add timer in ble_app_uart

RE: add timer in ble_app_uart

Primož Kralj — Wed, 16 Dec 2015 09:11:22 GMT

yiran, could you post a working example now? I have the same problem as you did and I can't make sense of this code-mixing.

RE: add timer in ble_app_uart

yiran — Tue, 28 Jul 2015 07:57:13 GMT

Thank you! This problem has bored me several days

RE: add timer in ble_app_uart

Susheel Nuguru — Tue, 28 Jul 2015 07:54:14 GMT

you need to fix both, setpriority and also the compare event rest that you found.

RE: add timer in ble_app_uart

yiran — Tue, 28 Jul 2015 07:52:39 GMT

Yes, SetPriority also works , thank you very much!

RE: add timer in ble_app_uart

Susheel Nuguru — Tue, 28 Jul 2015 07:52:14 GMT

oh yes, that too.

RE: add timer in ble_app_uart

yiran — Tue, 28 Jul 2015 07:47:49 GMT

I find the cause...I should execute NRF_TIMER2->EVENTS_COMPARE[0] = 0; immediately when the time is up....

RE: add timer in ble_app_uart

Susheel Nuguru — Tue, 28 Jul 2015 07:46:35 GMT

you forgot to set the priority of Timer2 Irq handler

NRF_TIMER2->INTENSET = (TIMER_INTENSET_COMPARE0_Enabled << 
TIMER_INTENSET_COMPARE0_Pos);
NVIC_SetPriority(TIMER2_IRQn, NRF_APP_PRIORITY_LOW);
NVIC_EnableIRQ(TIMER2_IRQn);

RE: add timer in ble_app_uart

yiran — Tue, 28 Jul 2015 07:38:41 GMT

thank you for helping me so much ~my current problem is, before the connection is established, everything goes well, however when I start a timer when I connect to the dongle, and when the time is up, connection is lost before I terminate manually, and dongle doesn't go back to advertising mode.

RE: add timer in ble_app_uart

Susheel Nuguru — Tue, 28 Jul 2015 07:32:26 GMT

just before the for loop, i did not test connecting to the device. I was just checking if the device logs are coming to the terminal or not. I will see now what happens when We try to connect to it.

RE: add timer in ble_app_uart

yiran — Tue, 28 Jul 2015 07:20:53 GMT

where did you add 'time is up'? In my side application advertises well at the beginning, and it only crush after a little while when I connect to it. I start the timer when I connected to the dongle, it my crush when time is up.

RE: add timer in ble_app_uart

yiran — Tue, 28 Jul 2015 06:50:02 GMT

No, it is also stucked. I put a printf command in main

for (;;)
{
		printf("b");
    power_manage();
}

It continued outputting 'b' before the device is connected.My current complete code is here github.com/.../main.c

RE: add timer in ble_app_uart

Susheel Nuguru — Tue, 28 Jul 2015 05:56:37 GMT

Is the printf working from main? if yes, there seems to be some problem with your UART configuration , disable everything and see if the printfs are working from the main context.

RE: add timer in ble_app_uart

yiran — Tue, 28 Jul 2015 01:11:35 GMT

it stucks in the place printf("atime\n");, where it just print out one letter 'a'.

RE: add timer in ble_app_uart

Susheel Nuguru — Mon, 27 Jul 2015 09:57:36 GMT

sounds like the UART is stuck, comment the printfs out and see if it continues. UART log are too slow to be used in interrupt handlers.

RE: add timer in ble_app_uart

yiran — Mon, 27 Jul 2015 09:32:57 GMT

Fine. Now I tried to integrate the timer to my current work. I start the timer

case BLE_GAP_EVT_CONNECTED:
					//nrf_drv_timer_enable(&TIMER_LED);
        err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
        APP_ERROR_CHECK(err_code);
        m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;break;
					printf("%s","Device Connected:");
					
					NRF_TIMER2->TASKS_START = 1;

but TIMER2_IRQHandler is blocked when it is called....

void TIMER2_IRQHandler(void)
{
	//printf("atime\n");
	if (NRF_TIMER2->EVENTS_COMPARE[0] != 0 )
		printf("time is up");
		if ( !is_received_data)
			{
				printf("no data");

In the terminal it prints out 't' as the begining of "time is up", then stacked here. LED indicates it is still in connected mode, but in UART app I cannot disconnect from it.

