Merge pull request #313 from facchinm/led+arduinographics_fix

Arduino_LED_Matrix: add to CI and fix ArduinoGraphics begin()

Author: facchinm

.github/workflows/compile-examples.yml

@@ -87,11 +87,13 @@ jobs:
           - board:
               fqbn: "arduino:renesas_uno:unor4wifi"
             additional-sketch-paths: |
+              - libraries/Arduino_LED_Matrix
               - libraries/WiFiS3
               - libraries/OTAUpdate
           - board:
               fqbn: "arduino-git:renesas:unor4wifi"
             additional-sketch-paths: |
+              - libraries/Arduino_LED_Matrix
               - libraries/WiFiS3
               - libraries/OTAUpdate
               - libraries/OPAMP
@@ -157,6 +159,7 @@ jobs:
             - name: ArduinoDMX
             - name: ArduinoRS485
             - name: ArduinoIoTCloud
+            - name: ArduinoGraphics
           platforms: |
             # Use Board Manager to install the latest release of Arduino Renesas Boards to get the toolchain
             - name: "arduino:renesas_uno"

libraries/Arduino_LED_Matrix/src/Arduino_LED_Matrix.h

@@ -169,7 +169,7 @@ class ArduinoLEDMatrix
     void off(size_t pin) {
         turnLed(pin, false);
     }
-    bool begin() {
+    int begin() {
         bool rv = true;
         uint8_t type;
         int8_t ch = FspTimer::get_available_timer(type);