i.MX ProcessorsのトピックRe: linux interrupt time

linux interrupt time

2548903578 — Wed, 08 Sep 2021 01:27:51 GMT

Hi,everyone

When I use imx6sx to configure the interrupt, the external will trigger an interrupt every 20ms, but the interrupt is not entered immediately after the interrupt is triggered, and there will be a certain delay. This delay time is about 10us. The problem now is that it is okay if the delay is 10us each time, but I found that the time of each entry interrupt is not fixed, sometimes it is long and sometimes short. There will be a certain error in this way. Does anyone know how to solve this problem? We are expecting a reply.

Re: linux interrupt time

2548903578 — Wed, 08 Sep 2021 03:16:14 GMT

I played the rt package and still the same situation.

Re: linux interrupt time

igorpadykov — Wed, 08 Sep 2021 07:41:44 GMT

Hi zxs

one can try fiq or rt patches or process interrupt on m4

https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/i-MX6-AVB-Demo-Implementation/ta-p/1127045

https://community.nxp.com/t5/i-MX-Processors/How-to-port-RTLinux-on-iMX6-board/td-p/380941

or "Real-Time Edge Software"

https://www.nxp.com/design/software/development-software/real-time-edge-software:REALTIME-EDGE-SOFTWARE

Best regards
igor

Re: linux interrupt time

2548903578 — Wed, 08 Sep 2021 07:44:56 GMT

Hi，igorpadykov

Can rt patches make the interruption time stable? I tested it and found that it is not as good as not adding it. We are using pin input interrupt, does fiq support it? Our m4 can only open one interrupt, so no other interrupts can be used.

Re: linux interrupt time

2548903578 — Wed, 08 Sep 2021 08:02:27 GMT

Hi,igorpadykov

Real-Time Edge Software does not support imx6sx platform, only imx6ull.

LS1046A: Layerscape® 1046A and 1026A Processors
i.MX6ULL: i.MX 6ULL Single-Core Processor with Arm® Cortex®-A7 Core
LS1028A: Layerscape® 1028A Applications Processor
i.MX8MMINI: i.MX 8M Mini - Arm® Cortex®-A53, Cortex-M4, Audio, Voice, Video
LX2160A: Layerscape® LX2160A, LX2120A, LX2080A Processors
LS1043A: Layerscape® 1043A and 1023A Processors
IMX8MPLUS: i.MX 8M Plus – Arm® Cortex®-A53, Machine Learning, Vision, Multimedia and Industrial IoT
LS1021A: Layerscape® 1021A Dual-Core Processor with LCD Controller
LS1012A: Layerscape® 1012A Low Power Processor

Re: linux interrupt time

igorpadykov — Wed, 08 Sep 2021 08:19:16 GMT

you can port it yourself using i.MX6ULL as example.

Best regards
igor