topic Re: ISR latency in S32K

ISR latency

ZhouPengfei — Mon, 15 Jan 2024 06:15:39 GMT

Hi support,

Is there some data about the ISR latency of S32K3 serials.

I do a test on S32K324 used emios SAIC mode to capture edge. In the ISR, I flip a gpio.

The latency between the input signal and the flip signal is about 300ns, it seems to long for system clock 160MHz.

The priority of the interrupt is 1, the highest. And when I turn on CAN interrupt to send data which priority is 6. The latency is fluctuant, 300~600ns. It seems CAN interrupt

Re: ISR latency

Julián_AragónM — Mon, 15 Jan 2024 21:56:40 GMT

Hi @ZhouPengfei,

ISR latency depends on various factors. You can find a list of these factors and how to measure interrupt latency in this application note:

Measuring Interrupt Latency

This application note describes how to measure the interrupt latency of the i.MX RT1050 device, but the steps to measure and factors to take into account are the same. I hope you find this helpful.

Best regards,
Julián