3 Embedded Software

8/10/2019 3 Embedded Software

1/23


2/23


3/23

is the collection of computer programs and relateddata that provide the instructions telling a computerwhat to do.

It also refers to one or more computer programs and

data held in the storage of the computer for somepurposes.

Software products may be developed for a particularcustomer or may be developed for a general market.

3


4/23

The costs of software are often higher than the hardwarecost.

Software costs more to be maintained than it does to bedeveloped. For systems with long life, maintenance cost

may be several times development cost.

4


5/23

Software with a principal role of interacting with the

physical world must, of necessity, acquire some properties

of the physical world.

It takes time, consumes power. It does not terminate

(unless it fails).

5


6/23

The software should deliver the required functionality andperformance to user and should be maintainable,

reliable and usable.

Maintainability

Software must evolve to meet changing needs.

ReliabilitySoftware must be trustworthy.

6


7/23

EfficiencySoftware should not make the best use of the systemresources.

Usability

Software must be usable by the users for which it wasdesigned. This means it must be understandable, easyintractable and compatible with other systems.

7


8/23

The software-development life-cycle is used to facilitate

the development of a large software product in a

systematic, well-defined, and cost-effective way.

The software development life-cycle consists of several

phases which are needed to be identifiable along with

defining the entry and exit criteria for every phase.

8


9/23


10/23

10

Requirementanalysis

anddefinition

Systemdesign

Detaileddesign

IMPLEMENTATION

Integration,Test,and

Verification

Systemverification

and validation

Operationand

maintenance


11/23

The software architecture of a program or a computing

system is the structure or structures of the system, which

comprise software components ,the externally visible

properties of those components and the relationships

among them.

11


12/23

12

Layered Architecture


13/23


14/23

Isolate Application in upper layers from HW changes.

Reusability of HW driver among different applications.

Easier in Testing.

14


15/23

Integration of functional modules from multiple suppliers.

Easier Software updates and upgrades.

Reduction of total SW

development costs.

15


16/23

Distinguishes on the highest abstraction level betweenthree software layers: Application, Runtime Environment

and Basic Software which run on a Microcontroller.

16


17/23

AUTOSAR Basic Software is further divided in the layers:Services layer, ECU Abstraction layer, Microcontroller

Abstraction layer and Complex Drivers.

17


18/23

The Microcontroller Abstraction Layer is the nearestsoftware layer to the microcontroller.

It contains internal drivers, which are software modules

with direct access to the Cand internal peripherals.

18


19/23

The ECU Abstraction Layer interfaces the drivers of theMicrocontroller Abstraction Layer. It also contains drivers

for external devices.

It offers an API to access the peripherals and devices

regardless their location (port pins, type of interface).

19


20/23

The Services Layer is the highest layer of the BasicSoftware which also applies for its relevance for the

application software: while access to I/O signals is covered

by the ECU Abstraction Layer.

20


21/23

The Complex Drivers Layer spans from the hardware tothe RTE.

Provides the possibility of integrating special purpose

functionality, e.g. drivers for devices, which are not

specified within AUTOSAR.

21


22/23

Thank you for

your attention!

Any Questions?

22


23/23

Contact Details

Eng.Mohamed El SobkyEmbedded Software Engineer

Tel: 01019429937

[email protected]

23

Documents

3 Embedded Software