Add reboot, poweroff, debug screens to lcd_control
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@ -2,6 +2,12 @@
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The below will setup an Adafruit mini LCD with 2 buttons as a controller for selecting which photo albums are displayed on a PiFrame. This setup also includes the Adafruit stemma/qwiic LUX sensor setup which will be integrated further in the future.
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Please note:
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- Single button presses need about 1/4 of a second to register
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- Holding 'Up' for at least 3 seconds will trigger a prompt to reboot
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- Holding 'Down' for at least 3 seconds will trigger a prompt to power off
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- If you hold 'Down' on the reboot or power off prompts a debug menu will be displayed
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``` sh
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apt install -y python3-pip ttf-dejavu python3-pil python3-numpy
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356
lcd_control.py
356
lcd_control.py
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@ -1,28 +1,40 @@
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#!/usr/bin/python3
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# -*- coding: utf-8 -*-
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####################
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#!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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# IMPORTANT CONSIDERATIONS
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# - Button presses may be missed if you push/release too fast
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# - Button presses read most reliably after about 0.25 seconds being held down
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#!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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########################################
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# Inspiration / Further Reading
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####################
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########################################
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# https://circuitpython.readthedocs.io/projects/bh1750/en/latest/
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# https://raspi.tv/2013/how-to-use-interrupts-with-python-on-the-raspberry-pi-and-rpi-gpio-part-3
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# https://stackoverflow.com/questions/16148735/how-to-implement-a-watchdog-timer-in-python
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# https://learn.adafruit.com/adafruit-bh1750-ambient-light-sensor
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# https://learn.adafruit.com/adafruit-mini-pitft-135x240-color-tft-add-on-for-raspberry-pi/overview
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########################################
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# Imports and whatnot
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########################################
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import adafruit_bh1750
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import adafruit_rgb_display.st7789 as st7789
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import board
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import busio
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import dbus
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import digitalio
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import os
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import time
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from threading import Timer
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from PIL import Image, ImageDraw, ImageFont
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import RPi.GPIO as GPIO
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import adafruit_rgb_display.st7789 as st7789
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import adafruit_bh1750
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import time
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from datetime import datetime
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from PIL import Image, ImageDraw, ImageFont
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from threading import Timer
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# Generic watchdog timer used for backlight controls
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########################################
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# Generic watchdog timer class
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########################################
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class Watchdog:
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def __init__(self, timeout, userHandler=None): # timeout in seconds
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self.timeout = timeout
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@ -43,7 +55,9 @@ class Watchdog:
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def defaultHandler(self):
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raise self
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########################################
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# Cheat for walking only one level deep via os.walk (faster than other options)
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########################################
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def walklevel(some_dir, level=1):
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some_dir = some_dir.rstrip(os.path.sep)
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assert os.path.isdir(some_dir)
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@ -54,26 +68,38 @@ def walklevel(some_dir, level=1):
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if num_sep + level <= num_sep_this:
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del dirs[:]
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########################################
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# bh1740 lux sensor
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########################################
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i2c = busio.I2C(board.SCL, board.SDA)
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sensor = adafruit_bh1750.BH1750(i2c)
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########################################
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# Configuration for CS and DC pins (these are FeatherWing defaults on M0/M4):
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########################################
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cs_pin = digitalio.DigitalInOut(board.CE0)
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dc_pin = digitalio.DigitalInOut(board.D25)
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reset_pin = None
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########################################
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# Setup button pins as inputs
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########################################
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GPIO.setup(23, GPIO.IN)
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GPIO.setup(24, GPIO.IN)
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# Config for display baudrate (default max is 24mhz):
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########################################
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# Config for display baudrate (default max is 24mhz)
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########################################
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BAUDRATE = 64000000
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# Setup SPI bus using hardware SPI:
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########################################
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# Setup SPI bus using hardware SPI
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########################################
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spi = board.SPI()
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# Create the ST7789 display:
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########################################
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# Create the ST7789 display
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########################################
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disp = st7789.ST7789(
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spi,
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cs=cs_pin,
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@ -86,43 +112,59 @@ disp = st7789.ST7789(
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y_offset=40,
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)
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########################################
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# Create blank image for drawing.
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# Make sure to create image with mode 'RGB' for full color.
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########################################
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height = disp.width # we swap height/width to rotate it to landscape!
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width = disp.height
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image = Image.new('RGB', (width, height))
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rotation = 90
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########################################
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# Get drawing object to draw on image.
