WiFi Power Consumption

Allen Lukowitz65

Other Parts Discussed in Thread: CC3200

We are trying to get the WiFi module to turn off when we go into Deep Sleep mode. We use the ConfigureSimpleLinkToDefaultState() routine that was provided with the example code to initialize the WiFi module. We then do an sl_Start(), sl_WlanConnect(), receive data from the module, and then do an sl_Stop. After the sl_Stop we are drawing ~19 mA and after entering deep sleep mode we are at ~14.5 mA. When we do not start the WiFi module we are at 15-16 mA before entering deep sleep, when in deep sleep we go down to 7.5 mA. Why don’t we go back to 15-16 mA after the sl_Stop() is executed? Why don’t we go down to 7.5mA in Deep Sleep Mode?

Thank you

over 10 years ago

0 Siddaram Mathapathi over 10 years ago

TI__Expert 5660 points

Hi Allen,

We will get back to you with a response soon.

Thanks and Regards,
Siddaram

0 Siddaram Mathapathi over 10 years ago in reply to Siddaram Mathapathi

TI__Expert 5660 points

Hi Allen,

In the link below you can find detailed steps to make current measurements, Please see if this helps
processors.wiki.ti.com/.../CC3200_Current_Measurements

Thanks and Regards,
Siddaram

0 Allen Lukowitz65 over 10 years ago in reply to Siddaram Mathapathi

Prodigy 250 points

Thank you for responding Siddaram,

I am not having a problem measuring the current, I am having a problem with the WiFi module not seeming to shut down completely.

thank you

al

0 Siddaram Mathapathi over 10 years ago in reply to Allen Lukowitz65

TI__Expert 5660 points

Hi Allen,

Please share details regarding what is the example that you are using to make these current measurements. Please find below the observations we usually make, can you also share the same so that we should be able to review them.
1. Turn on CC3200
2. Measured current should be ~ 15-16 ma
3. Make MCU enter LPDS, Measured current should be ~ 8-10 ma
4. Make a cc3200 board reset
5. Measured current should be ~ 15-16 ma
6. Do a sl_start, wlan_connect, sl_stop
7. Measured current should be ~ 14.25 ma
8. Make MCU enter LPDS, Measured current should be ~ 250 mciroamps

As mentioned above our observations contradict what you have observed. After a sl_start and sl_stop. Currents go down rather than up compared to currents measured without a sl_start and sl_stop. This is attributed to WLAN PD which by default is turned on after a reset and when we invoke a sl_start, sl_stop it gets turned off.

Thanks and Regards,
Siddaram

0 Allen Lukowitz65 over 10 years ago in reply to Siddaram Mathapathi

Prodigy 250 points

Hi Saddaram,

Thank you for replying. Is there any way we can get a copy of the code you are running to test the power consumption? After we execute the sl_stop our power consumption is just over 20 mA. In steps 3 and 8 are you putting the micro in low power deep sleep or deep sleep? Are you doing a transmission or just a connect? Are you dynamically creating tasks using VStartSimpleLinkSpawnTask and VDeleteSimpleLinkSpawnTask??

Thank you very much for your assistance.

al

0 Siddaram Mathapathi over 10 years ago in reply to Allen Lukowitz65

TI__Expert 5660 points

Hi Allen,

I think it's better we follow the steps given in the link below. It not only lists how to measure the current but also which example what code to use etc. To start with you can try Idle connected Mode.
processors.wiki.ti.com/.../CC3200_Current_Measurements

Thanks and Regards,
Siddaram

0 Rahul Goyal over 10 years ago

TI__Intellectual 1500 points

Hi Allen,

Can you make sure that Network subsystem is getting sufficient time to go down(typically, 30 ms is fine)?
please call sl_Stop with 30ms as argument and check if their is any improvement in the current numbers.

let me know if it helps.

Regards,
Rahul

0 Allen Lukowitz65 over 10 years ago in reply to Rahul Goyal

Prodigy 250 points

Hi Rahul,

I had a called Task_sleep(100); before attempting to go into the DSPS mode. It seems to use a lot less power if I call PRCMLPDSEnter(); WITHOUT doing a sl_Stop()??

Do you know how I can get the PC and SP for the PRCMLPDSRestoreInfoSet(unsigned long ulRestoreSP, unsigned long ulRestorePC); call??

thank you

0 Rahul Goyal over 10 years ago in reply to Allen Lukowitz65

TI__Intellectual 1500 points

Hi Allen,

I am not sure i understood your question correctly. But if you are calling sl_Stop(0), it will lead to a situation where you Network sub-system did not get a chance to go down gracefully and therefore will be consuming power. On the other hand if you do not call the sl_Stop, the Network sub-system will be cycling through low power modes and will consume less power.

Did you try calling sl_stop(30) before going into LPDS?If yes, did it help in bringing down the current numbers?

For your second question, PC will be the address of the function, which will be executed just after the system has come up from LPDS(by default, it is "resume_from_S3"). For SP, refer to the BACK_UP_ARM_REGISTERS function in cc_pm.c file (middleware).

Let me know if you need any more information.

Regards,
Rahul

0 Siddaram Mathapathi over 10 years ago in reply to Rahul Goyal

TI__Expert 5660 points

Hi Allen,

Did your queries got answered. If yes please press the "Verify Answer" button to close this thread.

Thanks and Regards,
Siddaram

0 Siddaram Mathapathi over 10 years ago in reply to Siddaram Mathapathi

TI__Expert 5660 points

Hi Allen,

I am closing this thread, if the issue still exists please open a new thread and add a link to this one for reference

Thanks and Regards,
Siddaram

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