Latest News Items: FAT file system released - Tick suppression demo'ed SAM4L MCU & RX100 MCUs - embTCP released for PIC32

A Real Time Engineers Ltd. Brand Advertise here?      Quick Start Supported MCUs Books & Kits Ecosystem Training Contact & Support
FreeRTOS+ Ecosystem Showcase  New File System:  DOS compatible FAT FS  UDP/IP:  Thread aware UDP stack  Trace:  Run-time analysis tool  IO:  read(), write(), ioctl() interface  CLI:  Command line interface  Nabto:  Webserver in 1K, see how  TCP/IP:  Low cost pre-ported libraries  CyaSSL SSL / TLS:  Networking security protocols  Safety:  TUV certified RTOS for MCUs  RTOS Training:  Delivered online or on-site FreeRTOS Sponsors Last site update May 1 2013		FreeRTOS Sponsors Get seen by 1000s of embedded engineers a month Software Timers [More about software timers...] The timer service/daemon task, and the timer command queue Timer functionality is optional, and not part of the core FreeRTOS kernel. It is instead provided by a timer service (or daemon) task. FreeRTOS provides a set of timer related API functions. Many of these functions use a standard FreeRTOS queue to send commands to the timer service task. The queue used for this purpose is called the 'timer command queue'. The 'timer command queue' is private to the FreeRTOS timer implementation, and cannot be accessed directly. The diagram below demonstrates this scenario. The code on the left represents a function that is part of a user application, and called from a task that is created as part of the same user application. The code on the right represents the timer service task implementation. The timer command queue is the link between the application task and the timer service task. In this demonstrated case, the xTimerReset() API function is called from the application code. This results in a reset command being sent to the timer command queue for processing by the timer service task. The application code only calls the xTimerReset() API function - it does not (and cannot) access the timer command queue directly. The context of the application code, the FreeRTOS timer API, the timer command queue, and the timer service task. [ Back to the top ]    [ About FreeRTOS ]    [ Sitemap ]    [ ] Copyright (C) 2004-2010 Richard Barry. Copyright (C) 2010-2013 Real Time Engineers Ltd. Any and all data, files, source code, html content and documentation included in the FreeRTOSTM distribution or available on this site are the exclusive property of Real Time Engineers Ltd.. See the files license.txt (included in the distribution) and this copyright notice for more information. FreeRTOSTM and FreeRTOS.orgTM are trade marks of Real Time Engineers Ltd.