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