RTOS/CC1350: Inaccurate sleep time CC1310/CC1350

Part Number:CC1350

Tool/software: TI-RTOS

Hi,

I modified pinstandby code slightly and found something weird.

Basically I modified the code to be like:

sleep(7200);

PIN_setOutputValue(hPin, Board_PIN_LED1, 1);
sleep(100);
PIN_setOutputValue(hPin, Board_PIN_LED1, 0);

I did three test:

1. Let the board "sleep(7200)" and then blink the led for "sleep(850)" :

Result: The LED turned on after 48 min(*instead of 2 hours*) and correctly stayed for 850s

2. Try with "sleep(3600)" and then blink the led for "sleep(100)":

Result: The LED correctly turned on after 60 min and stayed for 100 s

3. Try with "sleep(3600)" then "sleep(3600)" then blink the led for "sleep(100)":

Result: The LED correctly turned on after 120 min and stayed for 100 s

Anyone knows what really happened here? why sleep(7200) does not work properly while sleep(3600) does? Same problem on CC1310 Lauchpad.

Thanks,

YOYO