What does NRF_BREAKPOINT_COND mean?

[Alice]

Hi,

I'm using nRF52810 with SDK 14.1 base on ble_app_uart example. But I meet a very strange problem. The project couldn't run after I program, no matter I use Keil or nRFgo to program. it runs to the NRF_BREAKPOINT_COND when I debug it. The project is OK before and I have not changed anything. What reason would lead to this problem? Thanks.

[sean]

I have the same trouble, too. What is the final solution?

[Alice]

I have solved it. There is a bug for the SDK. In the apply_config function in nrf_drv_uart.c document, need to change nrf_gpio_cfg_input(p_config->pselrxd, NRF_GPIO_PIN_NOPULL); to nrf_gpio_cfg_input(p_config->pselrxd, NRF_GPIO_PIN_PULLUP);,then it would be OK.

[Alaa]

Not working for me...

What occurrence of nrf_gpio_cfg_input() are you talking about? There are 3 inside apply_config(). I tried all of them but it didn't work. I still get NRF_BREAKPOINT_COND

[goce_mk]

I can confirm this. After changing NRF_GPIO_PIN_NOPULL to NRF_GPIO_PIN_PULLUP, and adding a 10k puill-up resistor to 3.3V on both Tx, and Rx pins, i can run the application. For some reason they must not be left floating. I am however, notr using uart in my application at all. I have had this problem only on a custom board, the same code is running fine on Red Bear Nano v2.

[Joakim Jakobsen]

Hi.

If the pins is not connected to anything, it will be left floating in the wind and pick up noise. The UART will then believe that the noise is actual data, but will not be able to make sense of it. This will in most cases generate an error.

Best regards.

[inghowe83]

Hi there, may I know which pin for nRF52840 chip should be connect to pull up? I also facing the same intermittent error here.

[Niteesh]

This works partially. I am using I2c pins and when I changed as you mentioned, I was able to run one iteration before it again ended up at NRF_BREAKPOINT_COND.