2022.5.11-5.18粤嵌课程记录

这篇具有很好参考价值的文章主要介绍了2022.5.11-5.18粤嵌课程记录。希望对大家有所帮助。如果存在错误或未考虑完全的地方,请大家不吝赐教,您也可以点击"举报违法"按钮提交疑问。

5.11-vim命令教学

arm-linux-gcc main.c -o main

输出main文件是一个arm的编译器文件,相当于ros的一个节点,可以直接在arm操作系统运行

2022.5.11-5.18粤嵌课程记录,linux,linux,arm开发,运维

arm-linux-gnueabi-gcc test.c -o test

但是用arm-linux-gnueabi-gcc命令输出的文件和arm-linux-gcc不一样?

2022.5.11-5.18粤嵌课程记录,linux,linux,arm开发,运维

需要统一环境,所以还是用老师给的环境虚拟机吧

尝试了一下winterm的xomdem功能好像传不了,还是老老实实用securyCRT吧

5.12-文件IO操作

open and read
// linux文件IO编程(系统调用函数)
// open(打开文件) write(写入)
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "stdio.h"
#include <unistd.h>

// man open
// man read
// man write
// man close
int main()
{
    int fd;
    //打开文件
    fd = open("1.txt",O_RDWR);
    // 自动创建
    //fd = open("2.txt", O_RDWR|O_CREAT);
    if (fd < 0)
    {
        perror("open file fail");
        return -1;
    }
    char buf[20] = {0};
    int ret;
    ret = read(fd,buf,10);
    printf("buf:%s, ret:%d\n", buf, ret);
    close(fd);
    return 0;
}
write
// linux文件IO编程(系统调用函数)
// open(打开文件) write(写入)
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "stdio.h"
#include <unistd.h>

// man open
// man read
// man write
// man close
// lseek
int main()
{
    int fd;
    //打开文件
    fd = open("1.txt",O_RDWR);
    // 自动创建
    //fd = open("2.txt", O_RDWR|O_CREAT);
    if (fd < 0)
    {
        perror("open file fail");
        return -1;
    }
    char buf[20] = {0};
    int ret;
    ret = read(fd,buf,10);
    printf("buf:%s, ret:%d\n", buf, ret);
    /*写入文件*/
    char buf1[] = "abcdef";
    int ret_wirte;
    ret_wirte = write(fd,buf1,7);
    printf("write_buf:%s, ret_write:%d\n",buf1,ret_wirte);
    close(fd);
    return 0;
}
lseek
// linux文件IO编程(系统调用函数)
// open(打开文件) write(写入)
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "stdio.h"
#include <unistd.h>

// man open
// man read
// man write
// man close
// lseek
int main()
{
    int fd;
    //打开文件
    fd = open("1.txt",O_RDWR);
    // 定位文件
    lseek(fd, 3, SEEK_SET);
    printf("len=%d\n", lseek(fd,0,SEEK_END));
    if (fd < 0)
    {
        perror("open file fail");
        return -1;
    }
    char buf[20] = {0};
    int ret;
    ret = read(fd,buf,10);
    printf("buf:%s, ret:%d\n", buf, ret);
    close(fd);
    return 0;
}
文件复制操作
/*实现文件复制,如果文件内容大于5个字节,则循环每次先复制5个字节,一直到复制完*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <string.h>
#include <assert.h>

int main(int argc, char *argv[])
{
        int fd1,fd2;
        int b;
        char buff[5] ;

        fd1 = open("img.png",O_RDWR);
        fd2 = open("copy.png", O_RDWR | O_CREAT,);

        //先把文件偏移量移到文件末尾,返回文件内容大小,然后再使文件偏移量移到文件头
       b = lseek(fd1, 0, SEEK_END);
       lseek(fd1, 0, SEEK_SET);
       while(b>0 && b>=5)
       {
                read(fd1, buff, sizeof(buff));
                write(fd2,buff,sizeof(buff));
               b -=5;
       }
       close(fd1);
       close(fd2);

        return 0;
 }
  • 老师代码
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#define SIZE 1024

int main(int argc,char *argv[])
{
	//打开源文件
	int fd_src,fd_dst;
	fd_src = open(argv[1],O_RDWR);
	if(fd_src < 0)
	{
		printf("open %s fail\n",argv[1]);
		return -1;
	}
	//打目标文件
	fd_dst = open(argv[2],O_RDWR|O_CREAT);
	if(fd_src < 0)
	{
		printf("open %s fail\n",argv[2]);
		return -1;
	}	
	
	//清空数据存储区
	char buf[SIZE];
	memset(buf,0,sizeof(buf));
	int ret_rd,ret_wr,i=0;
	
	while(1)
	{	
		//读源文件
		ret_rd = read(fd_src,buf,SIZE);
		
		//写目标文件
		ret_wr = write(fd_dst,buf,ret_rd);
		
		printf("rd:%d wr:%d count:%d\n",ret_rd,ret_wr,++i);
		
		//读写的结束条件
		if(ret_rd < SIZE)
			break;
	}
	
	//关闭文件
	close(fd_src);
	close(fd_dst);
	return 0;
}  

运行指令

gcc copy_images.c -o copy
./copy img.png  copy.png

5.13-LCD显示

2022.5.11-5.18粤嵌课程记录,linux,linux,arm开发,运维

2022.5.11-5.18粤嵌课程记录,linux,linux,arm开发,运维

void *mmap(void *addr, size_t len, int prot, int flags, int fd, off_t offset);

在这个函数原型中:

参数addr:指定映射的起始地址,通常设为NULL,由内核来分配

参数length:代表将文件中映射到内存的部分的长度。

参数prot:映射区域的保护方式。可以为以下几种方式的组合:

PROT_EXEC 映射区域可被执行
PROT_READ 映射区域可被读取
PROT_WRITE 映射区域可被写入
PROT_NONE 映射区域不能存取

参数flags:映射区的特性标志位,常用的两个选项是:

MAP_SHARD:写入映射区的数据会复制回文件,且运行其他映射文件的进程共享

MAP_PRIVATE:对映射区的写入操作会产生一个映射区的复制,对此区域的修改不会写会原文件

参数fd:要映射到内存中的文件描述符,有open函数打开文件时返回的值。

参数offset:文件映射的偏移量,通常设置为0,代表从文件最前方开始对应,offset必须是分页大小的整数倍。

函数返回值:实际分配的内存的起始地址。

2022.5.11-5.18粤嵌课程记录,linux,linux,arm开发,运维

2022.5.11-5.18粤嵌课程记录,linux,linux,arm开发,运维

画球
#include <stdio.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#define LCD_WIDTH 	800
#define LCD_HEIGHT 	480
#define FB_SIZE 	800*480*4
#define WHITE_COLOR	0x00FFFFFF

void lcd_draw_point(unsigned int x, unsigned int y, unsigned int color, unsigned int *lcd_ptr)
{
    if( x<LCD_WIDTH && y<LCD_HEIGHT )
    {
        *(lcd_ptr+LCD_WIDTH*y+x) = color;
    }
}

void lcd_draw_circle(unsigned r_x, unsigned int r_y, unsigned int radius, unsigned int *lcd_ptr)
{
    unsigned int x_begin, y_begin;
    if(r_x-radius<0)
    {
        r_x = radius;
    }
    if(r_y-radius<0)
    {
        r_y = radius;
    }
    for(y_begin=r_y-radius; y_begin<r_y+radius; y_begin++)
    {
        for(x_begin=r_x-radius; x_begin<r_x+radius; x_begin++)
        {
            if((r_x-x_begin)*(r_x-x_begin) + (r_y-y_begin)*(r_y-y_begin) < radius*radius)
            {
                lcd_draw_point(x_begin, y_begin, 0x00ff0000, lcd_ptr);
            }
        }
    }
}

void lcd_draw_single_color(unsigned int color, unsigned int *lcd_ptr)
{
    int x, y;
    for(y=0; y<LCD_HEIGHT; y++)
    {
        for(x=0; x<LCD_WIDTH; x++)
        {
            *(lcd_ptr+LCD_WIDTH*y+x) = color;
        }
    }
}

int open_lcd_device(unsigned int **lcd_ptr)
{
    int lcd_fd;

    lcd_fd = open("/dev/fb0", O_RDWR);
    if(lcd_fd == -1)
    {
        perror("open lcd device failed\n");
        return -1;
    }

    *lcd_ptr = mmap( NULL, FB_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, lcd_fd, 0);
    if(lcd_ptr == MAP_FAILED)
    {
        perror("map lcd_fb error\n");
        return -1;
    }


    return lcd_fd;
}

int close_lcd_device(int lcd_fd, unsigned int *lcd_ptr)
{
    munmap(lcd_ptr, FB_SIZE);

    return close(lcd_fd);
}




int main(int argc,char *argv[])
{
	int lcd_fd, radius = 100;
	unsigned int *lcd_ptr;

	lcd_fd = open_lcd_device(&lcd_ptr);
	if(lcd_fd == -1)
	{
		return -1;
	}

	lcd_draw_single_color( WHITE_COLOR, lcd_ptr );
	
	lcd_draw_circle(LCD_WIDTH/2, LCD_HEIGHT/2, radius, lcd_ptr);	
	
	close_lcd_device(lcd_fd, lcd_ptr);

	return 0;
}

2022.5.11-5.18粤嵌课程记录,linux,linux,arm开发,运维

画球算法解析

2022.5.11-5.18粤嵌课程记录,linux,linux,arm开发,运维

其实就扫描屏幕的坐标点,满足if((r_x-x_begin)*(r_x-x_begin) + (r_y-y_begin)*(r_y-y_begin) < radius*radius)这个条件的就给这个地址赋值像素信息

