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Device Drivers

Device Drivers

Feb 04, 2014

The file system initializes, controls, reads and writes a device using a device driver. A µC/FS device driver has eight interface functions, grouped into a FS_DEV_DRV structure that is registered with the file system (with FS_DevDrvAdd()) as part of application start-up, immediately following FS_Init().

Several restrictions are enforced to preserve the uniqueness of device drivers and simplify management:

  • Each device driver must have a unique name.
  • No driver may be registered more than once.
  • Device drivers cannot be unregistered.
  • All device driver functions must be implemented (even if one or more is ‘empty’).