[Zigbee] Sleepy end device get out of sleep in approx 10 mins

Question

Hi everyone, 
 I have this question to ask. So I am trying do make an end device that run on low power. I can see that there is an example about the sleepy end device in the Zigbee and Thread SDK 4.1. So i try it and measure the current through the prolifier kit. Because i am running a NRF52833 on a custom board(just some with some io pins to use led and button), i run the code for PCA10100 on the light switch example. Then, I also modify some part of the code like delete the finding and binding part as well as pressing a button for the device to go sleepy but instead got sleepy automatically at startup. In addition, i also use the RTT log instead of the UART backend log.ut 
 When i first measure the power by the prolifier board version 1, it is get to 2.4uA on average, so good so far. But then, when i measure for a little longer like in 15 mins, the current start to go up to 80uA at 10-11mins i did not even start to commission the device to the coordinator. This is really weird since I keep like 90% of the code in the example. So, I have not modified any part of the code so that i can send it to you. Also, I try to not start the zigbee module and just run __WFE() and __SEV() in the main while(1) loop and it working just fine. So i have a wild guess that there are some thing need to be done in the zigbee configuration that i miss. 
 Please help and reply soon, I attach the code i make with this. 
 
 Test_lowpower.zip 
 Best regards, 
 Hoang Ngoc Tu

Marte Myrvold · Accepted Answer

Hi Tu, 
 This might be caused by the sleep period being longer than RTC overflow, as RTC overflow is 520 seconds, which is rather close to 10 minutes. Please try to make the following changes in external/zboss/osif/zb_nrf52_timer.c: 
 // In file: external/zboss/osif/zb_nrf52_timer.c
// make two changes
///////////////////////////////////////////
// Need this defines for later sleep period
// calculations.
// 
// Change this block:
#define ZB_NRF52_TIMER_VALUE 15360 /*microseconds in one beacon interval*/
// to this block:
#define ZB_NRF52_TIMER_VALUE 15360 /*microseconds in one beacon interval*/
#define MS_PER_S 1000UL /* Miliseconds in one second. */
#define RADIO_DRIVER_RTC_OVRFLW_S 512UL /* Time that has passed between overflow events. On full RTC speed, it occurs every 512 s. */
#define ZB_NRF52_MAX_SLEEP_PERIOD_MS ((RADIO_DRIVER_RTC_OVRFLW_S - 1) * MS_PER_S) /* Zigbee max sleep period to prevent RTC timer overflow. */
///////////////////////////////////////////
///////////////////////////////////////////
// Workaround for long zigbee sleep period.
// Sleep period longer than RTC overflow,
// results in very short sleep scheduled,
// waking up the CPU frequently.
// 
// Change this block:
m_timer.dt = 1000 * sleep_tmo;
// To this block:
/* Workaround for long zigbee sleep period.
 * Device wakes up on RTC event and scheduling sleep period
 * longer than RTC overflow (512 seconds) can result in very short sleep scheduled
 * whick wakes up CPU frequently and increases power consumptiom.
 */
m_timer.dt = 1000 * ((sleep_tmo > (ZB_NRF52_MAX_SLEEP_PERIOD_MS)) ? (ZB_NRF52_MAX_SLEEP_PERIOD_MS) : (sleep_tmo));
/////////////////////////////////////////// 
 Best regards, 
 Marte

[Zigbee] Sleepy end device get out of sleep in approx 10 mins

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