画多个球(就是换坐标,换颜色调用函数)
//
// Created by zh006 on 2022/5/13.
//
#include <stdio.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#define LCD_WIDTH 	800
#define LCD_HEIGHT 	480
#define FB_SIZE 	800*480*4
#define WHITE_COLOR	0x00FFFFFF

void lcd_draw_point(unsigned int x, unsigned int y, unsigned int color, unsigned int *lcd_ptr)
{
    if( x<LCD_WIDTH && y<LCD_HEIGHT )
    {
        *(lcd_ptr+LCD_WIDTH*y+x) = color;
    }
}

void lcd_draw_circle(unsigned r_x, unsigned int r_y, unsigned int radius, unsigned int *lcd_ptr,int color)
{
    unsigned int x_begin, y_begin;
    if(r_x-radius<0)
    {
        r_x = radius;
    }
    if(r_y-radius<0)
    {
        r_y = radius;
    }
    for(y_begin=r_y-radius; y_begin<r_y+radius; y_begin++)
    {
        for(x_begin=r_x-radius; x_begin<r_x+radius; x_begin++)
        {
            if((r_x-x_begin)*(r_x-x_begin) + (r_y-y_begin)*(r_y-y_begin) < radius*radius)
            {
                lcd_draw_point(x_begin, y_begin, color, lcd_ptr);
            }
        }
    }
}

void lcd_draw_single_color(unsigned int color, unsigned int *lcd_ptr)
{
    int x, y;
    for(y=0; y<LCD_HEIGHT; y++)
    {
        for(x=0; x<LCD_WIDTH; x++)
        {
            *(lcd_ptr+LCD_WIDTH*y+x) = color;
        }
    }
}

int open_lcd_device(unsigned int **lcd_ptr)
{
    int lcd_fd;

    lcd_fd = open("/dev/fb0", O_RDWR);
    if(lcd_fd == -1)
    {
        perror("open lcd device failed\n");
        return -1;
    }

    *lcd_ptr = mmap( NULL, FB_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, lcd_fd, 0);
    if(lcd_ptr == MAP_FAILED)
    {
        perror("map lcd_fb error\n");
        return -1;
    }


    return lcd_fd;
}

int close_lcd_device(int lcd_fd, unsigned int *lcd_ptr)
{
    munmap(lcd_ptr, FB_SIZE);

    return close(lcd_fd);
}




int main(int argc,char *argv[])
{
    int lcd_fd, radius = 50;
    int green = 0x0000ff00;
    int red = 0x00ff0000;
    int blue = 0x00000ff;
    int yellow = 0x00ffff3;
    int purple = 0xcc3399;
    unsigned int *lcd_ptr;

    lcd_fd = open_lcd_device(&lcd_ptr);
    if(lcd_fd == -1)
    {
        return -1;
    }

    lcd_draw_single_color( WHITE_COLOR, lcd_ptr );

    lcd_draw_circle(LCD_WIDTH/2-100, LCD_HEIGHT/2, radius, lcd_ptr,green);
    lcd_draw_circle(LCD_WIDTH/2, LCD_HEIGHT/2, radius, lcd_ptr,red);
    lcd_draw_circle(LCD_WIDTH/2+100, LCD_HEIGHT/2, radius, lcd_ptr,blue);
    lcd_draw_circle(LCD_WIDTH/2+200, LCD_HEIGHT/2, radius, lcd_ptr,purple);
    lcd_draw_circle(LCD_WIDTH/2-200, LCD_HEIGHT/2, radius, lcd_ptr,yellow);

    close_lcd_device(lcd_fd, lcd_ptr);

    return 0;
}

2022.5.11-5.18粤嵌课程记录,linux,linux,arm开发,运维

画动态的球(撞到墙壁边缘弹射,两球相撞弹射)
//
// Created by zh006 on 2022/5/13.
//
#include <stdio.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <math.h>

#define LCD_WIDTH 	800
#define LCD_HEIGHT 	480
#define FB_SIZE 	800*480*4
#define WHITE_COLOR	0xFFFFFF


void lcd_draw_point(unsigned int x, unsigned int y, unsigned int color, unsigned int *lcd_ptr)
{
    if( x<LCD_WIDTH && y<LCD_HEIGHT )
    {
        *(lcd_ptr+LCD_WIDTH*y+x) = color;
    }
}

void lcd_draw_run_circle(unsigned r_x1, unsigned int r_y1,
                         unsigned r_x2, unsigned r_y2, unsigned int radius,
                         unsigned int mv_speed, unsigned int *lcd_ptr,
                         int color1, int color2)
{
    int x_mv1 = mv_speed, y_mv1 = mv_speed;
    int x_mv2 = mv_speed, y_mv2 = mv_speed;
    // 第一个球配置
    unsigned int x_begin1, y_begin1;
    if(r_x1-radius<0)
    {
        r_x1 = radius;
    }
    if(r_y1-radius<0)
    {
        r_y1 = radius;
    }

    // 第二个球配置
    unsigned int x_begin2, y_begin2;
    if(r_x2-radius<0)
    {
        r_x2 = radius;
    }
    if(r_y2-radius<0)
    {
        r_y2 = radius;
    }

    while(1)
    {
        // 画第一个球
        for(y_begin1=r_y1-radius; y_begin1<r_y1+radius; y_begin1++)
        {
            for(x_begin1=r_x1-radius; x_begin1<r_x1+radius; x_begin1++)
            {
                if((r_x1-x_begin1)*(r_x1-x_begin1) + (r_y1-y_begin1)*(r_y1-y_begin1) < radius*radius)
                {
                    lcd_draw_point(x_begin1, y_begin1, color1, lcd_ptr);
                }
            }
        }

        // 画第二个球
        for(y_begin2=r_y2-radius; y_begin2<r_y2+radius; y_begin2++)
        {
            for(x_begin2=r_x2-radius; x_begin2<r_x2+radius; x_begin2++)
            {
                if((r_x2-x_begin2)*(r_x2-x_begin2) + (r_y2-y_begin2)*(r_y2-y_begin2) < radius*radius)
                {
                    lcd_draw_point(x_begin2, y_begin2, color2, lcd_ptr);
                }
            }
        }

        // 第一个球边缘碰撞检测
        if(r_x1<radius || r_x1>= LCD_WIDTH - radius)
        {
            x_mv1 = -x_mv1;
        }
        if(r_y1<radius || r_y1>= LCD_HEIGHT - radius)
        {
            y_mv1 = -y_mv1;
        }
        // 第二个球边缘碰撞检测
        if(r_x2<radius || r_x2>= LCD_WIDTH - radius)
        {
            x_mv2 = -x_mv2;
        }
        if(r_y2<radius || r_y2>= LCD_HEIGHT - radius)
        {
            y_mv2 = -y_mv2;
        }
        // 两球相撞检测
        int dx = r_x1 - r_x2;
        int dy = r_y1 - r_y2;
        float distance = sqrt(dx * dx + dy * dy);
        if (distance <= 2*radius)
        {
            x_mv1 = -x_mv1;
            y_mv1 = -y_mv1;
            x_mv2 = -x_mv2;
            y_mv2 = -y_mv2;

        }

        // 第一个球坐标赋新值
        r_y1 += y_mv1;
        r_x1 += x_mv1;
        // 第二个坐标赋新值
        r_y2 += y_mv2;
        r_x2 += x_mv2;

        // 第一个球的之前的地方重新填补白色
        for(y_begin1=0; y_begin1<LCD_HEIGHT; y_begin1++)
        {
            for(x_begin1=0; x_begin1<LCD_WIDTH; x_begin1++)
            {
                if((r_x1-x_begin1)*(r_x1-x_begin1) + (r_y1-y_begin1)*(r_y1-y_begin1) >= radius*radius)
                {
                    lcd_draw_point(x_begin1, y_begin1, WHITE_COLOR, lcd_ptr);
                }
            }
        }


        for(y_begin2=r_y2-radius; y_begin2<r_y2+radius; y_begin2++)
        {
            for(x_begin2=r_x2-radius; x_begin2<r_x2+radius; x_begin2++)
            {
                if((r_x2-x_begin2)*(r_x2-x_begin2) + (r_y2-y_begin2)*(r_y2-y_begin2) < radius*radius)
                {
                    lcd_draw_point(x_begin2, y_begin2, color2, lcd_ptr);
                }
            }
        }

        // 第二个球的之前的地方重新填补白色
        for(y_begin2=0; y_begin2<LCD_HEIGHT; y_begin2++)
        {
            for(x_begin2=0; x_begin2<LCD_WIDTH; x_begin2++)
            {
                if((r_x2-x_begin2)*(r_x2-x_begin2) + (r_y2-y_begin2)*(r_y2-y_begin2) >= radius*radius)
                {
                    lcd_draw_point(x_begin2, y_begin2, WHITE_COLOR, lcd_ptr);
                }
            }
        }

