Initial commit

Kobo_dev/screen.c

@@ -0,0 +1,66 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <linux/fb.h>
+#include <sys/ioctl.h>
+
+int main() {
+    const char *fb_path = "/dev/fb0";
+    const char *output_dir = "/mnt/onboard/screenshots/";
+
+    int fb = open(fb_path, O_RDONLY);
+    if (fb < 0) {
+        perror("open framebuffer");
+        return 1;
+    }
+
+    struct fb_var_screeninfo vinfo;
+    if (ioctl(fb, FBIOGET_VSCREENINFO, &vinfo)) {
+        perror("ioctl");
+        close(fb);
+        return 1;
+    }
+
+    int width  = vinfo.xres;
+    int height = vinfo.yres;
+    int bpp    = vinfo.bits_per_pixel;
+
+    size_t screensize = width * height * (bpp / 8);
+    unsigned char *buffer = malloc(screensize);
+    if (!buffer) {
+        perror("malloc");
+        close(fb);
+        return 1;
+    }
+
+    int counter = 0;
+    while (1) {
+        if (lseek(fb, 0, SEEK_SET) < 0) {  // torna all'inizio del framebuffer
+            perror("lseek");
+            break;
+        }
+
+        if (read(fb, buffer, screensize) != screensize) {
+            perror("read");
+            break;
+        }
+
+        char filename[256];
+        snprintf(filename, sizeof(filename), "%s/screen%03d.raw", output_dir, counter++);
+        FILE *out = fopen(filename, "wb");
+        if (!out) {
+            perror("fopen");
+            break;
+        }
+
+        fwrite(buffer, 1, screensize, out);
+        fclose(out);
+
+        sleep(1);
+    }
+
+    free(buffer);
+    close(fb);
+    return 0;
+}