SPIM (EasyDMA) to increase power consumption

RE: SPIM (EasyDMA) to increase power consumption

Nguyen Hoan Hoang — Fri, 04 Jan 2019 19:17:24 GMT

yep, undocumented. It works for other peripheral as well.

RE: SPIM (EasyDMA) to increase power consumption

Tamas Selmeci — Fri, 04 Jan 2019 19:15:22 GMT

Thanks, I'll try it on Monday. By the way, why is the POWER register undocumented on SPIM peripherals? When I was looking at errata 89 I was thinking that offset 0xFFC is just a typo, since I couldn't find it in the docs or in MCU description header files in the SDK...

RE: SPIM (EasyDMA) to increase power consumption

Nguyen Hoan Hoang — Fri, 04 Jan 2019 18:38:04 GMT

You need to power off the spi. see this code https://github.com/I-SYST/EHAL/blob/master/ARM/Nordic/src/spi_nrf5x.cpp

look for the fonction nRF5xSPIPowerOff

RE: SPIM (EasyDMA) to increase power consumption

Tamas Selmeci — Fri, 04 Jan 2019 13:05:47 GMT

TASKS_STOP and EVENTS_STOPPED are handled but nothing changes.

RE: SPIM (EasyDMA) to increase power consumption

Turbo J — Fri, 04 Jan 2019 12:41:20 GMT

NRF52840 PS chapter 6.25.5 (SPIM: Low Power) strongly suggests using TASKS_STOP and waiting for the EVENTS_STOPPED event before disabling the peripherial (ENABLE register).

Otherwise the SPIM will probably just request the HFINT/HFCLK clock signal.