can the pru be executed when the beaglebone is off?

[diego]

Hi.

I want to implement a low-cost energy process that is independent of the main CPU and runs when the Beaglebone is powered off. can  PRU the beagle to run alone even if it does not have the operating system.

Thank you

[Przemek Klosowski]

On Thu, Jan 18, 2018 at 10:11 AM, diego <diego.es...@gmail.com> wrote:

I want to implement a low-cost energy process that is independent of the main CPU and runs when the Beaglebone is powered off. can  PRU the beagle to run alone even if it does not have the operating system.

The PRU is conjoined with the main CPU, so  it won't run if you power the beaglebone off, of course. You could probably put CPU to sleep but keep PRU going, but I am not sure how much power will it save--you'd still have to power memory and all the peripheral chips (PMIC etc).

In general, beaglebone is not exactly a low power platform.  If you want long-running power efficient operation, you probably should use one of the low-end microcontrollers like CortexM, or MSP430 to do the low energy part, and maybe power up the Beaglebone to do the high-power stuff if you need it.