osal/FreeRTOS/BinarySemaphore.cpp

@@ -0,0 +1,154 @@
+/**
+ * @file BinarySemaphore.cpp
+ *
+ * @date 25.02.2020
+ */
+#include <framework/osal/FreeRTOS/BinarySemaphore.h>
+#include <framework/osal/FreeRTOS/TaskManagement.h>
+
+#include <framework/serviceinterface/ServiceInterfaceStream.h>
+
+BinarySemaphore::BinarySemaphore() {
+	handle = xSemaphoreCreateBinary();
+	if(handle == nullptr) {
+
+		error << "Binary semaphore creation failure" << std::endl;
+	}
+	xSemaphoreGive(handle);
+}
+
+BinarySemaphore::~BinarySemaphore() {
+	vSemaphoreDelete(handle);
+}
+
+// This copy ctor is important as it prevents the assignment to a ressource
+// (other.handle) variable which is later deleted!
+BinarySemaphore::BinarySemaphore(const BinarySemaphore& other) {
+    handle = xSemaphoreCreateBinary();
+    if(handle == nullptr) {
+        error << "Binary semaphore creation failure" << std::endl;
+    }
+    xSemaphoreGive(handle);
+}
+
+BinarySemaphore& BinarySemaphore::operator =(const BinarySemaphore& s) {
+    if(this != &s) {
+        handle = xSemaphoreCreateBinary();
+        if(handle == nullptr) {
+            error << "Binary semaphore creation failure" << std::endl;
+        }
+        xSemaphoreGive(handle);
+    }
+    return *this;
+}
+
+BinarySemaphore::BinarySemaphore(BinarySemaphore&& s) {
+    handle = xSemaphoreCreateBinary();
+    if(handle == nullptr) {
+        error << "Binary semaphore creation failure" << std::endl;
+    }
+    xSemaphoreGive(handle);
+}
+
+BinarySemaphore& BinarySemaphore::operator =(
+        BinarySemaphore&& s) {
+    if(&s != this) {
+        handle = xSemaphoreCreateBinary();
+        if(handle == nullptr) {
+            error << "Binary semaphore creation failure" << std::endl;
+        }
+        xSemaphoreGive(handle);
+    }
+    return *this;
+}
+
+ReturnValue_t BinarySemaphore::takeBinarySemaphore(uint32_t timeoutMs) {
+	if(handle == nullptr) {
+		return SEMAPHORE_NULLPOINTER;
+	}
+	TickType_t timeout = BinarySemaphore::NO_BLOCK_TICKS;
+	if(timeoutMs == BinarySemaphore::BLOCK_TIMEOUT) {
+	    timeout = BinarySemaphore::BLOCK_TIMEOUT_TICKS;
+	}
+	else if(timeoutMs > BinarySemaphore::NO_BLOCK_TIMEOUT){
+	    timeout = pdMS_TO_TICKS(timeoutMs);
+	}
+
+	BaseType_t returncode = xSemaphoreTake(handle, timeout);
+	if (returncode == pdPASS) {
+		return HasReturnvaluesIF::RETURN_OK;
+	}
+	else {
+	    return SEMAPHORE_TIMEOUT;
+	}
+}
+
+ReturnValue_t BinarySemaphore::takeBinarySemaphoreTickTimeout(
+        TickType_t timeoutTicks) {
+	if(handle == nullptr) {
+		return SEMAPHORE_NULLPOINTER;
+	}
+
+	BaseType_t returncode = xSemaphoreTake(handle, timeoutTicks);
+	if (returncode == pdPASS) {
+		return HasReturnvaluesIF::RETURN_OK;
+	} else {
+		return SEMAPHORE_TIMEOUT;
+	}
+}
+
+ReturnValue_t BinarySemaphore::giveBinarySemaphore() {
+	if (handle == nullptr) {
+		return SEMAPHORE_NULLPOINTER;
+	}
+	BaseType_t returncode = xSemaphoreGive(handle);
+	if (returncode == pdPASS) {
+		return HasReturnvaluesIF::RETURN_OK;
+	} else {
+		return SEMAPHORE_NOT_OWNED;
+	}
+}
+
+SemaphoreHandle_t BinarySemaphore::getSemaphore() {
+	return handle;
+}
+
+ReturnValue_t BinarySemaphore::giveBinarySemaphore(SemaphoreHandle_t semaphore) {
+	if (semaphore == nullptr) {
+		return SEMAPHORE_NULLPOINTER;
+	}
+	BaseType_t returncode = xSemaphoreGive(semaphore);
+	if (returncode == pdPASS) {
+		return HasReturnvaluesIF::RETURN_OK;
+	} else {
+		return HasReturnvaluesIF::RETURN_FAILED;
+	}
+}
+
+void BinarySemaphore::resetSemaphore() {
+	if(handle != nullptr) {
+		vSemaphoreDelete(handle);
+		handle = xSemaphoreCreateBinary();
+		xSemaphoreGive(handle);
+	}
+}
+
+
+// Be careful with the stack size here. This is called from an ISR!
+ReturnValue_t BinarySemaphore::giveBinarySemaphoreFromISR(SemaphoreHandle_t semaphore,
+		BaseType_t * higherPriorityTaskWoken) {
+	if (semaphore == nullptr) {
+		return SEMAPHORE_NULLPOINTER;
+	}
+	BaseType_t returncode = xSemaphoreGiveFromISR(semaphore, higherPriorityTaskWoken);
+	if (returncode == pdPASS) {
+		if(*higherPriorityTaskWoken == pdPASS) {
+			// Request context switch because unblocking the semaphore
+		    // caused a high priority task unblock.
+			TaskManagement::requestContextSwitch(CallContext::isr);
+		}
+		return HasReturnvaluesIF::RETURN_OK;
+	} else {
+		return SEMAPHORE_NOT_OWNED;
+	}
+}

