NRF52840-QFAA not able run blinky

[Dany]

Hi all, 

I develop my own IoT board using NRF52840-QFAA (Rev3), I am follow the Intermediated Course about Creating custom board but some how my board cannot run blinky example

Even I can download program to the chip, but do not see it work.

Attach is my schematic and dts for my custom board, I do not mount PA chip already, just create example code to test buttons, and LED connect to TX & RX Pins (because I design the test point for this)

drring1.zip

[Håkon Alseth]

Hi,

 

It looks like your design does not have a external 32k.

Could you try enabling the internal 32k RC oscillator?

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y

 

Kind regards,

Håkon

[Dany]

Hi, 

Thank you for your reply

Yep I find my board do not have 32k Crystal so I already put this config to the defconf file, but it's still not blink

I use multimeter and measure the voltage of the LED pin is fix 1.15V, not toggle. 

And I still stuck there for some days