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RPBASIC-52 PROGRAMMING GUIDE

2-91

PWM

Syntax: PWM line, ltime,htime[,cycles]

Where: line = 0 to 8 or 100 to 123. This is card dependent. Refer to yo ur hardware m anual.

ltime = 0 to 255, number of 5 ms periods line is low

htime = 0 to 255, number of 5 ms periods line is high

cycles = 0 to 65535, optional number of pulse cycles

Function: Produces pulse width m odulated output.

Mode: Command, Run

Use: PWM 8,3,B,5000

Cards: All

DESCRIPTION

Any digital I/O lines may output a Pulse W idth Modu lated signal. Pulses c an run indefinitely or for a specific

number of times. PWM may be used to control the brightness of a display or send a number of pulses to a

motion controller.

WARNING: PWM continues to run in the command mode.

Low and high times are referenced from unbuffered outputs. Outputs from high current lines are inverted, so

high and low times are reversed.

cycles refer to the number of low to high transitions from an unbuffered outpu t. When a PWM output is

finished counting, that line goes and remains high.

A PW M output is shutoff the quickest by specifying 1 for htime, ltime, and cycles. This can be done as part of

a program or in the immediate mode.

CONFIG LINE

ERRORS

BAD SYNTAX If any parameters left out.

BAD ARGUMENT When any parameters are out of range.

EXAMPLE

The following example sets outputs a PWM signal to line 7. Line 7 is configured for an output on power-up.

PWM 7,2,1

1 2 ... 105 106 107 108 109 110 111 112 113 114 115 ... 162 163

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Remote-processing BASIC 52 Manuale Utente Pagina 110