PWM at 25kHz + Frequency counter | Arduino Compatible Compiler for LabVIEW Discussions | Forum

Hi

I’m working on a setup using a Ardoino uno and a i2C display

The plan is to measure a frequency up to 300Hz and display the frequency on the LCD

At the same time I need to generate a 25Khz PWM signal (adjustable from 0-100%) and show the PWM % on the LCD

I already have this setup to work with the LINX / Arduino but would like a standalone system without a PC.

But how do I do this with the Arduino Compatible Compiler for LabVIEW?

This is the code I’m using to generate a 25Khz PWM:

// PWM output @ 25 kHz, only on pins 9 and 10.

// Output value should be between 0 and 320, inclusive.

void analogWrite25k(int pin, int value)

{

   switch (pin) {

       case 9:

           OCR1A = value;

           break;

       case 10:

           OCR1B = value;

           break;

       default:

           // no other pin will work

           break;

   }

}

void setup()

{

   // Configure Timer 1 for PWM @ 25 kHz.

   TCCR1A = 0;           // undo the configuration done by...

   TCCR1B = 0;           // ...the Arduino core library

   TCNT1 = 0;           // reset timer

   TCCR1A = _BV(COM1A1) // non-inverted PWM on ch. A

           | _BV(COM1B1) // same on ch; B

           | _BV(WGM11); // mode 10: ph. correct PWM, TOP = ICR1

   TCCR1B = _BV(WGM13)   // ditto

           | _BV(CS10);   // prescaler = 1

   ICR1   = 320;         // TOP = 320

   // Set the PWM pins as output.

   pinMode( 9, OUTPUT);

   pinMode(10, OUTPUT);

}

void loop()

{

   // Just an example:

   analogWrite25k( 9, 110);

   analogWrite25k(10, 210);

   for (;;) ; // infinite loop

}