nRF52840 DK P1.11 & P1.12 can not be used.

RE: nRF52840 DK P1.11 & P1.12 can not be used.

Jared — Tue, 16 Jul 2024 09:29:44 GMT

Hi,

Your application is fine, this is what I measure on the P.11 and P.12:

So something is wrong with your custom boards.

Can you recheck if the board has been soldered correctly and specify how many devices you see the issue on?

regards

Jared

RE: nRF52840 DK P1.11 & P1.12 can not be used.

TGuanLa — Wed, 10 Jul 2024 03:03:01 GMT

Hi,

I have checked that the pins from the header J11 has been connected to the pads on the nRF52840.

And they are not shorted either.

May I ask if you can try my project and check if the values of P1.11 and P1.12 can be successfully set?

Thank you so much!

RE: nRF52840 DK P1.11 & P1.12 can not be used.

Jared — Tue, 09 Jul 2024 08:27:21 GMT

Hi,

How many devices do you see the issue on? What percentage of totally produced devices?

Can you check if the pins from the header J11 are connected to the pads on the nRF52840 by using a multimeter.

Can you check if any of the pins are shorted too?

regards

Jared

RE: nRF52840 DK P1.11 & P1.12 can not be used.

TGuanLa — Tue, 09 Jul 2024 07:37:19 GMT

I have tried, but P1.11 and P1.12 values were not changed.

RE: nRF52840 DK P1.11 & P1.12 can not be used.

Jared — Mon, 08 Jul 2024 09:19:38 GMT

Hi,

Ok, can you try to flash the blinky sample but change the LED pin to first P1.11 and then repeat with P1.12. Do you see the GPIOs toggling?

regards

Jared

RE: nRF52840 DK P1.11 & P1.12 can not be used.

TGuanLa — Fri, 05 Jul 2024 08:38:44 GMT

I use multimeter to measure voltage of P1.11&P1.12. Their voltages are both around 0.2V.

I also tried to set these two pins as GPIO_OUTPUT, but their voltages were not changed either.

RE: nRF52840 DK P1.11 & P1.12 can not be used.

Jared — Thu, 04 Jul 2024 11:39:24 GMT

Hi,

Do you have a logic analyzer or a oscilloscope? Can you disconnect anything externally that is connected to the UART pins such as the USB to TTL converter and measure directly on the UART pins and see if you see any activity?

regards

Jared

RE: nRF52840 DK P1.11 & P1.12 can not be used.

TGuanLa — Thu, 04 Jul 2024 05:44:12 GMT

Hi,

Yes, I wanna use printf to send logs from P1.12 and P1.11.

I use USB to TTL converter to monitor the UART output. Unfortunately there is nothing output.

Besides, I measure P1.11&P1.12 voltage which are both about 0.2V. It means that these two pins are not either pulled down or up.

Here is my custom board SCH.

Here is my testing project from blinky sample. My NCS version is v2.3.0.

devzone.nordicsemi.com/.../5531.blinky.zip

Thanks!

RE: nRF52840 DK P1.11 & P1.12 can not be used.

Jared — Wed, 03 Jul 2024 10:55:22 GMT

Hi,

Are you trying to send the logs from printf to P1.12 and P1.11? How are you monitoring the output?

regards

Jared