测试framebuffer的简单例子
2012-10-18 12:56
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测试fb
#include <unistd.h> #include <stdio.h> #include <fcntl.h> #include <linux/fb.h> #include <sys/mman.h> int main() { int fbfd = 0; struct fb_var_screeninfo vinfo; struct fb_fix_screeninfo finfo; long int screensize = 0; char *fbp = 0; int x = 0, y = 0; long int location = 0; /* Open the file for reading and writing */ fbfd = open("/dev/fb0", O_RDWR); if (!fbfd) { printf("Error: cannot open framebuffer device.\n"); exit(1); } printf("The framebuffer device was opened successfully.\n"); /* Get fixed screen information */ if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo)) { printf("Error reading fixed information.\n"); exit(2); } /* Get variable screen information */ if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo)) { printf("Error reading variable information.\n"); exit(3); } /* 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) { printf("Error: failed to map framebuffer device to memory.\n"); exit(4); } printf("The framebuffer device was mapped to memory successfully.\n"); x = 200; y = 100; /* Where we are going to put the pixel */ /* Figure out where in memory to put the pixel */ location = (x+vinfo.xoffset) * (vinfo.bits_per_pixel/8) +(y+vinfo.yoffset) * finfo.line_length; *(fbp + location) = 100; /* Some blue */ *(fbp + location + 1) = 15; /* A little green */ *(fbp + location + 2) = 200; /* A lot of red */ *(fbp + location + 3) = 0; /* No transparency */ munmap(fbp, screensize); close(fbfd); return 0; }
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