feat: add lab-rv32i-freertos-scheduler-states card

include/freertos/task_ref.hpp

@@ -0,0 +1,53 @@
+#ifndef FREERTOS_CPP_TASK_REF_HPP
+#define FREERTOS_CPP_TASK_REF_HPP
+
+extern "C"
+{
+#include "FreeRTOS.h"
+#include "task.h"
+}
+
+namespace freertos
+{
+
+/* Non-owning view: it never deletes the task and must not outlive the handle. */
+class TaskRef final
+{
+public:
+    explicit constexpr TaskRef( TaskHandle_t handle ) noexcept
+        : handle_ { handle }
+    {
+    }
+
+    static TaskRef current() noexcept
+    {
+        return TaskRef { xTaskGetCurrentTaskHandle() };
+    }
+
+    eTaskState state() const noexcept
+    {
+        return eTaskGetState( handle_ );
+    }
+
+    UBaseType_t priority() const noexcept
+    {
+        return uxTaskPriorityGet( handle_ );
+    }
+
+    void set_priority( UBaseType_t priority ) const noexcept
+    {
+        vTaskPrioritySet( handle_, priority );
+    }
+
+    constexpr TaskHandle_t native_handle() const noexcept
+    {
+        return handle_;
+    }
+
+private:
+    TaskHandle_t handle_;
+};
+
+} // namespace freertos
+
+#endif

include/freertos/ticks.hpp

@@ -0,0 +1,60 @@
+#ifndef FREERTOS_CPP_TICKS_HPP
+#define FREERTOS_CPP_TICKS_HPP
+
+extern "C"
+{
+#include "FreeRTOS.h"
+#include "task.h"
+}
+
+namespace freertos
+{
+
+class Ticks final
+{
+public:
+    explicit constexpr Ticks( TickType_t value ) noexcept : value_ { value }
+    {
+    }
+
+    constexpr TickType_t count() const noexcept
+    {
+        return value_;
+    }
+
+private:
+    TickType_t value_;
+};
+
+class TickPoint final
+{
+public:
+    explicit constexpr TickPoint( TickType_t value ) noexcept : value_ { value }
+    {
+    }
+
+    static TickPoint now() noexcept
+    {
+        return TickPoint { xTaskGetTickCount() };
+    }
+
+    constexpr TickType_t count() const noexcept
+    {
+        return value_;
+    }
+
+    friend constexpr Ticks operator-( TickPoint later,
+                                      TickPoint earlier ) noexcept
+    {
+        return Ticks { static_cast< TickType_t >( later.value_ -
+                                                  earlier.value_ ) };
+    }
+
+private:
+    TickType_t value_;
+};
+
+} // namespace freertos
+
+#endif
+