#!/usr/bin/python3

"""
MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy 
in the Software without restriction, including without limitation the rights 
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
copies of the Software, and to permit persons to whom the Software is 
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in 
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 
THE SOFTWARE.

This example shows how to use the RS232 serial port of the BL i.MX8MM.
"""

import serial, time
# Configure the serial driver
ser = serial.Serial()
# Communicate via RS232
ser.port = "/dev/ttymxc0"
ser.baudrate = 115200
ser.bytesize = serial.EIGHTBITS
ser.parity = serial.PARITY_NONE
ser.stopbits = serial.STOPBITS_ONE

# Try to open the port
try:
    ser.open()
except Exception as e:
    print ("Error while opening the serial port: " + str(e))
    exit()

# If the port is open, write Hello World and wait
# for a reply which must be terminated by an LF.
if ser.isOpen():
    try:
        # Clear the buffers
        ser.flushInput()
        ser.flushOutput()
        while True:
            # Write to the serial port
            ser.write("Hello World!\n".encode())
            # Write it immediately
            ser.flush()
            print("Write data!")
            try:
                # Now wait for the other side to send something
                myvar = ser.read_until() # Wait for LF
            except:
                # If there was an error during receiving, print an error
                myvar = b'Error receiving!'
                
            # Display the received data, which must be ASCII characters in this example
            print("Read data! " + myvar.decode('ascii'))
            time.sleep(0.05)
        ser.close()
    except Exception as e1:
        print ("Error while communicating...:" + str(e1))
else:
    print ("Cannot open serial port!")