参考https://bbs.elecfans.com/jishu_2303737_1_1.html的ssh登录配置等。
apt install lrzsz安装sz rz工具
rz是导入文件到开发板
sz相反
安装后,crt中ssh登录开发板后,就可以输入rz回车
自动弹出选择文件对话框选择文件,点击Add点击Ok就可发送到开发板
sz 文件名
则从开发板下载到本地
输出的路径可以配置
右键点击连接->Session Options...
配置上传下载路径如下
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
int main(int argc, char *argv[])
{
int fd = -1;
int ret = -1;
uint8_t *p_fb = 0;
struct fb_fix_screeninfo finfo;
struct fb_var_screeninfo vinfo;
memset(&finfo,0,sizeof(finfo));
memset(&vinfo,0,sizeof(vinfo));
fd = open(argv[1],O_RDWR);
if(fd < 0)
{
fprintf(stderr,"open %s err, %sn",argv[1],strerror(errno));
return -1;
}
ret = ioctl(fd, FBIOGET_FSCREENINFO, &finfo);
if(ret < 0)
{
fprintf(stderr,"ioctl finfo err, %sn",strerror(errno));
close(fd);
return -1;
}
ret = ioctl(fd, FBIOGET_VSCREENINFO, &vinfo);
if(ret < 0)
{
fprintf(stderr,"ioctl vinfo err, %sn",strerror(errno));
close(fd);
return -1;
}
unsigned long len = vinfo.xres_virtual * vinfo.yres_virtual * vinfo.bits_per_pixel / 8;
p_fb = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if(p_fb == NULL)
{
fprintf(stderr,"mmap len %ld errn",len);
close(fd);
return -1;
}
fprintf(stderr,"x = %d y = %d bits = %d len = %ldn",vinfo.xres_virtual,vinfo.yres_virtual,vinfo.bits_per_pixel,len);
volatile int times = 30;
while(times--)
{
if(vinfo.bits_per_pixel == 16)
{
for(unsigned int i=0; i< len/2; )
{
*((uint16_t*)(p_fb + i)) = 0xF800;
i+=2;
}
usleep(atoi(argv[2])*1000);
for(unsigned int i=0; i< len/2;)
{
*((uint16_t*)(p_fb + i)) = 0x07E0;
i+=2;
}
usleep(atoi(argv[2])*1000);
for(unsigned int i=0; i< len/2;)
{
*((uint16_t*)(p_fb + i)) = 0x001F;
i+=2;
}
usleep(atoi(argv[2])*1000);
}
else
{
for(unsigned int i=0; i< len/4; )
{
*((uint32_t*)(p_fb + i)) = 0xFF0000;
i+=4;
}
usleep(atoi(argv[2])*1000);
for(unsigned int i=0; i< len/4;)
{
*((uint32_t*)(p_fb + i)) = 0x00FF00;
i+=4;
}
usleep(atoi(argv[2])*1000);
for(unsigned int i=0; i< len/4;)
{
*((uint32_t*)(p_fb + i)) = 0x0000FF;
i+=4;
}
usleep(atoi(argv[2])*1000);
}
}
munmap(p_fb,len);
close(fd);
return 0;
}
rz导入到开发板
编译
gcc framebuffer.c -o framebuffer
运行
./framebuffer /dev/fb0 200
可以看到以200ms间隔 rgb刷屏 30次。
测试framebuffer和hdmi显示ok,后续就可以基于此进行相应的图形程序的开发。
比如移植lvgl等。
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