    }
}


void lcd_draw_single_color(unsigned int color, unsigned int *lcd_ptr)
{
    int x, y;
    for(y=0; y<LCD_HEIGHT; y++)
    {
        for(x=0; x<LCD_WIDTH; x++)
        {
            *(lcd_ptr+LCD_WIDTH*y+x) = color;
        }
    }
}

int open_lcd_device(unsigned int **lcd_ptr)
{
    int lcd_fd;

    lcd_fd = open("/dev/fb0", O_RDWR);
    if(lcd_fd == -1)
    {
        perror("open lcd device failed\n");
        return -1;
    }

    *lcd_ptr = mmap( NULL, FB_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, lcd_fd, 0);
    if(lcd_ptr == MAP_FAILED)
    {
        perror("map lcd_fb error\n");
        return -1;
    }


    return lcd_fd;
}

int close_lcd_device(int lcd_fd, unsigned int *lcd_ptr)
{
    munmap(lcd_ptr, FB_SIZE);

    return close(lcd_fd);
}


int main(int argc,char *argv[])
{
    int lcd_fd, radius = 70;
    int green = 0x0000ff00;
    int red = 0x00ff0000;
    int blue = 0x00000ff;
    int yellow = 0x00ffff3;
    int purple = 0xcc3399;
    unsigned int *lcd_ptr;

    lcd_fd = open_lcd_device(&lcd_ptr);
    if(lcd_fd == -1)
    {
        return -1;
    }



    lcd_draw_single_color( WHITE_COLOR, lcd_ptr );

    lcd_draw_run_circle(LCD_WIDTH/2, LCD_HEIGHT/2, LCD_WIDTH/2+200, LCD_HEIGHT/2,
                        radius, 3, lcd_ptr,purple, yellow);
    close_lcd_device(lcd_fd, lcd_ptr);

    return 0;
}

老师代码

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>

int main()
{
	//打开lcd
	int fd;
	fd = open("/dev/fb0",O_RDWR);
	if(fd < 0)
	{
		perror("open lcd fail");
		return -1;
	}
	
	//lcd的映射
	int *addr;
	addr = mmap(NULL,800*480*4,PROT_READ|PROT_WRITE,MAP_SHARED,fd,0);
	if(addr == NULL)
	{
		perror("mmap fail");
		return -1;
	}
	
	int black = 0x00000000;
	int red = 0x00ff0000;
	int green = 0x0000ff00;
	
	int a=400,b=240,r=100;
	int a1=150,b1=350,r1=80;
	int m=10,n=20; //球1
	int m1=8,n1=5; //球2
	int tmp;
	
	int x;
	int y;
	while(1)
	{	
		for(y=0;y<480;y++)
		{
			for(x=0;x<800;x++)
			{
				*(addr+y*800+x) = black;
				if((x-a)*(x-a)+(y-b)*(y-b) <= r*r)
					*(addr+y*800+x) = red; //球1
				
				if((x-a1)*(x-a1)+(y-b1)*(y-b1) <= r1*r1)
					*(addr+y*800+x) = green; //球2			
			}
		}
		
		//球1动
		a+=m;b+=n;
		//球1反弹
		if(a<100||a>700)
			m = -m;
		if(b<100||b>380)
			n = -n;		
		
		//球2动
		a1+=m1;b1+=n1;
		//球2反弹
		if(a1<80||a1>720)
			m1 = -m1;
		if(b1<80||b1>400)
			n1 = -n1;	

		//两球相碰
		if((a-a1)*(a-a1)+(b-b1)*(b-b1)<=(r+r1)*(r+r1))
		{
			//反弹
			m = -m;n = -n;
			m1 = -m1;n1 = -n1;
			
			//换色
			tmp = red;
			red = green;
			green = tmp;
		}
	}	
	//lcd的映射释放
	munmap(addr,800*480*4);
	
	//关闭lcd
	close(fd);
	
	return 0;
}

一个问题就是我的代码需要小球运动后需要重新填充颜色,但是老师的代码没有体现这个

5.14-bmp图片显示

功能:循环显示三张图片,中间间隔1s

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>


int show_bmp(char * pathname, int *addr)
{
    if(addr == NULL)
    {
        perror("mmap fail");
        return -1;
    }
    //打开一张bmp图
    int fd_bmp;
    fd_bmp = open(pathname,O_RDWR);
    if(fd_bmp < 0)
    {
        perror("open bmp fail");
        return -1;
    }

    //去掉bmp图片的头54个字节
    lseek(fd_bmp,54,SEEK_SET);
    //读bmp图
    char buf[800*480*3] = {0};
    read(fd_bmp,buf,800*480*3);

    int x;
    int y;
    for(y=0;y<480;y++)
    {
        for(x=0;x<800;x++)
        {
            *(addr+(479-y)*800+x) = (buf[(y*800+x)*3+0]) | (buf[(y*800+x)*3+1]<<8) | (buf[(y*800+x)*3+2]<<16);
            //479     =  buf[0]|buf[1]<<8|buf[2]<16
            //478	=  buf[3]|buf[4]<<8|buf[5]<16
        }
    }
    // unsigned int sleep(unsigned int seconds);以秒为单位
    sleep(1);
}

int main()
{
    int fd;
    fd = open("/dev/fb0",O_RDWR);
    if(fd < 0)
    {
        perror("open lcd fail");
        return -1;
    }
    //lcd的映射
    int *addr = mmap(NULL, 800 * 480 * 4, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
    if (addr == NULL)
    {
        perror("mmap fail");
        return -1;
    }
    while(1)
    {
        show_bmp("lufei.bmp", addr);
        show_bmp("sabo.bmp", addr);
        show_bmp("aisi.bmp", addr);
    }
    //lcd的映射释放
    munmap(addr,800*480*4);
    //关闭lcd
    close(fd);

    return 0;
}

创建项目多文件处理的形式

arm-linux-gcc src/*.c -o draw_circle -I include
  • src/*.c 编译所有c文件
  • draw_circle 输出的可执行文件名
  • -I incldue 引用的头文件的路径

5.16

1.jpeg库移植
1.将jpegsrc.v9a.tar.gz 解压到共享目录,
               ①tar -zxvf jpegsrc.v9a.tar.gz -C ~       x    c    z    j   压缩GZ:cz      解压bz2格式:xj
               -C :指定包解压的位置
               Linux: gz    bz2    xz
               x:解压           c:压缩
               z:gz格式     j:bz2格式
2.在家目录创建一个jpeg目录
                ②cd
                ③mkdir jpeg
    
3.进入jpeg-9a目录
    ④cd jpeg-9a
    
4.配置jpeg-9a
    ⑤./configure --prefix=/home/gec/jpeg/  CC=arm-linux-gcc --host=arm-linux --enable-shared --enable-static
    
    host:指定编译的命令
    prefix : jpeg安装的位置
    
5.编译jpeg
    ⑥make -j
    
5.安装jpeg
    ⑦make install

①将/home/gec/jpeg/arm-jpeg/lib/libjpeg.so.9,下载到开发板/lib目录,然后修改库权限
②在windowns建一个文件,
③将/home/gec/jpeg/arm-jpeg/lib里面的所有拷贝到windowns放进该文件夹
④将/home/gec/jpeg/arm-jpeg/include里面的头文件拷贝到windowns放进该文件夹
    
6.编译代码


1. arm-linux-gcc *.c -o main -I./libjpeg -L./libjpeg -ljpeg 


 *.c :当前目录下的所有.c文件(只有一个.c文件有main函数)
 -I./libjpeg :指定第三方库的一个头文件路径
 -L./libjpeg :指定第三方动态库的路径
 -ljpeg :指定动态库的库名

  规定:libxxxx.so 库名
        -lxxxx就代表链接库文件
2.交叉编译添加库
arm-linux-gcc *.c -o main -I./libjpeg -L./libjpeg -ljpeg -L./ -lfont

使用举例:(有libtest.a静态库)

g++ -o compress  compress.cpp -I./include/ -L/lib/ -ltest

**1)-I(大写i):**指定头文件搜索路径;

-I./include/表示将./include/目录作为第一个寻找头文件的目录,寻找的顺序是:
./include/ --> /usr/include --> /usr/local/include

**2)-L(大写l):**指定库文件搜索路径;

表示:编译程序按照-L指定的路进去寻找库文件,一般的在-L的后面可以一次用-l指定多个库文件。
-L/lib/表示到/lib/目录下找库文件

**3)-l(小写l)😗*指定要连接的库名称;

表示:编译程序到系统默认路进搜索,如果找不到,到当前目录,如果当前目录找不到,则到LD_LIBRARY_PATH等环境变量置顶的路进去查找,如果还找不到,那么编译程序提示找不到库。
本例子使用的是test库,库文件名是libtest.a,库名是test。很容易看出,把库文件名的头lib和尾.test去掉就是库名了。

注意:1.库的添加顺序;2.相互依赖需要多次引入/配置编译属性;文章来源地址https://www.toymoban.com/news/detail-700207.html

