NRF5340 Nor Flash SPI/QSPI Fat FS

RE: NRF5340 Nor Flash SPI/QSPI Fat FS

d_c_h_w — Mon, 07 Mar 2022 16:45:37 GMT

Bit late, but this sound like the issue I had

https://devzone.nordicsemi.com/f/nordic-q-a/72564/increased-idle-current-draw-in-nrf5340-when-spi4-chosen-over-spi1

There is a workaround in there to drop the idle current.

RE: NRF5340 Nor Flash SPI/QSPI Fat FS

Kenneth — Tue, 18 Jan 2022 08:53:22 GMT

Hi, I have not tried it myself, but I believe this example use QSPI:
https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/samples/subsys/usb/mass/README.html

RE: NRF5340 Nor Flash SPI/QSPI Fat FS

edmcnicholas — Thu, 13 Jan 2022 14:06:21 GMT

Kenneth thanks for the update. As for QSPI there is no example that uses qspi as a fatfs that i can see. I would have thought that i would simply replace the spi nor with qspi nor and that was that, but that does not seem to be the case. I have done extensive debugging with this but it will not load the FS unless the FS already existed from previously using SPI mode. When I don't have an FS the FS code responds that it has created the file system but fails to mount with error -19 device does not exist. Could this be a driver issue in the FS code for qspi?

RE: NRF5340 Nor Flash SPI/QSPI Fat FS

Kenneth — Thu, 13 Jan 2022 12:27:07 GMT

This is not obvious from product specification, but there is a difference in hardware between spi3 and spi4, because spi4 support high-speed it uses a different regulator internally, which unfortunately cause higher current consumption. That said, it should be possible to handle this difference (in other words drastically reduce it) in the driver's power management of the spi4, but I can find this is currently not the case. We will need to create an internal case to look at the power management of spi4.

I am not sure why you are not getting qspi to work, I do believe there should be some examples you can use as reference. That said, I do believe also qspi also suffer from a power management handling in the driver, which cause it to have excessive current at the moment. I believe this is already in progress to be fixed, but you may need to switch to main branch of ncs.

Best regards,
Kenneth

RE: NRF5340 Nor Flash SPI/QSPI Fat FS

edmcnicholas — Wed, 12 Jan 2022 16:55:05 GMT

So one update I moved the interface to SPI3 and the power went down to 7.7uA in idle. So I am seeing an issue with SPI4 and QSPI at this point in time. I need one of these interfaces as loading and reading files will be very slow otherwise.