Created write/read while using registry directly

compile.sh

@@ -6,4 +6,5 @@
 #cargo build --target thumbv7em-none-eabihf --example bare2
 #cargo build --target thumbv7em-none-eabihf --release --example bare2
 #cargo build --target thumbv7em-none-eabihf --example bare3
-cargo build --target thumbv7em-none-eabihf --example bare4
+#cargo build --target thumbv7em-none-eabihf --example bare4
+cargo build --target thumbv7em-none-eabihf --example bare5

examples/bare5.rs

@@ -7,6 +7,8 @@
 
 extern crate cortex_m;
 extern crate cortex_m_rt;
+extern crate cortex_m_debug;
+
 
 // C like API...
 mod stm32f40x {
@@ -126,6 +128,27 @@ fn main() {
     idle(rcc, gpioa);
 }
 
+
+
+////////////////////// Fun API starts here
+
+pub const G_BASE: u32 = 0x40000000 + 0x00020000;
+pub const GPIOA_MODER: u32 = G_BASE;
+pub const GPIOA_BSRR: u32 = G_BASE + 0x18;
+
+fn w_rite(addr: u32, val: u32) { 
+    unsafe { 
+        core::ptr::write_volatile(addr as *mut _, val);
+    }
+}
+
+fn r_ead(addr: u32) -> u32 {
+    unsafe {
+        core::ptr::read_volatile(addr as *const _)
+    }
+}
+
+
 // user application
 fn idle(rcc: &mut RCC, gpioa: &mut GPIOA) {
     let rcc_copy = &rcc;
@@ -141,13 +164,24 @@ fn idle(rcc: &mut RCC, gpioa: &mut GPIOA) {
     // this is more efficient as the read register is not needed.
 
     loop {
-        // set PA5 high
-        gpioa.BSRRH.write(1 << 5); // set bit, output hight (turn on led)
+
+
+        w_rite(GPIOA_BSRR, 1 << 5);
         wait(10_000);
+        // sprintln!("BOYE");
+        // ipln!("Boye!");
         
-        // set PA5 low
-        gpioa.BSRRL.write(1 << 5); // clear bit, output low (turn off led)
+        w_rite(GPIOA_BSRR, 1 << (5 + 16));
         wait(10_000);
+
+
+  //      // set PA5 high
+  //      gpioa.BSRRH.write(1 << 5); // set bit, output hight (turn on led)
+  //      wait(10_000);
+
+  //      // set PA5 low
+  //      gpioa.BSRRL.write(1 << 5); // clear bit, output low (turn off led)
+  //      wait(10_000);
     }
 }
 

gdb.sh

@@ -7,4 +7,5 @@ TARGET=thumbv7em-none-eabihf
 #arm-none-eabi-gdb target/$TARGET/debug/examples/bare2
 #arm-none-eabi-gdb target/$TARGET/release/examples/bare2
 #arm-none-eabi-gdb target/$TARGET/debug/examples/bare3
-arm-none-eabi-gdb target/$TARGET/debug/examples/bare4
+#arm-none-eabi-gdb target/$TARGET/debug/examples/bare4
+arm-none-eabi-gdb target/$TARGET/debug/examples/bare5