littlevgl(Lvgl)最新版V7.4移植

LittleVGL最新已经更新到V7,网上大多数移植教程的版本比较老,很多特性没有,界面也不够酷炫。

原子最近更新的 LittleVGL 教程则是基于V6版本的,基本上搬过来全是报错,无法参考。新旧版本一致还是有很大区别的,这里介绍下最新版本的移植要点,针对嵌入式linux的framebuffer(dev/fb0)移植。

当然最最新的版本是V7.4.0,源码可以在github下载https://github.com/lvgl/lvgl。

关于lvgl的官网及介绍,在https://lvgl.io,Online demo:https://lvgl.io/demos,Docs:https://docs.lvgl.io

littlevgl(Lvgl)最新版V7.4移植

 

移植比较简单,主要区别是几个接口跟老版本的不一样了。不过最终都是实现disp_flush显示驱动接口即可。

接口原型新版本的是这样的:

void disp_flush(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t * color_p)

移植说明:

新建个工程文件夹,我这取名叫test,

然后在test文件夹下新建个lvgl文件夹,把下载到的源码中的src文件夹整个拷贝出来放进去。

把lv_conf_template.h拷贝出来,到工程的文件夹下,重命名为lv_conf.h.

编辑下,根据实际情况改下相关的配置:

#define LV_HOR_RES_MAX          (480)
#define LV_VER_RES_MAX          (272)
#define LV_COLOR_DEPTH     16
#define LV_USE_GPU              0 

/* 1: Enable file system (might be required for images */
#define LV_USE_FILESYSTEM       1
。。。

littlevgl(Lvgl)最新版V7.4移植

在工程的文件夹下建个lv_drivers文件夹,用于实现的驱动文件。

/**
* @file fbdev.c
*
*/

/*********************
* INCLUDES
*********************/
#include "fbdev.h"
#if USE_FBDEV

#include <stdlib.h>
#include <unistd.h>
#include <stddef.h>
#include <stdio.h>
#include <fcntl.h>
#include <linux/fb.h>
#include <sys/mman.h>
#include <sys/ioctl.h>

/*********************
* DEFINES
*********************/
#ifndef FBDEV_PATH
#define FBDEV_PATH "/dev/fb0"
#endif

/**********************
* TYPEDEFS
**********************/

/**********************
* STATIC PROTOTYPES
**********************/

/**********************
* STATIC VARIABLES
**********************/
static struct fb_var_screeninfo vinfo;
static struct fb_fix_screeninfo finfo;
static char *fbp = 0;
static long int screensize = 0;
static int fbfd = 0;

/**********************
* MACROS
**********************/

/**********************
* GLOBAL FUNCTIONS
**********************/

void fbdev_init(void)
{
// Open the file for reading and writing
fbfd = open(FBDEV_PATH, O_RDWR);
if (fbfd == -1) {
perror("Error: cannot open framebuffer device");
return;
}
printf("The framebuffer device was opened successfully.\n");

// Get fixed screen information
if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo) == -1) {
perror("Error reading fixed information");
return;
}

// Get variable screen information
if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo) == -1) {
perror("Error reading variable information");
return;
}

printf("%dx%d, %dbpp\n", vinfo.xres, vinfo.yres, vinfo.bits_per_pixel);

// Figure out the size of the screen in bytes
screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;

// Map the device to memory
fbp = (char *)mmap(0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED, fbfd, 0);
if ((int)fbp == -1) {
perror("Error: failed to map framebuffer device to memory");
return;
}
printf("The framebuffer device was mapped to memory successfully.\n");

}

/**
* Flush a buffer to the marked area
* @param x1 left coordinate
* @param y1 top coordinate
* @param x2 right coordinate
* @param y2 bottom coordinate
* @param color_p an array of colors
*/
void fbdev_flush(int32_t x1, int32_t y1, int32_t x2, int32_t y2, const lv_color_t * color_p)
{
if(fbp == NULL) return;

/*Return if the area is out the screen*/
if(x2 < 0) return;
if(y2 < 0) return;
if(x1 > vinfo.xres - 1) return;
if(y1 > vinfo.yres - 1) return;

/*Truncate the area to the screen*/
int32_t act_x1 = x1 < 0 ? 0 : x1;
int32_t act_y1 = y1 < 0 ? 0 : y1;
int32_t act_x2 = x2 > vinfo.xres - 1 ? vinfo.xres - 1 : x2;
int32_t act_y2 = y2 > vinfo.yres - 1 ? vinfo.yres - 1 : y2;

long int location = 0;

