R36 Ultra Framebuffer Demo - ARM64 Build

✅ Successfully Compiled for ARM64!

The program has been cross-compiled for ARM64 (aarch64) architecture.

Files

• framebuffer_simple.c - Pure C implementation (no dependencies)
• framebuffer_demo.vala - Vala implementation (requires GLib)
• framebuffer_demo - ARM64 binary (statically linked, ready to run)
• compile_simple.sh - Compilation script for C version

Binary Information

framebuffer_demo: ELF 64-bit LSB executable, ARM aarch64, statically linked

This binary is:

• ✅ Compiled for ARM64 (R36 Ultra architecture)
• ✅ Statically linked (no dependencies needed)
• ✅ Ready to transfer and run on R36 Ultra

Transfer to R36 Ultra

Option 1: SCP (Network Transfer)

scp framebuffer_demo user@r36ultra-ip:/home/user/

Option 2: USB/SD Card

1. Copy framebuffer_demo to USB drive or SD card
2. Insert into R36 Ultra
3. Copy to device

Running on R36 Ultra

chmod +x framebuffer_demo
sudo ./framebuffer_demo

What It Does

The program:

1. Opens /dev/fb0 framebuffer (720x720, BGRA format)
2. Draws colorful shapes:
   • Red rectangle
   • Green circle
   • Blue rectangle
   • Yellow circle
3. Waits for Enter key
4. Clears screen and exits

Recompiling

For ARM64 (cross-compile):

./compile_simple.sh arm64

For native (x86_64):

./compile_simple.sh

Customization

Edit framebuffer_simple.c and use these functions:

• fill_screen(fb, b, g, r, a) - Fill screen with color
• set_pixel(fb, x, y, b, g, r, a) - Set individual pixel
• draw_rectangle(fb, x, y, w, h, b, g, r, a) - Draw rectangle
• draw_circle(fb, cx, cy, radius, b, g, r, a) - Draw circle
• fb_update(fb) - Write to framebuffer

Note: Colors are in BGRA format (Blue, Green, Red, Alpha)

Advantages of C Version

• ✅ No dependencies (pure C, statically linked)
• ✅ Easy cross-compilation
• ✅ Small binary size
• ✅ Fast execution
• ✅ Works on any ARM64 Linux system