CC3220: How to set a timer based on the RTC?

V Velasco

Part Number: CC3220

I'd like to set a timer that uses the RTC so that it can wake the WiFi module up out of LPDS. What is the preferred way to do this? I've been using sleep() for timing purposes, but I don't see any solid indications that it uses the RTC instead of the high-speed clock.

over 7 years ago

0 made4engineering over 7 years ago

TI__Mastermind 27615 points

Hi Velasco,

Please refer to the power_measurement example in the SDK, for always connected mode. The timer for LPDS is always from the RTC, as the peripherals are off.

-Aaron

0 V Velasco over 7 years ago in reply to made4engineering

Prodigy 240 points

Thank you. I looked up the power measurement code, and the only timer that I saw that's invoked in the "always connected" mode is the usleep() function in wlanConnect(). I didn't think that this would use the RTC since the 32768 Hz clock can't provide microsecond resolution. Or does it automatically use the RTC in LPDS, with a corresponding loss of resolution?

0 made4engineering over 7 years ago in reply to V Velasco

TI__Mastermind 27615 points

This is done automatically :
Power_enablePolicy();
sleep(LPDS_IDLE_TIME/1000);

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CC3220: How to set a timer based on the RTC?