nrf52840 zephyr boot failed

[kit j]

i build the zephyr samples/hello_world Demo ,and it can run and print well on BOARD_NRF52840DK_NRF52840.

but this hex file cannot boot up on my own board.

for simplest case, my own custom board only use 4 pins (SWC SWD GND VCC) from this www.aliexpress.com/wholesale

someone suggests set BOARD_ENABLE_DCDC=n but not work for me.

so i need some help

thx!

[kit j]

I can run other firmware(not zephyr baesd) on this board, so i think it has crystal

[Jared]

Hi there,

Can you try to change the LF clock source by adding this to your config file:

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_XTAL=n

regards

Jared

[kit j]

Sincerely thank you for your reply. 

I managed to run hello_world after setting RC=y XTAL=n.

I'm currently testing Gazell, so I'm still relying on XTAL. because there is no way to transmit 2.4G when XTAL=n. is there any way to test if XTAL is working properly? Because there is XTAL in board‘s schematic. It looks like my board is not working properly with external XTAL. 

[Jared]

Hi,

Can you share the schematic that shows that there is an onboard LFXO?

regards

Jared