136 lines
3.1 KiB
C
136 lines
3.1 KiB
C
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/**
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* @file hal_indev.c
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*
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* @description Input device HAL interface
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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 "../lv_hal/lv_hal_indev.h"
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#include "../lv_misc/lv_mem.h"
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#include "../lv_misc/lv_gc.h"
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#if defined(LV_GC_INCLUDE)
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# include LV_GC_INCLUDE
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#endif /* LV_ENABLE_GC */
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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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/**********************
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* STATIC VARIABLES
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**********************/
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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 an input device driver with default values.
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* It is used to surly have known values in the fields ant not memory junk.
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* After it you can set the fields.
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* @param driver pointer to driver variable to initialize
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*/
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void lv_indev_drv_init(lv_indev_drv_t * driver)
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{
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driver->read = NULL;
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driver->type = LV_INDEV_TYPE_NONE;
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driver->user_data = NULL;
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}
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/**
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* Register an initialized input device driver.
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* @param driver pointer to an initialized 'lv_indev_drv_t' variable (can be local variable)
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* @return pointer to the new input device or NULL on error
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*/
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lv_indev_t * lv_indev_drv_register(lv_indev_drv_t * driver)
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{
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lv_indev_t * node;
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node = lv_mem_alloc(sizeof(lv_indev_t));
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if(!node) return NULL;
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memset(node, 0, sizeof(lv_indev_t));
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memcpy(&node->driver, driver, sizeof(lv_indev_drv_t));
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node->next = NULL;
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node->proc.reset_query = 1;
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node->cursor = NULL;
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node->group = NULL;
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node->btn_points = NULL;
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if(LV_GC_ROOT(_lv_indev_list) == NULL) {
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LV_GC_ROOT(_lv_indev_list) = node;
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} else {
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lv_indev_t * last = LV_GC_ROOT(_lv_indev_list);
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while(last->next)
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last = last->next;
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last->next = node;
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}
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return node;
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}
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/**
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* Get the next input device.
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* @param indev pointer to the current input device. NULL to initialize.
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* @return the next input devise or NULL if no more. Give the first input device when the parameter is NULL
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*/
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lv_indev_t * lv_indev_next(lv_indev_t * indev)
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{
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if(indev == NULL) {
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return LV_GC_ROOT(_lv_indev_list);
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} else {
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if(indev->next == NULL) return NULL;
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else return indev->next;
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}
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}
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/**
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* Read data from an input device.
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* @param indev pointer to an input device
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* @param data input device will write its data here
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* @return false: no more data; true: there more data to read (buffered)
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*/
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bool lv_indev_read(lv_indev_t * indev, lv_indev_data_t * data)
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{
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bool cont = false;
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memset(data, 0, sizeof(lv_indev_data_t));
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data->state = LV_INDEV_STATE_REL;
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if(indev->driver.read) {
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data->user_data = indev->driver.user_data;
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LV_LOG_TRACE("idnev read started");
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cont = indev->driver.read(data);
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LV_LOG_TRACE("idnev read finished");
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} else {
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LV_LOG_WARN("indev function registered");
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}
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return cont;
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}
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/**********************
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* STATIC FUNCTIONS
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**********************/
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