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

[PriyeshN]

Hi Vidar,

I'm not using default board configuration and have my own custom board configuration. I'm also initializing the pin using nrf_gpio_cfg_output() as I'm not using events on that line. and this function does not return anything.

For further elaboration, I'm not getting any error while initializing the pin. Things go weird when I set the line to HIGH and if TRACE is not used, I don't see any reason for my code to jump to unknown location in memory and stuck there. 

Any thoughts you can share which can help me solve this.