# ex1.py
# exercise 1 in Lecture 6
# EEIoT23  Oct 2023

from machine import Pin, Timer, PWM
import sys

PWMMAX = 1023
Rled = PWM(Pin(19))
Gled = PWM(Pin(18))
Bled = PWM(Pin(17))
Rled.freq(2000)
Gled.freq(2000)
Bled.freq(2000)

Rled.duty(0)
Gled.duty(0)
Bled.duty(0)

led_period = 1000  # default
toggle_mode = 1
rled_value = 0
gled_value = 0
bled_value = 0
led_status = False

timer=Timer(1)
def timer_isr(event):
    global led_status
    #led.value(not led.value())
    led_status = not led_status
    if led_status:
        Rled.duty(rled_value)
        Gled.duty(gled_value)
        Bled.duty(bled_value)
    else:
        Rled.duty(0)
        Gled.duty(0)
        Bled.duty(0)
        
    

timer.init(period=led_period, mode=Timer.PERIODIC,
                           callback=timer_isr)

# helper function for cmdInt()
# separate command and parameter
# at "="
def splitCmd(userstr):
    result = userstr.find("=")
    if result == -1:
        noparm = 1
        cmdstr = userstr.strip()
        parmstr = '' # not used
    else:
        noparm = 0
        splitstr = userstr.split("=")
        cmdstr = splitstr[0].strip()
        parmstr = splitstr[1].strip()
    return cmdstr, parmstr, noparm

#command interpreter function
def cmdInt(userstr):
    global rled_value,gled_value,bled_value, toggle_mode, led_period, timer
    cmdstr, parmstr, noparm = splitCmd(userstr)

    if cmdstr.lower() == "rled":
        if noparm==1:
            print("Current red led value = {}".format(rled_value))
        else:            
            rled_value = int(parmstr)
            if rled_value > PWMMAX:
                rled_value = PWMMAX
            if rled_value < 0:
                rled_value = 0
            Rled.duty(rled_value)
    elif cmdstr.lower() == "gled":
        if noparm==1:
            print("Current green led value = {}".format(gled_value))
        else:            
            gled_value = int(parmstr)
            if gled_value > PWMMAX:
                gled_value = PWMMAX
            if gled_value < 0:
                gled_value = 0
            Gled.duty(gled_value)
    elif cmdstr.lower() == "bled":
        if noparm==1:
            print("Current blue led value = {}".format(bled_value))
        else:            
            bled_value = int(parmstr)
            if bled_value > PWMMAX:
                bled_value = PWMMAX
            if bled_value < 0:
                bled_value = 0
            Bled.duty(bled_value)
            
    elif cmdstr.lower() == "toggle":
        if noparm==1:
            print("Current toggle mode = {}".format(toggle_mode))
        else:            
            toggle_mode = int(parmstr)
            if toggle_mode >= 1:
                toggle_mode = 1
                timer.init(period=led_period, mode=Timer.PERIODIC,
                           callback=timer_isr)
            elif toggle_mode <= 0:
                toggle_mode = 0
                timer.deinit()
    elif cmdstr.lower() == "period":
        if noparm==1:
            print("Current led period = {}".format(led_period))
        else:            
            led_period = int(parmstr)
            if led_period > 2000: # set maximum period to 2 seconds
                led_period = 2000
            elif led_period < 50: # minimum period is 50 milliseconds
                led_period = 50
            if toggle_mode: # deinit and init with new period
                timer.init(period=led_period, mode=Timer.PERIODIC,
                           callback=timer_isr)                
    else:
        print("Invalid command")    

def user_input():
    print('\nEnter command : ')
    user_str = input()
    #newline_char = sys.stdin.readline()
    cmdInt(user_str)


while True:
    user_input()