Added Espressif esp32 code for CAN/TWAI integration and display functionality

twai_can_receiver/.gitignore

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+build/
+managed_components/
+.vscode/

twai_can_receiver/CMakeLists.txt

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+# The following lines of boilerplate have to be in your project's CMakeLists
+# in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.16)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(twai_network_slave)

twai_can_receiver/README.md

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+# TWAI/CAN Receiver Code
+ESP32 code for the CAN receiver. Also connects to a display using I2C and draws graphics with lvgl.
+
+## Setup
+If ESP-IDF is not installed, follow [espressif's installation guide.](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/get-started/index.html)
+
+
+If ESP-IDF is installed, run
+```
+. $HOME/esp/esp-idf/export.sh
+cd <project-directory>
+idf.py set-target esp32
+idf.py add-dependency "espressif/esp_lvgl_port^2.3.0"
+idf.py menuconfig
+```
+In menuconfig,
+ Component config --> LVGL Configuration --> Font usage --> Enable built-in fonts  --> Enable Montserrat 32
+this will enable the larger font size. Then click S to save and Q to exit menuconfig. 
+Then run,
+```
+idf.py build
+idf.py -p <PORT> flash monitor
+```
+

twai_can_receiver/dependencies.lock

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+dependencies:
+  espressif/esp_lvgl_port:
+    component_hash: ff682937ac7f94653e45719f888db637830e90dd0ba3ff5b72d2c808c7a93949
+    dependencies:
+    - name: idf
+      require: private
+      version: '>=4.4'
+    - name: lvgl/lvgl
+      registry_url: https://components.espressif.com
+      require: public
+      version: '>=8,<10'
+    source:
+      registry_url: https://components.espressif.com/
+      type: service
+    version: 2.4.1
+  idf:
+    source:
+      type: idf
+    version: 5.4.0
+  lvgl/lvgl:
+    component_hash: d7c1ac037ae6e85d94897f807d6e7ba0946a83e720074fc95a4f6241da9f9f53
+    dependencies: []
+    source:
+      registry_url: https://components.espressif.com/
+      type: service
+    version: 8.4.0
+direct_dependencies:
+- espressif/esp_lvgl_port
+- idf
+- lvgl/lvgl
+manifest_hash: 4d22193101c18ee11370590bf1a5f7be65523ee18360c0c216a4ab2d8922b03e
+target: esp32
+version: 2.0.0

twai_can_receiver/main/CMakeLists.txt

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+idf_component_register(SRCS "twai_network_example_slave_main.c"
+                    INCLUDE_DIRS ".")

twai_can_receiver/main/Kconfig.projbuild

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+menu "Example Configuration"
+
+    config EXAMPLE_TX_GPIO_NUM
+        int "TX GPIO number"
+        default 21 if IDF_TARGET_ESP32
+        default 0
+        help
+            This option selects the GPIO pin used for the TX signal. Connect the
+            TX signal to your transceiver.
+
+    config EXAMPLE_RX_GPIO_NUM
+        int "RX GPIO number"
+        default 22 if IDF_TARGET_ESP32
+        default 2
+        help
+            This option selects the GPIO pin used for the RX signal. Connect the
+            RX signal to your transceiver.
+
+endmenu

twai_can_receiver/main/idf_component.yml

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+## IDF Component Manager Manifest File
+dependencies:
+  espressif/esp_lvgl_port: "^2.4.1"
+  ## Required IDF version
+  idf:
+    version: ">=4.1.0"
+  lvgl/lvgl: ^8
+
+  # # Put list of dependencies here
+  # # For components maintained by Espressif:
+  # component: "~1.0.0"
+  # # For 3rd party components:
+  # username/component: ">=1.0.0,<2.0.0"
+  # username2/component2:
+  #   version: "~1.0.0"
+  #   # For transient dependencies `public` flag can be set.
+  #   # `public` flag doesn't have an effect dependencies of the `main` component.
+  #   # All dependencies of `main` are public by default.
+  #   public: true