Echelon I/O Model Reference for Smart Transceivers and Neu Manual de usuario descargar pdf (Pagina 163)

I/O Model Reference 153

Syntax

[input] totalcount [mux | ded] [invert]

io-object-name

;

An I/O pin. Totalcount input can specify pins IO_4 through IO_7.

mux | ded

Specifies whether the I/O object is assigned to the multiplexed or dedicated

timer/counter. This keyword is used only when pin IO_4 is used as the input

pin.

The mux keyword assigns the I/O object to the multiplexed timer/counter.

The ded keyword assigns the I/O object to the dedicated timer/counter. The

multiplexed timer/counter is always used for pins IO_5 through IO_7.

invert

Causes positive edges to be counted. By default, totalcount input counts the

number of negative input edges.

io-object-name

A user-specified name for the I/O object, in the ANSI C format for variable

identifiers.

Usage

unsigned long

input-value

;

input-value

= io_in(

io-object-name

);

Example

IO_4 input totalcount ded ioEventCount;

unsigned long events = 0;

mtimer repeating tick = 100;

when (timer_expires(tick)) {

events += io_in(ioEventCount);

// this sums up all events since initialization-time

}

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Echelon I/O Model Reference for Smart Transceivers and Neu Manual de usuario Pagina 163