5.18

把所有的输入设备 都归结到输入子系统中去。
输入设备: 鼠标  键盘  触摸屏 
 
他有一个专门的结构体来保存这些事件。
这个结构体在哪里呢? /dev/input/event0
 
struct input_event 用来描述一盒输入事件 定义<linux/input.h>
{
    _u16 type : 表示我这个输入事件的类型
                EV_KEY :按键事件
                EV_REL:  相对事件 : 鼠标事件
                EV_ABS : 绝对事件  :  触摸屏事件
                 
    _16 code : code的含义 根据我type的不同 而不同
            if  ( type == EV_KEY)
                code == 按键的键值 
                    KEY_A
                    KEY_B
                    ...
                #define BTN_TOUCH 0X14A ; //触摸屏按键
             
            if (type ==EV_REL)
                code = 相对坐标轴
                REL_X   相对坐标轴的X轴
                REL_Y   相对坐标轴的Y轴
                 
            if (type == EV_ABS)
                code =绝对坐标轴 (触摸屏)
                ABS_X  绝对坐标轴的X轴
                ABS_Y  绝对坐标轴的Y轴
     
    _s32  value: 根据我type的不同 而不同
     
            if(type == EV_KEY)
            {
                if(code ==BTN_TOUCH)
                {
                        value = 1 : 说明我这个按键是按下状态
                        Value = 0 :  说明我这个按键是松开状态
                }
            }
         
            if(type == EV_ABS )
            {
                if(code == ABS_X)
                     value = 绝对坐标轴的X轴的值
                if(code == ABS_Y)
                     value = 绝对坐标轴的Y轴的值
            }          
     
}
我们的应用 就是不停地去读取我这个 结构体地信息。
 
练习: 获取手指在屏幕上点击的坐标 
第一步: 打开我这个linux输入子系统  open(“/dev/input/event0 ”,。。。)
 
第二步: 去读取这个结构体里面的信息。 自定义一个结构体 struct input_event ev
            read(fd,&ev,sizeof(ev)); while(1);
         
第三步: 分析我上面讲解地这三项 ,获得触摸地绝对坐标轴值
 
第四步: 关闭输入子设备
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * Input event codes
 *
 *    *** IMPORTANT ***
 * This file is not only included from C-code but also from devicetree source
 * files. As such this file MUST only contain comments and defines.
 *
 * Copyright (c) 1999-2002 Vojtech Pavlik
 * Copyright (c) 2015 Hans de Goede <hdegoede@redhat.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */
#ifndef _INPUT_EVENT_CODES_H
#define _INPUT_EVENT_CODES_H

/*
 * Device properties and quirks
 */

#define INPUT_PROP_POINTER		0x00	/* needs a pointer */
#define INPUT_PROP_DIRECT		0x01	/* direct input devices */
#define INPUT_PROP_BUTTONPAD		0x02	/* has button(s) under pad */
#define INPUT_PROP_SEMI_MT		0x03	/* touch rectangle only */
#define INPUT_PROP_TOPBUTTONPAD		0x04	/* softbuttons at top of pad */
#define INPUT_PROP_POINTING_STICK	0x05	/* is a pointing stick */
#define INPUT_PROP_ACCELEROMETER	0x06	/* has accelerometer */

#define INPUT_PROP_MAX			0x1f
#define INPUT_PROP_CNT			(INPUT_PROP_MAX + 1)

/*
 * Event types
 */

#define EV_SYN			0x00
#define EV_KEY			0x01
#define EV_REL			0x02
#define EV_ABS			0x03
#define EV_MSC			0x04
#define EV_SW			0x05
#define EV_LED			0x11
#define EV_SND			0x12
#define EV_REP			0x14
#define EV_FF			0x15
#define EV_PWR			0x16
#define EV_FF_STATUS		0x17
#define EV_MAX			0x1f
#define EV_CNT			(EV_MAX+1)

/*
 * Synchronization events.
 */

#define SYN_REPORT		0
#define SYN_CONFIG		1
#define SYN_MT_REPORT		2
#define SYN_DROPPED		3
#define SYN_MAX			0xf
#define SYN_CNT			(SYN_MAX+1)

/*
 * Keys and buttons
 *
 * Most of the keys/buttons are modeled after USB HUT 1.12
 * (see http://www.usb.org/developers/hidpage).
 * Abbreviations in the comments:
 * AC - Application Control
 * AL - Application Launch Button
 * SC - System Control
 */

#define KEY_RESERVED		0
#define KEY_ESC			1
#define KEY_1			2
#define KEY_2			3
#define KEY_3			4
#define KEY_4			5
#define KEY_5			6
#define KEY_6			7
#define KEY_7			8
#define KEY_8			9
#define KEY_9			10
#define KEY_0			11
#define KEY_MINUS		12
#define KEY_EQUAL		13
#define KEY_BACKSPACE		14
#define KEY_TAB			15
#define KEY_Q			16
#define KEY_W			17
#define KEY_E			18
#define KEY_R			19
#define KEY_T			20
#define KEY_Y			21
#define KEY_U			22
#define KEY_I			23
#define KEY_O			24
#define KEY_P			25
#define KEY_LEFTBRACE		26
#define KEY_RIGHTBRACE		27
#define KEY_ENTER		28
#define KEY_LEFTCTRL		29
#define KEY_A			30
#define KEY_S			31
#define KEY_D			32
#define KEY_F			33
#define KEY_G			34
#define KEY_H			35
#define KEY_J			36
#define KEY_K			37
#define KEY_L			38
#define KEY_SEMICOLON		39
#define KEY_APOSTROPHE		40
#define KEY_GRAVE		41
#define KEY_LEFTSHIFT		42
#define KEY_BACKSLASH		43
#define KEY_Z			44
#define KEY_X			45
#define KEY_C			46
#define KEY_V			47
#define KEY_B			48
#define KEY_N			49
#define KEY_M			50
#define KEY_COMMA		51
#define KEY_DOT			52
#define KEY_SLASH		53
#define KEY_RIGHTSHIFT		54
#define KEY_KPASTERISK		55
#define KEY_LEFTALT		56
#define KEY_SPACE		57
#define KEY_CAPSLOCK		58
#define KEY_F1			59
#define KEY_F2			60
#define KEY_F3			61
#define KEY_F4			62
#define KEY_F5			63
#define KEY_F6			64
#define KEY_F7			65
#define KEY_F8			66
#define KEY_F9			67
#define KEY_F10			68
#define KEY_NUMLOCK		69
#define KEY_SCROLLLOCK		70
#define KEY_KP7			71
#define KEY_KP8			72
#define KEY_KP9			73
#define KEY_KPMINUS		74
#define KEY_KP4			75
#define KEY_KP5			76
#define KEY_KP6			77
#define KEY_KPPLUS		78
#define KEY_KP1			79
#define KEY_KP2			80
#define KEY_KP3			81
#define KEY_KP0			82
#define KEY_KPDOT		83

#define KEY_ZENKAKUHANKAKU	85
#define KEY_102ND		86
#define KEY_F11			87
#define KEY_F12			88
#define KEY_RO			89
#define KEY_KATAKANA		90
#define KEY_HIRAGANA		91
#define KEY_HENKAN		92
#define KEY_KATAKANAHIRAGANA	93
#define KEY_MUHENKAN		94
#define KEY_KPJPCOMMA		95
#define KEY_KPENTER		96
#define KEY_RIGHTCTRL		97
#define KEY_KPSLASH		98
#define KEY_SYSRQ		99
#define KEY_RIGHTALT		100
#define KEY_LINEFEED		101
#define KEY_HOME		102
#define KEY_UP			103
#define KEY_PAGEUP		104
#define KEY_LEFT		105
#define KEY_RIGHT		106
#define KEY_END			107
#define KEY_DOWN		108
#define KEY_PAGEDOWN		109
#define KEY_INSERT		110
#define KEY_DELETE		111
#define KEY_MACRO		112
#define KEY_MUTE		113
#define KEY_VOLUMEDOWN		114
#define KEY_VOLUMEUP		115
#define KEY_POWER		116	/* SC System Power Down */
#define KEY_KPEQUAL		117
#define KEY_KPPLUSMINUS		118
#define KEY_PAUSE		119
#define KEY_SCALE		120	/* AL Compiz Scale (Expose) */

#define KEY_KPCOMMA		121
#define KEY_HANGEUL		122
#define KEY_HANGUEL		KEY_HANGEUL
#define KEY_HANJA		123
#define KEY_YEN			124
#define KEY_LEFTMETA		125
#define KEY_RIGHTMETA		126
#define KEY_COMPOSE		127

