Custom board NRF52832 blinking LED using NRF52-DK P20

RE: Custom board NRF52832 blinking LED using NRF52-DK P20

Alanarf — Thu, 23 Apr 2020 11:38:49 GMT

Hi Simonr,

so, the problem was that my LED was inverted polarity.

But what is important about this ticket and the answers you gave me;

1. When using DK board (i am using pca10040) for SWD, the DK board will always be defined as the board

[quote userid="75734" url="~/f/nordic-q-a/60421/custom-board-nrf52832-blinking-led-using-nrf52-dk-p20/245696"]pca10040.h is likely chosen because you're using the chip on the DK which checks the BOARD_PCA10040) define in boards.h and uses the pca10040.h header file instead of your custom_board.h.[/quote]

So any changes, if needed, should be done in the pca10040.h.

2. The connection pinout
This is the connection that i used, powering my board externally:

3. My custom design considered external LF clock oscillators, so i didn't need to modify the sdk_config.h

Thats it, thanks a lot Simonr!

Alanarf

RE: Custom board NRF52832 blinking LED using NRF52-DK P20

Simonr — Thu, 23 Apr 2020 10:56:21 GMT

Please try powering the board using the VDD from the DK when you program it. It will provide 3.0V, not 5V, so you should be good in that regard. I think the interface MCU needs to detect the supply voltage of the board in order to program and debug the chip on the external board.

If you're still struggling, please upload the full schematics and layout of your board so I can take a look to see if everything looks right HW-wise.

Best regards,

Simon

RE: Custom board NRF52832 blinking LED using NRF52-DK P20

Alanarf — Thu, 23 Apr 2020 08:16:21 GMT

Hi Simonr,

[quote userid="75734" url="~/f/nordic-q-a/60421/custom-board-nrf52832-blinking-led-using-nrf52-dk-p20/246161"]\nRF5_SDK_XXXX\examples\peripheral\blinky[/quote]

Yes, this is the path of the project that i am running. I didn't make any other changes in the file.

RE: Custom board NRF52832 blinking LED using NRF52-DK P20

Simonr — Thu, 23 Apr 2020 07:36:38 GMT

Please confirm that your project is based on the example \nRF5_SDK_XXXX\examples\peripheral\blinky. If so, your device should toggle all the defined LEDs on your device. Have you made any other changes to the example other than the LED defines?

Best regards,

Simon

RE: Custom board NRF52832 blinking LED using NRF52-DK P20

Alanarf — Wed, 22 Apr 2020 08:05:50 GMT

[quote userid="89333" url="~/f/nordic-q-a/60421/custom-board-nrf52832-blinking-led-using-nrf52-dk-p20/245964"]#define LED_3 11[/quote]

Actually i changed LED_3 as you can see, but again, nothing happened =/

RE: Custom board NRF52832 blinking LED using NRF52-DK P20

Alanarf — Wed, 22 Apr 2020 08:03:28 GMT

Hi Simonr,

[quote userid="75734" url="~/f/nordic-q-a/60421/custom-board-nrf52832-blinking-led-using-nrf52-dk-p20/245696"]Have you configured the blinky example to use P0.11 instead of the LEDs configured in pca10040.h (P0.17-P0.20)?[/quote]

I believe you are referring to these lines of pca10040.h right?

// LEDs definitions for PCA10040
#define LEDS_NUMBER 4

#define LED_START 17
#define LED_1 17
#define LED_2 18
#define LED_3 11
#define LED_4 20
#define LED_STOP 20

I changed LED_1 to 11, nothing happened on my board.

[quote userid="75734" url="~/f/nordic-q-a/60421/custom-board-nrf52832-blinking-led-using-nrf52-dk-p20/245696"]pca10040.h is likely chosen because you're using the chip on the DK[/quote]

Yeah, it makes sense hehe. 🙂

[quote userid="75734" url="~/f/nordic-q-a/60421/custom-board-nrf52832-blinking-led-using-nrf52-dk-p20/245696"]Can you show me how your board custom board is connected to the NRF52DK debugger?[/quote]

I am using this configuration, except that i am not shorting VDD and VTG, I am just using VTG. Couse, i am using external supply for my board, and i read that shorting it will make the DK power my board, but with 5V, and i need 3.3V.