/*32 or 24 bit per pixel*/
if(vinfo.bits_per_pixel == 32 || vinfo.bits_per_pixel == 24) {
uint32_t *fbp32 = (uint32_t*)fbp;
uint32_t x;
uint32_t y;
for(y = act_y1; y <= act_y2; y++) {
for(x = act_x1; x <= act_x2; x++) {
location = (x+vinfo.xoffset) + (y+vinfo.yoffset) * vinfo.xres;
fbp32[location] = color_p->full;
color_p++;
}

color_p += x2 - act_x2;
}
}
/*16 bit per pixel*/
else if(vinfo.bits_per_pixel == 16) {
uint16_t *fbp16 = (uint16_t*)fbp;
uint32_t x;
uint32_t y;
for(y = act_y1; y <= act_y2; y++) {
for(x = act_x1; x <= act_x2; x++) {
location = (x+vinfo.xoffset) + (y+vinfo.yoffset) * vinfo.xres;
fbp16[location] = color_p->full;
color_p++;
}

color_p += x2 - act_x2;
}
}
/*8 bit per pixel*/
else if(vinfo.bits_per_pixel == 8) {
uint8_t *fbp8 = (uint8_t*)fbp;
uint32_t x;
uint32_t y;
for(y = act_y1; y <= act_y2; y++) {
for(x = act_x1; x <= act_x2; x++) {
location = (x+vinfo.xoffset) + (y+vinfo.yoffset) * vinfo.xres;
fbp8[location] = color_p->full;
color_p++;
}

color_p += x2 - act_x2;
}
} else {
/*Not supported bit per pixel*/
}

//May be some direct update command is required
//ret = ioctl(state->fd, FBIO_UPDATE, (unsigned long)((uintptr_t)rect));

//lv_flush_ready();
/* IMPORTANT!!!
* Inform the graphics library that you are ready with the flushing*/
}

/* Flush the content of the internal buffer the specific area on the display
* You can use DMA or any hardware acceleration to do this operation in the background but
* 'lv_disp_flush_ready()' has to be called when finished. */
void disp_flush(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t * color_p)
{
/* IMPORTANT!!!
* Inform the graphics library that you are ready with the flushing*/
fbdev_flush(area->x1,area->y1,area->x2,area->y2,color_p);
lv_disp_flush_ready(disp_drv);
}

/**
* Fill out the marked area with a color
* @param x1 left coordinate
* @param y1 top coordinate
* @param x2 right coordinate
* @param y2 bottom coordinate
* @param color fill color
*/
void fbdev_fill(int32_t x1, int32_t y1, int32_t x2, int32_t y2, lv_color_t color)
{
if(fbp == NULL) return;

/*Return if the area is out the screen*/
if(x2 < 0) return;
if(y2 < 0) return;
if(x1 > vinfo.xres - 1) return;
if(y1 > vinfo.yres - 1) return;

/*Truncate the area to the screen*/
int32_t act_x1 = x1 < 0 ? 0 : x1;
int32_t act_y1 = y1 < 0 ? 0 : y1;
int32_t act_x2 = x2 > vinfo.xres - 1 ? vinfo.xres - 1 : x2;
int32_t act_y2 = y2 > vinfo.yres - 1 ? vinfo.yres - 1 : y2;

uint32_t x;
uint32_t y;

long int location = 0;

/*32 or 24 bit per pixel*/
if(vinfo.bits_per_pixel == 32 || vinfo.bits_per_pixel == 24) {
uint32_t *fbp32 = (uint32_t*)fbp;
for(x = act_x1; x <= act_x2; x++) {
for(y = act_y1; y <= act_y2; y++) {
location = (x+vinfo.xoffset) + (y+vinfo.yoffset) * vinfo.xres;
fbp32[location] = color.full;
}
}
}
else if(vinfo.bits_per_pixel == 16) {
uint16_t *fbp16 = (uint16_t*)fbp;
for(x = act_x1; x <= act_x2; x++) {
for(y = act_y1; y <= act_y2; y++) {
location = (x+vinfo.xoffset) + (y+vinfo.yoffset) * vinfo.xres;
fbp16[location] = color.full;
}
}
}
else if(vinfo.bits_per_pixel == 8) {
uint8_t *fbp8 = (uint8_t*)fbp;
for(x = act_x1; x <= act_x2; x++) {
for(y = act_y1; y <= act_y2; y++) {
location = (x+vinfo.xoffset) + (y+vinfo.yoffset) * vinfo.xres;
fbp8[location] = color.full;
}
}
} else {
/*Not supported bit per pixel*/
}

