application timer + pwm

RE: application timer + pwm

samo — Mon, 04 Dec 2017 18:03:52 GMT

Hi Sigurd,

I found out a problem. I have a problem with the hardware (buzzer). The software works fine. Sorry, but I did not know that this issue can cause the hardware. Thanks for help.

RE: application timer + pwm

Sigurd — Tue, 28 Nov 2017 16:03:23 GMT

Hi,

Note that you are not checking the return code when you are calling the function app_timer_start(). Please change this:

app_timer_start(m_buzzer_lpg_timer_id, BUZZER_INTERVAL,NULL);

uint32_t err_code;
err_code = app_timer_start(m_buzzer_lpg_timer_id, BUZZER_INTERVAL,NULL);	
APP_ERROR_CHECK(err_code);

So we can check if the app timer is actually starting, or if it's returning any error codes.

If you are getting NRF_SUCCESS , you could try to add the delay as explained here.

If you are still having problems after this, consider uploading the ble_lpgs.c and ble_lpgs.h files, and I could try to reproduce the issue here.

RE: application timer + pwm

samo — Mon, 27 Nov 2017 14:21:34 GMT

main.c

Hi Sigurd,

thanks for your reply. I transferred the critical part of the code in my original project into a template project and the main file is attached. As you can see I have two timers for battery acquisition and one timer for buzzer. To be clear I will explain this part little bit more in detail. When the user writes the number 2 in the actual characteristic (you will see that I have only one characteristic besides the battery one in my program) the PWM is generated. At the same time buzzer timer starts (app_timer_start(m_buzzer_lpg_timer_id, BUZZER_INTERVAL,NULL); ) which power on and off the periphery of the buzzer. In such a way I can get the PWM with on and off control.

I added a critical region in timer_list_handler() but I get the same fault. If I wait for one or two hours and then I send number 2 to the characteristic, the pwm signal is not generated. I am almost sure that the mentioned problem is not caused by the pwm library. The reason lies in the fact that if the timer (app_timer_start(m_buzzer_lpg_timer_id, BUZZER_INTERVAL,NULL) is not included in the code everything works fine. Please do not forget I am using SDK 10 and corresponding softdevice. I am wondering if the SDK 10 has some major errors regarding the application times.

Thanks for help in advance

Best regards

Samo

RE: application timer + pwm

Sigurd — Fri, 24 Nov 2017 15:02:54 GMT

Hi,

Could you post the code on how you create the app_timer ?
Is this a APP_TIMER_MODE_SINGLE_SHOT or a APP_TIMER_MODE_REPEATED timer?
is BUZZER_INTERVAL and BUZZER_START_200MS the same ?
What are you trying to do in the buzzer_lpg_timer_handler exactly?
What are you doing in ble_is_Buzzer_Busy_update()?
In the post you linked to, did you test Phil Beeson fix with adding CRITICAL_REGION_ENTER(); and CRITICAL_REGION_EXIT(); in timer_list_handler in app_timer.c?