Going fast by being lazy

ARM, with the Cortex M architecture, delivers valuable hardware resources to enable context switching. The interrupts support both round robing ...

This example shows how to use the SysTick exception to switch tasks, and demonstrates the lazy floating-point state preservation optimization. It is a ...

As an example, the following diagram shows how the fields in ICH_VMCR_EL2 map on to the ICV register state. The active virtual priorities must be saved and ...

I try to initialize minimal hardware (which makes no difference) and make a call to xPortStartScheduler(). In portRESTORECONTEXT() macro I am getting a ...

When an RTOS scheduler decides a different task should be run than what is currently running, it will trigger a context switch. When switching ... Cortex-M ARM MCU Features · Registers · Demystifying the FreeRTOS... · The Port

I'm trying to write a context switch in a timer interrupt handler. Currently, the context switch is able to switch between contexts on command (cooperative).

The simplest example is an operating system with 2 threads (1 producer, 1 consumer) where the switch can look similar to the code here. The  ...

簡單的說，'context switch' 就是切換 'context'。而所謂的'context'，指的就是當下CPU registers 的內容。 因為當程式在執行時，所做的事情就是從memory ...

The context switch happens in an interrupt handler. Once an interrupt occurs, the NVIC hardware automatically stacks an exception frame.

This week I wrote an article containing the information I've always wished could be found in one place on the topic of Cortex-M RTOS context switching.