Low Power UART Example with HFC

RE: Low Power UART Example with HFC

Sigurd — Mon, 23 Aug 2021 10:13:08 GMT

[quote user="Sivashankar"]So It's recommend to start developing the application with nRF Connect SDK and stop using nRF5_SDK.[/quote]

Generally, the nRF5 SDK is stable and will get maintenance when needed, so if you already have developed products using nRF5 SDK then there is no problem to continue with that. If you are starting developing new products, and for instance interested in the nRF53 and nRF91, then looking at the NCS is the solution for you.

RE: Low Power UART Example with HFC

Sivashankar — Fri, 20 Aug 2021 13:05:26 GMT

[quote userid="15146" url="~/f/nordic-q-a/78428/low-power-uart-example-with-hfc/325976#325976"]I can forward such an request, but our focus is mainly on nRF Connect SDK(NCS) now, so most likely there will not be such an example in nRF5 SDK anytime soon[/quote]

So It's recommend to start developing the application with nRF Connect SDK and stop using nRF5_SDK.

RE: Low Power UART Example with HFC

Sigurd — Fri, 20 Aug 2021 13:00:30 GMT

[quote user="Sivashankar"]Could you please consider this as user request to add one such example in nRF5_SDK_xx.xx.xx.[/quote]

I can forward such an request, but our focus is mainly on nRF Connect SDK(NCS) now, so most likely there will not be such an example in nRF5 SDK anytime soon

RE: Low Power UART Example with HFC

Sivashankar — Tue, 17 Aug 2021 11:57:51 GMT

[quote userid="15146" url="~/f/nordic-q-a/78428/low-power-uart-example-with-hfc/325279#325279"]No, it's 2 different SDK's and cannot be combined easily.[/quote]

If so can you recommend/refer me some examples which would make sense to app developed in nrf_SDK 17.0.2. A simple LPUART with nrf_SDK 17.0.2.

I can able to see LP_PWM in \nRF5_SDK_17.0.2_d674dde\examples\peripheral but no LP_UART.

Could you please consider this as user request to add one such example in nRF5_SDK_xx.xx.xx.

RE: Low Power UART Example with HFC

Sigurd — Tue, 17 Aug 2021 11:42:47 GMT

[quote user="Sivashankar"]1. Can I use samples/peripheral/lpuart with my existing app, currently I'm using nrf_SDK 17.0.2, so bit confused how to import nrf_connect lib and drivers.[/quote]

No, it's 2 different SDK's and cannot be combined easily.

[quote user="Sivashankar"]Can I implement it with hardware flow control?[/quote]

From the doc: "The protocol used by this driver implements two control lines, instead of standard hardware flow control lines, to allow for disabling the UART receiver during the idle period. "

What is the use-case for using UART in your application? Connect to a different microcontroller, and both sending and receiving data? If yes, what microcontroller are you using, 2 different nRF52? OR is the use-case e.g. logging?

RE: Low Power UART Example with HFC

Sivashankar — Mon, 16 Aug 2021 14:29:07 GMT

Hi Sigurd,

[quote userid="15146" url="~/f/nordic-q-a/78428/low-power-uart-example-with-hfc/325066#325066"]

In addition to the post you have linked to, also see these:

https://devzone.nordicsemi.com/f/nordic-q-a/69357/nrf52840-uart-current-consumption-in-datasheet

https://devzone.nordicsemi.com/f/nordic-q-a/66914/uart-current-consumption/

[/quote]

Thanks for the references, Question with them again is, If we want to us a GPIO for enabling and disabling UART means what's the purpose of RTS/CTS(Hardware flow control pins) and why is there increase in current after enabling HFC

[quote userid="15146" url="~/f/nordic-q-a/78428/low-power-uart-example-with-hfc/325066#325066"]

For NCS I recommend using the LP-UART driver:

http://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.6.1/nrf/drivers/uart_nrf_sw_lpuart.html

[/quote]

I may be asking very basic questions as I'm quit new to nordic, Please excuse if I'm silly.

1. Can I use samples/peripheral/lpuart with my existing app, currently I'm using nrf_SDK 17.0.2, so bit confused how to import nrf_connect lib and drivers.

2. On a overview with LP-UART example(https://github.com/nrfconnect/sdk-nrf/blob/master/samples/peripheral/lpuart/src/main.c) Can I implement it with hardware flow control?

3. Is there any current measurement taken with this example (say with nrf52840 dk) ?

[quote userid="15146" url="~/f/nordic-q-a/78428/low-power-uart-example-with-hfc/325066#325066"]For nRF5-SDK, the examples here might be useful: https://github.com/NordicPlayground/nrf51-UART-examples/tree/master/ble_app_uart_low_power[/quote]

Have seen this reference with many post, and ignored as it was around 7 years old reference, do you still recommend spending time, inferring this reference.

RE: Low Power UART Example with HFC

Sigurd — Mon, 16 Aug 2021 10:29:19 GMT

Hi,

In addition to the post you have linked to, also see these:

https://devzone.nordicsemi.com/f/nordic-q-a/69357/nrf52840-uart-current-consumption-in-datasheet

https://devzone.nordicsemi.com/f/nordic-q-a/66914/uart-current-consumption/

For NCS I recommend using the LP-UART driver:

http://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.6.1/nrf/drivers/uart_nrf_sw_lpuart.html

For nRF5-SDK, the examples here might be useful: https://github.com/NordicPlayground/nrf51-UART-examples/tree/master/ble_app_uart_low_power

RE: Low Power UART Example with HFC

Sivashankar — Tue, 10 Aug 2021 11:26:54 GMT

I want UART Rx to be waked up with RTS and UART Tx at BLE events. So I don't want UART to be closed/Disabled.

Usually I work with MSP, where I'll attach interrupt to UART_Rx which wake up and add received byte in buffer and sleep. It saves me lot of power there.

Not sure will the same kind of approach is possible here.