嵌入式linux应用开发完全手册光盘里的驱动和例子源代码

/***************************************** Copyright 2001-2003 Sigma Designs, Inc. All Rights Reserved Proprietary and Confidential *****************************************/ #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <stdio.h> #include <stdlib.h> #include <sys/mman.h> #include <sys/time.h> #include "fb.h" #define ALLOW_OS_CODE 1 /*#include "../rua/include/rua.h"*/ #if 0 #define DEB(f) (f) #else #define DEB(f) #endif typedef unsigned char RMuint8; typedef unsigned short RMuint16; typedef unsigned int RMuint32; struct fb_var_screeninfo fb_var; struct fb_fix_screeninfo fb_fix; char * fb_base_addr = NULL; /* Set a pixel color * @param p_osd osd descriptor * @param x * @param y * @color 0xAARRGGBB (AA = alpha : 0 transparent) */ static void set_pixel(RMuint32 x, RMuint32 y, RMuint32 color) { /*static RMuint32 i=0;*/ /* TODO We assume for now we have contigus regions */ switch (fb_var.bits_per_pixel){ case 32: { RMuint32 *addr= (RMuint32 *)fb_base_addr+(y*fb_var.xres+x); *addr = color; } break; case 24: { /*RMuint32 *addr= (RMuint32 *)fb_base_addr+(y*fb_var.xres+x); *addr = (0x00FFFFFF) & color;*/ RMuint8 *addr = (RMuint8 *)fb_base_addr+(y*fb_var.xres+x)*3; *addr = (RMuint8) (color & 0xFF); *(addr+1) = (RMuint8) (color >> 8 & 0xFF); *(addr+2) = (RMuint8) (color >> 16 & 0xFF); } break; case 16: { RMuint16 *addr = (RMuint16 *) fb_base_addr+(y*fb_var.xres+x); *addr = (RMuint16) color; } break; case 8: { RMuint8 *addr = (RMuint8 *)fb_base_addr+(y*fb_var.xres+x); *addr = (RMuint8) color; } break; case 4: { RMuint8 *addr = (RMuint8 *)fb_base_addr+(y*fb_var.xres+x) / 2; RMuint32 bit = (RMuint32) ((RMuint8 *)fb_base_addr+(y*fb_var.xres+x) % 2); RMuint8 pixel = *addr; pixel = pixel & ( 0x0F << bit * 4 ); color = ( color & 0x0000000F ) << 4; *addr = pixel | ( (RMuint8) color >> bit * 4 ); } break; case 2: { RMuint8 *addr = (RMuint8 *)fb_base_addr+(y*fb_var.xres+x) / 4; RMuint32 bit = (RMuint32) ((RMuint8 *)fb_base_addr+(y*fb_var.xres+x) % 4); RMuint8 pixel = *addr; pixel = pixel & ( 0xFF ^ ( 0x3 << bit * 2)); color = color & 0x00000003; *addr = pixel | ( (RMuint8) color << bit * 2 ); } break; case 1: { /*RMuint8 *addr = (RMuint8 *)fb_base_addr+(y*fb_var.xres+x); *addr = (RMuint8) color;*/ RMuint8 *addr = (RMuint8 *)fb_base_addr+(y*fb_var.xres+x) / 8; RMuint32 bit = (RMuint32) ((RMuint8 *)fb_base_addr+(y*fb_var.xres+x) % 8); RMuint8 pixel = *addr; pixel = pixel & ( 0xFF ^ ( 0x1 << bit )); color = color & 0x00000001; *addr = pixel | ( (RMuint8) color << bit ); } break; default: fprintf(stderr,"Unknown bpp : %d\n",fb_var.bits_per_pixel); break; } /*if (i<10){ DEB(fprintf(stderr,"(%ld,%ld) [%p] <- %lX\n",x,y,addr,*addr)); i++; }*/ } static void mire() { RMuint32 x,y; RMuint32 color; RMuint8 red,green,blue,alpha; DEB(fprintf(stderr,"begin mire\n")); for (y=0;y<fb_var.yres;y++) for (x=0;x<fb_var.xres;x++){ color = ((x-fb_var.xres/2)*(x-fb_var.xres/2) + (y-fb_var.yres/2)*(y-fb_var.yres/2))/64; red = (color/8) % 256; green = (color/4) % 256; blue = (color/2) % 256; alpha = (color*2) % 256; /*alpha = 0xFF;*/ color |= ((RMuint32)alpha << 24); color |= ((RMuint32)red << 16); color |= ((RMuint32)green << 8 ); color |= ((RMuint32)blue ); set_pixel(x,y,color); } DEB(fprintf(stderr,"end mire\n")); } void printusage(char *name) { fprintf(stderr,"Usage (example): %s /dev/fb/0\n", name); fprintf(stderr," %s /dev/fb/0 set <width> <height> <bpp>\n",name); fprintf(stderr," %s /dev/fb/0 r8 <offset> <num>\n",name); fprintf(stderr," %s /dev/fb/0 w8 <offset> <val> <num>\n",name); fprintf(stderr," %s /dev/fb/0 r16 <offset> <num>\n",name); fprintf(stderr," %s /dev/fb/0 w16 <offset> <val> <num>\n",name); fprintf(stderr," %s /dev/fb/0 r32 <offset> <num>\n",name); fprintf(stderr," %s /dev/fb/0 w32 <offset> <val> <num>\n",name); } int main(int argc, char** argv) { int fd = 0; long int screensize = 0; unsigned int width = 0; unsigned int height = 0; unsigned int bpp = 0; unsigned int *pdwAddr = 0; unsigned short *pwAddr = 0; unsigned char *pcAddr = 0; unsigned int dwOffset; unsigned int dwVal; unsigned int num; int i; if (argc < 2) { printusage(argv[0]); return -1; } fd = open(argv[1],O_RDWR); if (fd <0){ printf("error opening %s\n",argv[1]); exit(1); } /* Get fixed screen information */ if (ioctl(fd, FBIOGET_FSCREENINFO, &fb_fix)) { printf("Error reading fb fixed information.\n"); exit(1); } /* Get variable screen information */ if (ioctl(fd, FBIOGET_VSCREENINFO, &fb_var)) { printf("Error reading fb variable information.\n"); exit(1); } if (!strcmp(argv[1], "set")) { width = strtoul(argv[3], 0, 0); height = strtoul(argv[4], 0, 0); bpp = strtoul(argv[5], 0, 0); if (!width || !height || !bpp) { printusage(argv[0]); return 0; } printf("Change fb as %dx%d, %dbpp\n", width, height, bpp); fb_var.xres = fb_var.xres_virtual = width; fb_var.yres = fb_var.yres_virtual = height; fb_var.bits_per_pixel = bpp; if (ioctl(fd, FBIOPUT_VSCREENINFO, &fb_var)) { printf("Error Set fb variable information.\n"); exit(1); } } if ((argc == 2) || (argc > 2 && !strcmp(argv[2], "set"))) { printf("fb_var_screeninfo values:\n"); printf(" xres: %d\n", fb_var.xres); /* visible resolution */ printf(" yres: %d\n", fb_var.yres); printf(" xres_virtual: %d\n", fb_var.xres_virtual); /* virtual resolution */ printf(" yres_virtual: %d\n", fb_var.yres_virtual); printf(" xoffset: %d\n", fb_var.xoffset); /* offset from virtual to visible */ printf(" yoffset: %d\n", fb_var.yoffset); /* resolution */ printf(" bits_per_pixel: %d\n", fb_var.bits_per_pixel); printf(" grayscale: %d\n", fb_var.grayscale); /* != 0 Graylevels instead of colors */ printf(" red.offset: %d\n", fb_var.red.offset); /* bitfield in fb mem if true color, */ printf(" red.length: %d\n", fb_var.red.length); /* else only length is significant */ printf(" red.msb_right: %d\n", fb_var.red.msb_right); printf(" green.offset: %d\n", fb_var.green.offset); /* bitfield in fb mem if true color, */ printf(" green.length: %d\n", fb_var.green.length); /* else only length is significant */ printf(" green.msb_right:%d\n", fb_var.green.msb_right); printf(" blue.offset: %d\n", fb_var.blue.offset); /* bitfield in fb mem if true color, */ printf(" blue.length: %d\n", fb_var.blue.length); /* else only length is significant */ printf(" blue.msb_right: %d\n", fb_var.blue.msb_right); printf(" transp.offset: %d\n", fb_var.transp.offset); /* transparency */ printf(" transp.length: %d\n", fb_var.transp.length); printf(" transp.msb_right:%d\n", fb_var.transp.msb_right); printf(" nonstd: %d\n", fb_var.nonstd); /* != 0 Non standard pixel format */ printf(" activate: %d\n", fb_var.activate); /* see FB_ACTIVATE_* */ printf(" height: %d\n", fb_var.height); /* height of picture in mm */ printf(" width: %d\n", fb_var.width); /* width of picture in mm */ printf(" accel_flags: %d\n", fb_var.accel_flags); /* acceleration flags (hints) */ /* Timing: All values in pixclocks, except pixclock (of course) */ printf(" pixclock: