Low power UART library

RE: Low power UART library

bjorn-spockeli — Mon, 21 Jun 2021 08:32:08 GMT

9mA is very high. Based on the nRF52832 Product Specification it would seem that the CPU is running, typically ~8mA. The additional 1mA is probably the HFCLK and UART peripheral compounded. So it could sound like there is something that prevents the sample from going to sleep, i.e. WFE or WFI. I suggest you open a new ticket with details on your setup and serial traces if possible.

RE: Low power UART library

Senchoi — Mon, 21 Jun 2021 05:41:50 GMT

that's strange. Libuarte example reaches 9mA average. How is it going to be used as low power?

RE: Low power UART library

bjorn-spockeli — Thu, 31 Oct 2019 14:30:00 GMT

Happy to help.

RE: Low power UART library

sboudaud — Thu, 31 Oct 2019 13:28:18 GMT

Thanks Bjorn for the quick reply

RE: Low power UART library

bjorn-spockeli — Thu, 31 Oct 2019 12:30:39 GMT

Hi Stephane,

I think that the nRF5 SDK v16.0.0: Libuarte - advanced UARTE driver is the best fit for this. Quote from the documentation:

nrf_libuarte_drv can be configured with hardware events that will start and stop the receiver. This option can be used, for example, to build a low power UART protocol with request and response pins that will enable the receiver only during a transfer. All hardware tasks and events are connected with PPI, which allows autonomous operation that does not depend on the interrupt handling time.

Best regards

Bjørn