JS: Flipboard

js/flipboard/scripts/fb_button_api.js

@@ -0,0 +1,55 @@
+({
+    gpio: require("gpio"),
+    button_pins: ["PB2", "PB3", "PA4", "PA6"],
+    repeat: false,
+    init: function () {
+        for (let i = 0; i < this.button_pins.length; i++) {
+            this.gpio.init(this.button_pins[i], "input", "up");
+        }
+    },
+    getButtons: function () {
+        let n = 0;
+        for (let i = 0; i < this.button_pins.length; i++) {
+            let isPressed = !this.gpio.read(this.button_pins[i]);
+            n += isPressed ? 1 << i : 0;
+        }
+
+        return n;
+    },
+    debounceButton: function (button) {
+        let threshold = 3;
+        let repeatThreshold = 5;
+        let debounce = { counter: threshold, button: button & ~16 };
+        while (true) {
+            let button = this.getButtons();
+            if (button !== debounce.button) {
+                debounce.counter = 0;
+                debounce.button = button;
+                continue;
+            } else {
+                debounce.counter++;
+                if (debounce.counter === threshold) {
+                    break;
+                } else if (debounce.counter < threshold) {
+                    continue;
+                } else if (debounce.counter > threshold) {
+                    if (this.repeat && debounce.counter > repeatThreshold) {
+                        debounce.button |= 16;
+                        break;
+                    }
+                    delay(1);
+                    continue;
+                }
+            }
+        }
+
+        return debounce.button;
+    },
+    buttonNumberToArray: function (button_number) {
+        let binary_array = [];
+        for (let i = 0; i < this.button_pins.length; i++) {
+            binary_array.push((button_number >> i) & 1);
+        }
+        return binary_array;
+    }
+})