Raspberry1.cpp

#include "lvgl/lvgl.h"
#include "lv_drivers/display/fbdev.h"
#include "lv_drivers/indev/evdev.h"
#include "lv_demos/lv_demo.h"
#include <unistd.h>
#include <pthread.h>
#include <time.h>
#include <sys/time.h>

// display buffer size - not sure if this size is really needed
#define DISP_BUF_SIZE 384000		// 800x480

int main(int argc, char *argv[])
{
	/*LittlevGL init*/
	lv_init();

	/*Linux frame buffer device init*/
	fbdev_init();

	// Touch pointer device init
	evdev_init();
	
	/*A small buffer for LittlevGL to draw the screen's content*/
	static lv_color_t buf[DISP_BUF_SIZE];

	/*Initialize a descriptor for the buffer*/
	static lv_disp_draw_buf_t disp_buf;
	lv_disp_draw_buf_init(&disp_buf, buf, NULL, DISP_BUF_SIZE);

	/*Initialize and register a display driver*/
	static lv_disp_drv_t disp_drv;
	lv_disp_drv_init(&disp_drv);
	disp_drv.draw_buf   = &disp_buf;
	disp_drv.flush_cb   = fbdev_flush;
	disp_drv.hor_res    = 800;
	disp_drv.ver_res    = 480;
	lv_disp_drv_register(&disp_drv);
	
	// Initialize and register a pointer device driver
	lv_indev_drv_t indev_drv;
	lv_indev_drv_init(&indev_drv);
	indev_drv.type = LV_INDEV_TYPE_POINTER;
	indev_drv.read_cb = evdev_read;       // defined in lv_drivers/indev/evdev.h
	lv_indev_drv_register(&indev_drv);
	

	/*Create a Demo*/
	lv_demo_widgets();

	/*Handle LitlevGL tasks (tickless mode)*/
	while (1) {
		lv_task_handler();
		usleep(5000);
	}

	return 0;
}

/*Set in lv_conf.h as `LV_TICK_CUSTOM_SYS_TIME_EXPR`*/
uint32_t custom_tick_get(void)
{
	static uint64_t start_ms = 0;
	if (start_ms == 0) {
		struct timeval tv_start;
		gettimeofday(&tv_start, NULL);
		start_ms = (tv_start.tv_sec * 1000000 + tv_start.tv_usec) / 1000;
	}

	struct timeval tv_now;
	gettimeofday(&tv_now, NULL);
	uint64_t now_ms;
	now_ms = (tv_now.tv_sec * 1000000 + tv_now.tv_usec) / 1000;

	uint32_t time_ms = now_ms - start_ms;
	return time_ms;
}