Fixed hardfault due to broken memory layout

firmware/src/bootloader.rs

@@ -1,4 +1,4 @@
-use core::ptr::addr_of_mut;
+use core::{mem::MaybeUninit, ptr::addr_of_mut};
 
 use stm32f4xx_hal::pac;
 
@@ -23,33 +23,28 @@ fn jump_to_bootloader() {
 
 const BOOTLOADER_REQUESTED: u32 = 0xdecafbad;
 
-fn magic_mut_ptr() -> *mut u32 {
-    extern "C" {
-        #[link_name = "_dfu_magic"]
-        static mut magic: u32;
-    }
-
-    unsafe { addr_of_mut!(magic) }
-}
+#[link_section = ".uninit.DFU_FLAG"]
+static mut DFU_FLAG: MaybeUninit<u32> = MaybeUninit::uninit();
 
 fn get_bootloader_flag() -> u32 {
-    unsafe { magic_mut_ptr().read_volatile() }
+    unsafe { DFU_FLAG.assume_init() }
 }
 
 fn set_bootloader_flag() {
-    unsafe { magic_mut_ptr().write_volatile(BOOTLOADER_REQUESTED) };
+    unsafe { DFU_FLAG.write(BOOTLOADER_REQUESTED) };
 }
 
 fn clear_bootloader_flag() {
-    unsafe { magic_mut_ptr().write_volatile(BOOTLOADER_REQUESTED) };
+    unsafe { DFU_FLAG.write(0) };
 }
 
 pub fn init() {
     let requested = get_bootloader_flag() == BOOTLOADER_REQUESTED;
     if requested {
-        clear_bootloader_flag();
         jump_to_bootloader();
     }
+
+    clear_bootloader_flag();
 }
 
 pub fn reboot_to_bootloader() -> ! {

firmware/src/main.rs

@@ -71,7 +71,7 @@ mod app {
         spi_cs3: gpiob::PB15<Output<PushPull>>,
         spi1: spi::Spi<SPI1>,
 
-        az_enable: gpioa::PA10<Output<PushPull>>,
+        az_enable: gpiob::PB8<Output<PushPull>>,
         az_dir: gpioa::PA15<Output<PushPull>>,
         az_step: gpiob::PB3<Output<PushPull>>,
 
@@ -208,7 +208,7 @@ mod app {
 
         defmt::info!("SPI Setup done");
 
-        let mut az_enable = gpioa.pa10.into_push_pull_output();
+        let mut az_enable = gpiob.pb8.into_push_pull_output();
         az_enable.set_high();
         let az_dir = gpioa.pa15.into_push_pull_output();
         let az_step = gpiob.pb3.into_push_pull_output();
@@ -351,7 +351,7 @@ mod app {
 
             defmt::info!("angle: {:?}", angle_deg);
 
-            Mono::delay(50.millis()).await;
+            Mono::delay(1.millis()).await;
         }
     }
 
@@ -361,30 +361,51 @@ mod app {
         let az_dir = cx.local.az_dir;
         let az_step = cx.local.az_step;
 
+        let mut counter = 0;
+        let mut az_target = 0;
+
         loop {
-            let az_target = cx.shared.az_compass.lock(|az_compass| *az_compass);
+            //let az_target = 1800; //cx.shared.az_compass.lock(|az_compass| *az_compass);
 
             let az_angle = cx.shared.az_angle.lock(|az_angle| *az_angle);
             let diff = az_angle - az_target;
 
-            defmt::info!("angle diff: {:?}", diff);
+            defmt::info!(
+                "angle diff/target/actual: {:?}/{:?}/{:?}",
+                diff,
+                az_target,
+                az_angle
+            );
+
+            let delay = if diff.abs() < 10 {
+                10.millis()
+            } else if diff < 100 {
+                5.millis()
+            } else {
+                1.millis()
+            };
 
             if diff.abs() > 5 {
                 az_enable.set_low();
-                if diff > 0 {
+                if diff < 0 {
                     az_dir.set_high();
                 } else {
                     az_dir.set_low();
                 }
 
                 az_step.set_low();
-                Mono::delay(250.micros()).await;
+                Mono::delay(delay / 2).await;
                 az_step.set_high();
-                Mono::delay(250.micros()).await;
+                Mono::delay(delay / 2).await;
             } else {
                 az_enable.set_high();
-                Mono::delay(500.micros()).await;
+                Mono::delay(delay).await;
             }
+
+            counter = (counter + 1) % 1000;
+            if counter == 0 {
+                az_target = (az_target + 450) % 3600;
+            };
         }
     }
 

memory.x

@@ -1,23 +1,9 @@
 MEMORY
 {
   FLASH : ORIGIN = 0x08000000, LENGTH = 256K 
-  UNINIT: ORIGIN = 0x20000000, LENGTH = 0x10
-  RAM : ORIGIN = 0x20000010, LENGTH = 64K - LENGTH(UNINIT)
+  RAM : ORIGIN = 0x20000000, LENGTH = 64K
 }
 
-SECTIONS {
-  .uninit_flags (NOLOAD) : ALIGN(4)
-  {
-    . = ALIGN(4);
-    __suninit_flags = .;
-    _dfu_magic = .; . += 4;
-    *(.uninit_flags .uninit_flags.*)
-    . = ALIGN(4);
-    __euninit_flags = .;
-  } > UNINIT
-}
-
-
 /* This is where the call stack will be allocated. */
 /* The stack is of the full descending type. */
 /* NOTE Do NOT modify `_stack_start` unless you know what you are doing */