Update crosses_left.overlay

Author: HeeTuic

config/boards/shields/crosses/crosses_left.overlay

@@ -18,3 +18,69 @@
 };
 
 
+
+
+
+// trackball bus
+&pinctrl {
+    spi0_default: spi0_default {
+        group1 {
+            psels = <NRF_PSEL(SPIM_SCK, 0, 17)>,
+                <NRF_PSEL(SPIM_MOSI, 0, 20)>,
+                <NRF_PSEL(SPIM_MISO, 0, 20)>;
+        };
+    };
+
+    spi0_sleep: spi0_sleep {
+        group1 {
+            psels = <NRF_PSEL(SPIM_SCK, 0, 17)>,
+                <NRF_PSEL(SPIM_MOSI, 0, 20)>,
+                <NRF_PSEL(SPIM_MISO, 0, 20)>;
+            low-power-enable;
+        };
+    };
+};
+
+#include <zephyr/dt-bindings/input/input-event-codes.h>
+
+&spi0 {
+    status = "okay";
+    compatible = "nordic,nrf-spim";
+    pinctrl-0 = <&spi0_default>;
+    pinctrl-1 = <&spi0_sleep>;
+    pinctrl-names = "default", "sleep";
+    cs-gpios = <&gpio1 0 GPIO_ACTIVE_LOW>;
+
+    trackball: trackball@0 {
+        status = "okay";
+        compatible = "pixart,pmw3610";
+        reg = <0>;
+        spi-max-frequency = <2000000>;
+        irq-gpios = <&gpio0 6 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
+        cpi = <600>;
+        // swap-xy; /* optional */
+        // invert-x; /* optional */
+        // invert-y; /* optional */
+        evt-type = <INPUT_EV_REL>;
+        x-input-code = <INPUT_REL_X>;
+        y-input-code = <INPUT_REL_Y>;
+
+        force-awake;
+        /* keep the sensor awake while ZMK activity state is ACTIVE,
+           fallback to normal downshift mode after ZMK goes into IDLE / SLEEP mode.
+           thus, the sensor would be a `wakeup-source` */
+
+        force-awake-4ms-mode;
+        /* while force-awake is acitvated, enable this mode to force sampling per 
+           4ms, where the default sampling rate is 8ms. */
+        /* NOTE: apply this mode if you need 250Hz with direct USB connection. */
+    };
+};
+
+/ {
+  trackball_listener {
+    compatible = "zmk,input-listener";
+    device = <&trackball>;
+  };
+};
+