'''
Mission 6 - final
Solution code with 2 functions
'''
from codex import *
from time import sleep

delay = 1

# --Function
def heart_beat():
    display.show(pics.HEART)
    sleep(delay)
    display.show(pics.HEART_SMALL)
    sleep(delay)

def adjust_speed():
    global delay
    if buttons.was_pressed(BTN_A):
        delay = delay + 0.2  
    if buttons.was_pressed(BTN_B):
        delay = delay - 0.2
    if delay < 0.2:
        delay = 0.2

# --Main Program
while True:
    heart_beat()
    adjust_speed()

    # Kill Switch
    if buttons.was_pressed(BTN_U):
        break