NRF52 S132 v2 sd_softdevice_enable reset

[Sergy]

Hi,

my device resets on executing sd_softdevice_enable(p_clock_lf_cfg, softdevice_fault_handler);

I have external 32KHZ crystal. I also know that software works because one of 2 boards swork correctly, so something is wrong on the second one. But what?

I also checked LFCLK by manually starting it and it worked fine:

NRF_CLOCK->LFCLKSRC            = (CLOCK_LFCLKSRC_SRC_RC << CLOCK_LFCLKSRC_SRC_Pos);
NRF_CLOCK->EVENTS_LFCLKSTARTED = 0;
NRF_CLOCK->TASKS_LFCLKSTART    = 1;

while (NRF_CLOCK->EVENTS_LFCLKSTARTED == 0)
{
    // Do nothing.
}

All voltages are correct. Where should I look? Thanks!

[Anders Strand]

Try to find out the error code returned by sd_softdevice_enable. See this

[Sergy]

Thanks Anders that helped!

It seems like a problem with UART, indicating error_code 0x0C and the line is the following:

 case APP_UART_COMMUNICATION_ERROR:
            APP_ERROR_HANDLER(p_event->data.error_communication);

its from the ble_app_uart example. On RX I have data coming from GPS module at 9600baud, not sure why do I get an error?

[Anders Strand]

Do you have a logic analyzer? If not you should probably get one, like this one from saleae. What are you doing on uart? have you removed the part of the example code that will send anything received on BLE out on uart? Does the GPS module support flow control on uart?