#define KEY_STOP		128	/* AC Stop */
#define KEY_AGAIN		129
#define KEY_PROPS		130	/* AC Properties */
#define KEY_UNDO		131	/* AC Undo */
#define KEY_FRONT		132
#define KEY_COPY		133	/* AC Copy */
#define KEY_OPEN		134	/* AC Open */
#define KEY_PASTE		135	/* AC Paste */
#define KEY_FIND		136	/* AC Search */
#define KEY_CUT			137	/* AC Cut */
#define KEY_HELP		138	/* AL Integrated Help Center */
#define KEY_MENU		139	/* Menu (show menu) */
#define KEY_CALC		140	/* AL Calculator */
#define KEY_SETUP		141
#define KEY_SLEEP		142	/* SC System Sleep */
#define KEY_WAKEUP		143	/* System Wake Up */
#define KEY_FILE		144	/* AL Local Machine Browser */
#define KEY_SENDFILE		145
#define KEY_DELETEFILE		146
#define KEY_XFER		147
#define KEY_PROG1		148
#define KEY_PROG2		149
#define KEY_WWW			150	/* AL Internet Browser */
#define KEY_MSDOS		151
#define KEY_COFFEE		152	/* AL Terminal Lock/Screensaver */
#define KEY_SCREENLOCK		KEY_COFFEE
#define KEY_ROTATE_DISPLAY	153	/* Display orientation for e.g. tablets */
#define KEY_DIRECTION		KEY_ROTATE_DISPLAY
#define KEY_CYCLEWINDOWS	154
#define KEY_MAIL		155
#define KEY_BOOKMARKS		156	/* AC Bookmarks */
#define KEY_COMPUTER		157
#define KEY_BACK		158	/* AC Back */
#define KEY_FORWARD		159	/* AC Forward */
#define KEY_CLOSECD		160
#define KEY_EJECTCD		161
#define KEY_EJECTCLOSECD	162
#define KEY_NEXTSONG		163
#define KEY_PLAYPAUSE		164
#define KEY_PREVIOUSSONG	165
#define KEY_STOPCD		166
#define KEY_RECORD		167
#define KEY_REWIND		168
#define KEY_PHONE		169	/* Media Select Telephone */
#define KEY_ISO			170
#define KEY_CONFIG		171	/* AL Consumer Control Configuration */
#define KEY_HOMEPAGE		172	/* AC Home */
#define KEY_REFRESH		173	/* AC Refresh */
#define KEY_EXIT		174	/* AC Exit */
#define KEY_MOVE		175
#define KEY_EDIT		176
#define KEY_SCROLLUP		177
#define KEY_SCROLLDOWN		178
#define KEY_KPLEFTPAREN		179
#define KEY_KPRIGHTPAREN	180
#define KEY_NEW			181	/* AC New */
#define KEY_REDO		182	/* AC Redo/Repeat */

#define KEY_F13			183
#define KEY_F14			184
#define KEY_F15			185
#define KEY_F16			186
#define KEY_F17			187
#define KEY_F18			188
#define KEY_F19			189
#define KEY_F20			190
#define KEY_F21			191
#define KEY_F22			192
#define KEY_F23			193
#define KEY_F24			194

#define KEY_PLAYCD		200
#define KEY_PAUSECD		201
#define KEY_PROG3		202
#define KEY_PROG4		203
#define KEY_ALL_APPLICATIONS	204	/* AC Desktop Show All Applications */
#define KEY_DASHBOARD		KEY_ALL_APPLICATIONS
#define KEY_SUSPEND		205
#define KEY_CLOSE		206	/* AC Close */
#define KEY_PLAY		207
#define KEY_FASTFORWARD		208
#define KEY_BASSBOOST		209
#define KEY_PRINT		210	/* AC Print */
#define KEY_HP			211
#define KEY_CAMERA		212
#define KEY_SOUND		213
#define KEY_QUESTION		214
#define KEY_EMAIL		215
#define KEY_CHAT		216
#define KEY_SEARCH		217
#define KEY_CONNECT		218
#define KEY_FINANCE		219	/* AL Checkbook/Finance */
#define KEY_SPORT		220
#define KEY_SHOP		221
#define KEY_ALTERASE		222
#define KEY_CANCEL		223	/* AC Cancel */
#define KEY_BRIGHTNESSDOWN	224
#define KEY_BRIGHTNESSUP	225
#define KEY_MEDIA		226

#define KEY_SWITCHVIDEOMODE	227	/* Cycle between available video
					   outputs (Monitor/LCD/TV-out/etc) */
#define KEY_KBDILLUMTOGGLE	228
#define KEY_KBDILLUMDOWN	229
#define KEY_KBDILLUMUP		230

#define KEY_SEND		231	/* AC Send */
#define KEY_REPLY		232	/* AC Reply */
#define KEY_FORWARDMAIL		233	/* AC Forward Msg */
#define KEY_SAVE		234	/* AC Save */
#define KEY_DOCUMENTS		235

#define KEY_BATTERY		236

#define KEY_BLUETOOTH		237
#define KEY_WLAN		238
#define KEY_UWB			239

#define KEY_UNKNOWN		240

#define KEY_VIDEO_NEXT		241	/* drive next video source */
#define KEY_VIDEO_PREV		242	/* drive previous video source */
#define KEY_BRIGHTNESS_CYCLE	243	/* brightness up, after max is min */
#define KEY_BRIGHTNESS_AUTO	244	/* Set Auto Brightness: manual
					  brightness control is off,
					  rely on ambient */
#define KEY_BRIGHTNESS_ZERO	KEY_BRIGHTNESS_AUTO
#define KEY_DISPLAY_OFF		245	/* display device to off state */

#define KEY_WWAN		246	/* Wireless WAN (LTE, UMTS, GSM, etc.) */
#define KEY_WIMAX		KEY_WWAN
#define KEY_RFKILL		247	/* Key that controls all radios */

#define KEY_MICMUTE		248	/* Mute / unmute the microphone */

/* Code 255 is reserved for special needs of AT keyboard driver */

#define BTN_MISC		0x100
#define BTN_0			0x100
#define BTN_1			0x101
#define BTN_2			0x102
#define BTN_3			0x103
#define BTN_4			0x104
#define BTN_5			0x105
#define BTN_6			0x106
#define BTN_7			0x107
#define BTN_8			0x108
#define BTN_9			0x109

#define BTN_MOUSE		0x110
#define BTN_LEFT		0x110
#define BTN_RIGHT		0x111
#define BTN_MIDDLE		0x112
#define BTN_SIDE		0x113
#define BTN_EXTRA		0x114
#define BTN_FORWARD		0x115
#define BTN_BACK		0x116
#define BTN_TASK		0x117

#define BTN_JOYSTICK		0x120
#define BTN_TRIGGER		0x120
#define BTN_THUMB		0x121
#define BTN_THUMB2		0x122
#define BTN_TOP			0x123
#define BTN_TOP2		0x124
#define BTN_PINKIE		0x125
#define BTN_BASE		0x126
#define BTN_BASE2		0x127
#define BTN_BASE3		0x128
#define BTN_BASE4		0x129
#define BTN_BASE5		0x12a
#define BTN_BASE6		0x12b
#define BTN_DEAD		0x12f

#define BTN_GAMEPAD		0x130
#define BTN_SOUTH		0x130
#define BTN_A			BTN_SOUTH
#define BTN_EAST		0x131
#define BTN_B			BTN_EAST
#define BTN_C			0x132
#define BTN_NORTH		0x133
#define BTN_X			BTN_NORTH
#define BTN_WEST		0x134
#define BTN_Y			BTN_WEST
#define BTN_Z			0x135
#define BTN_TL			0x136
#define BTN_TR			0x137
#define BTN_TL2			0x138
#define BTN_TR2			0x139
#define BTN_SELECT		0x13a
#define BTN_START		0x13b
#define BTN_MODE		0x13c
#define BTN_THUMBL		0x13d
#define BTN_THUMBR		0x13e

#define BTN_DIGI		0x140
#define BTN_TOOL_PEN		0x140
#define BTN_TOOL_RUBBER		0x141
#define BTN_TOOL_BRUSH		0x142
#define BTN_TOOL_PENCIL		0x143
#define BTN_TOOL_AIRBRUSH	0x144
#define BTN_TOOL_FINGER		0x145
#define BTN_TOOL_MOUSE		0x146
#define BTN_TOOL_LENS		0x147
#define BTN_TOOL_QUINTTAP	0x148	/* Five fingers on trackpad */
#define BTN_STYLUS3		0x149
#define BTN_TOUCH		0x14a
#define BTN_STYLUS		0x14b
#define BTN_STYLUS2		0x14c
#define BTN_TOOL_DOUBLETAP	0x14d
#define BTN_TOOL_TRIPLETAP	0x14e
#define BTN_TOOL_QUADTAP	0x14f	/* Four fingers on trackpad */

