initial

tools/clearfb.py

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+import os
+import fcntl
+import struct
+import mmap
+from time import sleep
+
+with open('/dev/tty1', 'w') as tty:
+    tty.write("\033[?25l")
+
+
+# Constants for the ioctl call
+FBIOGET_VSCREENINFO = 0x4600
+
+# Define a function to perform an ioctl call to get screen info
+def get_screen_info(fb_device):
+    # We will get the variable screen info (resolution and bits per pixel)
+    # The struct for variable screen info is defined in the Linux kernel headers
+    # as fb_var_screeninfo, which is 56 bytes
+    screen_info_format = '8I12I16I2I'
+    screen_info = struct.pack(screen_info_format, *([0] * 38))
+    screen_info = fcntl.ioctl(fb_device, FBIOGET_VSCREENINFO, screen_info)
+    return struct.unpack(screen_info_format, screen_info)
+
+# Open the framebuffer device in read-write mode
+with open("/dev/fb0", "r+b") as fb:
+    # Get screen information using ioctl
+    info = get_screen_info(fb)
+    xres, yres, bits_per_pixel = info[0], info[1], info[6]
+    screensize = xres * yres * bits_per_pixel // 8
+    
+    # Create a memory-mapped area to the framebuffer
+    fb_bytes = mmap.mmap(fb.fileno(), screensize, mmap.MAP_SHARED, mmap.PROT_WRITE | mmap.PROT_READ)
+    
+    # Now you can write pixel data to the framebuffer
+    # Here is an example that just sets all pixels to black
+    fb_bytes.seek(0)  # Go to the beginning of the framebuffer
+    fb_bytes.write(b'\x00' * screensize)
+    
+    # Your framebuffer application code here
+    
+    # Once your program is finished, you can unmap and close the framebuffer device
+    fb_bytes.close()
+
+import sys
+import termios
+import atexit
+from select import select
+
+# Save the terminal settings
+fd = sys.stdin.fileno()
+old_settings = termios.tcgetattr(fd)
+atexit.register(lambda: termios.tcsetattr(fd, termios.TCSADRAIN, old_settings))
+
+def wait_for_key_press():
+    # Disable canonical input and echo
+    new_settings = termios.tcgetattr(fd)
+    new_settings[3] = new_settings[3] & ~termios.ICANON & ~termios.ECHO
+    termios.tcsetattr(fd, termios.TCSADRAIN, new_settings)
+
+    # Wait for input
+    rlist, _, _ = select([sys.stdin], [], [], None)
+    if rlist:
+        sys.stdin.read(1)
+
+# Call the function to wait for any key press
+wait_for_key_press()
+
+with open('/dev/tty1', 'w') as tty:
+    tty.write("\033[0;0H")
+    tty.write("\033[?5h\033[?5l")
+    tty.write("\033[?25h")
+