External flash

RE: External flash

Carolyne Russel — Tue, 17 Dec 2024 09:19:05 GMT

How can you develop a loader program for the microcontroller, and what considerations should you keep in mind regarding the serial stream protocol and compatibility with existing tools like nrfjprog? 101 games

RE: External flash

XCJ — Tue, 21 May 2024 01:39:32 GMT

I would like to ask how to configure the register to access the external flash?

RE: External flash

AMarch — Mon, 20 May 2024 15:26:30 GMT

Also, Xu, please excuse me for jumping in with a not correct answer. Thank you Turbo J.

RE: External flash

AMarch — Mon, 20 May 2024 15:24:51 GMT

Ah, so jlink can control the QSPI pins through the control registers directly? I mean, I suppose since all the i/o is memory, using jlink to program the QSPI pins can be done. It just didn't occur to me.
My fault.

RE: External flash

Turbo J — Mon, 20 May 2024 15:10:31 GMT

Read the documentation for nrfjprog.

It knows the MCU and you can tell it how the QSPI is connected. Then it can talk to the memory chip via SWD through the NRF MCU.

RE: External flash

AMarch — Mon, 20 May 2024 13:50:40 GMT

I would say it can't be done. Looking at the schematic (I admit that it isn't a hard look), but the flash doesn't appear connected to the JLINK cpu on the board.
That said, the pins for the QSPI seem to be brought out to the P24 pins, which suggests you might be able hook an external programmer to these and program it.

I would accomplish this by creating a loader program (from some example) and program it using some serial stream protocol. This all needs to be made by you.
If the nrfjprog program can do this, I am just unaware of it.

AAM

RE: External flash

Turbo J — Mon, 20 May 2024 13:46:01 GMT

The nrfjprog command line tool should be able to program this flash via JLink.