#define BTN_WHEEL		0x150
#define BTN_GEAR_DOWN		0x150
#define BTN_GEAR_UP		0x151

#define KEY_OK			0x160
#define KEY_SELECT		0x161
#define KEY_GOTO		0x162
#define KEY_CLEAR		0x163
#define KEY_POWER2		0x164
#define KEY_OPTION		0x165
#define KEY_INFO		0x166	/* AL OEM Features/Tips/Tutorial */
#define KEY_TIME		0x167
#define KEY_VENDOR		0x168
#define KEY_ARCHIVE		0x169
#define KEY_PROGRAM		0x16a	/* Media Select Program Guide */
#define KEY_CHANNEL		0x16b
#define KEY_FAVORITES		0x16c
#define KEY_EPG			0x16d
#define KEY_PVR			0x16e	/* Media Select Home */
#define KEY_MHP			0x16f
#define KEY_LANGUAGE		0x170
#define KEY_TITLE		0x171
#define KEY_SUBTITLE		0x172
#define KEY_ANGLE		0x173
#define KEY_ZOOM		0x174
#define KEY_MODE		0x175
#define KEY_KEYBOARD		0x176
#define KEY_SCREEN		0x177
#define KEY_PC			0x178	/* Media Select Computer */
#define KEY_TV			0x179	/* Media Select TV */
#define KEY_TV2			0x17a	/* Media Select Cable */
#define KEY_VCR			0x17b	/* Media Select VCR */
#define KEY_VCR2		0x17c	/* VCR Plus */
#define KEY_SAT			0x17d	/* Media Select Satellite */
#define KEY_SAT2		0x17e
#define KEY_CD			0x17f	/* Media Select CD */
#define KEY_TAPE		0x180	/* Media Select Tape */
#define KEY_RADIO		0x181
#define KEY_TUNER		0x182	/* Media Select Tuner */
#define KEY_PLAYER		0x183
#define KEY_TEXT		0x184
#define KEY_DVD			0x185	/* Media Select DVD */
#define KEY_AUX			0x186
#define KEY_MP3			0x187
#define KEY_AUDIO		0x188	/* AL Audio Browser */
#define KEY_VIDEO		0x189	/* AL Movie Browser */
#define KEY_DIRECTORY		0x18a
#define KEY_LIST		0x18b
#define KEY_MEMO		0x18c	/* Media Select Messages */
#define KEY_CALENDAR		0x18d
#define KEY_RED			0x18e
#define KEY_GREEN		0x18f
#define KEY_YELLOW		0x190
#define KEY_BLUE		0x191
#define KEY_CHANNELUP		0x192	/* Channel Increment */
#define KEY_CHANNELDOWN		0x193	/* Channel Decrement */
#define KEY_FIRST		0x194
#define KEY_LAST		0x195	/* Recall Last */
#define KEY_AB			0x196
#define KEY_NEXT		0x197
#define KEY_RESTART		0x198
#define KEY_SLOW		0x199
#define KEY_SHUFFLE		0x19a
#define KEY_BREAK		0x19b
#define KEY_PREVIOUS		0x19c
#define KEY_DIGITS		0x19d
#define KEY_TEEN		0x19e
#define KEY_TWEN		0x19f
#define KEY_VIDEOPHONE		0x1a0	/* Media Select Video Phone */
#define KEY_GAMES		0x1a1	/* Media Select Games */
#define KEY_ZOOMIN		0x1a2	/* AC Zoom In */
#define KEY_ZOOMOUT		0x1a3	/* AC Zoom Out */
#define KEY_ZOOMRESET		0x1a4	/* AC Zoom */
#define KEY_WORDPROCESSOR	0x1a5	/* AL Word Processor */
#define KEY_EDITOR		0x1a6	/* AL Text Editor */
#define KEY_SPREADSHEET		0x1a7	/* AL Spreadsheet */
#define KEY_GRAPHICSEDITOR	0x1a8	/* AL Graphics Editor */
#define KEY_PRESENTATION	0x1a9	/* AL Presentation App */
#define KEY_DATABASE		0x1aa	/* AL Database App */
#define KEY_NEWS		0x1ab	/* AL Newsreader */
#define KEY_VOICEMAIL		0x1ac	/* AL Voicemail */
#define KEY_ADDRESSBOOK		0x1ad	/* AL Contacts/Address Book */
#define KEY_MESSENGER		0x1ae	/* AL Instant Messaging */
#define KEY_DISPLAYTOGGLE	0x1af	/* Turn display (LCD) on and off */
#define KEY_BRIGHTNESS_TOGGLE	KEY_DISPLAYTOGGLE
#define KEY_SPELLCHECK		0x1b0   /* AL Spell Check */
#define KEY_LOGOFF		0x1b1   /* AL Logoff */

#define KEY_DOLLAR		0x1b2
#define KEY_EURO		0x1b3

#define KEY_FRAMEBACK		0x1b4	/* Consumer - transport controls */
#define KEY_FRAMEFORWARD	0x1b5
#define KEY_CONTEXT_MENU	0x1b6	/* GenDesc - system context menu */
#define KEY_MEDIA_REPEAT	0x1b7	/* Consumer - transport control */
#define KEY_10CHANNELSUP	0x1b8	/* 10 channels up (10+) */
#define KEY_10CHANNELSDOWN	0x1b9	/* 10 channels down (10-) */
#define KEY_IMAGES		0x1ba	/* AL Image Browser */

#define KEY_DEL_EOL		0x1c0
#define KEY_DEL_EOS		0x1c1
#define KEY_INS_LINE		0x1c2
#define KEY_DEL_LINE		0x1c3

#define KEY_FN			0x1d0
#define KEY_FN_ESC		0x1d1
#define KEY_FN_F1		0x1d2
#define KEY_FN_F2		0x1d3
#define KEY_FN_F3		0x1d4
#define KEY_FN_F4		0x1d5
#define KEY_FN_F5		0x1d6
#define KEY_FN_F6		0x1d7
#define KEY_FN_F7		0x1d8
#define KEY_FN_F8		0x1d9
#define KEY_FN_F9		0x1da
#define KEY_FN_F10		0x1db
#define KEY_FN_F11		0x1dc
#define KEY_FN_F12		0x1dd
#define KEY_FN_1		0x1de
#define KEY_FN_2		0x1df
#define KEY_FN_D		0x1e0
#define KEY_FN_E		0x1e1
#define KEY_FN_F		0x1e2
#define KEY_FN_S		0x1e3
#define KEY_FN_B		0x1e4

#define KEY_BRL_DOT1		0x1f1
#define KEY_BRL_DOT2		0x1f2
#define KEY_BRL_DOT3		0x1f3
#define KEY_BRL_DOT4		0x1f4
#define KEY_BRL_DOT5		0x1f5
#define KEY_BRL_DOT6		0x1f6
#define KEY_BRL_DOT7		0x1f7
#define KEY_BRL_DOT8		0x1f8
#define KEY_BRL_DOT9		0x1f9
#define KEY_BRL_DOT10		0x1fa

#define KEY_NUMERIC_0		0x200	/* used by phones, remote controls, */
#define KEY_NUMERIC_1		0x201	/* and other keypads */
#define KEY_NUMERIC_2		0x202
#define KEY_NUMERIC_3		0x203
#define KEY_NUMERIC_4		0x204
#define KEY_NUMERIC_5		0x205
#define KEY_NUMERIC_6		0x206
#define KEY_NUMERIC_7		0x207
#define KEY_NUMERIC_8		0x208
#define KEY_NUMERIC_9		0x209
#define KEY_NUMERIC_STAR	0x20a
#define KEY_NUMERIC_POUND	0x20b
#define KEY_NUMERIC_A		0x20c	/* Phone key A - HUT Telephony 0xb9 */
#define KEY_NUMERIC_B		0x20d
#define KEY_NUMERIC_C		0x20e
#define KEY_NUMERIC_D		0x20f

#define KEY_CAMERA_FOCUS	0x210
#define KEY_WPS_BUTTON		0x211	/* WiFi Protected Setup key */

#define KEY_TOUCHPAD_TOGGLE	0x212	/* Request switch touchpad on or off */
#define KEY_TOUCHPAD_ON		0x213
#define KEY_TOUCHPAD_OFF	0x214

#define KEY_CAMERA_ZOOMIN	0x215
#define KEY_CAMERA_ZOOMOUT	0x216
#define KEY_CAMERA_UP		0x217
#define KEY_CAMERA_DOWN		0x218
#define KEY_CAMERA_LEFT		0x219
#define KEY_CAMERA_RIGHT	0x21a

#define KEY_ATTENDANT_ON	0x21b
#define KEY_ATTENDANT_OFF	0x21c
#define KEY_ATTENDANT_TOGGLE	0x21d	/* Attendant call on or off */
#define KEY_LIGHTS_TOGGLE	0x21e	/* Reading light on or off */

#define BTN_DPAD_UP		0x220
#define BTN_DPAD_DOWN		0x221
#define BTN_DPAD_LEFT		0x222
#define BTN_DPAD_RIGHT		0x223

#define KEY_ALS_TOGGLE		0x230	/* Ambient light sensor */

#define KEY_BUTTONCONFIG		0x240	/* AL Button Configuration */
#define KEY_TASKMANAGER		0x241	/* AL Task/Project Manager */
#define KEY_JOURNAL		0x242	/* AL Log/Journal/Timecard */
#define KEY_CONTROLPANEL		0x243	/* AL Control Panel */
#define KEY_APPSELECT		0x244	/* AL Select Task/Application */
#define KEY_SCREENSAVER		0x245	/* AL Screen Saver */
#define KEY_VOICECOMMAND		0x246	/* Listening Voice Command */
#define KEY_ASSISTANT		0x247	/* AL Context-aware desktop assistant */

#define KEY_BRIGHTNESS_MIN		0x250	/* Set Brightness to Minimum */
#define KEY_BRIGHTNESS_MAX		0x251	/* Set Brightness to Maximum */

#define KEY_KBDINPUTASSIST_PREV		0x260
#define KEY_KBDINPUTASSIST_NEXT		0x261
#define KEY_KBDINPUTASSIST_PREVGROUP		0x262
#define KEY_KBDINPUTASSIST_NEXTGROUP		0x263
#define KEY_KBDINPUTASSIST_ACCEPT		0x264
#define KEY_KBDINPUTASSIST_CANCEL		0x265