osal/FreeRTOS/BinarySemaphore.h

@@ -0,0 +1,134 @@
+/**
+ * @file BinarySempahore.h
+ *
+ * @date 25.02.2020
+ */
+#ifndef FRAMEWORK_OSAL_FREERTOS_BINARYSEMPAHORE_H_
+#define FRAMEWORK_OSAL_FREERTOS_BINARYSEMPAHORE_H_
+
+#include <framework/returnvalues/HasReturnvaluesIF.h>
+
+extern "C" {
+#include "FreeRTOS.h"
+#include "semphr.h"
+}
+
+
+/**
+ * @brief OS Tool to achieve synchronization of between tasks or between task and ISR
+ * @details
+ * Documentation: https://www.freertos.org/Embedded-RTOS-Binary-Semaphores.html
+ *
+ * SHOULDDO: check freeRTOS version and use new task notifications,
+ * if non-ancient freeRTOS version is used.
+ *
+ * @ingroup osal
+ */
+class BinarySemaphore: public HasReturnvaluesIF {
+public:
+	static const uint8_t INTERFACE_ID = CLASS_ID::SEMAPHORE_IF;
+
+	//! No block time, poll the semaphore. Can also be used as tick type.
+	//! Can be passed as tick type and ms value.
+	static constexpr uint32_t NO_BLOCK_TIMEOUT = 0;
+	static constexpr TickType_t NO_BLOCK_TICKS = 0;
+	//! No block time, poll the semaphore.
+	//! Can be passed as tick type and ms value.
+	static constexpr TickType_t BLOCK_TIMEOUT_TICKS = portMAX_DELAY;
+	static constexpr uint32_t BLOCK_TIMEOUT = portMAX_DELAY;
+
+	//! Semaphore timeout
+	static constexpr ReturnValue_t SEMAPHORE_TIMEOUT = MAKE_RETURN_CODE(1);
+	/** The current semaphore can not be given, because it is not owned */
+	static constexpr ReturnValue_t SEMAPHORE_NOT_OWNED = MAKE_RETURN_CODE(2);
+	static constexpr ReturnValue_t SEMAPHORE_NULLPOINTER = MAKE_RETURN_CODE(3);
+
+	BinarySemaphore();
+
+	/**
+	 * @brief Copy ctor
+	 */
+	BinarySemaphore(const BinarySemaphore&);
+
+	/**
+	 * @brief Copy assignment
+	 */
+	BinarySemaphore& operator=(const BinarySemaphore&);
+
+	/**
+	 * @brief Move constructor
+	 */
+	BinarySemaphore (BinarySemaphore &&);
+
+	/**
+	 * Move assignment
+	 */
+	BinarySemaphore & operator=(BinarySemaphore &&);
+
+	/**
+	 * Delete the binary semaphore to prevent a memory leak
+	 */
+	virtual ~BinarySemaphore();
+
+	/**
+	 * Take the binary semaphore.
+	 * If the semaphore has already been taken, the task will be blocked
+	 * for a maximum of #timeoutMs or until the semaphore is given back,
+	 * for example by an ISR or another task.
+	 * @param timeoutMs
+	 * @return -@c RETURN_OK on success
+	 *         -@c RETURN_FAILED on failure
+	 */
+	ReturnValue_t takeBinarySemaphore(uint32_t timeoutMs =
+	        BinarySemaphore::NO_BLOCK_TIMEOUT);
+
+	/**
+	 * Same as lockBinarySemaphore() with timeout in FreeRTOS ticks.
+	 * @param timeoutTicks
+	 * @return - @c RETURN_OK on success
+	 *         - @c RETURN_FAILED on failure
+	 */
+	ReturnValue_t takeBinarySemaphoreTickTimeout(TickType_t timeoutTicks =
+	        BinarySemaphore::NO_BLOCK_TICKS);
+
+	/**
+	 * Give back the binary semaphore
+	 * @return - @c RETURN_OK on success
+	 *         - @c RETURN_FAILED on failure
+	 */
+	ReturnValue_t giveBinarySemaphore();
+
+	/**
+	 * Get Handle to the semaphore.
+	 * @return
+	 */
+	SemaphoreHandle_t getSemaphore();
+
+	/**
+	 * Reset the semaphore.
+	 */
+	void resetSemaphore();
+
+	 /**
+	 * Wrapper function to give back semaphore from handle
+	 * @param semaphore
+	 * @return - @c RETURN_OK on success
+	 *         - @c RETURN_FAILED on failure
+	 */
+	static ReturnValue_t giveBinarySemaphore(SemaphoreHandle_t semaphore);
+
+	/**
+	 * Wrapper function to give back semaphore from handle when called from an ISR
+	 * @param semaphore
+	 * @param higherPriorityTaskWoken This will be set to pdPASS if a task with a higher priority
+	 *        was unblocked
+	 * @return - @c RETURN_OK on success
+	 *         - @c RETURN_FAILED on failure
+	 */
+	static ReturnValue_t giveBinarySemaphoreFromISR(SemaphoreHandle_t semaphore,
+				BaseType_t * higherPriorityTaskWoken);
+private:
+	SemaphoreHandle_t handle;
+};
+
+#endif /* FRAMEWORK_OSAL_FREERTOS_BINARYSEMPAHORE_H_ */

