C++ conversion (#80)

Converted project to C++

Boards/LilygoTdeck/keyboard.cpp

@@ -0,0 +1,86 @@
+#include "keyboard.h"
+#include "config.h"
+#include "lvgl.h"
+#include "TactilityCore.h"
+#include "Ui/LvglKeypad.h"
+#include <driver/i2c.h>
+
+#define TAG "tdeck_keyboard"
+
+typedef struct {
+    lv_indev_t* device;
+} KeyboardData;
+
+static inline esp_err_t keyboard_i2c_read(uint8_t* output) {
+    return i2c_master_read_from_device(
+        TDECK_KEYBOARD_I2C_BUS_HANDLE,
+        TDECK_KEYBOARD_SLAVE_ADDRESS,
+        output,
+        1,
+        configTICK_RATE_HZ / 10
+    );
+}
+
+void keyboard_wait_for_response() {
+    TT_LOG_I(TAG, "Waiting for keyboard response...");
+    bool awake = false;
+    uint8_t read_buffer = 0x00;
+    do {
+        awake = keyboard_i2c_read(&read_buffer) == ESP_OK;
+        if (!awake) {
+            tt::delay_ms(100);
+        }
+    } while (!awake);
+    TT_LOG_I(TAG, "Keyboard responded");
+}
+
+/**
+ * The callback simulates press and release events, because the T-Deck
+ * keyboard only publishes press events on I2C.
+ * LVGL currently works without those extra release events, but they
+ * are implemented for correctness and future compatibility.
+ *
+ * @param indev_drv
+ * @param data
+ */
+static void keyboard_read_callback(TT_UNUSED lv_indev_t* indev, lv_indev_data_t* data) {
+    static uint8_t last_buffer = 0x00;
+    uint8_t read_buffer = 0x00;
+
+    // Defaults
+    data->key = 0;
+    data->state = LV_INDEV_STATE_RELEASED;
+
+    if (keyboard_i2c_read(&read_buffer) == ESP_OK) {
+        if (read_buffer == 0 && read_buffer != last_buffer) {
+            TT_LOG_I(TAG, "Released %d", last_buffer);
+            data->key = last_buffer;
+            data->state = LV_INDEV_STATE_RELEASED;
+        } else if (read_buffer != 0) {
+            TT_LOG_I(TAG, "Pressed %d", read_buffer);
+            data->key = read_buffer;
+            data->state = LV_INDEV_STATE_PRESSED;
+        }
+    }
+
+    last_buffer = read_buffer;
+}
+
+Keyboard keyboard_alloc(_Nullable lv_disp_t* display) {
+    auto* data = static_cast<KeyboardData*>(malloc(sizeof(KeyboardData)));
+
+    data->device = lv_indev_create();
+    lv_indev_set_type(data->device, LV_INDEV_TYPE_KEYPAD);
+    lv_indev_set_read_cb(data->device, &keyboard_read_callback);
+    lv_indev_set_display(data->device, display);
+
+    tt::lvgl::keypad_set_indev(data->device);
+
+    return data;
+}
+
+void keyboard_free(Keyboard keyboard) {
+    auto* data = static_cast<KeyboardData*>(keyboard);
+    lv_indev_delete(data->device);
+    free(data);
+}