122 lines
4.2 KiB
C++
122 lines
4.2 KiB
C++
#include <framework/serviceinterface/ServiceInterfaceStream.h>
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#include "FixedTimeslotTask.h"
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uint32_t FixedTimeslotTask::deadlineMissedCount = 0;
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const size_t PeriodicTaskIF::MINIMUM_STACK_SIZE = configMINIMAL_STACK_SIZE;
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FixedTimeslotTask::FixedTimeslotTask(const char *name, TaskPriority setPriority,
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TaskStackSize setStack, TaskPeriod overallPeriod,
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void (*setDeadlineMissedFunc)()) :
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started(false), handle(NULL), pst(overallPeriod * 1000) {
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xTaskCreate(taskEntryPoint, name, setStack, this, setPriority, &handle);
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// All additional attributes are applied to the object.
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this->deadlineMissedFunc = setDeadlineMissedFunc;
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}
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FixedTimeslotTask::~FixedTimeslotTask() {
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}
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void FixedTimeslotTask::taskEntryPoint(void* argument) {
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//The argument is re-interpreted as FixedTimeslotTask. The Task object is global, so it is found from any place.
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FixedTimeslotTask *originalTask(reinterpret_cast<FixedTimeslotTask*>(argument));
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// Task should not start until explicitly requested
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// in FreeRTOS, tasks start as soon as they are created if the scheduler is running
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// but not if the scheduler is not running.
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// to be able to accommodate both cases we check a member which is set in #startTask()
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// if it is not set and we get here, the scheduler was started before #startTask() was called and we need to suspend
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// if it is set, the scheduler was not running before #startTask() was called and we can continue
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if (!originalTask->started) {
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vTaskSuspend(NULL);
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}
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originalTask->taskFunctionality();
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sif::debug << "Polling task " << originalTask->handle
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<< " returned from taskFunctionality." << std::endl;
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}
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void FixedTimeslotTask::missedDeadlineCounter() {
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FixedTimeslotTask::deadlineMissedCount++;
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if (FixedTimeslotTask::deadlineMissedCount % 10 == 0) {
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sif::error << "PST missed " << FixedTimeslotTask::deadlineMissedCount
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<< " deadlines." << std::endl;
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}
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}
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ReturnValue_t FixedTimeslotTask::startTask() {
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started = true;
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// We must not call resume if scheduler is not started yet
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if (xTaskGetSchedulerState() != taskSCHEDULER_NOT_STARTED) {
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vTaskResume(handle);
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}
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return HasReturnvaluesIF::RETURN_OK;
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}
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ReturnValue_t FixedTimeslotTask::addSlot(object_id_t componentId,
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uint32_t slotTimeMs, int8_t executionStep) {
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if (objectManager->get<ExecutableObjectIF>(componentId) != NULL) {
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if(slotTimeMs == 0) {
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// TODO: FreeRTOS throws errors for zero values.
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// maybe there is a better solution than this.
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slotTimeMs = 1;
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}
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pst.addSlot(componentId, slotTimeMs, executionStep, this);
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return HasReturnvaluesIF::RETURN_OK;
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}
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error << "Component " << std::hex << componentId
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<< " not found, not adding it to pst" << std::endl;
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return HasReturnvaluesIF::RETURN_FAILED;
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}
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uint32_t FixedTimeslotTask::getPeriodMs() const {
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return pst.getLengthMs();
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}
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ReturnValue_t FixedTimeslotTask::checkSequence() const {
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return pst.checkSequence();
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}
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void FixedTimeslotTask::taskFunctionality() {
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// A local iterator for the Polling Sequence Table is created to find the start time for the first entry.
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SlotListIter slotListIter = pst.current;
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//The start time for the first entry is read.
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uint32_t intervalMs = slotListIter->pollingTimeMs;
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TickType_t interval = pdMS_TO_TICKS(intervalMs);
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TickType_t xLastWakeTime;
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/* The xLastWakeTime variable needs to be initialized with the current tick
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count. Note that this is the only time the variable is written to explicitly.
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After this assignment, xLastWakeTime is updated automatically internally within
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vTaskDelayUntil(). */
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xLastWakeTime = xTaskGetTickCount();
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// wait for first entry's start time
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vTaskDelayUntil(&xLastWakeTime, interval);
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/* Enter the loop that defines the task behavior. */
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for (;;) {
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//The component for this slot is executed and the next one is chosen.
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this->pst.executeAndAdvance();
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if (pst.slotFollowsImmediately()) {
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//Do nothing
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} else {
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// we need to wait before executing the current slot
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//this gives us the time to wait:
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intervalMs = this->pst.getIntervalToPreviousSlotMs();
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interval = pdMS_TO_TICKS(intervalMs);
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vTaskDelayUntil(&xLastWakeTime, interval);
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//TODO deadline missed check
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}
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}
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}
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ReturnValue_t FixedTimeslotTask::sleepFor(uint32_t ms) {
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vTaskDelay(pdMS_TO_TICKS(ms));
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return HasReturnvaluesIF::RETURN_OK;
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}
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