UART Example Problem when changing pins

RE: UART Example Problem when changing pins

steelman.kwon — Sat, 02 Apr 2022 03:46:59 GMT

I have the same problem.
I am using IAR.
If the problem was solved by changing the IDE, it seems to be solved by the IDE settings. Which setting is it?

Please give me a good advice.

RE: UART Example Problem when changing pins

Joakim Jakobsen — Wed, 09 Jan 2019 07:24:23 GMT

Hi martabc_96,

Maybe you could post a new question about this?
Please explain in detail your setup etc.

Thanks,
Joakim.

RE: UART Example Problem when changing pins

martabc_96 — Mon, 07 Jan 2019 16:05:54 GMT

Hi, I'm having exactly the same issue. Running the examples/peripheral/uart example it works fine with pins 6 and 8 from port 0 in PCA10056 board. But when I change the pin to a free pin there is no communication. I'm using SES. Should I try another IDE? Am I missing any other change in the code, apart from the definition of RX_PIN_NUMBER and TX_PIN_NUMBER in pca10056.h?

Thanks in advance!

RE: UART Example Problem when changing pins

Joakim Jakobsen — Tue, 07 Aug 2018 12:25:22 GMT

Thank you.

It worked fine when I tested it using SES. I'll do some tests using Keil and see what I can find out.

Cheers.

RE: UART Example Problem when changing pins

TK Here — Tue, 07 Aug 2018 12:19:14 GMT

I was using Keil.

RE: UART Example Problem when changing pins

Joakim Jakobsen — Tue, 07 Aug 2018 11:47:33 GMT

I'm glad you were able to "solve" the issue.

Could you tell me which IDE you were using when you got the error?

Cheers.

RE: UART Example Problem when changing pins

TK Here — Fri, 03 Aug 2018 12:26:16 GMT

I changed to IAR and works fine. So I am good. Thanks for the support from everyone.

RE: UART Example Problem when changing pins

Joakim Jakobsen — Fri, 03 Aug 2018 10:18:24 GMT

That sounds strange. I tried using pins 22/23 and I don't have any problems.

Are you using the ble_peripheral/ble_app_uart or the peripheral/uart example? And which SDK version?

RE: UART Example Problem when changing pins

TK Here — Wed, 01 Aug 2018 14:39:24 GMT

I am using uart_pca10040. I do not see where pins 22 and 23 are being used. Can you be more specific?

RE: UART Example Problem when changing pins

WestCoastDaz — Tue, 31 Jul 2018 15:59:53 GMT

Which example are you using? If you look at the board support file, pca10040.h, you will see that pins 22 and 23 are defined for different peripherals. Is it possible that the example you are using is redefining those pins when another peripheral gets enabled?

RE: UART Example Problem when changing pins

TK Here — Mon, 30 Jul 2018 13:56:54 GMT

Connects perfectly with cable to terminal emulator with pins 8 and 6. Changing RX_PIN_NUMBER and TX_PIN_NUMBER and moving the wiring, it does not work.

RE: UART Example Problem when changing pins

TK Here — Mon, 30 Jul 2018 13:53:37 GMT

PCA10040 1.2.1 2017.45

Yes, pins should be free

RE: UART Example Problem when changing pins

Joakim Jakobsen — Mon, 30 Jul 2018 08:02:07 GMT

Why do you change the TX/RX pin? Do you connect it to something else?
If you connect it to something else, do you also connect the other device to ground?

If you just change the pin number, but don't connect anything to it, it will be left floating in the wind and will pick up noise. The UART will then believe that the noise is actual data, but not be able to make sense of it. Then it generates a Communication error.

Best regards,
Joakim

RE: UART Example Problem when changing pins

WestCoastDaz — Wed, 25 Jul 2018 22:54:00 GMT

TK Here Which version of the 52DK are you using? Is it the nRF52832(PCA10040) or the nRF52840 (PCA10056)? Have you checked to see if those pins are available on the DK by reviewing DK hardware files?