osal/FreeRTOS/TaskManagement.cpp

@@ -1,10 +1,11 @@
 #include <framework/osal/FreeRTOS/TaskManagement.h>
-
+
 void TaskManagement::requestContextSwitchFromTask() {
 	vTaskDelay(0);
 }
 
-void TaskManagement::requestContextSwitch(CallContext callContext = CallContext::task) {
+void TaskManagement::requestContextSwitch(
+		CallContext callContext = CallContext::task) {
 	if(callContext == CallContext::isr) {
 		// This function depends on the partmacro.h definition for the specific device
 		requestContextSwitchFromISR();
@@ -12,7 +13,7 @@ void TaskManagement::requestContextSwitch(CallContext callContext = CallContext:
 		requestContextSwitchFromTask();
 	}
 }
-
+
 TaskHandle_t TaskManagement::getCurrentTaskHandle() {
 	return xTaskGetCurrentTaskHandle();
 }
@@ -20,5 +21,3 @@ TaskHandle_t TaskManagement::getCurrentTaskHandle() {
 configSTACK_DEPTH_TYPE TaskManagement::getTaskStackHighWatermark() {
 	return uxTaskGetStackHighWaterMark(TaskManagement::getCurrentTaskHandle());
 }
-
-

osal/FreeRTOS/TaskManagement.h

@@ -8,7 +8,7 @@ extern "C" {
 #include <freertos/task.h>
 }
 #include <cstdint>
-
+
 /**
  * Architecture dependant portmacro.h function call.
  * Should be implemented in bsp.
@@ -18,7 +18,8 @@ extern "C" void requestContextSwitchFromISR();
 /*!
  * Used by functions to tell if they are being called from
  * within an ISR or from a regular task. This is required because FreeRTOS
- * has different functions for handling semaphores and messages from within an ISR and task.
+ * has different functions for handling semaphores and messages from within
+ * an ISR and task.
  */
 
 enum CallContext {
@@ -30,10 +31,10 @@ enum CallContext {
 class TaskManagement {
 public:
 	/**
-	 * In this function, a function dependant on the portmacro.h header function calls
+	 * @brief	In this function, a function dependant on the portmacro.h header
-	 * to request a context switch can be specified.
+	 * 			function calls to request a context switch can be specified.
-	 * This can be used if sending to the queue from an ISR caused a task to unblock
+	 * This can be used if sending to the queue from an ISR caused a task
-	 * and a context switch is required.
+	 * to unblock and a context switch is required.
 	 */
 	static void requestContextSwitch(CallContext callContext);
 
@@ -41,7 +42,7 @@ public:
 	 * If task preemption in FreeRTOS is disabled, a context switch
 	 * can be requested manually by calling this function.
 	 */
-	static void requestContextSwitchFromTask(void);
+	static void requestContextSwitchFromTask(void);
 
 	/**
 	 * @return The current task handle
@@ -57,7 +58,7 @@ public:
 	 * @return Smallest value of stack remaining since the task was started in
 	 * 		   words.
 	 */
-	static configSTACK_DEPTH_TYPE getTaskStackHighWatermark();
+	static configSTACK_DEPTH_TYPE getTaskStackHighWatermark();
 };
 
 #endif /* FRAMEWORK_OSAL_FREERTOS_TASKMANAGEMENT_H_ */