Interrupt evry 1/100s

[rradojko]

I have a question.
I use an Arduino UNO and 16 MHz quartz.
I want to create a interruption at every hundredth of a second - interrupt 1/100s.
Which timer should i use? 8-bit timer or 16_bit timer?
How do I configure the timer register?

Thanks for the reply.

[Benj]

Hello,

This should get you pretty close to 100Hz interrupt.

ArdTimerDemo.fcfx

(4.6 KiB) Downloaded 374 times

[rradojko]

Hello,

Thank you Benj for your answer, but interrupt (ArdTimerDemo.fcfx ) is not not accurate.
I checked interrupt with the logic analyzer. See attachment below.

I need exactly interruption. It uses the 16-bit timer and the "C" code, but I do not know how?

[Benj]

Hello,

Something like this might help to get your values right.
http://eleccelerator.com/avr-timer-calculator/

Have a play and let us know how your getting on.

[rradojko]

Hello!

Benj Thanks for the information.
I managed to configure the 16-bit Timer1.
I use the Arduino Uno and processor Atmega328p.

Here are the settings Timer1 to interrupt each 1 / 100s for Arduino. The code works!

Code: Select all

// Arduino timer CTC interrupt example - interrupt evry 1/100s
#include <avr/io.h>
#include <avr/interrupt.h>
 
#define LEDPIN 13
 
void setup()
{
    pinMode(LEDPIN, OUTPUT);
 
    // inicializacija Timer1
    cli();          // disable all interrupts
    TCCR1A = 0;     // TCCR1A register on 0
    TCCR1B = 0;     // TCCR1B on 0
 
    // set compare match register to desired timer count
    OCR1A = 624;
    // turn on CTC mode
    TCCR1B |= (1 << WGM12);
    // prescaler  - 1:256
    TCCR1B |= (1 << CS12);
    // enable timer compare interrupt
    TIMSK1 |= (1 << OCIE1A);
    // enable all interrupts
    sei();
}
 
void loop()
{
    // do some stuff while my LED keeps blinking
}
 
ISR(TIMER1_COMPA_vect)
{
    digitalWrite(LEDPIN, !digitalRead(LEDPIN));   //Flashing LED and frequency control
}

[rradojko]

Here are the settings for the custom interrupt the Flowcode 6. Interrupt evry 1/100s.

[rradojko]

I think it is a mistake to help in Flowcode custom interrupt. Code of help did not work