fsfw/osal/FreeRTOS/BinSemaphUsingTask.cpp

#include <framework/osal/FreeRTOS/BinSemaphUsingTask.h>
#include <framework/osal/FreeRTOS/TaskManagement.h>

BinarySemaphoreUsingTask::BinarySemaphoreUsingTask() {
	handle = TaskManagement::getCurrentTaskHandle();
	xTaskNotifyGive(handle);
	locked = false;
}

ReturnValue_t BinarySemaphoreUsingTask::acquire(uint32_t timeoutMs) {
	TickType_t timeout = SemaphoreIF::NO_TIMEOUT;
	if(timeoutMs == SemaphoreIF::MAX_TIMEOUT) {
		timeout = SemaphoreIF::MAX_TIMEOUT;
	}
	else if(timeoutMs > SemaphoreIF::NO_TIMEOUT){
		timeout = pdMS_TO_TICKS(timeoutMs);
	}
	return acquireWithTickTimeout(timeout);
}

ReturnValue_t BinarySemaphoreUsingTask::acquireWithTickTimeout(
        TickType_t timeoutTicks) {
	BaseType_t returncode = ulTaskNotifyTake(pdTRUE, timeoutTicks);
	if (returncode == pdPASS) {
		locked = true;
		return HasReturnvaluesIF::RETURN_OK;
	}
	else {
		return SemaphoreIF::SEMAPHORE_TIMEOUT;
	}
}

ReturnValue_t BinarySemaphoreUsingTask::release() {
	if(not locked) {
		return SemaphoreIF::SEMAPHORE_NOT_OWNED;
	}
	BaseType_t returncode = xTaskNotifyGive(handle);
	if (returncode == pdPASS) {
		return HasReturnvaluesIF::RETURN_OK;
	} else {
		// This should never happen
		return HasReturnvaluesIF::RETURN_FAILED;
	}
}

TaskHandle_t BinarySemaphoreUsingTask::getTaskHandle() {
	return handle;
}

uint8_t BinarySemaphoreUsingTask::getSemaphoreCounter() const {
	uint32_t notificationValue;
	xTaskNotifyAndQuery(handle, 0, eNoAction, &notificationValue);
	return notificationValue;
}


uint8_t BinarySemaphoreUsingTask::getSemaphoreCounterFromISR(
		TaskHandle_t taskHandle) {
	uint32_t notificationValue;
	BaseType_t higherPriorityTaskWoken;
	xTaskNotifyAndQueryFromISR(taskHandle, 0, eNoAction, &notificationValue,
			&higherPriorityTaskWoken);
	if(higherPriorityTaskWoken) {
		TaskManagement::requestContextSwitch(CallContext::isr);
	}
	return notificationValue;
}

ReturnValue_t BinarySemaphoreUsingTask::release(
		TaskHandle_t taskHandle) {
	BaseType_t returncode = xTaskNotifyGive(taskHandle);
	if (returncode == pdPASS) {
		return HasReturnvaluesIF::RETURN_OK;
	}
	else {
		// This should never happen.
		return HasReturnvaluesIF::RETURN_FAILED;
	}
}

// Be careful with the stack size here. This is called from an ISR!
ReturnValue_t BinarySemaphoreUsingTask::releaseFromISR(
		TaskHandle_t taskHandle, BaseType_t * higherPriorityTaskWoken) {
	vTaskNotifyGiveFromISR(taskHandle, higherPriorityTaskWoken);
	if(*higherPriorityTaskWoken == pdPASS) {
		// Request context switch because unblocking the semaphore
		// caused a high priority task unblock.
		TaskManagement::requestContextSwitch(CallContext::isr);
	}
	return HasReturnvaluesIF::RETURN_OK;
}