zmk: add screen to left half

firmware/zmk-config/boards/shields/phiboard/Kconfig.defconfig

@@ -19,6 +19,9 @@ if SHIELD_PHIBOARD_LEFT
 config ZMK_KEYBOARD_NAME
     default "phiboard slave"
 
+config ZMK_DISPLAY
+    default y
+
 endif
 
 if SHIELD_PHIBOARD_LEFT || SHIELD_PHIBOARD_RIGHT

firmware/zmk-config/boards/shields/phiboard/phiboard_left.overlay

@@ -3,14 +3,15 @@
 / {
     chosen {
         zmk,kscan = &kscan0;
+        zephyr,display = &oled_left;
     };
 
+
     kscan0: kscan_0 {
         compatible = "zmk,kscan-gpio-matrix";
         label = "KSCAN";
         diode-direction = "col2row";
 
-
         col-gpios
             = <&xiao_d 10 GPIO_ACTIVE_HIGH>
             , <&xiao_d 9 GPIO_ACTIVE_HIGH>
@@ -26,5 +27,28 @@
             , <&xiao_d 3 (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>
             ;
     };
-
 };
+
+
+&xiao_i2c {
+    status = "okay";
+
+    oled_left: ssd1306@3c {
+        status = "okay";
+
+        compatible = "solomon,ssd1306fb";
+        reg = <0x3c>;
+        width = <128>;
+        height = <80>;
+        segment-offset = <0>;
+        page-offset = <0>;
+        display-offset = <0>;
+        multiplex-ratio = <31>;
+        //segment-remap;
+        //com-invdir;
+        com-sequential;
+        inversion-on;
+        prechargep = <0x22>;
+    };
+};
+

firmware/zmk-config/phiboard.conf

@@ -11,4 +11,7 @@ CONFIG_ZMK_KSCAN_DEBOUNCE_RELEASE_MS=10
 
 CONFIG_ZMK_WIDGET_LAYER_STATUS=y
 CONFIG_ZMK_WIDGET_BATTERY_STATUS=y
-CONFIG_ZMK_WIDGET_OUTPUT_STATUS=y
+CONFIG_ZMK_WIDGET_OUTPUT_STATUS=y # Shows if USB/BLE is active
+#CONFIG_ZMK_DISPLAY_INVERT=n
+#CONFIG_ZMK_WIDGET_WPM_STATUS=y
+#CONFIG_ZMK_DISPLAY_STATUS_SCREEN_CUSTOM=y