Good time, bad time and real time in system software - CodeCamp16oct2010

Good Time, Bad Time and Real Time in System Software Kernel Base Team ( part of SSW team in IIC depart of Continental Iasi) October 2010

Overview of SSW Projects
Overview of RNS Project
Challenges in Embedded Automotive
Challenges in SSW
Extra

SSW Projects - Multimedia Overview

PL2+
2 CPUs: Coldfire and ST10
OS: FlexOS for Coldfire, OSEK for ST10
Features:
CDDA/MP3 CD/Radio with TA/TP/RDS support
DAB and SDARS
CAN communication
Bluetooth support / playback over USB
external CD/DVD changer over MOST
PL7
CPU: Coldfire
OS: FlexOS
Features:
CDDA/MP3 CD/Radio with TA/TP/RDS support
CAN communication
external phone / NAV
SSW Projects – Radio Projects

SSW Projects – Entry Navigation
HWM
CPU: TX49 64-bit (MIPS-based )
OS: OS-9000
Features:
Radio
CDDA / MP3
Navigation
Remote Control

SSW Projects – Entry Navigation
CCC
2 CPUs: SH4 and ST10
OS: VxWorks for SH4 and OSEK for ST10
Features:
CDDA / MP3
CD changer
phone support
TV tuner
SDARS
Rear View Camera + Parking Distance Control

SSW Projects - MIB Entry
CPU: Renesas SH2
OS: HI7000 (uItron kernel)
Features:
AM/FM Radio
CDDA/MP3/ WMA
SD-Card (SD 2.0/ SD HC)
USB 2.0(high speed)
CAN communication (500/1000 kBit/s)
Integrated Bluetooth access point
Phonebook memory
Product Upgrade via different media (SD-card, USB, CD)
Monochrome/Color Display + TouchScreen

SSW Projects - BMW L7
CPU: ARM9 (Jacinto)
OS: Microsoft Auto
Basic features:
Ergo Commander control
Double tuner FM/AM
CDDA/MP3/ WMA
SD-Card (SD 2.0/ SD HC)
High speed CAN
Ethernet (Flashing & Dealer Diagnostics)
External display (800x480 px), APIX interface, power supply in HU
Options:
Bluetooth connectivity
iSpeech (30k words)
MOST / CAN Gateway (INIC)
Video In
Browser, Online
Mediaplayer for USB
USB interface / 2nd USB
IBOC, SDARS, Double DAB+
Support of ExBox devices (ComBox, MMC, Top Hifi, RSE

Overview RNS ( TLA Platform )

RNS SSW Architecture

Challenges in Embedded Automotive
An automotive infotainment system is sold in very large volumes (e.g. > 500,000 RNS 510)
High pressure on BoM (HW and SW)
Systems designed to operate close to the limit
High pressure on reliability
Systems must operate for > 10 years (>15,000 hours)
A design defect can be catastrophic
Huge costs for recalls (Ex: Toyota’s recent recalls- more than 2 billions $)
High pressure on performance
E.g. Audio available in less than 1 second
High pressure on quality
Technical standards to be fulfilled
QA standards

Challenges in SSW
SSW delivers the foundation of the project
any delayed delivery of SSW affect the entire project
bugs in SSW are in most of the cases critical
SSW is responsible with HW bring-up
must adapt very fast to new CPUs and OS
handle a large variety of HW devices ( Flash, HDD, CD/DVD, SD, Touch Screen...)
SSW is must adapt external SW modules to available HW and OS
e.g. VW Diagnostics Framework
normal situation: external SW was never tested on our combination of CPU and OS

Challenges Hardware Synchronization

Challenges - Access Unaligned Data
VW Diagnostics Framework bug
In a header file: In a C file: If POS_LAST_QUALIFIED_DTC is odd, than an cpu exception is triggered

Challenges - Access Unaligned Data
Solution:
Conclusion: On some Embedded architectures 16 bit data must be aligned on a 16 bit boundary and 32 bit data must be aligned on a 32 bit boundary. Access to unaligned data may be caused by a corrupt pointer by an invalid offset or stack overflow. It is also possible to get this error if you cast a byte pointer to 16 bit or 32 bit data pointer.

Challenges - Accessing Invalid Pointers
What is the output of a call to MyFunction ?
a) crash at line 11
b) crash at line 13
c) the author is a moron

Challenges - Accessing Invalid Pointers
What is the output of a call to MyFunction ?
a) crash at line 11
b) crash at line 13
c) the author is a moron
d) *pMyPointerToInt=5 (MicroItron HI7000 on SH2A)
Of course, something like this will cause an error, but this will manifest later and in another module. Detection of this kind of bugs is a nightmare.

Embedded life

SSW – Diversity of Education Background

Kernel Base Team – Author of this Presentation

Good time, bad time and real time in system software - CodeCamp16oct2010

by CodeCamp/Iasi on Oct 25, 2010

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Good time, bad time and real time in system software - CodeCamp16oct2010 — Presentation Transcript