Programming external flash (QSPI) to save a file using zephyr

RE: Programming external flash (QSPI) to save a file using zephyr

Hung Bui — Fri, 09 Jan 2026 13:52:21 GMT

Hi Faheem,

Do you have a nRF52840dk to test with ?
I attached here a sample that works with nRF52840 DK.
Please try to compare the dts file configuration for qspi on the DK and on your board to see if there is any potential issues.

devzone.nordicsemi.com/.../littlefs_5F00_qspi.zip

Note that to be able to use "nrfjprog --family NRF52 --qspiXXX" command you would need to configure the pin correctly using --qspini file (or edit QspiDefault.ini in the nrfjprog\share folder. )

RE: Programming external flash (QSPI) to save a file using zephyr

fshaikh — Thu, 08 Jan 2026 00:40:15 GMT

I reviewed that post and ran the command "nrfjprog --family NRF52 --qspieraseall" however it failed to initiate the QSPI peripheral.

I noticed in my hardware that I am missing a pullup on the CS line. Could that be the issue with the external flash?

I tried adding it in software but it doesnt seem to do anything. I shouldve noticed that the datasheet states this

"4.1 Chip Select (/CS)
The SPI Chip Select (/CS) pin enables and disables device operation. When /CS is high the device is
deselected and the Serial Data Output (DO, or IO0, IO1, IO2, IO3) pins are at high impedance. When
deselected, the devices power consumption will be at standby levels unless an internal erase, program or
write status register cycle is in progress. When /CS is brought low the device will be selected, power
consumption will increase to active levels and instructions can be written to and data read from the device.
After power-up, /CS must transition from high to low before a new instruction will be accepted. The /CS
input must track the VCC supply level at power-up and power-down (see “Write Protection” and Figure
58). If needed a pull-up resistor on the /CS pin can be used to accomplish this"

Is there a way to configure this in the code so that CS can be turned on and off? Or is a pullup required?

RE: Programming external flash (QSPI) to save a file using zephyr

IoT-Dani — Wed, 07 Jan 2026 11:20:05 GMT

Hi fshaikh

Did you see the post from over two years ago?

Case ID: 323060: Getting "Corrupted dir pair at {0x0, 0x1} ..."

Getting "Corrupted dir pair at {0x0, 0x1} ..." error if I do nrfjprog --eraseall then flash the application

I don't know if that will bring you any further.

Kind regards, Dani