Specialized Device Drivers

All device drivers that are accessible to application logic are either: (1) Character device drivers that can be accessed via the standard driver operations (open(), close(), read(), write(), etc.), or (2) block drivers that can be accessing only as part of mounting a file system or other special use cases as described in the preceding paragraph.

In addition to this, there are also specialized “drivers” that can be used only within the OS logic itself and are not accessible to application logic. These specialized drivers are discussed in the following section.

Note

While special drivers are internal, in some cases there are also character/block drivers that sit on top of these special drivers and thus expose them to applications.

Supported Drivers

• Audio Device Drivers
• Clock management (CLK)
• Device Tree support
• DEVMEM Drivers
• DMA Drivers
• Frame Buffer Drivers
  • Binding
    • Generic LCD Frame Buffer
  • VSYNC
    • VSYNC Offset
  • Examples
    • TTGO T-Display ESP32 board
    • NuttX Simulator
• I2C Device Drivers
• IO Expander Device Drivers
• LCD Character Drivers
  • Binding
    • Generic LCD Character Driver
  • Supported devices
    • LCDs
    • OLEDs
    • Segment LCDS (SLCDs)
  • Examples
    • TTGO T-Display ESP32 board
    • NuttX Simulator
  • LCD Header files
• Memory Technology Device Drivers
  • EEPROM
  • NAND MEMORY
    • Files
    • File Systems
      • NXFFS
      • FAT
      • SMART FS
      • What is Needed
• drivers/regmap
  • Regmap Header files
  • Examples
• Reset Driver
• Remote Proc Tunnel Drivers
• rwbuffer.c
• Sensor Drivers
  • ADXL345
  • ADXL372
  • LSM330_SPI
  • MPL115A
  • Common Sensor Register Interface
  • Sensor Cluster Driver Interface
  • ADT7320
• Segger RTT drivers
  • Segger SystemView
• SPI Device Drivers
• SYSLOG
  • SYSLOG Interfaces
    • Standard SYSLOG Interfaces
    • Debug Interfaces
  • SYSLOG Channels
    • SYSLOG Channel Interfaces
    • SYSLOG Channel Initialization
    • SYSLOG Channel Filtering
    • Interrupt Level SYSLOG Output
  • SYSLOG Channel Options
    • SYSLOG Console Device
    • SYSLOG Character Device
    • SYSLOG File Device
    • SYSLOG RAMLOG Device
  • RAM Logging Device
    • dmesg command
    • RAMLOG Configuration options
• SDIO Device Drivers
• USB Device-Side Drivers
• USB Host-Side Drivers
• USB Miscellaneous Drivers
• USB Monitor support
• Usrsock Driver
• MMCSD Device Drivers
• Network interface drivers
  • Ethernet Device Drivers
• Pinctrl Device Drivers
• FIFO and named pipe drivers
• Power-related Drivers
  • Power Management
    • Interfaces
    • Callbacks
• Virtio Device Drivers
• Video Device Drivers
  • max7456
• Wireless Drivers