Thanks again!

RE: Custom board NRF52832 blinking LED using NRF52-DK P20

Simonr — Tue, 21 Apr 2020 06:20:52 GMT

Yes, I was aiming at the crystals, but they seem to be okay indeed. Thank you for the update.

Have you configured the blinky example to use P0.11 instead of the LEDs configured in pca10040.h (P0.17-P0.20)? pca10040.h is likely chosen because you're using the chip on the DK which checks the BOARD_PCA10040) define in boards.h and uses the pca10040.h header file instead of your custom_board.h.

Can you show me how your board custom board is connected to the NRF52DK debugger? Please use the picture below as reference when connecting your custom board to a DK's debugger.

Best regards,

Simon

RE: Custom board NRF52832 blinking LED using NRF52-DK P20

Alanarf — Mon, 20 Apr 2020 13:25:20 GMT

Hi Simonr,

thanks for answer.

You mean the crystalls?The design includes two crystal oscillators, the 32.7 KHz and 32 MHz. I basically followed the circuit bellow.

RE: Custom board NRF52832 blinking LED using NRF52-DK P20

Simonr — Mon, 20 Apr 2020 12:53:25 GMT

Hi Alanarf

Does your custom design include an external LF clock? If not, you'll need to modify the sdk_config.h file to use the internal LFRC oscillator instead by changing the following defines:

// <h> Clock - SoftDevice clock configuration

//==========================================================
// <o> NRF_SDH_CLOCK_LF_SRC  - SoftDevice clock source.
 
// <0=> NRF_CLOCK_LF_SRC_RC 
// <1=> NRF_CLOCK_LF_SRC_XTAL 
// <2=> NRF_CLOCK_LF_SRC_SYNTH 

#ifndef NRF_SDH_CLOCK_LF_SRC
#define NRF_SDH_CLOCK_LF_SRC 0
#endif

// <o> NRF_SDH_CLOCK_LF_RC_CTIV - SoftDevice calibration timer interval. 
#ifndef NRF_SDH_CLOCK_LF_RC_CTIV
#define NRF_SDH_CLOCK_LF_RC_CTIV 16
#endif

// <o> NRF_SDH_CLOCK_LF_RC_TEMP_CTIV - SoftDevice calibration timer interval under constant temperature. 
// <i> How often (in number of calibration intervals) the RC oscillator shall be calibrated
// <i>  if the temperature has not changed.

#ifndef NRF_SDH_CLOCK_LF_RC_TEMP_CTIV
#define NRF_SDH_CLOCK_LF_RC_TEMP_CTIV 2
#endif

// <o> NRF_SDH_CLOCK_LF_ACCURACY  - External clock accuracy used in the LL to compute timing.
 
// <0=> NRF_CLOCK_LF_ACCURACY_250_PPM 
// <1=> NRF_CLOCK_LF_ACCURACY_500_PPM 
// <2=> NRF_CLOCK_LF_ACCURACY_150_PPM 
// <3=> NRF_CLOCK_LF_ACCURACY_100_PPM 
// <4=> NRF_CLOCK_LF_ACCURACY_75_PPM 
// <5=> NRF_CLOCK_LF_ACCURACY_50_PPM 
// <6=> NRF_CLOCK_LF_ACCURACY_30_PPM 
// <7=> NRF_CLOCK_LF_ACCURACY_20_PPM 
// <8=> NRF_CLOCK_LF_ACCURACY_10_PPM 
// <9=> NRF_CLOCK_LF_ACCURACY_5_PPM 
// <10=> NRF_CLOCK_LF_ACCURACY_2_PPM 
// <11=> NRF_CLOCK_LF_ACCURACY_1_PPM 

#ifndef NRF_SDH_CLOCK_LF_ACCURACY
#define NRF_SDH_CLOCK_LF_ACCURACY 1
#endif

Best regards,

Simon