MCU LED Now turns on!

src/main.rs

@@ -10,12 +10,22 @@ use panic_halt as _; // you can put a breakpoint on `rust_begin_unwind` to catch
 use cortex_m::asm;
 use cortex_m_rt::entry;
 use cortex_m_semihosting::hprintln;
+use stm32f1::stm32f103;
 
 #[entry]
 fn main() -> ! {
     asm::nop(); // To not have main optimize to abort in release mode, remove when you add code
     hprintln!("Hello, world!");
 
+    let peripherals = stm32f103::Peripherals::take().unwrap();
+
+    // Enable clock for GPIOA by setting IOPAEN in RCC APB2ENR
+    peripherals.RCC.apb2enr.modify(|_, w| w.iopaen().set_bit());
+
+    peripherals.GPIOA.crl.modify(|_, w| w.mode3().output());
+    peripherals.GPIOA.crl.modify(|_, w| w.cnf3().push_pull());
+    peripherals.GPIOA.odr.modify(|_, w| w.odr3().high());
+
     loop {
         // your code goes here
         asm::nop();