static void
ow_timer_init(void)
{
timer1_mode_normal();
timer1_clock_off();
timer1_count_set(0);
timer1_compare_a_set(0xffff);
timer1_interrupt_a_enable();
}
static void
ow_delay_us(uint16_t usec)
{
timer1_count_set(0);
/* d8 with 16 MHz -> 0.5 usec resolution. */
/* Thus max. wait 65535*0.5usec = 32.768 msec */
timer1_compare_a_set(2*usec);
timer1_clock_d8();
}
static void
ow_delay_ms(uint16_t msec)
{
/* For now, assume the timer is already stopped. */
timer1_count_set(0);
/* d1024 with 16 MHz -> 64 usec resolution. */
/* Thus max. wait 65535*64usec = 4.194 sec */
timer1_compare_a_set(((uint32_t)msec*1000 + 63)/64);
timer1_clock_d1024();
}
/*
* triggered when the clock signal goes high
*/
pin2_interrupt()
{
if (pin_is_high(PIN_DATA))
value |= 1 << (7 - clk);
clk++;
timer1_clock_reset();
timer1_count_set(0);
second = 0;
if (clk == 8) {
if (cnt < 255) {
data[cnt] = value;
cnt++;
events |= EV_DATA;
}
clk = 0;
value = 0;
}
}