IWRL6432: LPDS in power modes example

Daniel

Part Number: IWRL6432

Tool/software:

Hi TI experts,

I slightly modified the power modes example in SDK 5.5.0.2 by changing the Threshold for LPDS from 30000000 to 20000 and adjusting SLEEP_TIME_TICKS from 50000 to 999. Then, I modified the idle task so that when the power modes example enters the LPDS use case and calls xSemaphoreTake(gPowerSem, SLEEP_TIME_TICKS);, the idle task prints out the value of xExpectedIdleTime.

What I don't understand is that when SLEEP_TIME_TICKS = 999, the value of xExpectedIdleTime is 999, and it doesn't enter LPDS. However, when SLEEP_TIME_TICKS = 1000, the value of xExpectedIdleTime is 1000, and it does enter LPDS. Why doesn't the system enter LPDS when SLEEP_TIME_TICKS = 999?

Best regards,
Daniel

5 months ago

+1 Abhishek Karkisaval 5 months ago

TI__Genius 9670 points

Thanks for your query. Please allow us a couple of days to respond.

Regards

+1 Abhishek Karkisaval 5 months ago in reply to Abhishek Karkisaval

TI__Genius 9670 points

Hi,

It might be due to a typecasting issue in vPortSuppressTicksAndSleep() in MMWAVE_L_SDK_05_05_00_02\source\kernel\freertos\dpl\common\power_xwrLx4xx_freertos.c

Please change idleTicks to

static volatile float idleTicks = 0;

It seems 999 is not correctly divided in function vPortSuppressTicksAndSleep().

Do note you will have to recompile the libraries

Regards

0 Daniel 5 months ago in reply to Abhishek Karkisaval

Prodigy 205 points

Hi Abhishek,

I resolved the issue by modifying the code time = ((idleTicks / configTICK_RATE_HZ) * 1000000); to time = ((idleTicks * 1000000) / configTICK_RATE_HZ);.

Regards,
Daniel

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IWRL6432: LPDS in power modes example