example graphics.py only runs once

[jo-elektro]

Hi,

I have been playing a little with this excellent library in conjunction with a 64x32 RGB panel from Adafruit together with the clock HAT and focusing on the the python samples. On the software side I used the brand new installation script from Ada which was only updated last week and is pretty straight forward. https://learn.adafruit.com/adafruit-rgb-matrix-plus-real-time-clock-hat-for-raspberry-pi/driving-matrices

The sample work fine but I have run into a problem with the graphics.py example which only wants to run once in Idle. Running it a second time the terminal spits out a bunch of server call issues as listed bellow. This happens only if I run the program from Idle as sudo. If I type sudo ./graphics.py --led-chain=2 everything is A-ok.

---

Unhandled server exception! Thread: SockThread Client Address: ('127.0.0.1', 49775) Request: <socket._socketobject object at 0x76c35d88> Traceback (most recent call last): File "/usr/lib/python2.7/SocketServer.py", line 295, in _handle_request_noblock self.process_request(request, client_address) File "/usr/lib/python2.7/SocketServer.py", line 321, in process_request self.finish_request(request, client_address) File "/usr/lib/python2.7/SocketServer.py", line 334, in finish_request self.RequestHandlerClass(request, client_address, self) File "/usr/lib/python2.7/idlelib/rpc.py", line 503, in init SocketServer.BaseRequestHandler.init(self, sock, addr, svr) File "/usr/lib/python2.7/SocketServer.py", line 655, in init self.handle() File "/usr/lib/python2.7/idlelib/run.py", line 291, in handle rpc.RPCHandler.getresponse(self, myseq=None, wait=0.05) File "/usr/lib/python2.7/idlelib/rpc.py", line 280, in getresponse response = self._getresponse(myseq, wait) File "/usr/lib/python2.7/idlelib/rpc.py", line 300, in _getresponse response = self.pollresponse(myseq, wait) File "/usr/lib/python2.7/idlelib/rpc.py", line 424, in pollresponse message = self.pollmessage(wait) File "/usr/lib/python2.7/idlelib/rpc.py", line 376, in pollmessage packet = self.pollpacket(wait) File "/usr/lib/python2.7/idlelib/rpc.py", line 347, in pollpacket r, w, x = select.select([self.sock.fileno()], [], [], wait) error: (4, 'Interrupted system call')

*** Unrecoverable, server exiting!

I have read a few thing about the no_block option but this is way past my pythonic comprehension and some help would be very appreciated.

Greetings,

Jo

[hzeller]

It is not clear what you are trying to do here. Why is your code having a socket connection open ?

Anyway, if you try to run two instances of programs in parallel that try to drive the hardware low-level, that won't work of course as they would both need the same resources. However, consecutively, they should work.

[jo-elektro]

Hi,

I am not trying anything special I think. Just copied the example from the readme text in /home/pi/rpi-rgb-led-matrix/bindings/python into Idle and then try to execute it.

!/usr/bin/env python

import time import sys

from rgbmatrix import RGBMatrix, RGBMatrixOptions from PIL import Image

if len(sys.argv) < 2: sys.exit("Require an image argument") else: image_file = sys.argv[1]

image = Image.open(image_file)

Configuration for the matrix

options = RGBMatrixOptions() options.rows = 32 options.chain_length = 1 options.parallel = 1 options.hardware_mapping = 'regular' # If you have an Adafruit HAT: 'adafruit-hat'

matrix = RGBMatrix(options = options)

Make image fit our screen.

image.thumbnail((matrix.width, matrix.height), Image.ANTIALIAS)

matrix.SetImage(image.convert('RGB'))

try: print("Press CTRL-C to stop.") while True: time.sleep(100) except KeyboardInterrupt: sys.exit(0)

[jo-elektro]

I figured out that it trips on the line matrix = RGBMatrix(options = options but I understand too little of this on how it is causing the program to open multiple instances.