In a preemptive priority based RTOS, priority inversion problem is among the major sources of deadline violations. Priority inheritance protocol is one of the approaches to reduce priority inversion. Unfortunately, RTOS like uC/OS can’t support priority inheritance protocol since it does not allow kernel to have multiple tasks at the same priority. Although it has different ways to avoid priority inversion such as priority ceiling protocol, developers still have some difficulties in programming real time applications with it. In this paper, we redesign the uC/OS kernel to provide the ability to support round robin scheduling and implement priority inheritance semaphore on the modified kernel. As result, we port new kernel with priority inheritance semaphore to evaluation board, and evaluate the execution time of each of the kernel service as well as verify the operations of our implementation.
标签： priority preemptive inversion problem
上传时间： 2015-12-13
上传用户：气温达上千万的
scmRTOS is real-time preemptive operating system and supports up to 31 user processes (and one system idle process).
标签： preemptive and real-time operating
上传时间： 2017-06-21
上传用户：yulg
scmRTOS is real-time preemptive operating system and supports up to 31 user processes (and one system idle process).
标签： preemptive and real-time operating
上传时间： 2017-06-21
上传用户：894898248
The main purpose of this project is to add a new scheduling algorithm to GeekOS and to implement a simple synchronization primitive (semaphore). As you might have already noticed, GeekOS uses a simple priority based preemptive Round Robin algorithm. In this project, you will change this to a multilevel feedback scheduling. In addition, you will provide user programs with semaphores, a means to check the system s current time and a mechanism for passing command-line arguments
标签： scheduling algorithm implement to
上传时间： 2013-11-27
上传用户：Late_Li
摘要：介绍了以FreeModbus协议找在嵌入式抢占实时操作系统μC/OS-l的STM32平台上，成功实现了Modbus协议的移植。通过详细分析FreeModbus协议花并编写STM32F103VET6微处理器的底层驱动，成功实现了工业Modbus协议RTU和ASCll两种模式的通信功能。测试结果表明，在实际工业生产控制和仪表开发中，应用Freemodbus协议，完全符合工业数据采集、实时控制和数据处理等厂级重复性和精确度要求，在一定程度上降低了工业仪表开发的周期及成本。关键词：实时操作系统，uC/OS-ll，FreeModbus，Modbus协议，STM32Abstract:This paper introduces FreeModbus stack transplanted to the STM32 platform which has been embedded in the preemptive real-time operating system uC/OS-ll，in order that the transplantation of the Modbus protocol is successfuly im-plemented.The FreeModbus stack is analyzed in detail and STM32F103VET6 microprocessor underlying driver is writed，so that the two Modbus industrial communication function RTU and ASCll are successfully realized.Keywords:time operating system，uC/OS-ll，.FreeModbus，Modbus协议，STM32
标签： freemodbus 通信协议
上传时间： 2022-06-25
上传用户：lw125849842
Visual Studio Ultimate 2012 是一个最先进的开发解决方案，它使各种规模的团队能够设计和创建出使用户欣喜的引人注目的应用程序。 用户可以使用灵活敏捷的规划工具（如容量规划、任务板和积压工作管理）来按照您自己的进度实现增量开发技术和敏捷方法。使用高级建模、发现和体系结构工具可描述您的系统并帮助确保实现您的体系结构构想。 通过使用生产中的 IntelliTrace、Operations Manager Connector 和 preemptive Analytics，使开发团队和运营团队能够很好地协作。通过从部署的软件生成可对其采取措施的 Bug 来改进质量和减少解决时间，让运营人员高效协作以提供使开发人员能够深入了解生产问题的数据。
上传时间： 2013-04-15
上传用户：eeworm
