Importance of kernel OS in embedded

The kernel of an operating system (usually an RTOS) is the central software layer between the application and the hardware. Its importance in embedded systems:

1. Multitasking: lets several activities (tasks) run concurrently on a single processor, so a complex system can be structured as simple independent tasks.
2. Real-time performance: the scheduler and fast, bounded interrupt handling guarantee deadlines are met.
3. Resource management: shares the CPU, memory and devices among tasks safely.
4. Inter-task communication and synchronisation: semaphores, mutexes, queues and mailboxes avoid data corruption and race conditions.
5. Hardware abstraction: drivers and system calls hide hardware details, improving portability and reuse of application code across processors.
6. Timing services: timers, delays and time-outs for periodic tasks.
7. Reliability and maintainability: a tested kernel reduces bugs; modular tasks are easier to change.
8. Reduced development time: developers concentrate on the application rather than on writing a scheduler.
9. Small footprint: embedded kernels use only kilobytes of memory and can be configured to include only the needed services.