time.c

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#include <eZ8.h>             // special encore constants, macros and flash routines
#include <sio.h>             // special encore serial i/o routines
#include "time.h"
#include "ansi.h"

volatile unsigned long delayTimer, mscounter;

void initTimers() { // Initialize Timer1 to interrupt every 1ms
    DI(); // Disable interrupt

    T1CTL = 0; // TEN - disable timer
    T1CTL |= PRE1; // PRES - Prescaler
    T1CTL |= (1 << 0); // TMODE - continuous mode

    T1H = 0;
    T1L = 1;
    
    T1RH = 18432 >> 8; // Interrupt every 1ms
    T1RL = 18432 & 0xFF;

    SET_VECTOR(TIMER1, timer1int); // Enter the timer1int function at each interrupt
    
    // Set timer1 priority to high
    IRQ0ENH |= PRIORITY_TIMER1;
    IRQ0ENL |= PRIORITY_TIMER1;
    
    delayTimer = 0;
    mscounter = 0;

    T1CTL |= (1 << 7); // TEN - enable timer

    EI(); // Enable interrupt
}

unsigned long millis() { // Get the time since program start in ms
    return mscounter;
}

void delay_ms(unsigned long time) { // Delay in ms - this is not that acurate, but good enough for our needs
    delayTimer = time;
    while(delayTimer);
}

#pragma interrupt
void timer1int() { // Interrupt function
    delayTimer--;
    mscounter++;
}