NRF52 virtual com port over bluetooth

RE: NRF52 virtual com port over bluetooth

gnrboy — Mon, 30 Sep 2019 12:08:20 GMT

Is any news about implementing other UART modes such as 8N2, 8E2, 7O1, 7E1, 7O2 and 7E2 ?

RE: NRF52 virtual com port over bluetooth

awneil — Tue, 23 Jul 2019 09:32:30 GMT

That's a new question - start a new thread!

If the question in this thread is now resolved, please verify the answer:

RE: NRF52 virtual com port over bluetooth

gnrboy — Tue, 23 Jul 2019 09:26:39 GMT

can you please help i use ble _ nus and after few message i need to change uart baudrate. I cloes uart then init uart with new baudrate parameter but everytime MCU goes to in error handler function. Where will be best to put new uart initialization. I know that after i send via bluetooth to nrf52840 0x06 0x39 0x36 0x30 0x30 and nrf52840 forward this message on tx in next 200 ms device connected to nrf52840s uart will respond on new baudrate which i have send that it changes.

RE: NRF52 virtual com port over bluetooth

awneil — Tue, 16 Jul 2019 08:26:23 GMT

You said you wanted even parity?

Even Parity is supported:

The nRF52840 & mRF52811 (newest BLE chip) UARTs seems to be the same - so this does not seem to be high on Nordic's priority list.

RE: NRF52 virtual com port over bluetooth

gnrboy — Tue, 16 Jul 2019 08:17:05 GMT

because that i have been confused ... In near future are maybe possibility to add this feature and maybe to add odd parity as well in next gen SoC of nrf528xx

RE: NRF52 virtual com port over bluetooth

awneil — Tue, 16 Jul 2019 08:07:49 GMT

Always helpful to make clear that you have actually looked, and what you found!

You're right - it's not explicitly stated!

😞

But that fact that it only mentions using the 9th bit for parity:

suggests that it will always and only use 8 bits for data.

As there is no register to configure it, we must assume that it is not configurable.

😞

Note that there is a link at the foot of each InfoCentre page for you to provide feedback on the documentation...

RE: NRF52 virtual com port over bluetooth

gnrboy — Tue, 16 Jul 2019 07:44:34 GMT

nothing i cant find about configuring number of data bits

RE: NRF52 virtual com port over bluetooth

awneil — Tue, 16 Jul 2019 07:36:22 GMT

The Product Specification tells you the capabilities of the UART hardware.

So what does the Product Specification tell you about supported frame sizes & parity options?

RE: NRF52 virtual com port over bluetooth

gnrboy — Tue, 16 Jul 2019 07:07:30 GMT

how to achieve uart 7e1 ??

RE: NRF52 virtual com port over bluetooth

gnrboy — Fri, 12 Jul 2019 07:46:23 GMT

https://devzone.nordicsemi.com/f/nordic-q-a/391/uart-baudrate-register-values

i find about baudrate

But how to achieve 7E1

RE: NRF52 virtual com port over bluetooth

gnrboy — Fri, 12 Jul 2019 06:55:48 GMT

a dont see anywhere about 300baud. Because protocol which device communicateit must start on 300 baud then switch to some bigger baud. Also i need that 7E1 .

RE: NRF52 virtual com port over bluetooth

awneil — Wed, 10 Jul 2019 09:34:26 GMT

It's all documented in the User Guide:

https://www.nordicsemi.com/?sc_itemid=%7B6BECB3CF-00F7-4B2D-8553-F1AD6AC458EF%7D

Use the 'Get Documentation' Button.

Also scroll down & choose the 'Downloads' tab - there you can get the schematics.

RE: NRF52 virtual com port over bluetooth

gnrboy — Wed, 10 Jul 2019 06:48:19 GMT

can you please tellm me on which header are connected on nrf52840 DK UART pins and i need to configure uart on baudrate 300 7e1

RE: NRF52 virtual com port over bluetooth

awneil — Fri, 05 Jul 2019 09:40:15 GMT

Are you talking about using the USB in the nRF52840, or going via a USB-to-UART converter?

If the former, yes, the USB CDC ACM Class does transfer that information;

If the latter, no.

RE: NRF52 virtual com port over bluetooth

gnrboy — Fri, 05 Jul 2019 07:46:39 GMT

THnak you, can when it show on my pc for example putty and i define baudrate , parity... can i read which baudrate , parity did user choose when it is from putty via virtual com port whant to connect?

PC <-> USB <->NRF52840

RE: NRF52 virtual com port over bluetooth

awneil — Thu, 04 Jul 2019 13:37:33 GMT

See the Product Specification - the nRF52832 does not have USB. So you'd have to provide a separate USB-to-UART (or whatever) conversion.

But the nRF52840 does have USB.

RE: NRF52 virtual com port over bluetooth

gnrboy — Thu, 04 Jul 2019 13:27:30 GMT

Ok but can nr52832 show as virtual COM port ?

I ask to connect nrf52832 on my PC USB port and that device show itself as a virtual com port?

RE: NRF52 virtual com port over bluetooth

awneil — Tue, 02 Jul 2019 10:26:38 GMT

It's all just using standard BLE features, so - yes!

But note that nRF51 is not recommended to new BLE designs:

https://devzone.nordicsemi.com/f/nordic-q-a/42960/status-of-nrf51-products/169728#169728

RE: NRF52 virtual com port over bluetooth

gnrboy — Tue, 02 Jul 2019 10:21:19 GMT

Is that supported on all nrf52/nrf51 series SoC?

RE: NRF52 virtual com port over bluetooth

awneil — Tue, 02 Jul 2019 08:25:23 GMT

There is nothing like that defined for BLE.

So you will have to use something proprietary - like the Nordic UART Service (NUS) linked above.

RE: NRF52 virtual com port over bluetooth

gnrboy — Tue, 02 Jul 2019 08:22:29 GMT

I need something like profile SPP

RE: NRF52 virtual com port over bluetooth

awneil — Tue, 02 Jul 2019 07:36:47 GMT

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/ble_sdk_app_nus_eval.html

As in a USB VCP, the baud rate is only relevant to the wired connection betwween the nRF52832 and the external device - it is irrelevant to the BLE link, and at the smartphone end.

You could either invent your own in-band protocol - so commands are carried with the UART payload - or create some separate out-of-band control protocol.

For the latter, you'd need to define your own Characteristic(s)...

https://devzone.nordicsemi.com/nordic/short-range-guides/b/bluetooth-low-energy/posts/ble-characteristics-a-beginners-tutorial

maybe also a Service:

https://devzone.nordicsemi.com/nordic/short-range-guides/b/bluetooth-low-energy/posts/ble-services-a-beginners-tutorial