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########################################
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draw = ImageDraw.Draw(image)
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# Draw a black filled box to clear the image.
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########################################
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# Draw a black filled box to clear the image
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########################################
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draw.rectangle((0, 0, width, height), outline=0, fill=(0, 0, 0))
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disp.image(image, rotation)
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# Draw some shapes.
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########################################
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# Draw some shapes
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# First define some constants to allow easy resizing of shapes.
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########################################
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padding = -2
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top = padding
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bottom = height - padding
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########################################
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# Move left to right keeping track of the current x position for drawing shapes.
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########################################
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x = 0
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# Alternatively load a TTF font. Make sure the .ttf font file is in the
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# same directory as the python script!
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# Some other nice fonts to try: http://www.dafont.com/bitmap.php
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#font = ImageFont.truetype('/usr/share/fonts/truetype/dejavu/DejaVuSansMono-Bold.ttf', 24)
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font_small = font = ImageFont.truetype('/usr/share/fonts/truetype/dejavu/DejaVuSansMono-Bold.ttf', 24)
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########################################
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# Load fonts used for output on screen
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########################################
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font_small = ImageFont.truetype('/usr/share/fonts/truetype/dejavu/DejaVuSansMono-Bold.ttf', 24)
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font_medium = ImageFont.truetype('/usr/share/fonts/truetype/dejavu/DejaVuSansMono-Bold.ttf', 36)
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font = ImageFont.truetype('/usr/share/fonts/truetype/dejavu/DejaVuSansMono-Bold.ttf', 48)
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########################################
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# Turn on the backlight
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########################################
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backlight = digitalio.DigitalInOut(board.D22)
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backlight.switch_to_output()
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backlight.value = True
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########################################
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# Watchdog timer for screen on/off control based on button presses
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# Turns off screen 10s after last button press
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# Turns on screen for 10s when starting up
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# Restart fim slideshow when the screen blanks so there is an indicator when it's going to change the selection
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########################################
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def backlight_callback():
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global backlight
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backlight.value = False
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@ -131,9 +173,14 @@ def backlight_callback():
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manager = dbus.Interface(systemd1, 'org.freedesktop.systemd1.Manager')
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job = manager.RestartUnit('fim.service', 'fail')
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########################################
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# Setup screen off watchdog
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########################################
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watchdog = Watchdog(10.0, backlight_callback)
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########################################
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# Figure out which albums are present as well as the special 'All' album
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########################################
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albums = [ 'All' ]
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selected_album = 0
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try:
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@ -150,13 +197,17 @@ for root, dirs, files in walklevel('/tank/pictures'):
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albums.append(folder)
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albums.sort()
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# Method for drawing on the screen
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# Called by the button handlers since we don't need anything more than a basic while(1) main for this setup
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def refresh_screen():
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global width, height, x, y, top, draw, selected_album, albums, font, font_small
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########################################
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# Track which UI screen is shown
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########################################
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current_ui = 'main'
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# Draw a black filled box to clear the image.
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draw.rectangle((0, 0, width, height), outline=0, fill=0)
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########################################
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# Draw main UI
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########################################
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def draw_main_ui():
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global width, height, x, y, top, draw, selected_album, albums, font, current_ui
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current_ui = 'main'
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# Split the line on spaces and then add a blank line if needed to avoid crashes
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text_lines = albums[selected_album].split(' ')
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@ -168,14 +219,154 @@ def refresh_screen():
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draw.text((x, y), text_lines[0], font=font, fill='#DCDCDC')
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y += font.getsize('0')[1]
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draw.text((x, y), text_lines[1], font=font, fill='#DCDCDC')
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lux = 'Light: %.2f Lux' % sensor.lux
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y = height - font_small.getsize(lux)[1]
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draw.text((x, y), lux, font=font_small, fill='#DCDCDC')
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pos = 'Position: %d/%d' % (selected_album + 1, len(albums))
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y = height - font_small.getsize(pos)[1]
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draw.text((x, y), pos, font=font_small, fill='#DCDCDC')
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# Display image.
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disp.image(image, rotation)
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########################################
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# Draw yes/no labels
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########################################
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def draw_yes_no_labels():
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global width, height, x, y, top, draw, font_medium
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# Yes
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draw.text((x, top+15), 'Yes', font=font_medium, fill='#DCDCDC')
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# No
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y = height - font_medium.getsize('No')[1]
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draw.text((x, y-15), 'No', font=font_medium, fill='#DCDCDC')
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# Display image.
