87 lines
2.7 KiB
Markdown
87 lines
2.7 KiB
Markdown
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- Thin software layer
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- Basic programming abstractions
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- Interact with hardware
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- Schedule and prioritise tasks
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- Mediate between applications and services requiring resources
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[Comparison of Operating Systems TinyOS and Contiki](https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.636.3680&rep=rep1&type=pdf)
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# Environment
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- Energy efficiency
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- Restricted code
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- Compared to full OS
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# Features
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- Memory management
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- Power management
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- File management
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- Networking
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- Dev environment and tools
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- Commands
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- Interpreters
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- Compilers
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- Entry points for sensitive resources
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- Input components
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- Functional aspects
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- Scheduling
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- Multi-threading
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- Interrupts
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- Memory allocation
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# Dynamic Programming
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- Program parts of application after deployment
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- Settings and requirements not known prior to deployment
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- Can change over time
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- Bug fixes or update requirements wile in operation
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- Manual updates maybe not possible
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- Needs boundaries between application and OS
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- OS receive software updates and store in active memory
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- Check this is an updated version
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- Install and configure new version
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# Paradigm
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- Node-centric
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- Focuses on software for each node
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- Operating individually
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- Application-centric
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- Treat nodes as one application
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- Requires collaboration between nodes
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- Collection
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- Dissemination
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- Analysis and/or processing of generated and collected data
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# Deploy to Mote
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- Compile
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- make TARGET=xm1000 _____
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- Deploy
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- make TARGET=xm1000 _____.upload
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- As root
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- Terminal
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- make TARGET=xm1000 login
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# TinyOS
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*Embedded, component-based operating system and platform for low-power wireless devices, such as those used in [wireless sensor networks](https://en.wikipedia.org/wiki/Wireless_sensor_network) (WSNs), [smartdust](https://en.wikipedia.org/wiki/Smartdust), [ubiquitous computing](https://en.wikipedia.org/wiki/Ubiquitous_computing), [personal area networks](https://en.wikipedia.org/wiki/Personal_area_network), [building automation](https://en.wikipedia.org/wiki/Building_automation), and [smart meters](https://en.wikipedia.org/wiki/Smart_meter)*
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From <[https://en.wikipedia.org/wiki/TinyOS](https://en.wikipedia.org/wiki/TinyOS)>
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- Written in nesC
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- Network Embedded Systems C
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- Component-based
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- Wired together to run applications
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- Event-driven
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- Extension to C
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- Non-blocking
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- One stack
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- No abstraction between OS and application
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- No dynamic programming
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- I/O ops longer than hundreds of milliseconds are async
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- Mainly event-based
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# FreeRTOS
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- Minimal ROM, RAM, processing overhead
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- Bin image 6K - 12K
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- 3 C files
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- Smaller & easier real-time processing alternative
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- Port layer
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- Architecture specific part of port
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- Officially supported or contributed
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- Good for AWS
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