boards/kakute-f7-mini-v3: simple led demo for board testing

Signed-off-by: Onur Özkan <work@onurozkan.dev>

Cargo.lock

@@ -104,6 +104,7 @@ name = "kaptan-kakute-f7-mini-v3"
 version = "0.1.0"
 dependencies = [
  "cortex-m",
+ "cortex-m-rt",
  "kaptan-spec",
  "panic-halt",
  "rtic",

boards/kakute-f7-mini-v3/Cargo.toml

@@ -11,9 +11,10 @@ firmware = []
 
 [dependencies]
 cortex-m = "0.7"
+cortex-m-rt = "0.7"
 panic-halt = "1"
 rtic = { version = "2.3", default-features = false, features = ["thumbv7-backend"] }
-stm32f7 = { version = "0.16", default-features = false, features = ["rt", "stm32f745"] }
+stm32f7 = { version = "0.16", default-features = false, features = ["rt", "stm32f722"] }
 
 [build-dependencies]
 kaptan-spec = { path = "../../libs/kaptan-spec", features = ["std"] }

boards/kakute-f7-mini-v3/build.rs

@@ -1,3 +1,10 @@
 fn main() {
     kaptan_spec::validate_package();
+    println!("cargo:rerun-if-changed=build.rs");
+    println!("cargo:rerun-if-changed=memory.x");
+    println!("cargo:rustc-link-arg=-Tlink.x");
+    println!(
+        "cargo:rustc-link-search={}",
+        std::env::var("CARGO_MANIFEST_DIR").expect("Cargo must set CARGO_MANIFEST_DIR")
+    );
 }

boards/kakute-f7-mini-v3/memory.x

@@ -0,0 +1,5 @@
+MEMORY
+{
+  FLASH : ORIGIN = 0x08000000, LENGTH = 512K
+  RAM : ORIGIN = 0x20000000, LENGTH = 256K
+}

boards/kakute-f7-mini-v3/src/main.rs

@@ -1,9 +1,10 @@
 #![no_std]
 #![no_main]
 
+use cortex_m_rt as _;
 use panic_halt as _;
 
-#[rtic::app(device = stm32f7::stm32f745, peripherals = true)]
+#[rtic::app(device = stm32f7::stm32f722, peripherals = true)]
 mod app {
     #[shared]
     struct Shared {
@@ -13,11 +14,30 @@ mod app {
     #[local]
     struct Local {
         // TODO
+        led: stm32f7::stm32f722::GPIOD,
+        led_output_high: bool,
     }
 
     #[init]
-    fn init(_context: init::Context) -> (Shared, Local) {
-        (Shared {}, Local {})
+    fn init(context: init::Context) -> (Shared, Local) {
+        let device = context.device;
+
+        device
+            .RCC
+            .ahb1enr()
+            .modify(|_, write| write.gpioden().set_bit());
+        device
+            .GPIOD
+            .moder()
+            .modify(|_, write| write.moder2().output());
+
+        (
+            Shared {},
+            Local {
+                led: device.GPIOD,
+                led_output_high: false,
+            },
+        )
     }
 
     #[task(binds = EXTI4, priority = 15)]
@@ -25,12 +45,25 @@ mod app {
         // TODO
     }
 
-    #[idle]
-    fn idle(_context: idle::Context) -> ! {
-        // TODO
-
+    #[idle(local = [led, led_output_high])]
+    fn idle(context: idle::Context) -> ! {
         loop {
-            cortex_m::asm::wfi();
+            if *context.local.led_output_high {
+                context
+                    .local
+                    .led
+                    .bsrr()
+                    .write(|write| write.br2().set_bit());
+            } else {
+                context
+                    .local
+                    .led
+                    .bsrr()
+                    .write(|write| write.bs2().set_bit());
+            }
+
+            *context.local.led_output_high = !*context.local.led_output_high;
+            cortex_m::asm::delay(8_000_000);
         }
     }
 }