How to make SPI communication in realtime?
I have used UP Board, with 4.15 low-latency linux kernel from https://launchpad.net/~aaeon-cm/+archive/ubuntu/up/+packages.
When i run spi application will get 10ms latency, meanwhile normal cost time is 0.8ms.
We found spi in the kernel is stuck by irq, but we have no idea about that.
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