Implement LED blink module

- Added main loop to toggle LED using peripherals module
- Introduced simple busy-wait delay for visible blinking
- Uses cortex_m::asm::nop() for safe CPU wait
- Fully no_std and no_main compatible for embedded targets
- Prepares code for future timer-based non-blocking blink

Author: m-a-h-b-u-b

examples/blinky.rs

@@ -1,19 +1,39 @@
-//! M2 Bootloader RUST 
-//! ------------------
+//! M2 Bootloader RUST Blink Module
+//! -------------------------------
 //! License : Dual License
 //!           - Apache 2.0 for open-source / personal use
 //!           - Commercial license required for closed-source use
 //! Author  : Md Mahbubur Rahman
 //! URL     : <https://m-a-h-b-u-b.github.io>
-//! GitHub  : <https://github.com/m-a-h-b-u-b/M2-Bootloader-RUST>
+//! GitHub  : <https://github.com/m-a-h-b-u-b/M2-Bootloader-Rust>
 
 #![no_std]
 #![no_main]
+
+use cortex_m::asm;
 use cortex_m_rt::entry;
 
+mod peripherals;
+
 #[entry]
 fn main() -> ! {
+    // Initialize LED
+    peripherals::init_led();
+
     loop {
-        // Blink LED
+        // Toggle LED state
+        peripherals::toggle_led();
+
+        // Simple busy-wait delay for visible blink
+        delay();
+    }
+}
+
+/// Busy-wait delay function
+#[inline(always)]
+fn delay() {
+    // Adjust this value according to your MCU clock speed
+    for _ in 0..5_000_000 {
+        asm::nop();
     }
-}
+}