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In embedded systems and control systems, watchdog timers are often used to activate fail-safe circuitry. When activated, the fail-safe circuitry forces all control outputs to safe states (e.g., turns off motors, heaters, and high-voltages) to prevent injuries and equipment damage while the fault persists. In a two-stage watchdog, the first ...
The Command Loss Timer Reset can be used for computer system rebooting, but only when multiple timers have not been reset—like the classical "Dead man's switch" of industrial transport use. Embedded systems need to be inherently self-reliant, as this is fundamentally part of their design. Embedded systems (like those on spacecraft) can't be ...
Nano-RK is a wireless sensor networking real-time operating system (RTOS) [1][2] from Carnegie Mellon University, designed to run on microcontrollers for use in sensor networks. Nano-RK supports a fixed-priority fully preemptive scheduler with fine-grained timing primitives to support real-time task sets. "Nano" implies that the RTOS is small ...
ATmega328 P in 28-pin narrow dual in-line package (DIP -28N). It is commonly found on Arduino boards. AVR is a family of microcontrollers developed since 1996 by Atmel, acquired by Microchip Technology in 2016. These are modified Harvard architecture 8-bit RISC single-chip microcontrollers.
Heartbeat (computing) In computer science, a heartbeat is a periodic signal generated by hardware or software to indicate normal operation or to synchronize other parts of a computer system. [1][2] Heartbeat mechanism is one of the common techniques in mission critical systems for providing high availability and fault tolerance of network ...
Polling (computer science) Polling, or interrogation, refers to actively sampling the status of an external device by a client program as a synchronous activity. Polling is most often used in terms of input/output (I/O), and is also referred to as polled I/O or software-driven I/O. A good example of hardware implementation is a watchdog timer.
This interconnect is known as the Peripheral Reflex System (PRS). Functionality is available at the lower Stop and Shutoff energy modes. The Stop mode includes analog comparators, watchdog timers, pulse counters, I 2 C links, and external interrupts.
If the high-priority task is left starved of the resources, it might lead to a system malfunction or the triggering of pre-defined corrective measures, such as a watchdog timer resetting the entire system. The trouble experienced by the Mars Pathfinder lander in 1997 [1] [2] is a classic example of problems caused by priority inversion in ...