LDmicro, Arduino and PWM

ladder-export.txt

LDmicro export text
for 'ANSI C Code', 4.000000 MHz crystal, 10.0 ms cycle time


LADDER DIAGRAM:

   ||                                                                                                      ||
   || ; Interier Light                                                                                     ||
 1 || ; When you press the button (d2) led (pwm) will turn on and after some time (5 sec) fade out.        ||
   ||                                                                                                      ||
   ||                                                                                                      ||
   ||                                                                                                      ||
   ||                                                                                                      ||
   ||       Xd2                                                                                  Ron       ||
 2 ||-------] [------+---------------------------------------------------------------------------(S)-------||
   ||                |                                                                                     ||
   ||                |                                                                     {pwm  :=     }  ||
   ||                +---------------------------------------------------------------------{ 255     MOV}--||
   ||                                                                                                      ||
   ||                                                                                                      ||
   ||                                                                                                      ||
   ||                                                                                                      ||
   ||       Ron              Ton                                                                Rfade      ||
 3 ||-------] [---------[TON 5.000 s]------------------------------------------------------------( )-------||
   ||                                                                                                      ||
   ||                                                                                                      ||
   ||                                                                                                      ||
   ||                                                                                                      ||
   ||      Rfade            Rstep            Tstep                                 {SUB  pwm  :=}          ||
 4 ||-------] [--------------]/[--------[TON 100.0 ms]-+---------------------------{ pwm - 8    }----------||
   ||                                                  |                                                   ||
   ||                                                  |                                        Rstep      ||
   ||                                                  +-----------------------------------------( )-------||
   ||                                                                                                      ||
   ||                                                                                                      ||
   ||                                                                                                      ||
   ||                                                                                                      ||
   ||      Rfade          [pwm <=]                                                               Ron       ||
 5 ||-------] [-----------[ 0    ]----+----------------------------------------------------------(R)-------||
   ||                                 |                                                                    ||
   ||                                 |                                                    {pwm  :=     }  ||
   ||                                 +----------------------------------------------------{ 0       MOV}--||
   ||                                                                                                      ||
   ||                                                                                                      ||
   ||                                                                                                      ||
   ||------[END]-------------------------------------------------------------------------------------------||
   ||                                                                                                      ||
   ||                                                                                                      ||

pwm.pde

#include "ladder.h"

/* Plc cycle interval, set this according to LDmicro settings. (micro sec.) */ 
#define PLC_INTERVAL 10000

void setup()
{
    PlcSetup();
}

void loop()
{
    if (IsPlcInterval())
    {
        PlcCycle();
        
        // set PWM output
        analogWrite(3, U_i_pwm);
    }
}

/* Plc Cycle timing function. */
boolean IsPlcInterval()
{
    static unsigned long last_run;
    
    if (micros() - last_run >= PLC_INTERVAL)
    {
        last_run = micros();
        return true;
    }
    return false;
}