Add other display support via luma.emulator

Signed-off-by: Rahul Thakoor <[email protected]>

CHANGELOG.md

@@ -4,6 +4,13 @@ All notable changes to this project will be documented in this file
 automatically by Versionist. DO NOT EDIT THIS FILE MANUALLY!
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+# v0.1.0
+## (2021-08-04)
+
+* Add support for non-oled displays via luma.emulator [Rahul Thakoor]
+    - Container size increased to ~200MB with this support
+* Simplified dependency resolving for apt
+
 # v0.0.14
 ## (2021-07-29)
 

Dockerfile.template

@@ -2,30 +2,45 @@ FROM balenalib/%%BALENA_MACHINE_NAME%%-debian-python:3.7-buster-run AS builder
 
 WORKDIR /usr/src/app
 
-RUN mkdir -p /usr/src/debian-rootfs
+# make folder readable by other users -> _apt can access some deb files otherwise
+RUN chmod 777 /usr/src/app
 
-RUN install_packages apt-rdepends
+RUN mkdir -p /usr/src/debian-rootfs 
 
-RUN apt-get update && \
-        apt-get download \
-        $(apt-rdepends python3 libopenjp2-7 libfreetype6-dev libjpeg-dev libtiff5 libxcb1 | grep -v "^ " | sed 's/debconf-2.0/debconf/g' | sed 's/^libc-dev$/libc6-dev/g' | sed 's/^libz-dev$/zlib1g-dev/g')
+RUN install_packages apt-rdepends build-essential
 
+# list of packages to be installed in rootfs we will use in next stage
+ARG PACKAGES="tzdata python3 python3-pygame libopenjp2-7 libfreetype6-dev libjpeg-dev libtiff5 libxcb1"
+
+# download all packages and dependencies
+RUN apt update && apt-get download $(apt-cache depends --recurse --no-recommends --no-suggests --no-conflicts --no-breaks --no-replaces --no-enhances ${PACKAGES} | grep "^\w" | sort -u)
+
+# install packages to separate rootfs
 RUN for pkg in *.deb; \
       do dpkg-deb  -x $pkg /usr/src/debian-rootfs; \
       done
 
 COPY ./requirements.txt .
-RUN pip install -t /usr/src/python-packages -r requirements.txt --no-cache-dir --extra-index-url=https://www.piwheels.org/simple
 
+RUN pip install -t /usr/src/python-packages -r requirements.txt --extra-index-url=https://www.piwheels.org/simple
+
+# download luma.emulator separately without pygame(installed from debian source) -> if same directory, pip throws err: Target directory exists
+RUN pip install -t /usr/src/luma-emulator luma.emulator --no-deps --ignore-installed --no-cache-dir --extra-index-url=https://www.piwheels.org/simple
+
+RUN cp -rf /usr/src/luma-emulator/luma/emulator /usr/src/python-packages/luma
 
-FROM busybox:stable
 
 
+FROM busybox:stable
+
 COPY --from=builder /usr/src/debian-rootfs ./
-COPY --from=builder /usr/src/python-packages/ /usr/src/python-packages/
+
+COPY --from=builder /usr/src/python-packages/ /usr/src/python-packages
 
 COPY src ./src
+
 COPY VERSION ./
 
 ENV PYTHONPATH=/usr/src/python-packages/
+
 CMD ["python3", "src/main.py"]

README.md

@@ -41,6 +41,7 @@ These environment variables are specified using the [balenaCloud dashboard](http
 |`transportApi_apiKey` | `798c7ddfdeadbeef87987e9a8e79` (transport API key)
 |`transportApi_appId` | `12345678` (transport API application ID)
 |`transportApi_operatingHours` | `8-22` (hours during which the data will refresh at the interval above)
+|`DISPLAY_DEVICE` | `SSD1322`(default) or `MONITOR`
 
 ## Hardware
 

VERSION

@@ -1 +1 @@
-0.0.14
+0.1.0

balena.yml

@@ -21,10 +21,11 @@ data:
     - raspberrypi3
   applicationEnvironmentVariables:
     - TZ: Europe/London
+    - DISPLAY_DEVICE: SSD1322
     - departureStation: PAD
     - outOfHoursName: London Paddington
     - refreshTime: 120
     - transportApi_apiKey: UPDATE_ME
     - transportApi_appId: UPDATE_ME
     - transportApi_operatingHours: 8-22
-version: 0.0.14
+version: 0.1.0

src/config.py

@@ -7,6 +7,7 @@ def loadConfig():
     }
 
     data["refreshTime"] = int(os.getenv("refreshTime") or 180)
+    data["display"] = os.getenv("DISPLAY_DEVICE") or "SSD1322"
 
     data["journey"]["departureStation"] = os.getenv("departureStation") or "PAD"
     data["journey"]["destinationStation"] = os.getenv("destinationStation") or None

src/main.py

@@ -18,6 +18,8 @@
 from luma.core.virtual import viewport, snapshot, hotspot
 from luma.core.sprite_system import framerate_regulator
 
+from luma.emulator.device import pygame as emulator
+
 def makeFont(name, size):
     font_path = os.path.abspath(
         os.path.join(
@@ -258,16 +260,24 @@ def drawSignage(device, width, height, data):
     print('Starting Train Departure Display v' + version_file.read())
     config = loadConfig()
 
-    serial = spi()
-    device = ssd1322(serial, mode="1", rotate=2)
+    device = None
+    widgetWidth = 256 
+    widgetHeight = 64 
+
+    if config["display"] == "SSD1322":
+        serial = spi()
+        device = ssd1322(serial, mode="1", rotate=2)
+    elif config["display"] == "MONITOR":
+        device = emulator(width=widgetWidth, height=widgetHeight,frame_rate=20)
+        device._pygame.mouse.set_visible(False)
+
+    if device == None:
+        sys.exit(1)
     font = makeFont("Dot Matrix Regular.ttf", 10)
     fontBold = makeFont("Dot Matrix Bold.ttf", 10)
     fontBoldTall = makeFont("Dot Matrix Bold Tall.ttf", 10)
     fontBoldLarge = makeFont("Dot Matrix Bold.ttf", 20)
-
-    widgetWidth = 256
-    widgetHeight = 64
-
+
     stationRenderCount = 0
     pauseCount = 0
     loop_count = 0
@@ -308,3 +318,6 @@ def drawSignage(device, width, height, data):
     print(f"Error: {err}")
 except KeyError as err:
     print(f"Error: Please ensure the {err} environment variable is set")
+except:
+    print('Unexpected Error')
+