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WHAT'S NEW
FreeRTOS website now available in Simplified Chinese
Search and browse content in your preferred language. See the blog post.
New FreeRTOS Long Term Support version now available.
Receive security patches and critical bug fixes on FreeRTOS libraries for two years. See the blog post.
FreeRTOS Extended Maintenance Program (EMP) registration now open.
Providing security patches and critical bug fixes on FreeRTOS Long Term Support (LTS) versions for up to 10 additional years. See the blog post.
FreeRTOS-Plus-TCP v3.0.0 released:
We've added comprehensive unit tests and penetration and protocol testing. See the blog post.
Featured FreeRTOS IoT Integrations:
Introducing three featured integrations for more secure IoT applications. See the blog post.

Software Timers
[More about software timers...]

One-shot timers versus auto-reload timers

There are two types of timer, one-shot timers, and auto-reload timers. Once started, a one-shot timer will execute its callback function only once. It can be manually re-started, but will not automatically re-start itself. Conversely, once started, an auto-reload timer will automatically re-start itself after each execution of its callback function, resulting in periodic callback execution.

The difference in behaviour between a one-shot timer and an auto-reload timer is demonstrated by the timeline in the diagram below. In this diagram, Timer 1 is a one-shot timer that has a period equal to 100, and Timer 2 is an auto-reload timer that has a period equal to 200.

The behaviour of one-shot timers and auto-reload timers
The behaviour of one-shot timers and auto-reload timers





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