ld5 flashing quickly, board not visible, PCA10056 IF BOOT not work!

[Esmaeill]

Hello,

nRF52840 led 5 blinks continuously causing reset and not performing code properly.

I tried different USB cables but it still blinks. What could be the reason, is it only causing reset?

and what can be done to make it proper?

IF BOOT not work Button not working, when i push that on power up by usb.

The PC does not sense any hardware connection!

PCA10056 3.0.0 2022.36

by cell 3v battery , the main nrf52840 wort and led 1-4 blink slowly by pressing buttons. but how can I program that when the interface is not working and cant boot that for software updating?

[Esmaeill]

I change the Power source from usb to vdd and it work fine!

[Priyanka]

Glad to hear that you got it to work

Best Regards,

Priyanka

[Esmaeill]

Why did this happen?

Shouldn't the power switch be on USB mode?

[Priyanka]

No, the nRF power supply should be in VDD, because you are powering it via J2. In case you use nRF USB port for connection, that's for the USB power supply.

-Priyanka

[Esmaeill]

I use USB port for connect to pc and power nrf52840 dk v3.0.0.

bord have swith to select power sourc, if i select usb for power selector button, interface ic not work and led5 start fast blinking.

while i use usb port for connect to pc and power, i must set power selector switch on vdd! it is ok?

[Priyanka]

Yes you should set the power selector switch to VDD.

[Esmaeill]

Thank you very much,

but "press the IF BOOT/RESET button while power cycling" still not working for me !?

my interface IC is N5340

[Priyanka]

That's because you have the revision 3 IC and it doesn't have a bootloader. Why do you wish to go into bootloader mode?

[Esmaeill]

Because I worked with nrf52832 dk before and it had this option. I thought both have this option.
Thank you for your guidance and support