can not run cdc_acm demo on my 52820 board

[Llama12580]

I have customed my own 52820 dongle board.

I wanted to run ncs2.7.0/zephyr/samples/subsys/usb/cdc_acm demo on my board to test whether it worked. So, I builit the cdc_acm demo with nrf52820dongle target and then burned the build/merged.hex into my 52820 dongle board.

However, when I plug in my 52820 usb dongle into my PC, it didn't show any usb device.

[Håkon Alseth]

Hi,

 

Does your custom dongle have 32k xtal and/or dcdc components present?

 

Can you try to set these two and see if it works now?

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y
CONFIG_BOARD_ENABLE_DCDC=n

 

Kind regards,

Håkon

[Llama12580]

Thank you.The Config 'CONFIG_BOARD_ENABLE_DCDC=n' is avaliable in ncs2.7.0.

But in ncs2.8.0, it seems not work. Does it abondoned in ncs2.8.0?

[Håkon Alseth]

Hi,

 

My apologies for not mentioning this.

This was moved from kconfig to dts, and can be set like this:

&reg1 {
        regulator-initial-mode = <NRF5X_REG_MODE_LDO>;
};

 

Kind regards,

Håkon