Re-work hints for QSPI flash on PCA10056

[Julie H]

The design I'm working on will tentatively use "Original SPI" (like "Original Coke" ...), so I started cutting up the QSPI bridges to disconnect DIO2 and DIO3 (which are also other things ...) prior to pulling them up to Vcc.

Has anyone else done this? I'm comfy working under a microscope, but I'm an old geezer fart and I'm always looking for huge pads and buttons and knobs and dials I can use.

[ovrebekk]

Hi Julie

There are several standard SPI interfaces in the nRF51840, both master and slave, so you shouldn't need to repurpose the QSPI interface for this.

If you just need standard SPI I would simply use the SPIM0 or SPIM1 interface instead ;)

Best regards
Torbjørn

[ovrebekk]

Hi Julie

How to disconnect the QSPI memory chip is explained here.

The pins connected to buttons and LED's can typically be re-purposed without having to make any changes, as neither the buttons nor the LED's should pull the pins low or high when not in use (pressing the buttons will obviously pull the pins).

There is a USB dongle board planned based on the nRF52840. It will have less buttons and LED's, but also less total IO available, since the board is much smaller.

Best regards
Torbjørn