RE: add timer in ble_app_uart

Susheel Nuguru — Mon, 27 Jul 2015 08:03:46 GMT

There is only 16 bit max supported by TIMER2 And select the prescaler to be 11. Then put 0X9896 in 16 bit CC register which will fit.

RE: add timer in ble_app_uart

yiran — Mon, 27 Jul 2015 07:50:24 GMT

I found another problem...No matter how I set the NRF_TIMER2->CC[0], the actual interval would not change unless I change the value of PRESCALER. Now I set NRF_TIMER2->PRESCALER = 4;, NRF_TIMER2->CC[0] = 5000*1000; NRF_TIMER2->BITMODE = TIMER_BITMODE_BITMODE_32Bit;, the actual interval is 100ms approximately, while it should be 5 seconds.

RE: add timer in ble_app_uart

Susheel Nuguru — Mon, 27 Jul 2015 06:16:19 GMT

if you want an event for 5 seconds, then you can even choose PRESCALER to be 4. Lower value of prescaler is for applications that need events in few milliseconds, precision gets very important then.

RE: add timer in ble_app_uart

yiran — Mon, 27 Jul 2015 02:09:15 GMT

I have got one here devzone.nordicsemi.com/.../ ~thx

RE: add timer in ble_app_uart

yiran — Mon, 27 Jul 2015 01:43:29 GMT

So I need to customize a prescaler for TIMER 1 or 2? Where can I get a sample code of it？ I tried to find one but most of them are discrete code...

RE: add timer in ble_app_uart

Susheel Nuguru — Fri, 24 Jul 2015 08:25:39 GMT

YES, apps can use TIMER1 and TIMER2 if softdevice is used (use can use timer0 if using timeslots, but dont get yourself confused with that) change the prescaler to something like 4, its a 16-bit timer, 10 seconds does not fit in CC with prescaler 0.

RE: add timer in ble_app_uart

yiran — Fri, 24 Jul 2015 07:50:24 GMT

Thank you very much. So any code relates to TIMER0 should be TIMER1? I have modified my code as you suggested, and set timer as 10000ms. Then program execute to case NRF_TIMER_EVENT_COMPARE1 immediately after the phone connect to 51822, rather than waiting 10 seconds.

RE: add timer in ble_app_uart

Susheel Nuguru — Fri, 24 Jul 2015 06:58:02 GMT

OK, found the problem, you cannot use TIMER0 as it is reserved by softdevice. Please read the softdevice reference manual. In old softdevices this would have hardfaulted, but since the newer version does not write anything to UICR.CLENR0, the hardware protection is not enabled. So it is upto users to understand which peripherals are used by softdevice and not touch them. In your code , change

const nrf_drv_timer_t TIMER_LED = NRF_DRV_TIMER_INSTANCE(0);

const nrf_drv_timer_t TIMER_LED = NRF_DRV_TIMER_INSTANCE(1);

RE: add timer in ble_app_uart

Susheel Nuguru — Fri, 24 Jul 2015 06:39:25 GMT

I will check your code later, common mistake when starting app_timer, have you increased APP_TIMER_MAX_TIMERS ? this needs to be done to allocate buffers for it.

RE: add timer in ble_app_uart

yiran — Fri, 24 Jul 2015 02:14:35 GMT

Thanks for your help. After fixing the problem you mentioned above, my application can start properly. However when I enable nrf_drv_timer_enable(&TIMER_LED);, mobile phone still disconnect once it connects to the 51822. My whole code is here github.com/.../main.c