1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
#!/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 class
from pixtendv2s import PiXtendV2S
import time
import sys
strSlogan1 = "PiXtend Python Library v2 (PPLv2) demo."
strSlogan2 = "PiXtend Python Library v2 (PPLv2) demo finished."
# -----------------------------------------------------------------
# Print Art and Slogan
# -----------------------------------------------------------------
print("")
print(" ____ _ _ ____ __ _ _____ _____")
print(" / __ \\(_) |/ / /____ ____ ____/ / | | / /__ \\ / ___/")
print(" / /_/ / /| / __/ _ \\/ __ \\/ __ / | | / /__/ / ____ \\__ \\ ")
print(" / ____/ // / /_/ __/ / / / /_/ / | |/ // __/ /___/__ / / ")
print("/_/ /_//_/|_\\__/\\___/_/ /_/\\__,_/ |___//____/ /____/ ")
print("")
print(strSlogan1)
print("")
# -----------------------------------------------------------------
# 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
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("One time configuration: Setting the relays and digital outputs in an alternating pattern")
print("The value False = OFF and the value True = ON")
print("")
# Setting the relays and digital outputs to a pattern which can be toggled later.
# Side effect: the LEDs on the PiXtend V2 -S- board alternate nicely back and forth.
p.relay0 = p.ON
p.relay1 = p.OFF
p.relay2 = p.ON
p.relay3 = p.OFF
p.digital_out0 = p.ON
p.digital_out1 = p.OFF
p.digital_out2 = p.ON
p.digital_out3 = p.OFF
# clear the text on screen
str_text = " \n"
for i in range(0, 27, 1):
str_text += " \n"
str_text += " "
# Print text to console
print(str_text, end="\r")
# Reset cursor
for i in range(0, 28, 1):
sys.stdout.write("\x1b[A")
# Print the info text to console
str_text = "Cycle No.: {0}\n".format(cycle_counter)
str_text += " \n"
str_text += "PiXtend V2 -S- Info:\n"
str_text += "Firmware: {0}\n".format(p.firmware)
str_text += "Hardware: {0}\n".format(p.hardware)
str_text += "Model: {0}\n".format(chr(p.model_in))
str_text += " \n"
str_text += "Digital Inputs:\n"
str_text += "DigitalIn0: {0}\n".format(p.digital_in0)
str_text += "DigitalIn1: {0}\n".format(p.digital_in1)
str_text += "DigitalIn2: {0}\n".format(p.digital_in2)
str_text += "DigitalIn3: {0}\n".format(p.digital_in3)
str_text += "DigitalIn4: {0}\n".format(p.digital_in4)
str_text += "DigitalIn5: {0}\n".format(p.digital_in5)
str_text += "DigitalIn6: {0}\n".format(p.digital_in6)
str_text += "DigitalIn7: {0}\n".format(p.digital_in7)
str_text += " \n"
str_text += "Digital Outputs:\n"
str_text += "DigitalOut0: {0}\n".format(p.digital_out0)
str_text += "DigitalOut1: {0}\n".format(p.digital_out1)
str_text += "DigitalOut2: {0}\n".format(p.digital_out2)
str_text += "DigitalOut3: {0}\n".format(p.digital_out3)
str_text += " \n"
str_text += "Relays:\n"
str_text += "Relay0: {0}\n".format(p.relay0)
str_text += "Relay1: {0}\n".format(p.relay1)
str_text += "Relay2: {0}\n".format(p.relay2)
str_text += "Relay3: {0}\n".format(p.relay3)
str_text += " "
# Print text to console
print(str_text, end="\r")
# Reset cursor
for i in range(0, 28, 1):
sys.stdout.write("\x1b[A")
# Toggle the relays and digital outputs on and off
p.relay0 = not p.relay0
p.relay1 = not p.relay1
p.relay2 = not p.relay2
p.relay3 = not p.relay3
p.digital_out0 = not p.digital_out0
p.digital_out1 = not p.digital_out1
p.digital_out2 = not p.digital_out2
p.digital_out3 = not p.digital_out3
else:
for i in range(0, 29, 1):
print("")
print("")
print("Communication error, the data from the microcontroller is not correct!")
print("Leaving the application. Please check that the Raspberry Pi can communicate")
print("with the microcontroller on the PiXtend V2 -S- board.")
print("")
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)
p.close()
time.sleep(0.25)
del p
p = None
break
# Wait some time, SPI communication will continue in the background
time.sleep(1)
# 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
for i in range(0, 29, 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)
p.close()
time.sleep(0.25)
del p
p = None
break
|
