nrf5280 re-config TRACEDATA pin as general gpio for pulse generation

[ziv123]

hello Nordic

i am using nrf52840, sdk 16.0, working base on the peripheral app_ble_blinky example

i wish to use the p0_11 pin for pulse generation (not pwm), but when i try to config that pin as nrf_drv_gpiote_out_init(), i get err_code = 8 (NRF_ERROR_INVALID_STATE )

i looked into the data sheet and the forum for a bit and understood this is TRACEDATA2 pin but that it can also be configured as gpio, so the question is how to reconfigure it as gpiote (timer will generate a pulse with ppi to this pin) ?

also, since i understood the TRACEDATA has something to do with debugging, does configuring the pin as gpiote will have any affect on debugging with development board or in the future with a programmer via j-link connection to a PCB to be ?

also, i am using TRACDATA 1 (p0_12) as MOSI pin in an SPI comm and i did not get any problem there, so why is there a difference ?

best regard

Ziv

[Vidar Berg]

Hello,

nrf_drv_gpiote_out_init() will return the invalid state error if you try to initialize a pin that has already been assigned, and P0.11 will be assigned as BUTTON_1/BSP_BUTTON_0 if you are using the default board configuration (See "Using the SDK with other boards").

Best regards,

Vidar

[ziv123]

hi Vidar

the problem is that if i change setting in the pca10056.h file then it will be changed for all other projects using that board, same if i add another custom board since i allready have one 

#elif defined(BOARD_CUSTOM)
  #include "bl652_sa_01.h"
  #include "audio_sticker.h"
#else
#error "Board is not defined"

i have 2 includes there

is there a way to corelate a specific board.h for each project ?

hope to read from you soon

best regards

Ziv

[Vidar Berg]

Hi Ziv,

You can just change the LEDBUTTON_BUTTON assigment in main.c to a different button.

Best regards,

Vidar

[ziv123]

hi Vidar

well i actually solved it differently eventually, changed the boards.h file like so:

elif defined (BOARD_D52DK1)
  #include "d52_starterkit.h"
#elif defined (BOARD_ARDUINO_PRIMO)
  #include "arduino_primo.h"
#elif defined (CUSTOM_BOARD_INC)
  #include STRINGIFY(CUSTOM_BOARD_INC.h)
#elif defined(REDENT_NOVA_BOARD)
  #include "bl652_sa_01.h"
#elif defined(AUDIO_STICKER_BOARD)
  #include "audio_sticker.h"
#else
#error "Board is not defined"

if you think it might cause some problems please inform

Best regards

Ziv

[Vidar Berg]

Hi Ziv,

It's perfectly ok to change board file as well. I don't see any problem with it.

Best regards,

Vidar

[ziv123]

hi Vidar

unfortunately my problems did not finish with this pin 

i had in my code the "button_init()" function left from the 'app_ble_blinky' example, when i comment it then for some reason when trying to config that pin (p0_11) i get an error 'NRFX_ERROR_INVALID_STATE' here:

nrfx_err_t nrfx_gpiote_out_init(nrfx_gpiote_pin_t                pin,
                                nrfx_gpiote_out_config_t const * p_config)
{
    NRFX_ASSERT(pin < NUMBER_OF_PINS);
    NRFX_ASSERT(m_cb.state == NRFX_DRV_STATE_INITIALIZED);
    NRFX_ASSERT(p_config);

    nrfx_err_t err_code = NRFX_SUCCESS;

    if (pin_in_use(pin))
    {
        err_code = NRFX_ERROR_INVALID_STATE;
    }

my pin configuration looks like that:

 // init pin task for ppi use:
    nrf_drv_gpiote_out_config_t pin_toggle_config = GPIOTE_CONFIG_OUT_TASK_TOGGLE(false);
    err_code = nrf_drv_gpiote_out_init(HYDRATION_FREQ_OUTPUT_PIN, &pin_toggle_config);
    APP_ERROR_CHECK(err_code);

any idea what i am doing wrong ?

in the "custom_board.h" file i commented all the build in defines with that pin

hope to read from you soon

best regards

Ziv

[Vidar Berg]

Hi Ziv,

The GPIOTE module must be initialized first with nrf_drv_gpiote_init() before you can assign the pin with nrfx_gpiote_out_init(). Have you done that?

Best regards,

Vidar