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#include <stdio.h>
#include <avr/pgmspace.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include "delay.h"
#include "morse.h"
#define PORTB_PTT (1 << 0)
#define PORTB_LED (1 << 4)
volatile uint8_t Timer; /* Timer (100Hz increment) */
/*---------------------------------------------------------*/
/* 100Hz timer interrupt generated by OC2 */
/*---------------------------------------------------------*/
ISR(TIMER1_COMPA_vect)
{
Timer++;
}
static int inittimer(void)
{
/* Start 100Hz system timer (TC2.OC) */
TCCR0B |= (1 << WGM02); // Configure timer for CTC mode
TIMSK |= (1 << OCIE1A); // enable overflow interrupt
OCR1A = (uint8_t)(F_CPU / 64 / 1000 / 100 - 1); // Set CTC compare value to 10ms
TCCR0B |= ((1 << CS10) | (1 << CS11)); // Start timer at Fcpu/64
// Enable interrupts
sei();
return 0;
}
#define PTT_LOGIC_LOW 0
#if PTT_LOGIC_LOW
void dah(void)
{
PORTB = PORTB_LED; // LED is non-inverted logic
delay_ms(3*DIT_DURATION);
PORTB = PORTB_PTT; // PTT is inverted logic
delay_ms(DIT_DURATION);
}
void dit(void)
{
PORTB = PORTB_LED; // LED is non-inverted logic
delay_ms(DIT_DURATION);
PORTB = PORTB_PTT; // PTT is inverted logic
delay_ms(DIT_DURATION);
}
#else
void dah(void)
{
PORTB = PORTB_PTT | PORTB_LED;
delay_ms(3*DIT_DURATION);
PORTB = 0;
delay_ms(DIT_DURATION);
}
void dit(void)
{
PORTB = PORTB_PTT | PORTB_LED;
delay_ms(DIT_DURATION);
PORTB = 0;
delay_ms(DIT_DURATION);
}
#endif
int main(void)
{
/* Enable PTT output on PB0 */
#if PTT_LOGIC_LOW
PORTB = PORTB_PTT;
#endif
/* LED is never inverted */
DDRB = PORTB_PTT | PORTB_LED;
/* initialise timer interrupt */
inittimer();
delay_ms(12*DIT_DURATION);
morse("HB9EGM");
delay_ms(12*DIT_DURATION);
while (1) {
// morse code !
morse("MOH");
delay_ms(6*DIT_DURATION);
}
return 0;
}
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