USB device (USBD) controller

[Mo]

How can I modify the USBD example of creating a mass staorage device to have only 1 drive (when I run the example, I get 3) ?

[Sigurd]

Hi,

This is covered by the documentation for the example, see this link.

Quote:

Every logical unit is a block device instance that describes the physical memories. To choose which block devices should be visible as an MSC logical unit, you must modify BLOCKDEV_LIST.

The blockdev list looks like this:

#define BLOCKDEV_LIST() (                                   \
    NRF_BLOCKDEV_BASE_ADDR(m_block_dev_ram, block_dev),     \
    NRF_BLOCKDEV_BASE_ADDR(m_block_dev_empty, block_dev),   \
    NRF_BLOCKDEV_BASE_ADDR(m_block_dev_qspi, block_dev)     \
)

So if you only want e.g. the QSPI memory, you can change the blockdev list to this:

#define BLOCKDEV_LIST() (                                   \
    NRF_BLOCKDEV_BASE_ADDR(m_block_dev_qspi, block_dev)     \
)

[Mo]

That worked. thanks.

Is there an example (or write up) on how to make the USBD mass-storage to run off of the scheduler?

[Sigurd]

Not specifically. The documentation for the Schedule handling library can be found here. For an example usage of the scheduler, see the implementations of HID Mouse Application and HID Keyboard Application. We have a tutorial here, but it's a bit outdated(SDK 11).