morseReceiver.py

# Introducton to Python breadboarding - Receive Blinks
#
#from SetPin import SetPin
import time
from MorseCode import MorseCode
import dataLink
def receiveblinks(RXpin,blinks=200,duration=.25):
    # Set up waittime until first high is read.
    # Assemble a list of high and low voltage readings
    while True:
        if RXpin.read_pin():
            print('\n1')
            receiveMorse(RXpin)
        else:
            print("*",end="",flush=True)
            time.sleep(duration)

def receiveMorse(RXpin):
    freq_reading = 1 # per s
    voltage_readings = [1] # Read input from pin before calling this function
    time.sleep(freq_reading)
    num_zeros = 0
    while num_zeros < 8:
        reading = RXpin.read_pin()
        print(reading)
        voltage_readings.append(1 if reading else 0)
        num_zeros = 0 if reading else num_zeros + 1
        time.sleep(freq_reading)
    dataLink.dataLink(convert_readings(voltage_readings))

def convert_readings(readings):
    # Convert into tuples in the form (voltage, time)
    converted = []
    num_zeros = 0 # consecutive
    num_ones = 0
    idx = 0
    while idx < len(readings):
        voltage = readings[idx]
        if voltage:
            if num_zeros > 0:
                converted.append(0, num_zeros)
                num_zeros = 0
            num_ones += 1
        else:
            if num_ones > 0:
                converted.append(1, num_ones)
                num_ones = 0

            num_zeros += 1
        idx += 1
    return converted

def decode_morse(readings):
    # Readings is list of voltages taken 1s apart
    # Assuming time unit is 1s
    # Decode readings into dots, dashes, and spaces
    morse_letter = "" # current letter that is being formed
    decoded = ""
    morse_letter = ''
    num_zeros = 0 # consecutive
    num_ones = 0
    idx = 0
    while idx < len(readings):
        voltage = readings[idx]
        if voltage:
            if num_zeros > 0:
                if num_zeros == 7:
                    decoded += ' '
                num_zeros = 0
            num_ones += 1
        else:
            if num_ones > 0:
            # Figure out whether on voltage was a dot or dash
                morse_letter += '.' if num_ones == 1 else '-'
                num_ones = 0

            num_zeros += 1
            if num_zeros == 3:
                # Decode letter
                decoded += get_letter(morse_letter)
                morse_letter = ''

        idx += 1
    return decoded

def get_letter(morse):
    for l, m in MorseCode.items():
        if m == morse:
            return l
    # If didn't find a match for the morse, something went wrong...
    return '*'

if __name__ == "__main__":
    with SetPin(16,"GPIO_23",direction="RX") as RXpin:
        receiveblinks(RXpin)