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Android / AM3517 / Sleep modes

Tim Sloper
Intellectual 1750 points
Other Parts Discussed in Thread: AM3517, ADS7846

Any asssitance would be greatly appreciated with the Android related question below...

"We need to be able to operate the AM3517 in a ‘low power mode’ when in standby.

In this condition we need some basic serial communications, and would like to show a static video screen.  Ability to sense the touchscreen would also be good, if possible.

 

The datasheet mentions that clock management is included but we are unable to ascertain the details as to how it may be controlled to go into a lower power mode.

Is this possible?"

Thank you,

Tim 

 

  • 0
    TI__Genius 10210 points

    It is possible to keep the debug serial console alive even when android goes into sleep. I think, this is done by an additional bootargs parameter. Don't recall the exact parameter now, unfortunately.

    Regarding showing a static video screen, I am not in a position to help. Hopefully, someone else here has an answer.

  • 0 in reply to Vishveshwar Bhat
    TI__Expert 7220 points

    The additional bootarg for the same is "no_console_suspend".

    As of now basic suspend/resume to memory is supported. LCD will be off in this case.

    Static video screen might not be possible in this state.

    Touch screen wake up can be enabled from Android layer once it is supported from Linux Kernel Driver.

    ADS7846 touch screen driver supports wake up. But the default touch screen TSC does not supports wake up.

     

     

  • 0 in reply to Arun Joseph
    Intellectual 310 points


    Logic PD release their new Wattson software for the AM3517 EVM today which will help you see actual power consumption across all power rails on the CPU and SOM design.  There is an adapter required to connect to the PC available from this website: http://createnewstuff.webs.com/breakoutboardwattson.htm

    The Logic PD software is available from here: http://www.logicpd.com/wattson

     

    -A