RTC hardware time server is not working

[vd_it]

I am building ble application on stm32wb and below is the RTC configuration via cubemx.

I am trying to implement a scan timeout using the timeserver. Basically, I start a scan procedure and continue scanning until the time-out callback is invoked which terminates the scan procedure. However, for some reason, the timeout callback is never invoked. Below is my API usage.

/**
 * @brief callback to timeout if dut wasn't found
 */
static void scan_timeout_cb(void) {
 printf("ble: scan timed out\r\n");
 
 // terminate the scan procedure
 aci_gap_terminate_gap_proc(GAP_GENERAL_DISCOVERY_PROC);
}
 
static struct {
 uint32_t process_id;
 uint8_t id;
 HW_TS_Mode_t mode;
 HW_TS_pTimerCb_t cb;
 bool created;
} scan_timer = { .process_id = 0, .mode = hw_ts_SingleShot, .cb = scan_timeout_cb, .created = false };
 
 // create a timer
 if (!scan_timer.created) {
 HW_TS_ReturnStatus_t tmr_ret
 = HW_TS_Create(scan_timer.process_id, &scan_timer.id, scan_timer.mode, scan_timer.cb);
 if (tmr_ret != hw_ts_Successful) {
 	break;
 }
 }
 
 scan_timer.created = true;
 HW_TS_Start(scan_timer.id, 1);
 

I'd expect the "scan_timeout_cb" to be invoked immediately but that doesn't happen. Could someone please advise me on what I may be doing wrong?

[Piranha]

Maybe first learn how to use that time server API, not just invent something absurd?

https://community.st.com/s/question/0D50X0000CBlCxjSQF/using-the-sequencer-and-timer-server-on-p2pserver-example-150-hardfaults

[vd_it]

I don't see what's done any differently in the link you have shared. He's used HW_TS_Create to create a repeating timer to invoke QueueStandbyMode on timeout. HW_TS_Create gives the timer id that can be used to reference the timer when starting or stopping it. Then he starts the timer using HW_TS_Start to invoke QueueStandbyMode once every 5 seconds. I am doing exactly the same except that I use a single shot timer. Could you please point out what's it that you see I am doing wrong?

Also, seems like someone else was having the same issue but the question was never answered.

https://community.st.com/s/question/0D50X0000AmlSq6SQE/stm32wb-about-virtual-timer-and-callback-function

[vd_it]

Alright, I figured out why the callback wasn't being invoked. The HW_TS_RTC_Int_AppNot needs to be user-defined that invokes the registered callbacks when expired. @Piranha​, I am still wondering what you found so absurd regarding my API usage and curious about my invention? Never mind:D

[Piranha]

Initially it seemed to me that the first parameter of the HW_TS_Create() call should be some special CFG_TIM_PROC_ID_ISR, not a zero. Like some ID of a process, which services the timers. Now, searching for mode code, it seems that it's just a custom argument for arbitrary use. Sorry for causing an excessive stress! ;)