//May be some direct update command is required
//ret = ioctl(state->fd, FBIO_UPDATE, (unsigned long)((uintptr_t)rect));

}

/**
* Put a color map to the marked area
* @param x1 left coordinate
* @param y1 top coordinate
* @param x2 right coordinate
* @param y2 bottom coordinate
* @param color_p an array of colors
*/
void fbdev_map(int32_t x1, int32_t y1, int32_t x2, int32_t y2, const lv_color_t * color_p)
{

if(fbp == NULL) return;

/*Return if the area is out the screen*/
if(x2 < 0) return;
if(y2 < 0) return;
if(x1 > vinfo.xres - 1) return;
if(y1 > vinfo.yres - 1) return;

/*Truncate the area to the screen*/
int32_t act_x1 = x1 < 0 ? 0 : x1;
int32_t act_y1 = y1 < 0 ? 0 : y1;
int32_t act_x2 = x2 > vinfo.xres - 1 ? vinfo.xres - 1 : x2;
int32_t act_y2 = y2 > vinfo.yres - 1 ? vinfo.yres - 1 : y2;

long int location = 0;

/*32 or 24 bit per pixel*/
if(vinfo.bits_per_pixel == 32 || vinfo.bits_per_pixel == 24) {
uint32_t *fbp32 = (uint32_t*)fbp;
uint32_t x;
uint32_t y;
for(y = act_y1; y <= act_y2; y++) {
for(x = act_x1; x <= act_x2; x++) {
location = (x+vinfo.xoffset) + (y+vinfo.yoffset) * vinfo.xres;
fbp32[location] = color_p->full;
color_p++;
}

color_p += x2 - act_x2;
}
}
/*16 bit per pixel*/
else if(vinfo.bits_per_pixel == 16) {
uint16_t *fbp16 = (uint16_t*)fbp;
uint32_t x;
uint32_t y;
for(y = act_y1; y <= act_y2; y++) {
for(x = act_x1; x <= act_x2; x++) {
location = (x+vinfo.xoffset) + (y+vinfo.yoffset) * vinfo.xres;
fbp16[location] = color_p->full;
color_p++;
}

color_p += x2 - act_x2;
}
}
/*8 bit per pixel*/
else if(vinfo.bits_per_pixel == 8) {
uint8_t *fbp8 = (uint8_t*)fbp;
uint32_t x;
uint32_t y;
for(y = act_y1; y <= act_y2; y++) {
for(x = act_x1; x <= act_x2; x++) {
location = (x+vinfo.xoffset) + (y+vinfo.yoffset) * vinfo.xres;
fbp8[location] = color_p->full;
color_p++;
}

color_p += x2 - act_x2;
}
} else {
/*Not supported bit per pixel*/
}

//May be some direct update command is required
//ret = ioctl(state->fd, FBIO_UPDATE, (unsigned long)((uintptr_t)rect));
}

/**********************
* STATIC FUNCTIONS
**********************/

#endif

附上一个小测试demo:

#include "lvgl.h"
#include "lv_drivers/display/fbdev.h"
#include <unistd.h>
//#include "lv_examples/lv_apps/demo/demo.h"

static lv_disp_buf_t disp_buf_2;
static lv_color_t buf2_1[LV_HOR_RES_MAX * 10]; /*A buffer for 10 rows*/
static lv_color_t buf2_2[LV_HOR_RES_MAX * 10]; /*An other buffer for 10 rows*/
//extern void demo_create(void);
int main(void)
{
/*LittlevGL init*/
lv_init();

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

/*Add a display the LittlevGL sing the frame buffer driver*/
lv_disp_drv_t disp_drv;
lv_disp_drv_init(&disp_drv);

disp_drv.flush_cb = disp_flush;
/*Set a display buffer*/
lv_disp_buf_init(&disp_buf_2, buf2_1, buf2_2, LV_HOR_RES_MAX * 10); /*Initialize the display buffer*/
disp_drv.buffer = &disp_buf_2;
//disp_drv.disp_flush = fbdev_flush; /*It flushes the internal graphical buffer to the frame buffer*/
lv_disp_drv_register(&disp_drv);

