Userspace notification

[mathew_k_t]

Hi,

I'm working with imx6ull board. Currently, I'm developing a device driver for an SPI device.

In my driver, I'm using a GPIO interrupt. The interrupt is very fast and occurs at every 5ms. I would like to notify userspace application regarding this interrupt.

1. Please suggest a suitable method for this type of notification(fast and efficient).
2. Whether asynchronous notification is a good solution?
3. Is there any way to enable or disable interrupts from userspace?

Thanks and Regrads

[Carlos_Musich]

Hi mathew,

there are many approaches, I think the easiest one would be to create an input to a file created in some path inside /sys/... Then you will be able to read this file in user space, you would need to have a thread polling this flag. The problem here is that the time it may took to read the flag wont be always the same. In this case I would suggest to use an RTOS.

You could consider i.MX6SX or i.MX7D wich have a M4 core that can run a RTOS. You can download FreeRTOS BSP for i.MX6SX and i.MX7D from our web page.

Regards,
Carlos
NXP Technical Support
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