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disp.image(image, rotation)
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########################################
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# Draw rebootING UI
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########################################
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def draw_rebooting_ui():
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global width, height, x, y, top, draw, font_medium, current_ui
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current_ui = 'rebooting'
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font_size = font_medium.getsize('0')
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left = x + font_size[0]
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y = (height / 2) - (font_size[1] / 2)
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draw.text((left, y), 'Rebooting', font=font_medium, fill='#DCDCDC')
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disp.image(image, rotation)
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########################################
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# Draw reboot UI
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########################################
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def draw_reboot_ui():
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global width, height, x, y, top, draw, font_medium, current_ui
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current_ui = 'reboot'
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draw_yes_no_labels()
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font_size = font_medium.getsize('Yes ')
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left = x + font_size[0]
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y = (height / 2) - (font_size[1] / 2)
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draw.text((left, y), 'Reboot', font=font_medium, fill='#DCDCDC')
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disp.image(image, rotation)
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########################################
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# Draw powerING off UI
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########################################
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def draw_poweringoff_ui():
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global width, height, x, y, top, draw, font_medium, current_ui
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current_ui = 'poweringoff'
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font_size = font_medium.getsize('0')
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left = x + font_size[0]
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y = (height / 2) - font_size[1]
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draw.text((left, y), 'Powering', font=font_medium, fill='#DCDCDC')
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y += font_size[1]
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left += font_medium.getsize('00')[0]
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draw.text((left, y), 'Off', font=font_medium, fill='#DCDCDC')
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disp.image(image, rotation)
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########################################
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# Draw poweroff UI
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########################################
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def draw_poweroff_ui():
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global width, height, x, y, top, draw, font_medium, current_ui
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current_ui = 'poweroff'
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draw_yes_no_labels()
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font_size = font_medium.getsize('Yes ')
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left = x + font_size[0]
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y = (height / 2) - font_size[1]
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draw.text((left, y), 'Power', font=font_medium, fill='#DCDCDC')
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y += font_size[1]
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left += font_medium.getsize('0')[0]
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draw.text((left, y), 'Off', font=font_medium, fill='#DCDCDC')
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disp.image(image, rotation)
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########################################
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# Draw debug UI
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########################################
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def draw_debug_ui():
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global width, height, x, y, top, draw, font_small, current_ui
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import subprocess
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current_ui = 'debug'
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ip_cmd = '/usr/sbin/ip'
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process = subprocess.run([ip_cmd, '-o', 'link', 'show'], stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True)
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addresses = []
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for line in process.stdout.split('\n'):
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if line == '':
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continue
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values = line.split(':')
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adapter = values[1].strip()
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if adapter != 'lo' and not 'wg' in adapter:
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addr = subprocess.run([ip_cmd, '-f', 'inet', '-o', 'addr', 'show', adapter], stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True)
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addr = addr.stdout.split()
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if len(addr) >=4:
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addresses.append(addr[3].split('/')[0])
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# Write some text
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lux = 'Light: %.2f Lux' % sensor.lux
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y = top
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draw.text((x, y), lux, font=font_small, fill='#DCDCDC')
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for addr in addresses:
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y += font_small.getsize('0')[1]
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draw.text((x, y), addr, font=font_small, fill='#DCDCDC')
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# Display image.
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disp.image(image, rotation)
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########################################
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# Method for drawing on the screen
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# Called by the button handlers since we don't need anything more than a basic while(1) main for this setup
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########################################
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def refresh_screen(screen):
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global draw, width, height
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# Draw a black filled box to clear the image.
