PA5, PA6, and PA7 are connected to LD_1, LD_2, and LD_3 as shown in the next table. This board contains the STM32F401RE, a 32-bit microcontroller with an ARM Cortex-M4 core. The Nucleo-F401RE board is used for all the examples. finally, a third program alleviating somehow the priority inversion –using mutexes with priority inheritance- will be elaborated and tested.then a second program where two tasks are sharing a signaling binary semaphore getting into priority inversion will be presented.the execution of a RTOS-based program without communications among three tasks will be presented first.This situation may allow a medium priority task M to run, delaying the execution of H. For example, L holds a semaphore that H must wait to continue executing. In this post, a Segger J-Link Edu probe and Percepio TraceAnalyzer are used.Ī common bug in RTOS-based applications is priority inversion, that occurs when a high priority task H is indirectly preempted by a low priority task L. Frequently you must employ advanced debugging tools allowing the examination of the system’s inner behavior very closely, with minimal intromission. Printing messages as a debugging tool is very limited and intrusive. Last but not least, the parallel nature of the RTOS-based applications makes the code debugging a difficult task. Also, the embedded systems developer needs to learn how the use of the RTOS itself, like its configuration and the API functions for controlling tasks and communicating between them. Developers should start by using rate monotonic scheduling (RMS) to get a general feel for whether their periodic tasks can be scheduled successfully. … Continue reading. Runtime priorities and periods must be assigned to tasks: it is not immediately obvious what the best solution is Selecting task priorities can be a challenge. An RTOS-based application uses tasks running in parallel that are interacting and competing for resources. However, learning to use an RTOS is not easy. In addition, a RTOS enables easier software modularization and reusability, thus improving software development productivity as well as improved system reliability.
An RTOS typically provides a hard real time response, providing a fast, highly deterministic reaction to external events. USB VBUS or external source(3.A real-time operating system (RTOS) provides:įacilitating the creation of complex applications. Selection-mode switch to use the kit as a standalone ST-LINK/V2-1 On-board ST-LINK/V2-1 debugger/programmer with SWD connector.STMicroelectronics Morpho extension pin headers for full access to all STM32 I/Os STM32 microcontroller with LQFP64 package.
The order code is printed on a sticker placed at the top or bottom side of the board Y describes the code size (8 for 64K, B for 128K, E for 512K).The Nucleo-F401RE board configuration was elaborated using STM32CubeIDE. PA5, PA6, and PA7 are connected to LD1, LD2, and LD3 as shown in the next table. R describes the pin count (R for 64 pins) This board contains the STM32F401RE, a 32-bit microcontroller with an ARM Cortex-M4 core.
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