Python • "lgpio.error: 'GPIO busy'" when running flask server and updating e-ink display via python script

Code:

Traceback (most recent call last):  File "/usr/lib/python3/dist-packages/gpiozero/pins/pi.py", line 411, in pin    pin = self.pins[info]          ~~~~~~~~~^^^^^^KeyError: PinInfo(number=11, name='GPIO17', names=frozenset({'BOARD11', 17, 'WPI0', 'GPIO17', '17', 'J8:11', 'BCM17'}), pull='', row=6, col=1, interfaces=frozenset({'', 'spi', 'dpi', 'gpio', 'uart'}))During handling of the above exception, another exception occurred:Traceback (most recent call last):  File "/home/tempus/tempus-db/manage/../photodisplay.py", line 8, in <module>    from waveshare_epd import epd7in5_V2  File "/home/tempus/tempus-db/waveshare_epd/epd7in5_V2.py", line 32, in <module>    from . import epdconfig  File "/home/tempus/tempus-db/waveshare_epd/epdconfig.py", line 313, in <module>    implementation = RaspberryPi()                     ^^^^^^^^^^^^^  File "/home/tempus/tempus-db/waveshare_epd/epdconfig.py", line 56, in __init__    self.GPIO_RST_PIN    = gpiozero.LED(self.RST_PIN)                           ^^^^^^^^^^^^^^^^^^^^^^^^^^  File "/usr/lib/python3/dist-packages/gpiozero/devices.py", line 108, in __call__    self = super().__call__(*args, **kwargs)           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  File "/usr/lib/python3/dist-packages/gpiozero/output_devices.py", line 192, in __init__    super().__init__(pin, active_high=active_high,  File "/usr/lib/python3/dist-packages/gpiozero/output_devices.py", line 74, in __init__    super().__init__(pin, pin_factory=pin_factory)  File "/usr/lib/python3/dist-packages/gpiozero/mixins.py", line 75, in __init__    super().__init__(*args, **kwargs)  File "/usr/lib/python3/dist-packages/gpiozero/devices.py", line 553, in __init__    pin = self.pin_factory.pin(pin)          ^^^^^^^^^^^^^^^^^^^^^^^^^  File "/usr/lib/python3/dist-packages/gpiozero/pins/pi.py", line 413, in pin    pin = self.pin_class(self, info)          ^^^^^^^^^^^^^^^^^^^^^^^^^^  File "/usr/lib/python3/dist-packages/gpiozero/pins/lgpio.py", line 126, in __init__    lgpio.gpio_claim_input(  File "/usr/lib/python3/dist-packages/lgpio.py", line 755, in gpio_claim_input    return _u2i(_lgpio._gpio_claim_input(handle&0xffff, lFlags, gpio))           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  File "/usr/lib/python3/dist-packages/lgpio.py", line 458, in _u2i    raise error(error_text(v))lgpio.error: 'GPIO busy'

Code:

import subprocessfrom flask import Flask, url_for, render_template, request, jsonifyfrom markupsafe import escapefrom manager import *app = Flask(__name__)@app.route('/')def index():  # define dashboard buttons  button_list = [    {"id": "dashboard", "text": "Start Dashboard", "icon": "layout-dashboard.svg", "route":""},     {"id": "photo", "text": "Display Image", "icon": "image.svg", "route":"/showimage"},     {"id": "clear", "text": "Clear Dashboard", "icon": "brush-cleaning.svg", "route":"/clear"},     {"id": "pause", "text": "Pause Dashboard", "icon": "circle-pause.svg", "route":"/dashstop"}  ]  return render_template('index.html', buttons=button_list)# start dashboard route@app.route('/dashstart', methods=['POST'])def dashstart():  if request.is_json:    data = request.get_json()    timer = data["timing"]    hasjob = set_tempus_job(timer)    if hasjob:      subprocess.run(['python3', '../main.py'])      result = f"Dashboard started successfully. Refresh time interval is {timer} minutes."      print(result)      return jsonify({'message': result})    else:      return jsonify({'error': 'Dashboard not started'}), 400  else:    return jsonify({'error': 'Request must be JSON'}), 400# display photo route@app.route('/showimage', methods=['POST'])def showimage():  stopped = clear_tempus_jobs()  if stopped:    subprocess.run(['python3', '../photodisplay.py'])    result = "Switched to photo display mode"    print(result)    return jsonify({'message': result})  else:     return jsonify({'error': 'Photo display failed'}), 400# clear screen route@app.route('/clear', methods=['POST'])def cleardash():  clear_display()  result = "Dashboard Cleared Successfully"  print(result)  return jsonify({'message': result})# stop dashboard cron job route@app.route('/dashstop', methods=['POST'])def dashstop():  stopped = clear_tempus_jobs()  if stopped:    result = "Dashboard Paused Successfully"    print(result)    return jsonify({'message': result})  else:    return jsonify({'error': 'Dashboard not paused'}), 400

Code:

import loggingimport sysimport pathlibimport timefrom PIL import Imagefrom waveshare_epd import epd7in5_V2if __name__ == '__main__':logger = logging.getLogger('tempusdash')config = {"imgW": 800,"imgH": 480,"angle": 0,"photo_path": "photo-display/photo.png","error_photo": "photo-display/error.png"}# load configuration for photo displaycurrPath = str(pathlib.Path(__file__).parent.absolute())# initialize displayepd = epd7in5_V2.EPD()img_wid = config["imgW"]img_ht = config["imgH"]angle = config["angle"]photo_path = currPath + "/" + config["photo_path"]error_photo = currPath + "/" + config["error_photo"]# create and configure loggerlogging.basicConfig(filename="logfile.log", format='%(asctime)s %(levelname)s - %(message)s', filemode='a')logger = logging.getLogger('tempusdash')logger.addHandler(logging.StreamHandler(sys.stdout))  # print logger to stdoutlogger.setLevel(logging.INFO)logger.info("Starting photo display")# get pictureif pathlib.Path(photo_path).exists():dashimage = Image.open(photo_path)log_msg = "Photo suscessfully displayed on screen"else:dashimage = Image.open(error_photo)log_msg = "Photo not found"dashimage = dashimage.convert("1")epd.init()epd.Clear()epd.display(epd.getbuffer(dashimage))logger.info(log_msg)time.sleep(2)epd.sleep()logger.info("Completed photo display update")