THE uart of 52832

RE: THE uart of 52832

Joakim Jakobsen — Fri, 12 Jul 2019 06:51:38 GMT

Hi Brent.

No, the uart doesn't have to be 8/7 (or 8/6 like it's configured in the SDK), so we can't make a rule like that. You can use any GPIO just as you'd like.

Best regards.

RE: THE uart of 52832

brent_dong — Thu, 11 Jul 2019 20:36:50 GMT

Hi,All,

Glad to see the information, but what is the solution? according to nrf52832 data sheet, any GPIO can be defined as uart pin and made the board, we need to make it a rule, uart has to be 8,7?

Thanks

Brent

RE: THE uart of 52832

Joakim Jakobsen — Wed, 01 Aug 2018 14:56:23 GMT

Hi!

Those definitions is, as you can see, in the pca10040.h header.
PCA10040 is, as you might know, the nRF52-DK.

On the nRF52-DK the UART pins are internally connected to the on-board Segger debugger chip, and it will be available on your PC as a normal COM port.
If you are using the nRF52-DK and want to make use of this, then I would recommend this pinout.

However, any of the GPIO's can be used as long as they aren't used by any of the other peripherals.

nRF52 Development Kit User Guide v1.2 - 5.2 Virtual COM port.

Best regards,
Joakim.

RE: THE uart of 52832

PhilippeG — Sat, 28 Jul 2018 15:34:47 GMT

Hi Joakim,

Thanks for this post. In the pca10040.h, i see that :

#define RX_PIN_NUMBER 8

#define TX_PIN_NUMBER 6

#define CTS_PIN_NUMBER 7

#define RTS_PIN_NUMBER 5

Does it means by default your chips nrf52832 are configured this way, is it what you recommand to use as a pinout of the nrf52832?

thanks

RE: THE uart of 52832

Joakim Jakobsen — Mon, 23 Jul 2018 12:57:15 GMT

Hi!

I can see that you have another post almost identical to this one, that one of my colleagues has reponded to. I'll copy their answer to this thread as well.
As you didn't repond to my colleagues answer, might we assume that the issue has been resolved?

Martin's answer:

"Why do you change the 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: THE uart of 52832

jinxiuqueling73 — Fri, 13 Jul 2018 03:05:35 GMT

please help me

RE: THE uart of 52832

Bastien Reynard — Thu, 12 Jul 2018 11:57:26 GMT

I'm no Nordic. Good luck mate.

RE: THE uart of 52832

jinxiuqueling73 — Thu, 12 Jul 2018 11:51:38 GMT

These is not my code, it is yours. I download at https://www.nordicsemi.com/eng/nordic/Products/nRF5-SDK/nRF5-SDK-zip/59011 .I dId nothing but changeed PCA10040.h

RE: THE uart of 52832

Bastien Reynard — Thu, 12 Jul 2018 11:28:53 GMT

You need to debug your code and see what is the error code that is returned when it occurs. And make sure you are not using the P0.19 pin elsewhere in you code.

RE: THE uart of 52832

jinxiuqueling73 — Thu, 12 Jul 2018 09:55:54 GMT

#define RX_PIN_NUMBER 8 //8
#define TX_PIN_NUMBER 18//6
#define CTS_PIN_NUMBER 0XFF
#define RTS_PIN_NUMBER 0XFF
#define HWFC false// true

As above, the software runs well . why? The RX must be used P0.08? But my hardware can't change now.

RE: THE uart of 52832

jinxiuqueling73 — Thu, 12 Jul 2018 09:44:41 GMT

J-LINK STILL PRINTS the following

0> <error> app: Communication error occurred while handling UART.
0> <error> app: Fatal error

RE: THE uart of 52832

jinxiuqueling73 — Thu, 12 Jul 2018 09:36:21 GMT

#define RX_PIN_NUMBER 19 //8
#define TX_PIN_NUMBER 18//6
#define CTS_PIN_NUMBER 0XFF
#define RTS_PIN_NUMBER 0XFF
#define HWFC false// true

I changed as above. but the software still doesnot run.

RE: THE uart of 52832

Bastien Reynard — Thu, 12 Jul 2018 09:33:22 GMT

Then,

#define RX_PIN_NUMBER 19
#define TX_PIN_NUMBER 18

No?

RE: THE uart of 52832

jinxiuqueling73 — Thu, 12 Jul 2018 09:32:10 GMT

RX IS used P0.19 , TX is used P0.18

RE: THE uart of 52832

jinxiuqueling73 — Thu, 12 Jul 2018 09:30:08 GMT

I said the pin nuber is the number of IC.

RE: THE uart of 52832

Bastien Reynard — Thu, 12 Jul 2018 09:24:56 GMT

nRF52832 has 32 GPIOs from P0.00 to P0.31. Check your hardware for the right pin numbers.