Speedrun timer latency12/20/2023 ![]() ![]() It needs to save the current CPU registers, program counter address, and shadow registers. CPU Context Saving & SwitchingĬontext Saving & Switching is a process that the CPU needs to do just to smoothly switch between main program execution and ISR handlers. Just to eliminate any misconception or misunderstanding. If someone wants to point to anything else, this needs to be explicitly stated and avoid using any term of those two. And the conclusion is: those terms can be used interchangeably to point to the time between a hardware IRQ firing event & start of ISR. There are so many debates online about this and we, me and my work colleagues, did also debate this subject a lot. Which is exactly the same definition for interrupt latency. Interrupt Response Time is the time between the actual interrupt request (IRQ) signal and the CPU starting to execute the first instruction of the (ISR) interrupt handler function. In this tutorial, we’ll discuss the reasons behind interrupt latency and a couple of techniques with code examples to measure the interrupt latency in Arduino (Atmega328p) microcontroller. ![]() So it’s considered to be one of the key characteristics of each CPU that we can assess or measure to know exactly how long it actually is for a given CPU. And it’s usually expressed in CPU clock cycles or time (in μs or ns).Įach CPU has its own interrupt latency which is dictated by the way it handles interrupt signals and some other hardware implementation variations. Interrupt Latency is defined to be the time between the actual interrupt request ( IRQ) signal and the CPU starting to execute the first instruction of the ( ISR) interrupt handler function. Interrupt Latency Measurement 2 – Arduino Example.Interrupt Latency Measurement 1 – Arduino Example.Without further ado, let’s get right into it! Table of Contents We’ll create a test setup and code example to run the measurement process and discuss the results to draw some conclusions. In this tutorial, we’ll discuss Interrupt Latency & Response Time (Interrupt Speed) in Arduino what it means, how you can measure it on your own, and what it does affect in your project. ![]()
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