/* Diagonal movement keys */
#define KEY_RIGHT_UP			0x266
#define KEY_RIGHT_DOWN			0x267
#define KEY_LEFT_UP			0x268
#define KEY_LEFT_DOWN			0x269

#define KEY_ROOT_MENU			0x26a /* Show Device's Root Menu */
/* Show Top Menu of the Media (e.g. DVD) */
#define KEY_MEDIA_TOP_MENU		0x26b
#define KEY_NUMERIC_11			0x26c
#define KEY_NUMERIC_12			0x26d
/*
 * Toggle Audio Description: refers to an audio service that helps blind and
 * visually impaired consumers understand the action in a program. Note: in
 * some countries this is referred to as "Video Description".
 */
#define KEY_AUDIO_DESC			0x26e
#define KEY_3D_MODE			0x26f
#define KEY_NEXT_FAVORITE		0x270
#define KEY_STOP_RECORD			0x271
#define KEY_PAUSE_RECORD		0x272
#define KEY_VOD				0x273 /* Video on Demand */
#define KEY_UNMUTE			0x274
#define KEY_FASTREVERSE			0x275
#define KEY_SLOWREVERSE			0x276
/*
 * Control a data application associated with the currently viewed channel,
 * e.g. teletext or data broadcast application (MHEG, MHP, HbbTV, etc.)
 */
#define KEY_DATA			0x277
#define KEY_ONSCREEN_KEYBOARD		0x278

#define BTN_TRIGGER_HAPPY		0x2c0
#define BTN_TRIGGER_HAPPY1		0x2c0
#define BTN_TRIGGER_HAPPY2		0x2c1
#define BTN_TRIGGER_HAPPY3		0x2c2
#define BTN_TRIGGER_HAPPY4		0x2c3
#define BTN_TRIGGER_HAPPY5		0x2c4
#define BTN_TRIGGER_HAPPY6		0x2c5
#define BTN_TRIGGER_HAPPY7		0x2c6
#define BTN_TRIGGER_HAPPY8		0x2c7
#define BTN_TRIGGER_HAPPY9		0x2c8
#define BTN_TRIGGER_HAPPY10		0x2c9
#define BTN_TRIGGER_HAPPY11		0x2ca
#define BTN_TRIGGER_HAPPY12		0x2cb
#define BTN_TRIGGER_HAPPY13		0x2cc
#define BTN_TRIGGER_HAPPY14		0x2cd
#define BTN_TRIGGER_HAPPY15		0x2ce
#define BTN_TRIGGER_HAPPY16		0x2cf
#define BTN_TRIGGER_HAPPY17		0x2d0
#define BTN_TRIGGER_HAPPY18		0x2d1
#define BTN_TRIGGER_HAPPY19		0x2d2
#define BTN_TRIGGER_HAPPY20		0x2d3
#define BTN_TRIGGER_HAPPY21		0x2d4
#define BTN_TRIGGER_HAPPY22		0x2d5
#define BTN_TRIGGER_HAPPY23		0x2d6
#define BTN_TRIGGER_HAPPY24		0x2d7
#define BTN_TRIGGER_HAPPY25		0x2d8
#define BTN_TRIGGER_HAPPY26		0x2d9
#define BTN_TRIGGER_HAPPY27		0x2da
#define BTN_TRIGGER_HAPPY28		0x2db
#define BTN_TRIGGER_HAPPY29		0x2dc
#define BTN_TRIGGER_HAPPY30		0x2dd
#define BTN_TRIGGER_HAPPY31		0x2de
#define BTN_TRIGGER_HAPPY32		0x2df
#define BTN_TRIGGER_HAPPY33		0x2e0
#define BTN_TRIGGER_HAPPY34		0x2e1
#define BTN_TRIGGER_HAPPY35		0x2e2
#define BTN_TRIGGER_HAPPY36		0x2e3
#define BTN_TRIGGER_HAPPY37		0x2e4
#define BTN_TRIGGER_HAPPY38		0x2e5
#define BTN_TRIGGER_HAPPY39		0x2e6
#define BTN_TRIGGER_HAPPY40		0x2e7

/* We avoid low common keys in module aliases so they don't get huge. */
#define KEY_MIN_INTERESTING	KEY_MUTE
#define KEY_MAX			0x2ff
#define KEY_CNT			(KEY_MAX+1)

/*
 * Relative axes
 */

#define REL_X			0x00
#define REL_Y			0x01
#define REL_Z			0x02
#define REL_RX			0x03
#define REL_RY			0x04
#define REL_RZ			0x05
#define REL_HWHEEL		0x06
#define REL_DIAL		0x07
#define REL_WHEEL		0x08
#define REL_MISC		0x09
#define REL_MAX			0x0f
#define REL_CNT			(REL_MAX+1)

/*
 * Absolute axes
 */

#define ABS_X			0x00
#define ABS_Y			0x01
#define ABS_Z			0x02
#define ABS_RX			0x03
#define ABS_RY			0x04
#define ABS_RZ			0x05
#define ABS_THROTTLE		0x06
#define ABS_RUDDER		0x07
#define ABS_WHEEL		0x08
#define ABS_GAS			0x09
#define ABS_BRAKE		0x0a
#define ABS_HAT0X		0x10
#define ABS_HAT0Y		0x11
#define ABS_HAT1X		0x12
#define ABS_HAT1Y		0x13
#define ABS_HAT2X		0x14
#define ABS_HAT2Y		0x15
#define ABS_HAT3X		0x16
#define ABS_HAT3Y		0x17
#define ABS_PRESSURE		0x18
#define ABS_DISTANCE		0x19
#define ABS_TILT_X		0x1a
#define ABS_TILT_Y		0x1b
#define ABS_TOOL_WIDTH		0x1c

#define ABS_VOLUME		0x20

#define ABS_MISC		0x28

/*
 * 0x2e is reserved and should not be used in input drivers.
 * It was used by HID as ABS_MISC+6 and userspace needs to detect if
 * the next ABS_* event is correct or is just ABS_MISC + n.
 * We define here ABS_RESERVED so userspace can rely on it and detect
 * the situation described above.
 */
#define ABS_RESERVED		0x2e

#define ABS_MT_SLOT		0x2f	/* MT slot being modified */
#define ABS_MT_TOUCH_MAJOR	0x30	/* Major axis of touching ellipse */
#define ABS_MT_TOUCH_MINOR	0x31	/* Minor axis (omit if circular) */
#define ABS_MT_WIDTH_MAJOR	0x32	/* Major axis of approaching ellipse */
#define ABS_MT_WIDTH_MINOR	0x33	/* Minor axis (omit if circular) */
#define ABS_MT_ORIENTATION	0x34	/* Ellipse orientation */
#define ABS_MT_POSITION_X	0x35	/* Center X touch position */
#define ABS_MT_POSITION_Y	0x36	/* Center Y touch position */
#define ABS_MT_TOOL_TYPE	0x37	/* Type of touching device */
#define ABS_MT_BLOB_ID		0x38	/* Group a set of packets as a blob */
#define ABS_MT_TRACKING_ID	0x39	/* Unique ID of initiated contact */
#define ABS_MT_PRESSURE		0x3a	/* Pressure on contact area */
#define ABS_MT_DISTANCE		0x3b	/* Contact hover distance */
#define ABS_MT_TOOL_X		0x3c	/* Center X tool position */
#define ABS_MT_TOOL_Y		0x3d	/* Center Y tool position */


#define ABS_MAX			0x3f
#define ABS_CNT			(ABS_MAX+1)

/*
 * Switch events
 */

#define SW_LID			0x00  /* set = lid shut */
#define SW_TABLET_MODE		0x01  /* set = tablet mode */
#define SW_HEADPHONE_INSERT	0x02  /* set = inserted */
#define SW_RFKILL_ALL		0x03  /* rfkill master switch, type "any"
					 set = radio enabled */
#define SW_RADIO		SW_RFKILL_ALL	/* deprecated */
#define SW_MICROPHONE_INSERT	0x04  /* set = inserted */
#define SW_DOCK			0x05  /* set = plugged into dock */
#define SW_LINEOUT_INSERT	0x06  /* set = inserted */
#define SW_JACK_PHYSICAL_INSERT 0x07  /* set = mechanical switch set */
#define SW_VIDEOOUT_INSERT	0x08  /* set = inserted */
#define SW_CAMERA_LENS_COVER	0x09  /* set = lens covered */
#define SW_KEYPAD_SLIDE		0x0a  /* set = keypad slide out */
#define SW_FRONT_PROXIMITY	0x0b  /* set = front proximity sensor active */
#define SW_ROTATE_LOCK		0x0c  /* set = rotate locked/disabled */
#define SW_LINEIN_INSERT	0x0d  /* set = inserted */
#define SW_MUTE_DEVICE		0x0e  /* set = device disabled */
#define SW_PEN_INSERTED		0x0f  /* set = pen inserted */
#define SW_MACHINE_COVER	0x10  /* set = cover closed */
#define SW_MAX			0x10
#define SW_CNT			(SW_MAX+1)

