RE: Reading current pulse train

Sigurd — Thu, 13 Feb 2020 15:11:18 GMT

Hi,

We can continue the discussion in the your other post.

RE: Reading current pulse train

Thomas — Wed, 05 Feb 2020 11:03:00 GMT

I've had a good look at the code you linked to but, I need to change the input from PIN_In to a comparator using an external reference. Where in your example do I make these changes. Thanks

RE: Reading current pulse train

Thomas — Tue, 04 Feb 2020 15:29:24 GMT

Also I cant find the pinout for the NRF52840-dk. I want to set the comparator output to the input of the counter timer. And give the comparator an external voltage reference to measure against. How do I setup this input? I have got the following code:

//Configuring lpcomp
    NRF_LPCOMP -> PSEL = (LPCOMP_PSEL_PSEL_AnalogInput2 << LPCOMP_PSEL_PSEL_Pos);//Use analog input 2 as an input P04
    NRF_LPCOMP -> EXTREFSEL = (LPCOMP_EXTREFSEL_EXTREFSEL_AnalogReference0 << LPCOMP_EXTREFSEL_EXTREFSEL_Pos);//Set up external reference 0 P02
    NRF_LPCOMP -> REFSEL = (LPCOMP_REFSEL_REFSEL_ARef << LPCOMP_REFSEL_REFSEL_Pos);//Use external reference
    NRF_LPCOMP -> ANADETECT = (LPCOMP_ANADETECT_ANADETECT_Cross << LPCOMP_ANADETECT_ANADETECT_Pos);//Detect a change over the reference upon crossing the reference
    
    //Enable and start the low power comparator
    NRF_LPCOMP -> ENABLE = LPCOMP_ENABLE_ENABLE_Enabled;
    NRF_LPCOMP -> TASKS_START = 1;

Are my comments of the pin connections for analog reference 0 and analog input 2 correct?

I got them from this pinout for a similar nordic dk : https://os.mbed.com/platforms/Nordic-nRF52-DK/

RE: Reading current pulse train

Sigurd — Mon, 03 Feb 2020 12:36:29 GMT

Hi,

I have some example code in this post. (The "gpiote_timer_ppi.zip" attachment in the post)