uRTEDemo_03_Nucleo-F446RE_SystemStates_10_Model

Logical Function Model

The logical function model contains an abstract functional description of the system.
It can be used as interface between the implementation layers (hard-and software) and the requirements layer.

Diagrams

Properties

Content

Technical Functions (2)

Function LFB Software Hardware Technical Functions sub Technical Functions Requirements sub Requirements

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

If the button is pressed, UART messages indicating the press duration are sent.

Logical Function Blocks (4)

Function Type Technical functions

An binary HMI

Input

The MCU implementing the logic

Service

An LED to indicate a binary state

Output

A PC receiving UART messages

Monitor

Requirement Layer

(Safety)Requirements (6)

(Safety)Requirements referencing to technical functions in this model.

(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 - - - -

When the button is pressed, the system-state shall change from Blink into UART mode.
The start of UART mode shall be signaled via UART.
As long as the button is pressed, UART strings with the time in seconds the Button was pressed shall be send with the frequency with which the button pressed signal is updated.

Requirement_95 Thomas Barth Wed Jun 08 17:56:19 CEST 2022 0.0 Thomas Barth product functional implemented - - - -

Runnables can be activated by signal (onData/onError) events.

SafetyRequirement_93 Thomas Barth Wed Jun 08 17:34:15 CEST 2022 0.0 Thomas Barth product functional implemented System_Function QM derived QM

Global variables can store data for Runnables and other Software Functions.
The memory protection will automatically be generated.
The actual declaration is implemented as user-code to allow the use of non-trivial datatypes and operations.

SafetyRequirement_94 Thomas Barth Wed Jun 08 17:34:15 CEST 2022 0.0 Thomas Barth product functional implemented System_Function QM derived QM

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

Software units (7)

Sofware units to which techical functions in this model reference.

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

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

writes Data to the UART module.
No DataType is chosen, so that a typedef file will be generated.

UART
OutDriver 0 0 0
- QM - - - - - - - - None true - - - -

Hardware write-Interface towards the LED

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

Controls the LED signal and thus the LED

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

Sends UART messages periodically via the UART signal

UART
Runnable 0 0 0
QM QM
true
  • Runnable_run_UART_send_TPortIN_1
  • Runnable_run_UART_send_DPortIN_1
  • Runnable_run_UART_send_DPortIN_2
  • Runnable_run_UART_send_UART_OUT
- - - - - - - - -

Runnable to switch into the UART state if there is an event in the Blink State.
This runnable does not use hardware signals but accesses hardware directly and is therefore associated with
an protection set grandting access to hardware.

UART
Runnable 0 0 0
QM QM
true
  • Runnable_run_UART_WakeUP
- - - - - - - - -

Acquires the button state periodically and provides button signals

Button
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 Layer

Hardware Components (2)

Hardware Components to which techical functions in this model reference.

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

Periphery GPIOA_BASE GPIOB_BASE - 1 - QM

UART module connected to pin TX/RX PA2/PA3 at 115200 8N1

Periphery USART2_BASE USART3_BASE - 1 - QM