Overly complicated Python script with multiple LED programs which can be changed by pressing an attached button

main.py

from enum import Enum
from multiprocessing import Process
from time import sleep

import RPi.GPIO as GPIO

PINS = {'in': 19, 'out': 21}


class Program(Enum):
    OFF = 1
    ON = 2
    BLINK = 3
    FAST_BLINK = 4

    def next(self):
        cls = self.__class__
        members = list(cls)
        index = members.index(self) + 1
        if index >= len(members):
            index = 0
        return members[index]


def main():
    GPIO.setwarnings(False)
    setup_gpio_pins(PINS)
    start(PINS, Program.OFF)


def setup_gpio_pins(pins):
    GPIO.setmode(GPIO.BCM)
    GPIO.setup(pins['in'], GPIO.IN, pull_up_down=GPIO.PUD_UP)
    GPIO.setup(pins['out'], GPIO.OUT)


def start(pins, program, program_process=None):
    print('Activating program <{}>'.format(program.name))
    while True:
        if not program_process:
            program_process = Process(target=activate_program, args=[program, pins])
            program_process.start()
        state = GPIO.input(pins['in'])
        if state == False:  # pressed
            program_process.terminate()
            program_process.join()
            sleep(0.2)
            break
    start(pins, program.next())


def activate_program(program, pins):
    if program == Program.OFF:
        GPIO.output(pins['out'], GPIO.LOW)
        while True:
            sleep(1)
    if program == Program.ON:
        GPIO.output(pins['out'], GPIO.HIGH)
        while True:
            sleep(1)
    if program == Program.BLINK:
        while True:
            GPIO.output(pins['out'], GPIO.HIGH)
            sleep(1)
            GPIO.output(pins['out'], GPIO.LOW)
            sleep(1)
    if program == Program.FAST_BLINK:
        while True:
            GPIO.output(pins['out'], GPIO.HIGH)
            sleep(0.1)
            GPIO.output(pins['out'], GPIO.LOW)
            sleep(0.1)


if __name__ == '__main__':
    try:
        main()
    except KeyboardInterrupt:
        print('Exiting...')
        GPIO.cleanup()