從結構上來說，實時多任務操作系統包括兩部分，一部分為操作系統內核(kernel)，即實時執行程序(Real Time Executive:RTX)，另一部分是輸入輸出部分(I/O)(注意開發系統不屬于操作系統的范疇)；嵌入式系統對I/O的需求通常比較小(無文件系統需求)，因此很多實時多任務操作系統本質上就是一個實時執行程序，如AMX(Kadak)，VRTX(Microtec)，iRMX(Intel)等(這里的X即:eXecutive)，如果純粹從kernel的角度來考察目前流行的各種實時多任務操作系統的性能，它們的效率差別都不大。 在市面上可以得到一些RTX的源代碼(有用C實現的，有用匯編實現的，還有用PL/M語言實現的)，從internet上也可以蕩一些下來(我介紹一個站點www.eg3.com，堪稱世界電子工程師資源寶庫)，下面我要介紹的一個RTX版本(我命名為SRTX:short RTX)，可以說是RTX中的元老級產品了，來自某研究所，九十年代初他們到美國考察，從美國某公司購得。五年以前，SRTX在國內有售，許多搞工控的研究所利用SRTX開發了一些大型或小型的產品,這里介紹的SRTX我作了一些簡化和改動.
標簽：
上傳時間： 2015-12-09
上傳用戶：wang5829
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
This application report describes the use of Timer_A3 to decode RC5 and SIRC TV IR remote control signals. The decoder described in this report is interrupt-driven and operates a background function using specific features the Timer_A3. Only a small portion of the MSP430 CPU?s nonreal-time resources is used. Specific hardware bit-latching capabilities of the Timer_A3 module are used for real-time decoding of the IR data signal, independent and asynchronous to the CPU. CPU activity and power consumption are kept to an absolute minimum level. The Timer_A3 decoder implementation also allows other tasks to occur simultaneously if required. The solutions provided are written specifically for MSP430x11x(1) and MSP430x12x derivatives, but can be adapted to any other MSP430 incorporating Timer_A3. 電視遙控器設計基於MSP430
標簽： application describes Timer_A control
上傳時間： 2014-01-01
上傳用戶：qq21508895
celestia源代碼，Celestia, a real-time 3D space simulation featuring a database of over 100000 stars, nearly a hundred solar system, objects, and a complete catalog of extrasolar planets.
上傳時間： 2013-12-26
上傳用戶：縹緲
Rao-Blackwellised Particle Filters (RBPFs) are a class of Particle Filters (PFs) that exploit conditional dependencies between parts of the state to estimate. By doing so, RBPFs can improve the estimation quality while also reducing the overall computational load in comparison to original PFs. However, the computational complexity is still too high for many real-time applications. In this paper, we propose a modified RBPF that requires a single Kalman Filter (KF) iteration per input sample. Comparative experiments show that while good convergence can still be obtained, computational efficiency is always drastically increased, making this algorithm an option to consider for real-time implementations.
標簽： Particle Filters Rao-Blackwellised exploit
上傳時間： 2016-01-02
上傳用戶：refent
With this foundation, you explore a development model that addresses the complete range of issues in the design of embedded communications software, including real-time operating systems, hardware and software partitioning, layering, and protocol stacks.
標簽： development foundation addresses complete
上傳時間： 2016-01-16
上傳用戶：zyt
實時系統分析與設計，《REAL-TIME SYSTEMS DESIGN AND ANALYSIS》THIRD EDITION Phillip A. Laplante
上傳時間： 2013-12-09
上傳用戶：xmsmh
Sofia-SIP is an open-source SIP User-Agent library, compliant with the IETF RFC3261 specification. It can be used as a building block for SIP client software for uses such as VoIP, IM, and many other real-time and person-to-person communication services. The primary target platform for Sofia-SIP is GNU/Linux. Sofia-SIP is based on a SIP stack developed at the Nokia Research Center.
標簽： specification open-source User-Agent Sofia-SIP
上傳時間： 2016-03-20
上傳用戶：洛木卓
Sofia-SIP is an open-source SIP User-Agent library, compliant with the IETF RFC3261 specification. It can be used as a building block for SIP client software for uses such as VoIP, IM, and many other real-time and person-to-person communication services. The primary target platform for Sofia-SIP is GNU/Linux.
標簽： specification open-source User-Agent Sofia-SIP
上傳時間： 2016-04-10
上傳用戶：watch100
Qpsk signal Processing Code The DSP code should be efficient and accurate to properly demodulate the incoming signal. The DSP can be coded strictly in “C” or C-language can be intermingled with assembly code.include Real Time Digital Signal Processor Code – Main.c file BER Test Code
標簽： Processing demodulate efficient accurate
上傳時間： 2014-08-10
上傳用戶：dancnc