/*Create a "Hello world!" label*/
lv_obj_t * label = lv_label_create(lv_scr_act(), NULL);
lv_label_set_text(label, "hello worldaaa!v7.4");
lv_obj_align(label, NULL, LV_ALIGN_CENTER, 0, 0);

/*Handle LitlevGL tasks (tickless mode)*/

//demo_create();
while(1) {
lv_tick_inc(5);
lv_task_handler();
usleep(5000);
}

return 0;
}

如何运行?直接make即可生成可执行文件。

附makefile文件:

########################################
#makefile
########################################
#****************************************************************************
# Cross complie path
#****************************************************************************
CHAIN_ROOT= /home/yang/crosstool/ctools/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux/bin
CROSS_COMPILE=$(CHAIN_ROOT)/arm-linux-gnueabihf-

#CROSS_COMPILE =

CC := $(CROSS_COMPILE)gcc
CXX := $(CROSS_COMPILE)g++
AS := $(CROSS_COMPILE)as
AR := $(CROSS_COMPILE)ar
LD := $(CROSS_COMPILE)ld
RANLIB := $(CROSS_COMPILE)ranlib
OBJDUMP:= $(CROSS_COMPILE)objdump
OBJCOPY:= $(CROSS_COMPILE)objcopy
STRIP := $(CROSS_COMPILE)strip
#编译主程序
BINARY := littlevgl
OBJ_DIR := ./

INCS := -I ./ -I./lvgl/src/
CFLAGS= -Wall -g -std=c99 -fno-common -fsanitize=address -fno-stack-protector -fno-omit-frame-pointer -fno-var-tracking

#****************************************************************************
# Source files
#****************************************************************************
SRC_C=$(shell find . -name "*.c")

OBJ_C=$(patsubst %.c, %.o, $(SRC_C))

SRCS := $(SRC_C) $(SRC_C)

OBJS := $(OBJ_C)
LDSCRIPT= -lasan
LDFLAGS= -Llibs
#LDSCRIPT= -lNC_FileSys
#LDFLAGS= -Llib

#SRC = $(wildcard *.c)
#DIR = $(notdir $(SRC))
#OBJS = $(patsubst %.c,$(OBJ_DIR)%.o,$(DIR))
#OBJS= main.o myutils.o inirw.o cmdpboc.o cputest.o bustcp.o ansrec.o m1cmd.o m1api.o m1test.o upcash.o myother.o getsys.o
#CFLAGS=-std=c99
#@echo Building lib...
#$(call make_subdir)
.PHONY: clean
all: prebuild $(BINARY)

prebuild:
@echo Building app...

$(BINARY) : $(OBJS)
@echo Generating ...
$(CC) -o $(BINARY) $(OBJS) $(LDFLAGS) $(LDSCRIPT)
@echo OK!

$(OBJ_DIR)%.o : %.c
$(CC) -c $(CFLAGS) $(INCS) $< -o $@

clean:
rm -f $(OBJ_DIR)*.o
find . -name "*.[od]" |xargs rm
@

 

原创:https://www.panoramacn.com
源码网提供WordPress源码,帝国CMS源码discuz源码,微信小程序,小说源码,杰奇源码,thinkphp源码,ecshop模板源码,微擎模板源码,dede源码,织梦源码等。

专业搭建小说网站,小说程序,杰奇系列,微信小说系列,app系列小说

littlevgl(Lvgl)最新版V7.4移植

免责声明,若由于商用引起版权纠纷,一切责任均由使用者承担。

您必须遵守我们的协议,如果您下载了该资源行为将被视为对《免责声明》全部内容的认可-> 联系客服 投诉资源
www.panoramacn.com资源全部来自互联网收集,仅供用于学习和交流,请勿用于商业用途。如有侵权、不妥之处,请联系站长并出示版权证明以便删除。 敬请谅解! 侵权删帖/违法举报/投稿等事物联系邮箱:2640602276@qq.com
未经允许不得转载:书荒源码源码网每日更新网站源码模板! » littlevgl(Lvgl)最新版V7.4移植
关注我们小说电影免费看
关注我们,获取更多的全网素材资源,有趣有料!
120000+人已关注
分享到:
赞(0) 打赏

评论抢沙发

  • 昵称 (必填)
  • 邮箱 (必填)
  • 网址

您的打赏就是我分享的动力!

支付宝扫一扫打赏

微信扫一扫打赏