HFCLK timer issue

RE: HFCLK timer issue

haakonsh — Wed, 22 Sep 2021 12:16:35 GMT

I'm glad to hear you've solved the issue, don't hesitate to ask for support in the future :)

RE: HFCLK timer issue

sudharsan — Mon, 20 Sep 2021 11:56:52 GMT

Hi Haakonsh,

I have an option to turn on/off the LEDs which is connected ADPD sensor.

Now its doing well.

Thanks for your support. Take care

RE: HFCLK timer issue

haakonsh — Thu, 16 Sep 2021 10:28:36 GMT

Hey sudharsan, sry for the late response, i got sick with the flu last week :/

[quote user="sudharsan"]Max speed that we can set in controller side is of 400K right??[/quote]

Yes, you're right.

[quote user="sudharsan"]

RED on for 250 us (IR should be off) ----- complete off ----- IR on for 250us (RED should be off) ----- Both off ------ should continue in the same way.

Its not only switching but also I have to read the FIFO data from the sensor.

[/quote]

I don't think that is possible with a 400k TWI bus.

I suggest you scope the TWI bus and LEDs with a logical analyzer and verify what timings you are actually getting.

RE: HFCLK timer issue

sudharsan — Mon, 06 Sep 2021 11:14:17 GMT

I am using ADPD4101 sensor which is from Analog devices. I was not talking about the color of the LED. Its about fast processing.

I wish to switch RED and IR LEDs. I have sent you the while(1) block of code also.

Max speed that we can set in controller side is of 400K right?? SPI cannot be used as I have only I2C provision

RED on for 250 us (IR should be off) ----- complete off ----- IR on for 250us (RED should be off) ----- Both off ------ should continue in the same way.

Its not only switching but also I have to read the FIFO data from the sensor.

Please have a look at the below model pic.

RE: HFCLK timer issue

haakonsh — Mon, 06 Sep 2021 10:43:14 GMT

Yeah that can easily take a few millisecons, and it seems like that is a hard-limit for your use-case.

[quote user="sudharsan"]Should it be possible to see in naked eye ??[/quote]

The IR LED probably have some spectral components in the red color range. Or are you talking about the switching frequency?

What sensor are you using btw?

-EDIT:
I see you're using an ADPD410x of some kind, they seems to accept TWI speeds up to 1mbps and SPI speeds upt to 24mbps. At what speed is the TWI bus currently running on?

RE: HFCLK timer issue

sudharsan — Mon, 06 Sep 2021 10:19:59 GMT

This is not LED which is connected to GPIO. It is connected to HRM sensor where the enable/disable should be I2C write.

Please check the below

void EnableHRMLed(enum enable_led_t led_on)
{
     if(led_on == HR_RED_LED){
        switch_on_LED_1A_2A(&m_twi, ADPD410X_TS_A, ENABLE_HRLED_2A);
        cal_HR_red_enabled = true;
        cal_HR_ir_enabled = false;
     }
     else{
        switch_on_LED_1A_2A(&m_twi, ADPD410X_TS_B, ENABLE_HRLED_1A);
        cal_HR_red_enabled = false;
        cal_HR_ir_enabled = true;
     }
} 

void DisableHRMLed(void)
{
     switch_off_LEDs(&m_twi, PAIR_12, ADPD410X_TS_A); 
     switch_off_LEDs(&m_twi, PAIR_12, ADPD410X_TS_B);
}

RE: HFCLK timer issue

haakonsh — Mon, 06 Sep 2021 10:10:32 GMT

If it "works" now then it's an indication that the the functions DisableHRMLed() and EnableHRMLed() takes ~2600µs to execute. Can you share their implementation as well?

What I believe is happening is that there's a pending TIMER COMPARE interrupt when you exit the TIMER event handler, therefore you never return to your main loop.

[quote user="sudharsan"]

Please confirm...Is my timer initialization function definition right or ...??

Do I need to modify anything on timer side??

[/quote]

Your timer initialization seems okay to me. I think the issue lies in the LED toggling.

RE: HFCLK timer issue

sudharsan — Mon, 06 Sep 2021 09:31:10 GMT

Hi Haakonsh,

Please confirm...Is my timer initialization function definition right or ...??

Do I need to modify anything on timer side??

I have changed the timer callback. Now I am just setting the flag and reading it in while(1)

Now its fine and loop is also running...I have given 250us time-interval to switch the sensor's LED.

Sensor which is using I2C communication and speed - 400K

I am able to see the LED switching (RED <-> GREEN) ...Should it be possible to see in naked eye ??

This is where I am right now

/***************Enter main loop********************/
for (;;)
{   
        while (app_usbd_event_queue_process());
        process_usb_event();
         
#if defined(CMD_MODE) || defined(BLECMD_MODE)
        APPTASK_Handler();
#endif

#ifdef BLECMD_MODE
        BLE_PROCESS();
#endif

        if(timerenabled == 1)
        {
              if(is_HF_timer_started){
                  if(!cal_HR_ir_enabled)
                  {
                      //nrf_drv_timer_pause(&TIMER_LED);
                      DisableHRMLed();       //Disabling RED and Enabling IR
                      EnableHRMLed(HR_IR_LED);
                      //nrf_drv_timer_resume(&TIMER_LED);
                  }
                  else if(!cal_HR_red_enabled)
                  {
                      //nrf_drv_timer_pause(&TIMER_LED);
                      DisableHRMLed();       //Disabling IR and Enabling RED
                      EnableHRMLed(HR_RED_LED);
                      //nrf_drv_timer_resume(&TIMER_LED);
                  }
              }
              timerenabled = 0;
        }


#ifdef HRMEN
      HRM_Process();
      
#endif
        idle_state_handle();
}
/****************************************************************/




void timer_led_event_handler(nrf_timer_event_t event_type, void* p_context)
{
  switch (event_type)
  {
    case NRF_TIMER_EVENT_COMPARE3:
      timerenabled = 1;
      break;

    default:
    //Do nothing.
    break;
   }
}

Regards,

Sudharsan

RE: HFCLK timer issue

haakonsh — Mon, 06 Sep 2021 08:03:47 GMT

What's the execution time of the TIMER_LED's event handler?

And yes, TIMER0 is reserved for the SoftDevice.

RE: HFCLK timer issue

sudharsan — Fri, 03 Sep 2021 13:28:31 GMT

My source code contains softdevice also. We should not use Timer 0 right??? which is reserved for softdevice