VB Timer Fun

void timer_handler()
{
    //if(precise_timer_on)
    //{
    precise_timer_int_cnt++;
    //}

    /* Run one frame of sound driver here. */

    /* VB manual recommends this. */
    HW_REGS[TCR] &= ~TIMER_INT;
    HW_REGS[TCR] |= TIMER_ZCLR;
    HW_REGS[TCR] |= TIMER_INT;
}

void init_timer_hw()
{
    /* Timer interrupt will fire once every 10ms. */
    HW_REGS[TLR] = 0;
    HW_REGS[TLR] = TIME_MS(10);
    HW_REGS[TCR] =  TIMER_100US | TIMER_INT | TIMER_ENB;
}

//In another file...

extern unsigned char precise_timer_int_cnt;
void fade_and_wait()
{
    vbFXFadeIn(3);
    while(!vbPadKeyDown())
    {
        (* (short *)(BGMap(0) + 27)) = (short) precise_timer_int_cnt;
    }
    vbFXFadeOut(3);
}