How can I change rx tx pins of BT840F?

RE: How can I change rx tx pins of BT840F?

awneil — Fri, 19 Feb 2021 10:46:29 GMT

RE: How can I change rx tx pins of BT840F?

brkcnfzl — Fri, 19 Feb 2021 07:38:48 GMT

Thank you so much Edvin. I changed pins and it worked. HWFC is disable.

RE: How can I change rx tx pins of BT840F?

Edvin — Thu, 18 Feb 2021 15:26:52 GMT

P0.01 (and P0.00) is usually the LFXTAL (if present), so try to stay away from that one as well.

If you still do not see it, try analyzing the pins with a logic analyzer. Do you see any UART data in the logic trace?

Is the data you are missing coming to the nRF52840, or are you trying to send it? Do you have HWFC enabled?

BR,
Edvin

RE: How can I change rx tx pins of BT840F?

brkcnfzl — Thu, 18 Feb 2021 14:19:57 GMT

Hi Edvin. I can get data from BLE . I didn't receive the data UART . Yes you right. They are NFC pins i changed them as p0.01 and p0.03. I am using SES and yes nRF5 SDK on the BT840F. When i connected Arduino and nrf52840DK(P0.06 and p0.08 ) there is no problem. But when I tried use bt840f pins(4. and 6. pins ) to UART com. with Arduino , it didn't work. I also check clock configs for internal crystal of bt840f. I dont know what is the problem.

RE: How can I change rx tx pins of BT840F?

Edvin — Thu, 18 Feb 2021 13:47:55 GMT

Hello,

[quote user=""]but when i use bt840f i didn't read data.[/quote]

What does this mean? You didn't receive the data over UART, or do you not receive the data over BLE? During what step is it lost? I am not familiar with the BT840F. Are those pins used for something else? Are you using the nRF5 SDK on the BT840F? If so, have you considered that the pins P0.09 and P0.10 are the NFC pins? Perhaps you forgot the CONFIG_NFCT_PINS_AS_GPIOS preprocessor definition. Let me know what IDE you are using if you are not sure how to add preprocessor definitions.

On the nRF52840 DK you need to modify the board a bit to get the pinout to connect to pin P0.09 and P0.10. Perhaps there is something similar on the BT840F? Check the datasheet that the pins are routed out as you expect (make sure that pin 10 is actually connected to what you believe is pin10 on the board).

Best regards,

Edvin

RE: How can I change rx tx pins of BT840F?

brkcnfzl — Thu, 18 Feb 2021 06:23:45 GMT

Ohh okey. Thank you owneil.

RE: How can I change rx tx pins of BT840F?

awneil — Wed, 17 Feb 2021 17:41:30 GMT

[quote userid="93759" url="~/f/nordic-q-a/71736/how-can-i-change-rx-tx-pins-of-bt840f"]BT840F[/quote]

You mean this: https://www.fanstel.com/bt840 ?

Note that Fanstel is an independent 3rd party; so you need to go to them for specific support with their modules - eg, if they impose any restrictions on pin usage.

Have you checked the Fanstel documentation?

[quote userid="93759" url="~/f/nordic-q-a/71736/how-can-i-change-rx-tx-pins-of-bt840f"]i am not sure the numbers[/quote]

You would have to confirm that with Fanstel - doesn't their documentation tell you the relationship between the module pins and the nRF52840 pins?