Not able to run BLE when i configure any pin as input pin with PULLUP/PULLDOWN.

[Rajat]

Hi Everyone

I have the following issue in my application code.

If i configure a pin as an input pin , i am not able to run the ble init function in which it advertises.

If i comment out the input pin configuration, i am able to run the ble part of program and it sends data successfully to the nrfconnect App.

Here is the code that i am using,.

Am i using the correct method to configure the pin as an input pin.(nrf_gpio_cfg_input(1,NRF_GPIO_PIN_PULLDOWN)) ?

If not ,then what is the proper way to perform this action.

Thanks

Rajat!

int main(void)
{

nrf_gpio_cfg_input(1, NRF_GPIO_PIN_PULLDOWN);
ble_init();
while(1)
{
ble_send("hello");   /*This works perfectly if i comment the nrf_gpio_cfg_input line*/
}
}

[Håkon Alseth]

Hi,

 

Are you by any chance using the external 32k crystal configuration (which is the default configuration in our examples)?

If yes; try to avoid using P0.00 and P0.01, as the external 32k LFCLK uses those.

 

Best regards,

Håkon

[Rajat]

Thanks for sharing this information 

But i have tried this using P0.10 pin as well, still it gives me same results

What should i do next?

Thanks 

Rajat!

[Rajat]

Just got to know that 10 and 9 pins are default for NFC , so i am using P0.28 pin and tried . This did resolve my issue.

But i have another question.

I am using the same configuration p0.28 as BUSY pin for EPAPER display which uses the SPI protocol.

But its not working while it works if i configure the BUSY pin on 0 pin.

What can be the issue and is there something i am doing wrong

Here is a piece of code that i am using for EPAPER.

void ePaperInit(void)
{
//bsp_board_init(BSP_INIT_LEDS);
    //APP_ERROR_CHECK(NRF_LOG_INIT(NULL));
    //NRF_LOG_DEFAULT_BACKENDS_INIT();

//io init

nrf_gpio_cfg_output(CS_PIN );
nrf_gpio_cfg_output(EPAPER_DC);
nrf_gpio_cfg_output(EPAPER_RST);
nrf_gpio_cfg_input(EPAPER_BUSY, NRF_GPIO_PIN_PULLUP);   /*EPAPER BUSY =28*/
//nrf_gpio_pin_dir_set(EPAPER_BUSY,NRF_GPIO_PIN_DIR_INPUT);
nrf_gpio_cfg_output(LEDP);



// spi init


nrf_drv_spi_config_t spi_config = NRF_DRV_SPI_DEFAULT_CONFIG;
    spi_config.ss_pin   = SPI_SS_PIN;
  //  spi_config.miso_pin = SPI_MISO_PIN;
    spi_config.mosi_pin = SPI_MOSI_PIN;
    spi_config.sck_pin  = SPI_SCK_PIN;
 //   APP_ERROR_CHECK(nrf_drv_spi_init(&spi, &spi_config, spi_event_handler, NULL));
nrf_drv_spi_init(&spi, &spi_config, spi_event_handler, NULL);

nrf_gpio_pin_write(LEDP,0);
nrf_delay_ms(2000);

// off the led 1
nrf_gpio_pin_write(LEDP,1);

}

[Håkon Alseth]

Hi,

 

But its not working while it works if i configure the BUSY pin on 0 pin.

Are you using P0.28 for something else? This is normally used for the default SPI communication, and if you're not using the MISO pin, set it equal to "NRF_DRV_SPI_PIN_NOT_USED".

 

Best regards,

Håkon

 

[Rajat]

Hi Thanks ,It worked on P0.28 pin .

I will check if i could change the pins . :)