Hello, I'm using the nRF51822_QFAA chip on a custom board, but the layout and parts are the same as on the nRF51822 USB dongle. I tried flashing the Board\pca10001\s110\ble_app_hrs program to my custom board, but the chip wasn't advertising, I tried scanning for devices on my Xperia Z2 tablet with the nRF Master Control Panel, but nothing showed up. I tried flashing the same program to the evaluation kit master board and also the dongle, still no advertising. So I started debugging the chip using Keil uVision 5.11.0.0 and a Segger J-Link Edu, setting a debug LED on when the code reached somewhere. Step-by-step I tracked that the code. The problems start in this function:
static void ble_stack_init(void)
{
uint32_t err_code;
// Initialize the SoftDevice handler module.
SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_RC_250_PPM_4000MS_CALIBRATION, false);
// SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_XTAL_250_PPM, false);
// Register with the SoftDevice handler module for BLE events.
err_code = softdevice_ble_evt_handler_set(ble_evt_dispatch);
APP_ERROR_CHECK(err_code);
// Register with the SoftDevice handler module for BLE events.
err_code = softdevice_sys_evt_handler_set(sys_evt_dispatch);
APP_ERROR_CHECK(err_code);
}
In ble_stack_init it calls
SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_RC_250_PPM_4000MS_CALIBRATION, false);
Which leads to the file softdevice_handler.c to the method
uint32_t softdevice_handler_init(nrf_clock_lfclksrc_t clock_source,
void * p_evt_buffer,
uint16_t evt_buffer_size,
softdevice_evt_schedule_func_t evt_schedule_func)
{
...
// Initialize SoftDevice.
err_code = sd_softdevice_enable(clock_source, softdevice_assertion_handler);
...
}
I have also tried running
SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, false);
as seen above in the ble_stack_init method and measured the external crystal to run perfectly at 32,7 kHz. Although, a funny thing here also, when I use the XTAL low frequency clock then the external 16 MHz crystal doesn't generate anything anymore, when i swap back to RC then the external 16 MHz crystal starts generating a perfect 15,999...16,000 MHz
Anyway, after it reaches
err_code = sd_softdevice_enable(clock_source, softdevice_assertion_handler);
it hangs in SVC_Handler. At the very beginning it got stuck at a HardFault, but somehow that problem went away and I don't even know how...
