Problem with programming wt51822-s4at

[IgorRus]

Hello,

I'm trying to flash wt51822-s4at using nrf52dk (https://4tronix.co.uk/picobot2/WT51822-S4AT.pdf)

It has nrf51822 chip on board

The firmware goes through without problems, but the device is not found using nrfConnect

The scheme is taken from https://devzone.nordicsemi.com/f/nordic-q-a/14058/external-programming-using-nrf52-dk

I use nrf51_SDK_12.3.0, Softdevice s130 and example ble_app_uart in Keil from SDK

With direct flashing of nrf52dk there is no such problem

[Sepehr1989]

I found.

it doesn't have any external LF Crystal, so you should using NRF_CLOCK_LFCLKSRC_SYNTH_250_PPM insted of NRF_CLOCK_LFCLKSRC_XTAL_20_PPM.

[IgorRus]

Oh, thank you very much! Now it works

[Sepehr1989]

but for central board still it has problem.

peripheral boards unable to connect to central board.

have you this problem too?

[IgorRus]

No, I try two options: nRF52-DK - central, wt51822 - peripheral and nRF52-DK - peripheral, wt51822 - central

Both options work well

[Sepehr1989]

but why central not working for me?

could i have your central program to test on mine?