AUTOSAR
tight bond between base software and hardware leads to reduced flexibility in hardware choices
reuse of software modules across customers is possible when abstraction via AUTOSAR standard is used
Run Time Environment
middleware which realizes the communication between SW components and the basic software
Basic Software Layer
ECU Specific Components
- Operating System
- MCAL (Microcontroller Abstraction Layer)
ensures standard interface to the basic software and manages MCU peripherals
Notification mechanism
1. Distribution of commands
2. Response
3. Information
Layer Subdivision
Controller Driver | Memory Driver | Comm Driver | IO Driver
- Complex Device Driver
Complex device driver is specialized layer provided by AUTOSAR in case the application needs to access the hardware in a faster way for time-critical applications
ECU Abstraction Layer
Provides software interface to the electrical values of any specific ECU
Layer Subdivision
On-board device abstraction | Memory hardware abstraction | Comm hardware ab | IO hardware ab
ex) Memory hardware ab : on-chip EEPROM and external EEPROM should be accessible via equal mechanism
Service Layer
Layer Subdivision
OS services | Memory services | Comm services
AUTOSAR Interface Predefines Function API
ex) for reading IO pin : DIO_ReadChannel()
ASW & BSW : Software Components
application SW component contained in Atomic Software Component types
RTE is not bypassed in any case
How to choose the software component type
Example)
1. Sensor reading from speed sensor reports maximum speed has been reached
2. Cut off injection
3. Diagnostics information saved to NVM
Ports
Communication between AUTOSAR modules done via ports
- Provider port
- Receiver port
- Provider Receiver port
Information communicated between ports
- Sender Receiver Interface
- Client Server Interface
- NVData Interface
- Parameter Interface
- Mode Switch Interface
- Trigger Interface
Sender Receiver Interface : asynchronous communication to send or receiver data between software components
Client Server Interface : used for function calls
- Synchronouse call : client waits until server function runs and complets
- Asynchronous call : trigger server function and proceeds. server results fetched when required
'Others' 카테고리의 다른 글
| Human - Computer Interaction Class Project : Yes24 eBook App 개선안 (0) | 2021.06.24 |
|---|