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#!/usr/bin/env python
# coding=utf-8
# MIT License
#
# Copyright (C) 2021 Kontron Electronics GmbH <support@pixtend.de>
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files
# (the "Software"), to deal 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.
#
# For further details see LICENSE.txt.
# -----------------------------------------------------------------------------
# Attention:
# The PiXtend Python Library v2 (PPLv2) was developed as a Python
# library / module to make use of the inheritance functionality of Python.
# However, since the library must access the hardware based SPI bus on the
# Raspberry Pi only ONE single instance of the PiXtendV2S or PiXtendV2L
# class per PiXtend is allowed! The PPLv2 as well as the SPI bus is not
# capable of aggregating (multiplexing) multiple instances of either
# PiXtend class. Please keep this in mind when developing your application.
# We suggest building one central program which creates the PiXtend object
# and all other programs, functions, threads use inter-process communication
# with the main program to send data to the PiXtend board to manipulate the
# analog and/or digital outputs or to get information from the inputs.
# -----------------------------------------------------------------------------
from __future__ import print_function
# Import Pixtend V2 -S- class
from pixtendv2s import PiXtendV2S
import paho.mqtt.client as mqtt
import time, os, urlparse, sys, re
# The callback for when the client receives a CONNACK response from the server.
def on_connect(client, userdata, flags, rc):
# We subcribe to the topics /pixtendv2/relX and wait for the user to update
# the one of the topics with a message containing a 1 to turn on a relay or
# a 0 to turn a relay off.
client.subscribe("/pixtendv2/rel0")
client.subscribe("/pixtendv2/rel1")
client.subscribe("/pixtendv2/rel2")
client.subscribe("/pixtendv2/rel3")
# The callback for when a PUBLISH message is received from the server.
def on_message(client, userdata, msg):
if ((len(msg.topic) == 15) and (msg.topic[:len(msg.topic)-1] == "/pixtendv2/rel")):
try:
relnum = int(msg.topic[-1:])
try:
value = bool(int(msg.payload))
if (value is False or value is True):
if (relnum == 0):
p.relay0 = value
elif (relnum == 1):
p.relay1 = value
elif (relnum == 2):
p.relay2 = value
elif (relnum == 3):
p.relay3 = value
except ValueError:
value = 0
except ValueError:
relnum = 0
strSlogan1 = "PiXtend V2 -S- Python Library and MQTT Demo."
strSlogan2 = "PiXtend V2 -S- Python Library and MQTT Demo finished."
# -----------------------------------------------------------------
# Print Art and Slogan
# -----------------------------------------------------------------
print("")
print(" ____ _ _ ____ __ _ _____ _____")
print(" / __ \\(_) |/ / /____ ____ ____/ / | | / /__ \\ / ___/")
print(" / /_/ / /| / __/ _ \\/ __ \\/ __ / | | / /__/ / ____ \\__ \\ ")
print(" / ____/ // / /_/ __/ / / / /_/ / | |/ // __/ /___/__ / / ")
print("/_/ /_//_/|_\\__/\\___/_/ /_/\\__,_/ |___//____/ /____/ ")
print("")
print(strSlogan1)
print("")
# Setup MQTT Client for publish and subcribe
client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message
client.username_pw_set(USERNAME_HERE, PASSWORD_HERE)
client.connect(SERVER_HERE, PORT_HERE, 60)
# Non-Blocking call that processes network traffic, dispatches callbacks
client.loop_start()
# -----------------------------------------------------------------
# Create instance - SPI communication starts automatically
# -----------------------------------------------------------------
p = PiXtendV2S()
# -----------------------------------------------------
# Main Program
# -----------------------------------------------------
if p is not None:
