fatfs example - sd card current draw

RE: fatfs example - sd card current draw

hannes — Fri, 21 Aug 2020 14:46:28 GMT

Thank you! After calling disk_uninitialize(0) the current draw to the SD-card is gone!

RE: fatfs example - sd card current draw

Vidar Berg — Tue, 04 Aug 2020 12:13:09 GMT

Hello,

Sorry for the delayed response. Stian is currently out of the office. I had a look at the example, and it seems like you can use disk_uninitialize() for this. It should un-initialize the SPI driver as well.

RE: fatfs example - sd card current draw

hannes — Tue, 14 Jul 2020 14:11:04 GMT

I've implemented the fstfs example from SDK 15.3. A Block Device is used there to handle the SPI-stuff. I didn't have a look what driver is used in the background then. If possible I want to stay close to the example. Do you know how to handle this using the block-device?

RE: fatfs example - sd card current draw

Stian Røed Hafskjold — Tue, 14 Jul 2020 13:48:03 GMT

Hi, yes. First you will typically disable the SPI driver. And then you set the pins as disconnected input pins. Then there will not flow any current through the pins. Some driver implementations are doing this automatically when the SPI is uninitialized, so it depends on the implementation you are using. Are you using the SPI nrfx driver? And if so, which nrfx version?