place it was used, which is time consuming and error prone.

The solution is to create user-defined functions to perform common tasks. A user-

defined function is very similar to a “built-in” function like Date or MakeString,

with some important exceptions.

To invoke a user-defined function, use the following syntax:

CALL MyUserFunction();

Event Functions

Event functions make up the heart of most SIMPL+ programs. Since a well-designed

control system is “event-driven” in nature, most code is activated in response to

certain events when they occur. Event functions allow the user to execute code in

response to some change that has occurred to one or more of the input signals

feeding the SIMPL+ module from the SIMPL program.

Two things must be realized about event functions. They can be used with input

variables only (not with locally defined variables). Also, they are only triggered by

the operating system at the appropriate time (that is, they cannot be called manually

by the programmer).

Like everything else in the control system, event functions are multi-tasking. That is,

an event can be triggered even if another event in the same SIMPL+ module is

already processing. As described in “Understanding Processing Order” on page 49,

this only happens if events are triggered on the same logic wave, or if one event

function has caused a task switch.

The structure of an event function is as follows.

event_type <input list>

{

}

In SIMPL+ there are three basic event types that can occur: PUSH, RELEASE, and

CHANGE. In addition to these three is a fourth type simply called "EVENT." These

event types are discussed in the following subsections.

PUSH and RELEASE Events

Push and release events are valid only for DIGITAL_INPUT variables. The push

event is triggered when the corresponding digital input goes from a low to a high

state (positive- or rising-edge). The release event occurs when the signal goes from a

high to a low (negative- or falling-edge). For example, the following code sends a

string to a camera unit to pan left when the left button is pressed and then send a stop

command when the button is released.

10 • SIMPL+



Programming Guide – DOC. 5789A

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 59 60

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Finding Information

Important safety instructions

Electrical information

Feature Overview

Installation

Removing the Doors

Installing Door Handles

Connecting the Water Supply

Controls

Signal Arm

Storage Features

Lower Basket

Ideas for storing foods

Ideas for saving energy

Normal Operating Sounds

Water ﬁlter

Two Clicks

Care and Cleaning

Common Solutions for Concerns

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