Interface External flash to nrf52832

[sara]

I want to interface a 16MB external flash (SPI) with nrf52832 on the development board.Suggest me how should I start with and if there is an example for external flash then let me know. 

[ovrebekk]

Hi

It seems there are a couple of problems here. First off the UART TX buffer should be increased to allow the longer log messages to be buffered properly (I increased it from 256 to 1024 bytes), but more importantly the SPI driver is limited to 255 byte transactions, which makes it fail when you try to send 256 bytes in one go. 

I made a slight change to the driver to split transactions longer than 255 bytes into multiple transactions:

DZ233955_ble_app_uart_v2.zip

Please note that the sensor has it's own limitations. If I remember correctly you can't write more than 256 bytes in one go (but I am sure you can read more). 

Regarding erase I think it is sufficient to specify any address within the block to erase the whole block, but specifying the start address of the block seems the most logical. 

Best regards
Torbjørn

[sara]

Thanks a lot, Torbjorn. I tried whole day to get make the flash write 256 bytes but was not able to do :( Thank you for your support. :). I tested it with my hardware and its working.

[sara]

Thanks!

[ovrebekk]

That's great, hopefully you will have less problems going forward

[sara]

Thanku for your best wishes.