measurements of power consumption for i.mx51

[bergo]

Hey everyone,

I have the i.mx51 evk, using freescale source code and ltib I compiled a slim kernel with all power management attributes available.

It seems to be running fine so far.

There are couple of testings I want to do but I can't find the way to do them, I would appreciate any help or ideas.

I want to run some code and see what is the power consumption during RUN mode and STOP mode.

Also I'm wondering how do I switch between the modes.

Last but not least, is there a way to measure the time it takes to switch from RUN to STOP and from STOP to RUN ?

Many thanks in advance !

[bergo]

Thanks for all the help,

Do you know how can I switch to other power management modes other then STOP and RUN ?

To whom it may concern, I found in the user's guide under power measurement point that you can check the voltage on transistors R70 and R74 (they are found in the back panel in the center) to calculate the power consumption.

[Yuri]

From app note AN4051 (i.MX51 EVK Supply Current Measurements)

Use the following command to enter STOP mode in Linux: echo mem > /sys/power/state.

http://cache.freescale.com/files/dsp/doc/app_note/AN4051.pdf

[bergo]

Thanks for your response Yuri,

I'm connecting the EVB to my computer using minicom,

I see the following message when I'm going into STOP mode :

"

Freezing user space processes ... (elapsed 0.01 seconds) done.

Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.

Suspending console(s) (use no_console_suspend to debug)

"

My question is: How can I manually bring it back so RUN mode? the console doesn't respond and I have to perform a hard reset to bring it back to life.

thanks !

[lily_zhang]

Please press power key to resume the system.

You can also use rtc wakeup.