Joining Raspberry Pi and Arduino applications with SIMPL

01 # import necessary modules
02 import sys
03 import csimpl
04 if sys.version < '3':
05    from Tkinter import *
06    iimport tkMessageBox
07 else:
08    from tkinter import *
09    from tkinter import messagebox
10
11 BRINKY_RITE = 0
12 global leds            # a series of eight button widgets
13 global numLeds
14
15 # a callback for changing the text value of a led button
16 def hndlChange(event):
17    # make certain that entered text is black
18    event.widget["foreground"] = "black"
19    # decide on the next character after a left button mouse click
20    if event.widget["text"] == "OFF":
21        event.widget["text"] = "ON"
22    else:
23        event.widget["text"] = "OFF"
24
25 # a callback for the send button
26 def hndlSubmit(nee, receiverId):
27    # assemble the message
28    outToken = BRINKY_RITE
29    outValues = 0
30    for num in range(numLeds):
31        if leds[num]["text"] == "ON":
32            outValues |= (1 << num)
33
34    # load the message to be sent to the Arduino sketch
35    nee.packMsg(nee.BIN, "hb", outToken, outValues)
36
37    # send the message
38    retVal = nee.send(receiverId)
39    if retVal == -1:
40        if sys.version < '3':
41           tkMessageBox.showerror("Error", nee.whatsMyError())
42        else:
43            messagebox.showerror("Error", nee.whatsMyError())
44        sys.exit(-1)
45
46 # operational start of the program
47 # check command line
48 if len(sys.argv) == 1:
49    rName = "ARDUINO"
50 elif len(sys.argv) == 2:
51    rName = sys.argv[1] + ":" + "ARDUINO"
52 else:
53    print("Incorrect command line")
54    sys.exit(-1)
55
56 # initialize some variables
57 numLeds = 8
58 leds = [None] * numLeds
59
60 # make an instance of Simpl
61 nee = csimpl.Simpl( "EIGHT_LEDS", 1024)
62
63 # name locate the C program SIMPL receiver
64 receiverId = nee.nameLocate("sys.argv[1]:ARDUINO")
65 if receiverId == -1:
66    err = nee.whatsMyError() + ": is the receiver program running?"
67    if sys.version < '3':
68       tkMessageBox.showerror("Error", err)
69    else:
70       messagebox.showerror("Error", err)
71    sys.exit(-1)
72
73 # initialize Tk for graphics
74 root = Tk()
75 rowframe = Frame(root)
76 rowframe.pack(fill=BOTH)
77 for num in range(numLeds):
78    leds[num] = Button(rowframe,  borderwidth=2, relief=SOLID, justify=CENTER, bg="Yellow", \
                         fg="Black", text="OFF", font=("Times", 12, "bold"), width=3)
79    leds[num].bind("<Button-1>", hndlChange)
80    leds[num].pack(side=LEFT)
81
82 # the bottom frame of buttons
83 rowframe = Frame(root)
84 rowframe.pack(fill=BOTH)
85 Button(rowframe, justify=CENTER, text="Send", font=('Times', 12, 'bold'), \
          command=(lambda: hndlSubmit(nee, receiverId))).pack()
86
87 # handle user input
88 root.mainloop()