README
^^^^^^
This directory contains various device drivers -- both block and
character drivers as well as other more specialized drivers.
Contents:
- Files in this directory
- Subdirectories of this directory
- Skeleton files
Files in this directory
^^^^^^^^^^^^^^^^^^^^^^^
can.c
An unfinished CAN driver.
dev_null.c and dev_zero.c
These files provide the standard /dev/null and /dev/zero devices.
See include/nuttx/fs.h for functions that should be called if you
want to register these devices (devnull_register() and
devzero_register()).
loop.c
Supports the standard loop device that can be used to export a
file (or character device) as a block device. See losetup() and
loteardown() in include/nuttx/fs.h.
ramdisk.c
Can be used to set up a block of memory or (read-only) FLASH as
a block driver that can be mounted as a files system. See
include/nuttx/ramdisk.h.
Subdirectories of this directory:
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
bch/
Contains logic that may be used to convert a block driver into
a character driver. This is the complementary conversion as that
performed by loop.c. See include/nuttx/fs.h for registration
information.
lcd/
Drivers for parallel and serial LCD and OLED type devices. These
drivers support interfaces as defined in include/nuttx/lcd/lcd.h
mmcsd/
Support for MMC/SD block drivers. MMC/SD block drivers based on
SPI and SDIO/MCI interfaces are supported. See include/nuttx/mmcsd.h
and include/nuttx/sdio.h for further information.
mtd/
Memory Technology Device (MTD) drivers. Some simple drivers for
memory technologies like FLASH, EEPROM, NVRAM, etc. See
include/nuttx/mtd.h
(Note: This is a simple memory interface and should not be
confused with the "real" MTD developed at infradead.org. This
logic is unrelated; I just used the name MTD because I am not
aware of any other common way to refer to this class of devices).
net/
Network interface drivers. See also include/nuttx/net.h
pipes/
FIFO and named pipe drivers. Standard interfaces are declared
in include/unistd.h
serial/
Front-ends character drivers for chip-specific UARTs. This provide
some TTY-like functionality and are commonly used (but not required for)
the NuttX system console. See also include/nuttx/serial.h
usbdev/
USB device drivers. See also include/nuttx/usb/usbdev.h
usbhost/
USB host drivers. See also include/nuttx/usb/usbhost.h
Skeleton Files
^^^^^^^^^^^^^^
Skeleton files a "empty" frameworks for NuttX drivers. They are provided to
give you a good starting point if you want to create a new NuttX driver.
The following skeleton files are available:
drivers/lcd/skeleton.c -- Skeleton LCD driver
drivers/mtd/skeleton.c -- Skeleton memory technology device drivers
drivers/net/skeleton.c -- Skeleton network/Ethernet drivers
drivers/usbhost/usbhost_skeleton.c -- Skeleton USB host class driver
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