check for empty PST

and return appropriate returnvalue

src/fsfw/returnvalues/FwClassIds.h

@@ -72,10 +72,12 @@ enum: uint8_t {
     PUS_SERVICE_3, //PUS3
     PUS_SERVICE_9, //PUS9
     FILE_SYSTEM, //FILS
+    LINUX_OSAL, //UXOS
     HAL_SPI, //HSPI
     HAL_UART, //HURT
     HAL_I2C, //HI2C
     HAL_GPIO, //HGIO
+    FIXED_SLOT_TASK_IF, //FTIF
     FW_CLASS_ID_COUNT // [EXPORT] : [END]
 
 };

src/fsfw/tasks/FixedSlotSequence.cpp

@@ -1,4 +1,5 @@
 #include "fsfw/tasks/FixedSlotSequence.h"
+#include "fsfw/tasks/FixedTimeslotTaskIF.h"
 #include "fsfw/serviceinterface/ServiceInterface.h"
 #include <cstdlib>
 
@@ -92,10 +93,9 @@ void FixedSlotSequence::addSlot(object_id_t componentId, uint32_t slotTimeMs,
 ReturnValue_t FixedSlotSequence::checkSequence() const {
 	if(slotList.empty()) {
 #if FSFW_CPP_OSTREAM_ENABLED == 1
-		sif::error << "FixedSlotSequence::checkSequence:"
-				<< " Slot list is empty!" << std::endl;
+		sif::warning << "FixedSlotSequence::checkSequence: Slot list is empty!" << std::endl;
 #endif
-		return HasReturnvaluesIF::RETURN_FAILED;
+		return FixedTimeslotTaskIF::SLOT_LIST_EMPTY;
 	}
 
 	if(customCheckFunction != nullptr) {

src/fsfw/tasks/FixedSlotSequence.h

@@ -2,7 +2,7 @@
 #define FSFW_TASKS_FIXEDSLOTSEQUENCE_H_
 
 #include "FixedSequenceSlot.h"
-#include "../objectmanager/SystemObject.h"
+#include "fsfw/objectmanager/SystemObject.h"
 
 #include <set>
 
@@ -136,6 +136,7 @@ public:
 	 * @details
 	 * Checks if timing is ok (must be ascending) and if all handlers were found.
 	 * @return
+	 *  - SLOT_LIST_EMPTY if the slot list is empty
 	 */
 	ReturnValue_t checkSequence() const;
 
@@ -147,6 +148,7 @@ public:
 	 * The general check will be continued for now if the custom check function
 	 * fails but a diagnostic debug output will be given.
 	 * @param customCheckFunction
+	 *
 	 */
 	void addCustomCheck(ReturnValue_t (*customCheckFunction)(const SlotList &));
 

src/fsfw/tasks/FixedTimeslotTaskIF.h

@@ -2,7 +2,8 @@
 #define FRAMEWORK_TASKS_FIXEDTIMESLOTTASKIF_H_
 
 #include "PeriodicTaskIF.h"
-#include "../objectmanager/ObjectManagerIF.h"
+#include "fsfw/objectmanager/ObjectManagerIF.h"
+#include "fsfw/returnvalues/FwClassIds.h"
 
 /**
  * @brief Following the same principle as the base class IF.
@@ -12,6 +13,8 @@ class FixedTimeslotTaskIF : public PeriodicTaskIF {
 public:
 	virtual ~FixedTimeslotTaskIF() {}
 
+	static constexpr ReturnValue_t SLOT_LIST_EMPTY = HasReturnvaluesIF::makeReturnCode(
+	        CLASS_ID::FIXED_SLOT_TASK_IF, 0);
 	/**
 	 * Add an object with a slot time and the execution step to the task.
 	 * The execution step will be passed to the object (e.g. as an operation

src/fsfw/tasks/Typedef.h

@@ -1,5 +1,8 @@
-#ifndef FRAMEWORK_TASKS_TYPEDEF_H_
-#define FRAMEWORK_TASKS_TYPEDEF_H_
+#ifndef FSFW_TASKS_TYPEDEF_H_
+#define FSFW_TASKS_TYPEDEF_H_
+
+#include <cstdint>
+#include <cstddef>
 
 typedef const char* TaskName;
 typedef uint32_t TaskPriority;
@@ -7,4 +10,4 @@ typedef size_t TaskStackSize;
 typedef double TaskPeriod;
 typedef void (*TaskDeadlineMissedFunction)();
 
-#endif /* FRAMEWORK_TASKS_TYPEDEF_H_ */
+#endif /* FSFW_TASKS_TYPEDEF_H_ */