SDK Block devices

[mosgaard2000]

I am looking into interfacing a SD card to the nRF52840. I have used the FatFS example and that is working ok with SPI. Then I have looked at the QSPI example and that also works, but it doesn't use FatFS.

I then see that FatFS uses a 'Block Device' with SDC implementation. There is also a 'Block Device' with QSPI implementation.

What is a 'Block Device' and how does it differ from using the nrf_drv?

If I want to use FatFS with QSPI should I then use the 'Block Device'?

Is it possible to use 'Block Device' with Empty implementation to make my own GPIO/bit-banging port?

[Pawel Zadrozniak]

Block device is a universal abstraction for storage devices operating on data blocks.
If FATFS port uses block device API then you can instantiate nrf_block_dev_qspi instead of nrf_block_dev_sdc and use the filesystem on QSPI flash.

Take a look at usbd_msc example. QSPI block device is used there, as fas as I recall.

www.nordicsemi.com/.../group__nrf__block__dev