Technical Function

Blinking LED

An LED shall blink to indicate that the system is alive and responding.





NameBlinking LED
Type TechnicalFunction

An LED shall blink to indicate that the system is alive and responding.


Software units (4)

Sofware units this technical function is associated with. See associated tasks for more software dependencies.

Unit Parent Function calls Technical Functions Requirements Type Tasks WCET Stack ROM Globals ProtectionSets SIL req SIL ach sub Technical Functions (R) sub Requirements (R) Has a return value (R) SystemStates (R) Ingoing Trigger Ports (R) Outgoing Trigger Ports (R) Ingoing Data Ports (R) Outgoing Data Ports (R) Signals (D) Runnables (D) DataType (D) Is Synchronous (D) Hardware (D) Ports (G) Callers (F) Return Type (F) Parameters (F)

Reads the current button state from hardware

InDriver 0 0 0
QM QM - - - - - - - - uRTE_boolean_t true - - - -

Hardware write-Interface towards the LED

OutDriver 0 0 0
QM QM - - - - - - - - uRTE_boolean_t true - - - -

Controls the LED signal and thus the LED

Runnable 0 0 0
- QM false
  • Runnable_00_blink_Tick
  • Runnable_blink_Button_IN
  • Runnable_00_blink_OUT
- - - - - - - - -

Acquires the button state periodically and provides button signals

Runnable 0 0 0
QM QM false
  • Runnable_run_readButton_Tick
  • Runnable_run_readButton_Edge_OUT
  • run_readButton_HW_IN
  • Runnable_run_readButton_Button_OUT
  • Runnable_run_readButton_button_pressed_cnt
- - - - - - - - -

Hardware Components (1)

Hardware Components this technical function is associated with. See associated tasks for more hardware dependencies.

Component Type Start End SIL req SIL ach Sub-Components Technical Functions sub Technical Functions Requirements sub Requirements

LD2 [Green Led] on the Nucelo Board


Functional Layer

Logical Function Blocks (3)

Logical Function Blocks which which are associated with this Technical Function.

Function Type Technical functions

An binary HMI


The MCU implementing the logic


An LED to indicate a binary state


Requirement Layer

Hazard Scenarios (1)

Hazard Scenarios for associated Hazardous Events.

Hazard Scenario Parent Hazard Events

This would be very sad.

Hazardous Events (2)

Hazardous Events for associated Safety Goals.

Hazardous Event Parent Probability Controllability Effect SIL Safety-Goals

The user might think µRTE is hard to use.


The customer might not see the full spectrum of features µRTE comes with.


Safetygoals (1)

Safety Goals linking to the Requirements.

Safety Goal Parent Function Type SIL derived SIL manual SIL effective Safe State Safety Requirements

An small demo model with the most important features shall show the most important features of µRTE.

System_Function QM derived QM Show slides

(Safety)Requirements (3)

(Safety)Requirements referencing to this technical function.

(Safety)Requirement Parent User-ID Author Creation Date Start Date Deadline Expense Responsibe Category Type Status Function Type SIL derived SIL manual SIL effective Tests Technical Functions Software Hardware Signals Global variables Activation events Use-Cases User-Stories Refining Conflicting refined by conflicted by

In order to indicate that uRTE is up and running, an LED shall blink (toggle its binary state) with an frequency of 1/100ms.

Requirement_32 Thomas Barth Tue Jun 07 13:05:57 CEST 2022 0.0 Thomas Barth product functional implemented - - - -

While the button is pressed, the LED shall be on permanently.

Requirement_93 Wed Jun 08 17:18:27 CEST 2022 0.0 product functional implemented - - - -

Runnables can be activated by cyclic events.

SafetyRequirement_95 Thomas Barth Wed Jun 08 17:34:15 CEST 2022 0.0 Thomas Barth product functional implemented System_Function QM SIL_1 SIL_1

Software Layer

Tasks (2)

Tasks in which software units are executed.

Task Core SIL Priority Software States Signals Init Hardware OutputSections Own TimeBase Stack

Task responsible for reading the button state

Arm® Cortex®-M4 SIL_1 6 - false .rtos.task.Button

Task responsible to let the LED blink

Arm® Cortex®-M4 SIL_1 4 - false .rtos.task.LED

Testing Layer

Tests (2)

Tests derived from referencing requirements.

Test User-ID Group Priority Status Procedure and Input-Data Expected Results SIL Requirements Technical-Functions Software-Units Signals Global variables Activation-Events Hardware-Components

The LED has to blink with a frequency of 1/100ms.

Test_132 0 implemented Regular power-on without user-input A blinking LED

Check if the LED is permanent on if there is user-input from the button

Test_133 0 implemented After a regular power-on, the button is pressed The LED shall be permanently on while the button is pressed