Hi Wen,
I do have a similar requirement in my project, PRU writing to
flash. Do you have any leads over this??
Thanks,
satya
On Monday, July 29, 2013 at 10:09:34 AM UTC-5, WenZhan Song wrote:
>
> I have three questions about BBB power consumption:
>
> (1) Does anyone have a measurement of BBB power consumption when CPU
> sleeps and all peripherals are off through software command?
>
> (2) Does anyone know whether its PRU can still run while CPU sleeps? We
> intend to use PRU to read data from a SPI bus, timestamp it and write to
> flash. Is it possible to be done without CPU involvement?
>
> (3) What is the lowest CPU speed of BBB through voltage scaling and what
> will be its power consumption difference comparing to highest speed? We
> also intend to change the CPU speed to reduce power consumption, as out
> task is not so computing intensive all the time.
>
> (4) Looks like the default OS of BBB (e.g., Angstrom) does not support
> sleep mode, anyone knows a way to patch it? Becaue of that we currently
> plan to use either TI's linux or android for this purpose. Any suggestions?
>
> Thanks!
>
> WenZhan
>
> On Wednesday, May 15, 2013 12:08:10 PM UTC-4, Gerald wrote:
>>
>> Best way would be to modify the kernel.
>>
>> Gerald
>>
>>
>> On Wed, May 15, 2013 at 10:38 AM, <[email protected]> wrote:
>>
>>> Hi Gerald,
>>>
>>> I only need the SD card, Ethernet, and ttyS0 active for now.
>>> Is there a facility for sending the I2C commands in /sys or a /dev
>>> entry, or would I need to modify the kernel?
>>>
>>> Thanks.
>>>
>>>
>>>
>>> On Wednesday, May 15, 2013 5:27:52 AM UTC-7, Gerald wrote:
>>>
>>>> You can put the boar din a sleep mode depending on how much asleep you
>>>> want too go. You can turn of the 3.3V rail and the 1.8V rail to save power
>>>> by writing I2C commands to the TPS65217C.. I don't know
>>>> what peripherals you still want to be active so this may not work..
>>>>
>>>> You can power down the HDMI by sending I2C commands to it, but it may
>>>> or may not save you the amount of power you are looking for.
>>>>
>>>> Gerald
>>>>
>>>>
>>>> On Tue, May 14, 2013 at 11:04 PM, <[email protected]> wrote:
>>>>
>>>>>
>>>>> Ah..... maybe the question was misunderstood. I am not looking for
>>>>> measurements, as I can already
>>>>> measure power for myself. I am looking for ways to reduce power
>>>>> consumption. For example, on the
>>>>> original Beagleboard it was possible to disable video and save a fair
>>>>> amount of power.
>>>>>
>>>>>
>>>>>
>>>>> On Tuesday, May 14, 2013 4:20:44 PM UTC-7, Ben Loftin wrote:
>>>>>
>>>>>> not sure if you have seen this already, but section 6.1.7 of
>>>>>> reference guide
>>>>>>
>>>>>> http://www.digikey.com/web%20export/supplier%20content/ti_
>>>>>> 296/mkt/boards/BBB_SRM.pdf?redirected=1
>>>>>>
>>>>>> 6.1.7 Power Consumption
>>>>>> The power consumption of the board varies based on power scenarios
>>>>>> and the board boot
>>>>>> processes. Measurements were taken with the board in the following
>>>>>> configuration:
>>>>>> DC powered and USB powered
>>>>>> HDMI monitor connected
>>>>>> USB HUB
>>>>>> 4GB Thumbdrive
>>>>>> Ethernet connected @ 100M
>>>>>> Serial debug cable connected
>>>>>>
>>>>>> Table 4 is an analysis of the power consumption of the board in these
>>>>>> various scenarios.
>>>>>> Table 4. BeagleBone Black Power Consumption(mA@5V)
>>>>>>
>>>>>> MODE USB DC DC+USB
>>>>>> Reset TBD TBD TBD
>>>>>> Idling @ UBoot 210 210 210
>>>>>> Kernel Booting (Peak) 460 460 460
>>>>>> Kernel Idling 350 350 350
>>>>>> Kernel Idling Display Blank 280 280 280
>>>>>> Loading a Webpage 430 430 430
>>>>>> The current will fluctuate as various activates occur, such as the
>>>>>> LEDs on and
>>>>>> uSD/eMMC accesses.
>>>>>>
>>>>>>
>>>>>> On Tue, May 14, 2013 at 3:19 PM, <[email protected]> wrote:
>>>>>>
>>>>>>>
>>>>>>> I am trying to reach the lowest possible power consumption with a
>>>>>>> headless
>>>>>>> system, and only ssh access.
>>>>>>>
>>>>>>> I am running the included Linux kernel on the Beaglebone Black.
>>>>>>> Using the OnDemand
>>>>>>> governor. I notice that power usage does drop without a monitor
>>>>>>> connected, but is there
>>>>>>> a way to more fully disable video or other non-essentials to further
>>>>>>> reduce the power
>>>>>>> consumption?
>>>>>>>
>>>>>>> Thanks.
>>>>>>>
>>>>>>> --
>>>>>>> For more options, visit http://beagleboard.org/discuss
>>>>>>> ---
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>>>>>>> Groups "BeagleBoard" group.
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>>>>>>> send an email to [email protected].
>>>>>>>
>>>>>>> For more options, visit https://groups.google.com/groups/opt_out.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>> --
>>>>> For more options, visit http://beagleboard.org/discuss
>>>>> ---
>>>>> You received this message because you are subscribed to the Google
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>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Gerald
>>>>
>>>> [email protected]
>>>> [email protected]
>>>> http://beagleboard.org/
>>>> http://circuitco.com/support/
>>>>
>>> --
>>> For more options, visit http://beagleboard.org/discuss
>>> ---
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>>>
>>>
>>>
>>
>>
>>
>> --
>> Gerald
>>
>> [email protected]
>> [email protected]
>> http://beagleboard.org/
>> http://circuitco.com/support/
>>
>
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