No Cortex-M SW Device Found after program softdevice

[ticture]

Hello, the chip I use is nrf52810 QCAA, when I use j-flash lite to earse the whole chip, it success, then I program the flash_s112_nrf52_7.2.0_softdevice into the chip by keil5, it also success, but when I program my code into chip, it failed and shows No Cortex-M SW Device Found. After that, I can't earse the whole chip by j-flash lite which shows "could not connect  to target" and I even can't program the flash_s112_nrf52_7.2.0_softdevice which shows No Cortex-M SW Device Found. what should I do, the example I use is nRF5_SDK_17.0.2_d674dde\examples\ble_peripheral\ble_app_hids_keyboard. Thank you!

[Simonr]

Hi again

The defines I mentioned (DEVELOP_IN_NRF52832 and NRFX_COREDEP_DELAY_US_LOOP_CYCLES) should be removed for any nRF52810 project to ensure proper operation. It might still work, but there are no guarantees that it will.

As for your schematic, this looks good, as long as you have edited the sdk_config.h to use the internal LFRC oscillator instead of the LFCLK used by default in our SDK examples. Please make sure that the following defines have these values in your sdk_config.h file.

// <h> Clock - SoftDevice clock configuration

//==========================================================
// <o> NRF_SDH_CLOCK_LF_SRC  - SoftDevice clock source.
 
// <0=> NRF_CLOCK_LF_SRC_RC 
// <1=> NRF_CLOCK_LF_SRC_XTAL 
// <2=> NRF_CLOCK_LF_SRC_SYNTH 

#ifndef NRF_SDH_CLOCK_LF_SRC
#define NRF_SDH_CLOCK_LF_SRC 0
#endif

// <o> NRF_SDH_CLOCK_LF_RC_CTIV - SoftDevice calibration timer interval. 
#ifndef NRF_SDH_CLOCK_LF_RC_CTIV
#define NRF_SDH_CLOCK_LF_RC_CTIV 16
#endif

// <o> NRF_SDH_CLOCK_LF_RC_TEMP_CTIV - SoftDevice calibration timer interval under constant temperature. 
// <i> How often (in number of calibration intervals) the RC oscillator shall be calibrated
// <i>  if the temperature has not changed.

#ifndef NRF_SDH_CLOCK_LF_RC_TEMP_CTIV
#define NRF_SDH_CLOCK_LF_RC_TEMP_CTIV 2
#endif

// <o> NRF_SDH_CLOCK_LF_ACCURACY  - External clock accuracy used in the LL to compute timing.
 
// <0=> NRF_CLOCK_LF_ACCURACY_250_PPM 
// <1=> NRF_CLOCK_LF_ACCURACY_500_PPM 
// <2=> NRF_CLOCK_LF_ACCURACY_150_PPM 
// <3=> NRF_CLOCK_LF_ACCURACY_100_PPM 
// <4=> NRF_CLOCK_LF_ACCURACY_75_PPM 
// <5=> NRF_CLOCK_LF_ACCURACY_50_PPM 
// <6=> NRF_CLOCK_LF_ACCURACY_30_PPM 
// <7=> NRF_CLOCK_LF_ACCURACY_20_PPM 
// <8=> NRF_CLOCK_LF_ACCURACY_10_PPM 
// <9=> NRF_CLOCK_LF_ACCURACY_5_PPM 
// <10=> NRF_CLOCK_LF_ACCURACY_2_PPM 
// <11=> NRF_CLOCK_LF_ACCURACY_1_PPM 

#ifndef NRF_SDH_CLOCK_LF_ACCURACY
#define NRF_SDH_CLOCK_LF_ACCURACY 1
#endif

Seems like the power supplied to the nRF is okay.

Best regards,

Simon

[ticture]

Thanks for your answer, I have already used the internal LFRC oscillator in my code, but I can't program or recover my custom board, what should I do?