/*
 * Misc events
 */

#define MSC_SERIAL		0x00
#define MSC_PULSELED		0x01
#define MSC_GESTURE		0x02
#define MSC_RAW			0x03
#define MSC_SCAN		0x04
#define MSC_TIMESTAMP		0x05
#define MSC_MAX			0x07
#define MSC_CNT			(MSC_MAX+1)

/*
 * LEDs
 */

#define LED_NUML		0x00
#define LED_CAPSL		0x01
#define LED_SCROLLL		0x02
#define LED_COMPOSE		0x03
#define LED_KANA		0x04
#define LED_SLEEP		0x05
#define LED_SUSPEND		0x06
#define LED_MUTE		0x07
#define LED_MISC		0x08
#define LED_MAIL		0x09
#define LED_CHARGING		0x0a
#define LED_MAX			0x0f
#define LED_CNT			(LED_MAX+1)

/*
 * Autorepeat values
 */

#define REP_DELAY		0x00
#define REP_PERIOD		0x01
#define REP_MAX			0x01
#define REP_CNT			(REP_MAX+1)

/*
 * Sounds
 */

#define SND_CLICK		0x00
#define SND_BELL		0x01
#define SND_TONE		0x02
#define SND_MAX			0x07
#define SND_CNT			(SND_MAX+1)

#endif

export JD_COOKIE="pt_key=AAJigHn3ADDMfp6EWwz1eqx0dswbQBarLDcwBP4B1eXRJBX0vdjboMlJAPTTHSOm4cc6eFZhiEo;pt_pin=jd_5a825106a0c33;&pt_key=AAJiiQXnADDUhCbDf9NWTb7tdKW4-D1lgSr34KR1jw8ufU8c3taTz9BzOSuDMdrKyCWkhhCvSVE;pt_pin=jd_6415bc2fe3a90;"
指令模式:Esc
编辑模式:i(插入) a(下一个字节插入) o(下一行插入)
复制:yy
多行复制:3yy
粘贴:p
删除:dd
多行删除:3dd
上翻页:ctrl + u
下翻页:ctrl+ d
最后一行:GG
第一行:gg
保存退出:
1)Esc
2)shift+":" 按出:
3)w保存
4)q退出
5)wq保存退出 
6)q!不保存强制退出
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>

int main()
{
    int fd;
    fd = open("/dev/fb0", O_RDWR);
    if (fd<0)
    {
        perror("open lcd fail");
        return  -1;
    }
    // LCD MAP
    int *addr;
    addr = mmap(NULL,800*480*4, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
    if (addr == NULL)
    {
        perror("mman fail");
        return -1;
    }
    // 写入lcd
    int x,y;
    int green = 0x0000ff00;
    int red = 0x00ff0000;
    int blue = 0x00000ff;
    // 0-479
    for (y=0;y<480;y++)
    {
        for (x = 0; x < 800; x++)
        {
            if (y < 160) *(addr + y*800+x) = 0x00000000;
            else if (160< y && y< 320) *(addr + y*800+x) = 0x00ff0000;
            else   *(addr + y*800+x) = 0x00ffcc00;
        }
    }
    munmap(addr,800*480*4);
    close(fd);
    return 0;
}

到了这里,关于2022.5.11-5.18粤嵌课程记录的文章就介绍完了。如果您还想了解更多内容,请在右上角搜索TOY模板网以前的文章或继续浏览下面的相关文章,希望大家以后多多支持TOY模板网!

本文来自互联网用户投稿,该文观点仅代表作者本人,不代表本站立场。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如若转载,请注明出处: 如若内容造成侵权/违法违规/事实不符,请点击违法举报进行投诉反馈,一经查实,立即删除!

领支付宝红包 赞助服务器费用

相关文章

  • 【C/C++每日一练】总目录(2023.2.18~5.18)共90篇

    2023.2.18~2023.5.18 连载三个月共90篇,暂停更  20230518 1. Excel表列序号  🌟 2. 移除元素  🌟 3. 接雨水  🌟🌟🌟 20230517 1. 排序问题  🌟 2. 查找小值  🌟 3. 寻找峰值  🌟🌟 20230516 1. 买卖股票的最佳时机  🌟 2. 两数相加  🌟🌟 3. 二叉树的后序遍历  🌟 20230515 1. 区间

    2024年02月05日
    浏览(34)
  • MS VC 2022开发Linux应用记录之01篇

    安装MSVS2022的时候勾上对开发Linux C++程序的选项 在Windows中安装Oracle Virtual Box程序,在里面安装Ubuntu最新稳定版,要选择多个CPU核 在VirtualBox中添加一个网卡,选择Host Only 在虚拟机中使用ifconfig命令,在宿主机中使用ipconfig, 可以看到两者存在同一网段的网址 在虚拟机中安装必要开

    2024年02月16日
    浏览(33)
  • 粤嵌Linux GEC6818开发板实现电子相册

    最近学校要求使用粤嵌的开发板实现电子相册,具体的功能要有点击特定的区域实现上一张、下一张、自动播放图片、黑屏退出应用程序、左右滑动切换图片相关功能。其中涉及到的知识点也比较多(文件IO、内存映射、触摸屏、bmp图片格式、进程、线程创建和同步、字符串

    2024年02月04日
    浏览(54)
  • 嵌入式培训机构四个月实训课程笔记(完整版)-Linux ARM驱动编程第三天-ARM Linux ADC和触摸屏开发 (物联技术666)

    链接:https://pan.baidu.com/s/1V0E9IHSoLbpiWJsncmFgdA?pwd=1688 提取码:1688   教学内容: 1 、 ADC S3C2440 的 A/D 转换器包含一个 8 通道的模拟输入转换器,可以将模拟输入信号转换成 10 位数字编码。 在 A/D 转换时钟频率为 2.5MHz 时,其最大转换率为 500KSPS ( 5 个时钟周期完成一次转换) 输

    2024年02月20日
    浏览(55)
  • 记录移植Python3到arm开发板linux系统中

    开发板情况 arm板是公司采购的工控机。主要用来 使用python3解析excel表格处理数据。 配置如下: 配置 版本 cpu imx6dl(armv7架构) 操作系统 linux3.10 python版本 2.7 项目情况 项目中最好使用 python3 。可行的有以下几种方式: 方式 优缺点 可行度 重做文件系统 订制程度比较高,后期增

    2024年02月04日
    浏览(51)
  • socket套接字通信 TCP传输控制协议/IP网络协议 5.18

    B/S :浏览器和服务器 C/S :客户机和服务器 网络的层次结构和每层所使用协议的集合 网络采用分层管理的方法,将网络的功能划分为不同的模块 OSI模型: 共7种: 数据的封装与传递过程: 网络传输数据大小user data: 6~1460 网络传输中容易发生拆包和粘包,所以接收和发送的字节

    2024年02月05日
    浏览(79)
  • Windows 11 简体中文版、英文版 (x64、ARM64) 下载 (updated Jun 2022)

    Windows 11 正式版,2022 年 6 月更新 请访问原文链接:https://sysin.org/blog/windows-11/,查看最新版。原创作品,转载请保留出处。 作者主页:www.sysin.org 全新 Windows 体验,让您与热爱的人和事物离得更近。 获得全新视角 Windows 11 提供一个让人平静而富有创意的空间,全新体验引导您

    2024年02月03日
    浏览(50)
  • 2022-11-10 工作记录--HTML-video视频铺满播放

    一、实现效果 ⭐️ 1、未铺满播放 ❎ 2、铺满播放 ✅ 二、实现代码 ⭐️ 以 react 为例 1、未铺满播放 ❎ homePage.jsx homePage.less 2、铺满播放 ✅ 给 video 加上样式: object-fit: cover; ,实现 ios 和 android 都兼容。 homePage.jsx homePage.less 哒哒哒哒~ biu biu biu~

    2024年02月14日
    浏览(37)
  • 嵌入式培训机构四个月实训课程笔记(完整版)-Linux ARM驱动编程第五天-ARM Linux编程之设备节点 (物联技术666)

    链接:https://pan.baidu.com/s/1hOBKyRom-4EZMBpFn1H9kQ?pwd=1688 提取码:1688  Linux设备节点 设备管理是linux中比较基础的东西,但是由于Linux智能程度的越来越高,Udev的使用越来越广泛,使得越来越多的Linux新用户对 /dev 目录下的东西变得不再熟悉。有时候遇见问题就会变得抓狂 本文是我

    2024年02月22日
    浏览(51)
  • [linux]Ubuntu 18.04安装arm-linux-gcc交叉编译器的两种方法

    第一种:apt安装法: Ctrl+Alt+T弹出终端,使用如下命令进行arm-linux-gcc的安装:   使用如下命令进行arm-linux-g++的安装:   如果要卸载时使用如下命令进行移除,arm-linux-gcc的卸载:   arm-linux-g++的卸载:  第二种源码安装: 目前网上搜索发现,最多人安装的是4.4.3版本的

    2024年02月05日
    浏览(58)

觉得文章有用就打赏一下文章作者

支付宝扫一扫打赏

博客赞助

微信扫一扫打赏

请作者喝杯咖啡吧~博客赞助

支付宝扫一扫领取红包,优惠每天领

二维码1

领取红包

二维码2

领红包