uv-belichter-software/programs/timers.py

"""
uv-belichter-software - the TIMER submenu
Copyright (C) 2024  Benjamin Burkhardt

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
"""

from time import sleep, time_ns

# All the arguments this method takes are there for one reason: reduce the amount of libraries loaded into the picos memory and thus improving performance
# config: utils.Config object
# btn_mapping: a dict containing the btn mapping for the menu operation (given to the lcdMenu object)
# log: the utils.log function
# lcdMenu: the lcdMenu class (not an object of that class!)
def run(config, btn_mapping, log, lcdMenu):
    timer_menu = lcdMenu(config.LCD, btn_mapping, scroll_direction=True, cycle=True, hide_menu_name=False, name="TIMERS")
    timer_values_original = [config.TIMER_1_DURATION, config.TIMER_2_DURATION, config.TIMER_3_DURATION]
    timer_values = timer_values_original.copy()  # here, the current timers time is stored when interrupting via the interrupt_pin (see below)
    timer_splits = [lambda: divmod(round(timer_values[0]), 60), lambda: divmod(round(timer_values[1]), 60), lambda: divmod(round(timer_values[2]), 60)]
    interrupt_pin = config.PIN_IN_BTN_1  # the interrupt btn stops the timer, saves the current time and goes back to the menu
    reset_pin = config.PIN_IN_BTN_2  # the reset btn restores the default value
    start_stop_pin = config.PIN_IN_SWITCH  # the start_stop switch starts/stops the timer
    
    # timer_number is the number of the timer that will be run, starting at 1
    # the _timer variable is needed because otherwise python will throw crazy errors regarding "variable accessed before assignment"...
    # ...just see it as a copy of the timer_number-1'th elemnt of the timer_values list (see above)
    def run_timer(timer_number: int, _timer: int):
        config.LCD.clear()
        config.LCD.putstr(f"Timer {timer_number}".center(16))
        last_start_stop_value = start_stop_pin.value()
        config.PIN_OUT_RELAIS.value(last_start_stop_value)
        last_time_ns = time_ns()
        while True:  # now run the timer (if the switch is high)
            config.LCD.move_to(0,1)
            _timer_div = divmod(round(_timer), 60)
            config.LCD.putstr(f"{_timer_div[0]:02d}:{_timer_div[1]:02d}".center(16))
            if interrupt_pin.value() == 1:
                timer_values[timer_number-1] = _timer  # save the current state
                last_start_stop_value = 0  # turn the LEDs off!
                config.PIN_OUT_RELAIS.value(last_start_stop_value)
                return None
            if reset_pin.value() == 1:
                _timer = timer_values_original[timer_number-1]  # reset the timers
            if _timer <= 0:
                config.PIN_OUT_RELAIS.off()
                return True
            sleep(0.05)
            if last_start_stop_value != (new_value := start_stop_pin.value()):
                last_start_stop_value = new_value
                config.PIN_OUT_RELAIS.value(new_value)
                last_time_ns = time_ns()
            if start_stop_pin.value() == 1:
                _timer -= (time_ns() - last_time_ns) / 1000**3
                last_time_ns = time_ns()
    
    timer_programs = [(f"T1 - {timer_splits[0]()[0]:02d}:{timer_splits[0]()[1]:02d}", lambda: run_timer(1, timer_values[0])),
                      (f"T2 - {timer_splits[1]()[0]:02d}:{timer_splits[1]()[1]:02d}", lambda: run_timer(2, timer_values[1])),
                      (f"T3 - {timer_splits[2]()[0]:02d}:{timer_splits[2]()[1]:02d}", lambda: run_timer(3, timer_values[2])),
                      ("Exit", timer_menu.stop)]
    timer_menu.setup(timer_programs)  # give it the callback list
    timer_menu.run()
    return True  # disable the "Quitting" message from lcdMenu

if __name__ == "__main__":
    from utils import Config, log
    from lcdMenu import lcdMenu
    config = Config()
    btn_mapping = {"ok_btn": config.PIN_IN_BTN_1, "next_btn": config.PIN_IN_BTN_2}  # the btn mapping for all lcdMenus
    run(Config(), btn_mapping, log, lcdMenu)