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.
標簽： priority preemptive inversion problem
上傳時間： 2015-12-14
上傳用戶：氣溫達上千萬的
scmRTOS is real-time preemptive operating system and supports up to 31 user processes (and one system idle process).
標簽： preemptive and real-time operating
上傳時間： 2017-06-22
上傳用戶：yulg
scmRTOS is real-time preemptive operating system and supports up to 31 user processes (and one system idle process).
標簽： preemptive and real-time operating
上傳時間： 2017-06-22
上傳用戶：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
標簽： scheduling algorithm implement to
上傳時間： 2013-11-27
上傳用戶：Late_Li
摘要：介紹了以FreeModbus協議找在嵌入式搶占實時操作系統μC/OS-l的STM32平臺上，成功實現了Modbus協議的移植。通過詳細分析FreeModbus協議花并編寫STM32F103VET6微處理器的底層驅動，成功實現了工業Modbus協議RTU和ASCll兩種模式的通信功能。測試結果表明，在實際工業生產控制和儀表開發中，應用Freemodbus協議，完全符合工業數據采集、實時控制和數據處理等廠級重復性和精確度要求，在一定程度上降低了工業儀表開發的周期及成本。關鍵詞：實時操作系統，uC/OS-ll，FreeModbus，Modbus協議，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協議，STM32
標簽： freemodbus 通信協議
上傳時間： 2022-06-25
上傳用戶：
Visual Studio Ultimate 2012 是一個最先進的開發解決方案，它使各種規模的團隊能夠設計和創建出使用戶欣喜的引人注目的應用程序。 用戶可以使用靈活敏捷的規劃工具（如容量規劃、任務板和積壓工作管理）來按照您自己的進度實現增量開發技術和敏捷方法。使用高級建模、發現和體系結構工具可描述您的系統并幫助確保實現您的體系結構構想。 通過使用生產中的 IntelliTrace、Operations Manager Connector 和 preemptive Analytics，使開發團隊和運營團隊能夠很好地協作。通過從部署的軟件生成可對其采取措施的 Bug 來改進質量和減少解決時間，讓運營人員高效協作以提供使開發人員能夠深入了解生產問題的數據。
上傳時間： 2013-04-15
上傳用戶：eeworm
