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MXC-A36/xrz/lv_drivers/indev/keyboard.c

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+/**
+ * @file sdl_kb.c
+ *
+ */
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "keyboard.h"
+#if USE_KEYBOARD
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ *  STATIC PROTOTYPES
+ **********************/
+static uint32_t keycode_to_ascii(uint32_t sdl_key);
+
+/**********************
+ *  STATIC VARIABLES
+ **********************/
+static uint32_t last_key;
+static lv_indev_state_t state;
+
+/**********************
+ *      MACROS
+ **********************/
+
+/**********************
+ *   GLOBAL FUNCTIONS
+ **********************/
+
+/**
+ * Initialize the keyboard
+ */
+void keyboard_init(void)
+{
+    /*Nothing to init*/
+}
+
+/**
+ * Get the last pressed or released character from the PC's keyboard
+ * @param indev_drv pointer to the related input device driver
+ * @param data store the read data here
+ * @return false: because the points are not buffered, so no more data to be read
+ */
+void keyboard_read(lv_indev_drv_t * indev_drv, lv_indev_data_t * data)
+{
+    (void) indev_drv;      /*Unused*/
+    data->state = state;
+    data->key = keycode_to_ascii(last_key);
+}
+
+/**
+ * It is called periodically from the SDL thread to check a key is pressed/released
+ * @param event describes the event
+ */
+void keyboard_handler(SDL_Event * event)
+{
+    /* We only care about SDL_KEYDOWN and SDL_KEYUP events */
+    switch(event->type) {
+        case SDL_KEYDOWN:                       /*Button press*/
+            last_key = event->key.keysym.sym;   /*Save the pressed key*/
+            state = LV_INDEV_STATE_PRESSED;          /*Save the key is pressed now*/
+            break;
+        case SDL_KEYUP:                         /*Button release*/
+            state = LV_INDEV_STATE_RELEASED;         /*Save the key is released but keep the last key*/
+            break;
+        default:
+            break;
+
+    }
+}
+
+/**********************
+ *   STATIC FUNCTIONS
+ **********************/
+
+/**
+ * Convert the key code LV_KEY_... "codes" or leave them if they are not control characters
+ * @param sdl_key the key code
+ * @return
+ */
+static uint32_t keycode_to_ascii(uint32_t sdl_key)
+{
+    /*Remap some key to LV_KEY_... to manage groups*/
+    switch(sdl_key) {
+        case SDLK_RIGHT:
+        case SDLK_KP_PLUS:
+            return LV_KEY_RIGHT;
+
+        case SDLK_LEFT:
+        case SDLK_KP_MINUS:
+            return LV_KEY_LEFT;
+
+        case SDLK_UP:
+            return LV_KEY_UP;
+
+        case SDLK_DOWN:
+            return LV_KEY_DOWN;
+
+        case SDLK_ESCAPE:
+            return LV_KEY_ESC;
+
+#ifdef  LV_KEY_BACKSPACE        /*For backward compatibility*/
+        case SDLK_BACKSPACE:
+            return LV_KEY_BACKSPACE;
+#endif
+
+#ifdef  LV_KEY_DEL        /*For backward compatibility*/
+        case SDLK_DELETE:
+            return LV_KEY_DEL;
+#endif
+        case SDLK_KP_ENTER:
+        case '\r':
+            return LV_KEY_ENTER;
+
+        case SDLK_PAGEDOWN:
+            return LV_KEY_NEXT;
+
+        case SDLK_PAGEUP:
+            return LV_KEY_PREV;
+
+        default:
+            return sdl_key;
+    }
+}
+#endif