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. rwbuffer.c A facility that can be use by any block driver in-order to add writing buffering and read-ahead buffering. Subdirectories of this directory: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ analog/ This directory holds implementations of analog device drivers. This includes drivers for Analog to Digital Conversion (ADC) as well as drivers for Digital to Analog Conversion (DAC). See include/nuttx/analog/*.h for registration information. 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. analog/ This directory holds implementations of input device drivers. This includes such things as touchscreen and keypad drivers. See include/nuttx/input/*.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 pm/ Power management (PM) driver interfaces. These interfaces are used to manage power usage of a platform by monitoring driver activity and by placing drivers into reduce power usage modes when the drivers are not active. sensors/ Drivers for various sensors serial/ Front-end 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 wireless/ Drivers for various wireless devices. 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