@anruliu 以下是代码,请帮忙看一下,感谢大佬
#include "stdio.h"
#include "stdint.h"
#include "string.h"
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include "fbio.h"
#include "linux/fb.h"
#include <unistd.h>
#include <sys/time.h>
#include "stdio.h"
#define FBDEV_PATH "/dev/fb0"
int fbfd = 0;
struct fb_var_screeninfo vinfo;
uint8_t * fbdev_init() {
uint8_t * fbp = 0;
struct fb_fix_screeninfo finfo;
uint32_t screensize = 0;
fbfd = open(FBDEV_PATH, O_RDWR);
if(fbfd == -1) {
perror("Error: cannot open framebuffer device");
return fbp;
}
printf("The framebuffer device was opened successfully.\n");
struct fbtype fb;
unsigned line_length;
// Get fixed screen information
if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo) == -1) {
perror("Error reading fixed information");
return fbp;
}
// Get variable screen information
if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo) == -1) {
perror("Error reading variable information");
return fbp;
}
// Figure out the size of the screen in bytes
screensize = finfo.smem_len; //finfo.line_length * vinfo.yres;
// Map the device to memory
fbp = (char *)mmap(0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED, fbfd, 0);
printf("%dx%d, %dbpp, size: %d; ptr: %08X\n", vinfo.xres, vinfo.yres, vinfo.bits_per_pixel, screensize, fbp);
if ((intptr_t)fbp == -1) {
perror("Error: failed to map framebuffer device to memory");
return fbp;
}
memset(fbp, 0x00, screensize);
return fbp;
}
void fb_try_pan(uint32_t offset) {
vinfo.xoffset = 0;
vinfo.yoffset = offset;
vinfo.activate = FB_ACTIVATE_VBL;
int res = ioctl(fbfd, FBIOPAN_DISPLAY, &vinfo);
if (res==-1) {
printf("fb_try_pan res: %d\n", res);
perror("fb_try_pan res:");
}
}
int cur_fb=0;
void fill_fb(uint32_t * fb, uint32_t pattern) {
struct timeval tv;
uint32_t fb_num=1;
if (cur_fb==1) { // Draw on inactive buf
fb_num=0;
}
gettimeofday(&tv,NULL);
long st = 1000000 * tv.tv_sec + tv.tv_usec;
printf("Draw on buf %d. Current buf: %d\n", fb_num, cur_fb);
for (uint32_t i=0; i<1024*600; i++) {
fb[i+fb_num*1024*600]=pattern;
}
if (cur_fb==1) { // Draw on inactive buf
printf("Activate buf 0\n");
fb_try_pan(600);
fb_try_pan(0);
cur_fb=0;
}
else
{
printf("Activate buf 1\n");
fb_try_pan(0);
fb_try_pan(600);
cur_fb=1;
}
gettimeofday(&tv,NULL);
long end = 1000000 * tv.tv_sec + tv.tv_usec;
long t=end-st;
printf("time: %d, fps: %d\n", t, 1000000/t);
usleep(1000000);
}
int main(void) {
uint32_t * fb;
printf("Hello my T133 board\n");
fb=(uint32_t *)fbdev_init();
if (fb==NULL) {
return 0;
}
fb_try_pan(0);
while (1) {
printf("RED!!!\n");
fill_fb(fb, 0x01FF0000);
printf("GREEN!!!\n");
fill_fb(fb, 0x0100FF00);
printf("BLUE!!!\n");
fill_fb(fb, 0x010000FF);
printf("BLACK!!!\n");
fill_fb(fb, 0x01000000);
printf("WHITE!!!\n");
fill_fb(fb, 0x01FFFFFF);
}
#endif
}