Timer1 Arduino board by Arduino Language (CPP) output signal of period 18 ms from pin 10

gistfile1.txt

#include <Arduino.h>

#define signal_generator_loop_timer_16us 57 // every 16*57 = 912 generate four signals of four pins (one step of helf step driver control)

#define timer_test_output_pin 10

void timer_init();
uint8_t timer_buffer_loop = 0;

void setup(){
  pinMode(timer_test_output_pin, OUTPUT);
  timer_init();
}

ISR(TIMER1_COMPA_vect){          // timer compare interrupt service routine
timer_buffer_loop++;
if(timer_buffer_loop==signal_generator_loop_timer_16us){
  timer_buffer_loop=0;
  digitalWrite(timer_test_output_pin, digitalRead(timer_test_output_pin) ^ 1);   // toggle LED pin
}
  
}

void loop(){
  // your program here…
}

void timer_init(){
    // initialize timer1 
  noInterrupts();           // disable all interrupts
  TCCR1A = 0;
  TCCR1B = 0;
  TCNT1  = 0;
  OCR1A = 256;            // compare match register 
                            // 16MHz/1 = 16MHz
                            // 1/16MHz = 0.0000000625 s 
                            // 0.0000000625 * 256 = 0.000016 s = 16 us
  TCCR1B |= (1 << WGM12);   // CTC mode
  TCCR1B |= (1 << CS10);    // no prescaling (clk/1)
  TIMSK1 |= (1 << OCIE1A);  // enable timer compare interrupt
  interrupts();             // enable all interrupts
}