How to measure two wave delay?

RE: How to measure two wave delay?

Mon, 30 Oct 2017 02:03:21 GMT

Thank you very much Jorgen! I have managed to solve this problem! But another problem has arisen...

I am trying to add this code that you sent me with the code "Bluetooth low energy Characteristics, a beginner's tutorial", but the functions "gpiote_init ()" and "timer_init ()" are conflicting with bluetooth transmission.

Could you please take a look at this other question that I asked on the Nordic Developer Zone and help me please to find the error?

The other question is: link text

RE: How to measure two wave delay?

Jørgen Holmefjord — Tue, 24 Oct 2017 09:37:25 GMT

Try debugging to see which function is returning non-zero error code.

RE: How to measure two wave delay?

Mon, 23 Oct 2017 22:21:53 GMT

Thank you very much again!!!! The sdk 11 version is compiling and it sends data to the log. It crashes after some time though.. it’s not sending data continuously as the sdk 12 version did. How could I correct it?

RE: How to measure two wave delay?

Jørgen Holmefjord — Mon, 23 Oct 2017 13:12:12 GMT

Updated above answer with SDK 11 version. Note that only Keil project is updated with correct files.

RE: How to measure two wave delay?

Sat, 21 Oct 2017 19:55:42 GMT

Hi Jørgen, Could you help me please with another thing? The code you sent me as an example uses the version of SDK 12.3, but I need it in version 11. How can I do this? Can you send me the same example in version 11 of SDK, please?!

Thank you Best wishes, B.

RE: How to measure two wave delay?

Mon, 09 Oct 2017 19:51:37 GMT

Thank you very much!

RE: How to measure two wave delay?

Jørgen Holmefjord — Wed, 04 Oct 2017 07:29:13 GMT

You send it the way described in the links I posted above. I do not know how you receive the values in app inventor or android studio, as I have never used either of those. You should ask that question on the support portals for those development tools.

RE: How to measure two wave delay?

Mon, 02 Oct 2017 18:54:15 GMT

Hi Jorgen, How do I send those values that are leaving the terminal to a mobile application using the app inventor, or android studio?! I do not know how to do this. How would the microcontroller code? Could you help me by sending an example please?!

RE: How to measure two wave delay?

Tue, 15 Aug 2017 12:52:04 GMT

Thanks a lot! I'm using this microcontroller a little time so I have difficulties.

RE: How to measure two wave delay?

Jørgen Holmefjord — Tue, 15 Aug 2017 12:40:48 GMT

You can store the measured delay any way you want, in variables, write it to flash, or send it over BLE using Nordic UART service or custom BLE service.

RE: How to measure two wave delay?

Tue, 15 Aug 2017 12:35:41 GMT

In the microcontroller registers. it's possible? Because I want to send these measurements by Bluetooth to a mobile How can I do this?

RE: How to measure two wave delay?

Jørgen Holmefjord — Tue, 15 Aug 2017 06:32:04 GMT

What registers?

RE: How to measure two wave delay?

Tue, 15 Aug 2017 04:09:20 GMT

Assuming there are different measured delay values. How do I store them in the registers?

RE: How to measure two wave delay?

Jørgen Holmefjord — Tue, 11 Jul 2017 12:29:30 GMT

You can use PWM with a duty cycle of 50% to generate a square wave. There is PWM driver and library example in our SDK. The rest of your request should be achievable using the code I posted in my answer above.

RE: How to measure two wave delay?

Mon, 10 Jul 2017 14:19:44 GMT

Hi! Thank you very much for your answer. It helped a lot! But I have another question, could you help me please? I want the microcontroller to generate a square wave, this wave will go through an RC (external circuit), and then the microcontroller will measure the delay between them (the delay between the generated wave and that same wave passing through the RC), how can I do that? Could you send me a code as an example?!

Best regards, B

RE: How to measure two wave delay?

Jørgen Holmefjord — Thu, 06 Jul 2017 15:23:11 GMT

Hi,

If you are willing to use two extra GPIO ports, I think it should be possible to achieve what you want by using GPIOTE, PPI and TIMERS.

Connect the output pins to two new input pins that are configured to sense rising edge of a signal using GPIOTE. Use PPI channels to connect the sensing event of one input pins to the start task of a timer, and the sensing event of the second input pin to the stop and capture task of the timer allows you to measure the delay between the rising edge of the two output pins.

I have created an example showing how this can be achieved using the drivers in SDK 12.3. Note that you have to connect PIN_OUT_1 to PIN_IN_1 and PIN_OUT_2 to PIN_IN_2 using cables. The timer runs at at 16 MHz, and the result reported is number of ticks. To convert it to seconds you can divide by 16000000. Let me know if anything is unclear.

delay_between_pin_rise.zip (SDK12.3.0)

delay_between_pin_rise_sdk11.zip

Best regards,

Jørgen

RE: How to measure two wave delay?

Thu, 06 Jul 2017 12:11:49 GMT

Yes!! I wanted to see some example code that measured the delay between two square waves. I do not know how to do this. Could you help me please?!

RE: How to measure two wave delay?

Jørgen Holmefjord — Thu, 06 Jul 2017 11:56:33 GMT

Are you using nRF51?

RE: How to measure two wave delay?

endnode — Thu, 06 Jul 2017 10:04:01 GMT

Why would you do it? Even if MCU would do this for you there will be jitter caused by clock cycles needed to perform the instructions so it will be inaccurate. And what kind of "command" you expect? You think that ARM Cortex-M MCU worth 1~2USD in big volumes is running some fancy OS which allows you to communicate with it in "commands"?:) To do ANYTHING with such deeply embedded system YOU need to develop FW (it's kind of misleading to speak about OS;), load it to it and then use interfaces and protocols you've implemented in your FW source code.

RE: How to measure two wave delay?

Thu, 06 Jul 2017 00:48:44 GMT

Oh yes ... But I want the microcontroller itself to measure this delay between waves. It is possible? How can I do it? And which command should I use?

RE: How to measure two wave delay?

endnode — Wed, 05 Jul 2017 20:42:30 GMT

Attach oscilloscope or logical analyzer to both PINs and then see time difference directly on time axis.