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I’m running embedded Linux (Angstrom) on an Atmel board (at91 sam9g25) mounting an ARM MCU.
I’d like to set the CPU in idle mode, ideally from userspace by using a function (then the system would be waken up by an hardware gpio interrupt). How can I do that? Alternatively, how can it be done in kernelspace?
I cannot find much, maybe somebody has some example to start from?
Try checking this page . Try also reading Optimizing Power Consumption for AT91SAM9261-based Systems to have an idea about what you can do with power management.
What you can basically do is setting the state you want in
/sys/power/statebut before entering the low-power state you need to set how your system can be awakened.Be advised that, in my experience, I have seen a lot of different behaviors by changing the kernel, so by patient and try different versions.