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draw.rectangle((0, 0, width, height), outline=0, fill=0)
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if screen == 'main':
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draw_main_ui()
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elif screen == 'debug':
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draw_debug_ui()
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elif screen == 'reboot':
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draw_reboot_ui()
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elif screen == 'poweroff':
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draw_poweroff_ui()
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elif screen == 'rebooting':
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draw_rebooting_ui()
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elif screen == 'poweringoff':
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draw_poweringoff_ui()
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########################################
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# Write current album when restarting the slideshow
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########################################
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def write_selected_album():
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with open('/etc/default/fim_album_index', 'w') as f:
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f.write(str(selected_album))
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@ -185,38 +376,111 @@ def write_selected_album():
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else:
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f.write('/tank/pictures')
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########################################
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# Button held tracking date/times
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########################################
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up_held_rising = None
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dn_held_rising = None
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btn_is_prompting = False
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########################################
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# Interrupt callback for changing albums (up)
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########################################
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def up_button(channel):
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global selected_album, albums, backlight
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global selected_album, albums, backlight, up_held_rising, btn_is_prompting, current_ui
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backlight.value = True
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selected_album += 1
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if selected_album >= len(albums):
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selected_album = 0
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refresh_screen()
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write_selected_album()
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watchdog.reset()
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# Pull ups on the LCD flip the standard logic you're expecting
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# Button Released
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if not GPIO.input(channel):
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up_held_rising = datetime.now()
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# Button pressed
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else:
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if btn_is_prompting:
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if current_ui == 'debug':
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btn_is_prompting = False
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up_held_rising = None
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refresh_screen('main')
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return
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if current_ui == 'reboot':
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refresh_screen('rebooting')
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os.system('/usr/bin/systemctl reboot')
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elif current_ui == 'poweroff':
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refresh_screen('poweringoff')
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os.system('/usr/bin/systemctl poweroff')
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btn_is_prompting = False
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return
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if up_held_rising is not None:
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now = datetime.now()
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diff = (now - up_held_rising).total_seconds()
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if diff >= 3:
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up_held_rising = None
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btn_is_prompting = True
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refresh_screen('reboot')
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return
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selected_album += 1
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if selected_album >= len(albums):
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selected_album = 0
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refresh_screen('main')
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write_selected_album()
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watchdog.reset()
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########################################
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# Interrupt callback for changing albums (dn)
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########################################
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def dn_button(channel):
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global selected_album, albums, backlight
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global selected_album, albums, backlight, dn_held_rising, btn_is_prompting
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backlight.value = True
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selected_album -= 1
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if selected_album < 0:
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selected_album = len(albums) - 1
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refresh_screen()
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write_selected_album()
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watchdog.reset()
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# Pull ups on the LCD flip the standard logic you're expecting
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# Button released
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if not GPIO.input(channel):
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dn_held_rising = datetime.now()
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# Button pressed
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else:
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if btn_is_prompting:
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# Show debug menu if long pressed dn on reboot/shutdown screens
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if dn_held_rising is not None:
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now = datetime.now()
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diff = (now - dn_held_rising).total_seconds()
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if diff >= 3:
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dn_held_rising = None
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btn_is_prompting = True
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refresh_screen('debug')
|
||||
return
|
||||
btn_is_prompting = False
|
||||
refresh_screen('main')
|
||||
if dn_held_rising is not None:
|
||||
now = datetime.now()
|
||||
diff = (now - dn_held_rising).total_seconds()
|
||||
if diff >= 3:
|
||||
dn_held_rising = None
|
||||
btn_is_prompting = True
|
||||
refresh_screen('poweroff')
|
||||
return
|
||||
selected_album -= 1
|
||||
if selected_album < 0:
|
||||
selected_album = len(albums) - 1
|
||||
refresh_screen('main')
|
||||
write_selected_album()
|
||||
watchdog.reset()
|
||||
|
||||
########################################
|
||||
# Setup button interrupts
|
||||
GPIO.add_event_detect(23, GPIO.FALLING, callback=up_button, bouncetime=300)
|
||||
GPIO.add_event_detect(24, GPIO.FALLING, callback=dn_button, bouncetime=300)
|
||||
########################################
|
||||
GPIO.add_event_detect(23, GPIO.BOTH, callback=up_button, bouncetime=250)
|
||||
GPIO.add_event_detect(24, GPIO.BOTH, callback=dn_button, bouncetime=250)
|
||||
|
||||
########################################
|
||||
# Draw initial screen state
|
||||
refresh_screen()
|
||||
########################################
|
||||
refresh_screen(current_ui)
|
||||
|
||||
########################################
|
||||
# Kick off watchdog to start the 10s initial 'on' status
|
||||
########################################
|
||||
watchdog.reset()
|
||||
|
||||
# Work with the LCD / Buttons in an infinate loop
|
||||
########################################
|
||||
# We use watchdogs/interrupts for ALL operations, no need for anything in a main loop other than keeping the app alive
|
||||
########################################
|
||||
while True:
|
||||
time.sleep(300)
|
||||
|
|
|
|||
Loading…
Reference in a new issue