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#!/usr/bin/env python3
import time
import hal

h = hal.component("interval")
h.newpin("enable", hal.HAL_BIT, hal.HAL_IN) # HIGH enables the interval timer
h.newpin("reset", hal.HAL_BIT, hal.HAL_IN) # On change LOW->HIGH restarts the interval
h.newpin("start-with-pulse", hal.HAL_BIT, hal.HAL_IN) # If TRUE the interval starts with a pulse
h.newpin("out", hal.HAL_BIT, hal.HAL_OUT) # Output of the the interval timer, LOW if 'enable' is LOW
h.newpin("delay-time", hal.HAL_FLOAT, hal.HAL_IN) # Interval low time in milliseconds
h.newpin("pulse-time", hal.HAL_FLOAT, hal.HAL_IN) # Interval high time in milliseconds
h.newpin("time-elapsed", hal.HAL_FLOAT, hal.HAL_OUT) # Elapsed low/high time in milliseconds
h.ready()

running = False
reset = False

try:
    while 1:
        if h['enable']:
            delay_time = h['delay-time']
            pulse_time = h['pulse-time']
            if not h['reset']: reset = False
            if h['reset'] and not reset:
                running = False
                reset = True
            if not running:
                timer = round(time.time()*1000)
                running = True
                h['out'] = h['start-with-pulse']
            else:
                h['time-elapsed'] = round(time.time()*1000) - timer
            if not h['out'] and round(time.time()*1000) >= timer + delay_time:
                h['out'] = True
                timer = round(time.time()*1000)
            if h['out'] and round(time.time()*1000)  >= timer + pulse_time:
                h['out'] = False
                timer = round(time.time()*1000)
        else:
            h['out'] = False
            h['time-elapsed'] = 0
            running = False

except KeyboardInterrupt:
    raise SystemExit

HALCMD = loadusr -W ./interval.py
HALCMD = setp interval.delay-time 2000
HALCMD = setp interval.pulse-time 500