Can program Custom NRF52832 board but Not Running

[hosiminh]

i have a custom NRF52832 board.

it have a 32mHz crystal but have not 32kHz crystal.

i use keil Uvision for programming, compile and burn the chip.

i use this example:

nRF5_SDK_11.0.0_89a8197\examples\ble_peripheral\ble_app_beacon\pca10040\s132\arm4

and i can load this example to my ble module.

but the module doesnt work.

i thought it can be about oscillator configurations and i tried my variants but it didnt work.

 

this is schematic:

and this my clock configurations;

#define NRF_CLOCK_LFCLKSRC {.source = NRF_CLOCK_LF_SRC_RC, \
                                                          .rc_ctiv = 16, \
                                                          .rc_temp_ctiv = 2, \
                                                          .xtal_accuracy = NRF_CLOCK_LF_XTAL_ACCURACY_20_PPM}

[Andreas]

Hi,

 

You should configure 250ppm or 500ppm accuracy at least.

 

I still have some concerns about the 32 MHz crystal, is it correctly loaded? I can not see any load capacitors. Are you able to see any radio activity at all, e.g. by measuring current?

 

Also, are you certain that you have loaded the Softdevice?

 

Best regards,

Andreas

[Nisubaba]

i have also face the same issue. but my ble advertise fine but can not send the data.

[Einar Thorsrud]

Hi,

Based on what you write it seems likely that the LF oscillator is less accurate then configured, then. So you should both check your HW (if using 32.768 kHz xtal) and SW configuration, particularly ensure that NRF_SDH_CLOCK_LF_ACCURACY is set to 1 in sdk_config.h if using LFRC.