print("Running Main Program - Hit Ctrl + C to exit")
# Set some variables needed in the main loop
is_config = False
cycle_counter = 0
toggle_counter = 0
while True:
try:
# Check if SPI communication is running and the received data is correct
if p.crc_header_in_error is False and p.crc_data_in_error is False:
cycle_counter += 1
if not is_config:
is_config = True
print("The value False = Off and the value True = On")
print("")
# Setting the relays to Off (False)
p.relay0 = p.OFF
p.relay1 = p.OFF
p.relay2 = p.OFF
p.relay3 = p.OFF
# Build text with values from all digital outputs und relays
str_text = "Cycle No.: {0}\n".format(cycle_counter)
str_text += "Digital Input 0: {0}\n".format(p.digital_in0)
str_text += "Digital Input 1: {0}\n".format(p.digital_in1)
str_text += "Digital Input 2: {0}\n".format(p.digital_in2)
str_text += "Digital Input 3: {0}\n".format(p.digital_in3)
str_text += "Digital Input 4: {0}\n".format(p.digital_in4)
str_text += "Digital Input 5: {0}\n".format(p.digital_in5)
str_text += "Digital Input 6: {0}\n".format(p.digital_in6)
str_text += "Digital Input 7: {0}\n".format(p.digital_in7)
str_text += "Relay 0: {0}\n".format(p.relay0)
str_text += "Relay 1: {0}\n".format(p.relay1)
str_text += "Relay 2: {0}\n".format(p.relay2)
str_text += "Relay 3: {0}\n".format(p.relay3)
# Print text to console
print(str_text, end="\r")
# Reset cursor
for i in range(0, 13, 1):
sys.stdout.write("\x1b[A")
# MQTT processing...
if toggle_counter >= 10:
client.publish("/pixtendv2/digin0", int(p.digital_in0))
client.publish("/pixtendv2/digin1", int(p.digital_in1))
client.publish("/pixtendv2/digin2", int(p.digital_in2))
client.publish("/pixtendv2/digin3", int(p.digital_in3))
client.publish("/pixtendv2/digin4", int(p.digital_in4))
client.publish("/pixtendv2/digin5", int(p.digital_in5))
client.publish("/pixtendv2/digin6", int(p.digital_in6))
client.publish("/pixtendv2/digin7", int(p.digital_in7))
toggle_counter = 0
else:
toggle_counter += 1
# Wait 0.5sec or 500ms
time.sleep(0.5)
# Overwrite old text on screen
sys.stdout.write(re.sub(r"[^\s]", " ", str_text))
# Reset cursor
for i in range(0, 13, 1):
sys.stdout.write("\x1b[A")
# Catch errors and if an error is caught, leave the program
except IOError as e:
# Print out the caught error and leave program
print ("I/O error({0}): {1}".format(e.errno, e.strerror))
p.close()
time.sleep(0.25)
del p
p = None
break
except ValueError as ve:
# Print out the caught error and leave program
print ("Value error({0}): {1}".format(ve.errno, ve.strerror))
p.close()
time.sleep(0.25)
del p
p = None
break
except RuntimeError as re:
# Print out the caught error and leave program
print ("Runtime error({0}): {1}".format(re.errno, re.strerror))
p.close()
time.sleep(0.25)
del p
p = None
break
except KeyboardInterrupt:
# Keyboard interrupt caught, Ctrl + C, now clean up and leave program
client.loop_stop()
client.disconnect()
client = None
for i in range(0, 14, 1):
print("")
print(strSlogan2)
p.digital_out0 = p.OFF
p.digital_out1 = p.OFF
p.digital_out2 = p.OFF
p.digital_out3 = p.OFF
p.relay0 = p.OFF
p.relay1 = p.OFF
p.relay2 = p.OFF
p.relay3 = p.OFF
time.sleep(0.25)
# We must call the close() function to end the communication with the
# PiXtend V2 -S- microcontroller, this way no error is thrown and we
# can start this program again right away.
p.close()
# We have to wait for the communication to end
time.sleep(0.25)
del p
p = None
break
else:
# Close any possible MQTT connection
client.loop_stop()
client.disconnect()
client = None
p = None
# If there was an error creating the PiXtend V2 -S- instance, leave the program.
print("")
print("There was a problem creating the Pixtend V2 -S- instance. Quitting.")
print("")
print(strSlogan2)
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