# Project#1 - Pycharm, pyseril, and Arduino comms (LCD readout)
# Information - In this project, we're going to import some modules, connect to the RPInoRPI and send over some commands
import time  # The 'time' module is included with pycharm and allows for us to create delays.
import serial  # The 'serial' or 'pyserial' module needs to be imported.  See the project video for more info.

# Note that serial/pyserial is the module that allows for us to communicate with external microcontrollers.
# Remember that you need to program your RPInoRPI with the code for project#1.

# The first thing that we need to do is to talk to our RPInoRPI.
try:  # Try to establish communication with the RPInoRPI board.  if successful, only the 'try:' will be executed
    MCU = serial.Serial(port='COM10', baudrate=115200, timeout=0.01)  # See project video for more info on this line.
    time.sleep(1)  # Wait one second
except:  # If communication with the RPInoRPI could not be established, then perform the following instead:
    print('System Locked - Cannot communicate with MCU.  Close this program, then reconnect to MCU and restart program')
    while True:  # Forever loop.  Close the program and start again.  Check connection to the RPInoRPI
        pass  # Do nothing




def write_read(x):  # This function acts to send data (x) to the RPInoRPI.  Nothing more.
    MCU.write(bytes(x, 'utf-8'))  # Write the value stored in 'x' to the RPInoRPI
    time.sleep(0.2)  # Wait 0.2 seconds/200ms


# Main Code
x = 0  # Create a variable named x and set it to 0
counter = 0 # Create a variable named 'counter' and set it to 0
while True:  # Run the following code until you close the program (loop forever)
    x = str(counter) # x now equals the string value in counter.  Counter is an integer. We can't send integers.
    write_read(x)    # call the write_read function and send 'x' along with it. We can only send string data
    counter = counter + 1  # Increment counter. Or rather, add 1 to counter.  Counter is an integer. A while number.
    if counter == 10:  # If counter is 10, reset to 0.  We will send values 0 through 9.
        counter = 0    # Only set counter to 0 when counter equals 10
    time.sleep(2)  # Wait for 2 seconds then start over

# This is the end of the first project.  Not too bad, right?  Note that your Arduino is going to read ASCII format
# which means that when we send a 5, we're going to get the ASCII representation of 5 at the RPInoRPI.
# More info on this in the project video.
# We used two integers for this program: x and counter.  We could have used only 1, but I didn't want to confuse things.
# We needed to keep one as a number, and the other as a string.  We can only send strings to the RPInoRPI.
# A string is a character or set of characters like "Hi there" or "123ABC".  Anything in quotes.
# An integer is a whole number that we can use for numeric purposes.  For instance, 1 or 100.