This driver blocks on a semaphore to receive notification when an
operation is complete, so requires CONFIG_MULTITHREADING=y.
Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
The Nordic QSPI peripheral uses DMA transfers so data to write must be
located in SRAM. Add a Kconfig that enables copying data from NVMC to
a stack SRAM buffer so it can be written to flash.
Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
Most JEDEC NOR flash devices uses not only typical SPI mode
(MISO,MOSI,SCK and CS), but also QSPI mode (IO0,IO1,IO2,IO3,SCK and CS).
QSPI mode uses more data lines and as a result provide higher
throughput. If this were not enough, Nordic chips provide
hardware acceleration for read/write/erase functions, what
gives significant performance boost.
It does a lot of things "behind the scene", i.e when user has written
some data to the flash and would like to read them back, it has to wait
until the flash is ready by reading WIP bit in Status Register.
This driver does it automatically.
Signed-off-by: Kamil Lazowski <Kamil.Lazowski@nordicsemi.no>
