Hi all,
First off, I'm a newbe to the BBB, and more familiar with electronic
hardware than software programming but thought I would give it a go.
I have a BBB which I have updated with the latest Software
BBB-eMMC-flasher-debian-7.8-lxde-4gb-armhf-2015-03-01-4gb.img.xz
I would like to develop an application on the BBB with a 4D Systems 4.3"
LCD Cape. Part number 4DCAPE-43T which will run a simple GUI to control a
VSD and motor.
Having connected the display which works perfectly, and downloaded the USB
drivers I'm able to connect to the BBB and view its webpage. Found the IDE
which is loaded onto the Debian image called Cloud9 and decided to give
this a go.
All was going well, using the example python programs, making changes and
by simply hitting the RUN button it would flash LED's on the GPIO ports etc
- no problem I thought "this is the easiest development board I have played
with in a long while"
I began to read up on a suitable GUI to use and for starters decided to try
TKinter. having downloaded a few sample pieces of code I have hit a problem.
If I try to run any code from Cloud9 which references TKinter, it will come
up with the following problem, I have copied the sample code as well.
Program******************************************
import Tkinter as tk
counter = 0
def counter_label(label):
counter = 0
def count():
global counter
counter += 1
label.config(text=str(counter))
label.after(1000, count)
count()
root = tk.Tk()
root.title("Counting Seconds")
label = tk.Label(root, fg="dark green")
label.pack()
counter_label(label)
button = tk.Button(root, text='Stop', width=25, command=root.destroy)
button.pack()
root.mainloop()
Cload9 terminal output******************************
Traceback (most recent call last):
File "/var/lib/cloud9/examples/blink.py", line 14, in <module>
root = tk.Tk()
File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1712, in __init__
self.tk = _tkinter.create(screenName, baseName, className, interactive,
wantobjects, useTk, sync, use)
_tkinter.TclError: no display name and no $DISPLAY environment variable
I have found a work around, which is to write the code in Cloud9 as usual,
it will flash up that it has saved all the changes automatically, then
using a keyboard plugged directly into the BBB and a terminal open on the
LCD cape, I can run the code directly on the BBB and it will work fine.
If I have to, I will continue to develop my project like this, as I've had
to do much worst in the past on other boards!! but I'm sure that there must
be an easy fix to this so I don't need the extra keyboard attached to the
BBB. it would also increase my "code/run/fix" cycle.
Another option would be to develop directly on the BBB. Can I run a HDMI
monitor from the BBB at the same time as the LCD cape? (its too small a
screen to develop anything on the LCD cape itself)
Any help would be much appreciated
Steve.
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