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/**
* @file lv_nuttx_touchscreen.c
*
*/
/*********************
* INCLUDES
*********************/
#include "lv_nuttx_touchscreen.h"
#if LV_USE_NUTTX
#if LV_USE_NUTTX_TOUCHSCREEN
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <debug.h>
#include <errno.h>
#include <fcntl.h>
#include <nuttx/input/touchscreen.h>
#include "../../lvgl_private.h"
/*********************
* DEFINES
*********************/
/**********************
* TYPEDEFS
**********************/
typedef struct {
/* fd should be defined at the beginning */
int fd;
lv_indev_state_t last_state;
lv_indev_t * indev_drv;
} lv_nuttx_touchscreen_t;
/**********************
* STATIC PROTOTYPES
**********************/
static void touchscreen_read(lv_indev_t * drv, lv_indev_data_t * data);
static void touchscreen_delete_cb(lv_event_t * e);
static lv_indev_t * touchscreen_init(int fd);
/**********************
* STATIC VARIABLES
**********************/
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
lv_indev_t * lv_nuttx_touchscreen_create(const char * dev_path)
{
lv_indev_t * indev;
int fd;
LV_ASSERT_NULL(dev_path);
LV_LOG_USER("touchscreen %s opening", dev_path);
fd = open(dev_path, O_RDONLY | O_NONBLOCK);
if(fd < 0) {
perror("Error: cannot open touchscreen device");
return NULL;
}
LV_LOG_USER("touchscreen %s open success", dev_path);
indev = touchscreen_init(fd);
if(indev == NULL) {
close(fd);
}
return indev;
}
/**********************
* STATIC FUNCTIONS
**********************/
static void touchscreen_read(lv_indev_t * drv, lv_indev_data_t * data)
{
lv_nuttx_touchscreen_t * touchscreen = drv->driver_data;
struct touch_sample_s sample;
/* Read one sample */
int nbytes = read(touchscreen->fd, &sample,
sizeof(struct touch_sample_s));
/* Handle unexpected return values */
if(nbytes == sizeof(struct touch_sample_s)) {
uint8_t touch_flags = sample.point[0].flags;
if(touch_flags & TOUCH_DOWN || touch_flags & TOUCH_MOVE) {
const lv_display_t * disp_drv = drv->disp;
int32_t ver_max = disp_drv->ver_res - 1;
int32_t hor_max = disp_drv->hor_res - 1;
data->point.x = LV_CLAMP(0, sample.point[0].x, hor_max);
data->point.y = LV_CLAMP(0, sample.point[0].y, ver_max);
touchscreen->last_state = LV_INDEV_STATE_PRESSED;
}
else if(touch_flags & TOUCH_UP) {
touchscreen->last_state = LV_INDEV_STATE_RELEASED;
}
/* Read until the last point */
data->continue_reading = true;
}
data->state = touchscreen->last_state;
}
static void touchscreen_delete_cb(lv_event_t * e)
{
lv_indev_t * indev = (lv_indev_t *) lv_event_get_user_data(e);
lv_nuttx_touchscreen_t * touchscreen = lv_indev_get_driver_data(indev);
if(touchscreen) {
lv_indev_set_driver_data(indev, NULL);
lv_indev_set_read_cb(indev, NULL);
if(touchscreen->fd >= 0) {
close(touchscreen->fd);
touchscreen->fd = -1;
}
lv_free(touchscreen);
LV_LOG_USER("done");
}
}
static lv_indev_t * touchscreen_init(int fd)
{
lv_nuttx_touchscreen_t * touchscreen;
lv_indev_t * indev = NULL;
touchscreen = lv_malloc_zeroed(sizeof(lv_nuttx_touchscreen_t));
if(touchscreen == NULL) {
LV_LOG_ERROR("touchscreen_s malloc failed");
return NULL;
}
touchscreen->fd = fd;
touchscreen->last_state = LV_INDEV_STATE_RELEASED;
touchscreen->indev_drv = indev = lv_indev_create();
lv_indev_set_type(indev, LV_INDEV_TYPE_POINTER);
lv_indev_set_read_cb(indev, touchscreen_read);
lv_indev_set_driver_data(indev, touchscreen);
lv_indev_add_event_cb(indev, touchscreen_delete_cb, LV_EVENT_DELETE, indev);
return indev;
}
#endif /*LV_USE_NUTTX_TOUCHSCREEN*/
#endif /* LV_USE_NUTTX*/
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