Inheritance diagram for HC_SR04:

Public Member Functions
virtual int	init ()

virtual ssize_t	read (device::file_t filp, char buffer, size_t buflen)
	Perform a read from the device. More...

virtual int	ioctl (device::file_t *filp, int cmd, unsigned long arg)
	Perform an ioctl operation on the device. More...

void	print_info ()
	Diagnostics - print some basic information about the driver.

void	interrupt (unsigned time)

Public Member Functions inherited from cdev::CDev
	CDev (const char *devname)
	Constructor. More...

virtual int	open (file_t *filep)
	Handle an open of the device. More...

virtual int	close (file_t *filep)
	Handle a close of the device. More...

virtual ssize_t	write (file_t filep, const char buffer, size_t buflen)
	Perform a write to the device. More...

virtual off_t	seek (file_t *filep, off_t offset, int whence)
	Perform a logical seek operation on the device. More...

virtual int	poll (file_t filep, px4_pollfd_struct_t fds, bool setup)
	Perform a poll setup/teardown operation. More...

const char *	get_devname () const
	Get the device name. More...

Protected Member Functions
virtual int	probe ()

Protected Member Functions inherited from cdev::CDev
virtual pollevent_t	poll_state (file_t *filep)
	Check the current state of the device for poll events from the perspective of the file. More...

virtual void	poll_notify (pollevent_t events)
	Report new poll events. More...

virtual void	poll_notify_one (px4_pollfd_struct_t *fds, pollevent_t events)
	Internal implementation of poll_notify. More...

virtual int	open_first (file_t *filep)
	Notification of the first open. More...

virtual int	close_last (file_t *filep)
	Notification of the last close. More...

virtual int	register_class_devname (const char *class_devname)
	Register a class device name, automatically adding device class instance suffix if need be. More...

virtual int	unregister_class_devname (const char *class_devname, unsigned class_instance)
	Register a class device name, automatically adding device class instance suffix if need be. More...

void	lock ()
	Take the driver lock. More...

void	unlock ()
	Release the driver lock.

Additional Inherited Members
Protected Attributes inherited from cdev::CDev
px4_sem_t	_lock
	lock to protect access to all class members (also for derived classes)

Static Protected Attributes inherited from cdev::CDev
static const px4_file_operations_t	fops = {}
	Pointer to the default cdev file operations table; useful for registering clone devices etc.

Member Function Documentation

§ ioctl()

int HC_SR04::ioctl	(	device::file_t *	filep,
		int	cmd,
		unsigned long	arg
	)

virtual

Perform an ioctl operation on the device.

The default implementation handles DIOC_GETPRIV, and otherwise returns -ENOTTY. Subclasses should call the default implementation for any command they do not handle themselves.

Parameters

filep	Pointer to the NuttX file structure.
cmd	The ioctl command value.
arg	The ioctl argument value.

Returns: OK on success, or -errno otherwise.

Reimplemented from cdev::CDev.

§ read()

ssize_t HC_SR04::read	(	device::file_t *	filep,
		char *	buffer,
		size_t	buflen
	)

virtual

Perform a read from the device.

The default implementation returns -ENOSYS.

Parameters

filep	Pointer to the NuttX file structure.
buffer	Pointer to the buffer into which data should be placed.
buflen	The number of bytes to be read.

Returns: The number of bytes read or -errno otherwise.

Reimplemented from cdev::CDev.

The documentation for this class was generated from the following file:

src/drivers/distance_sensor/hc_sr04/hc_sr04.cpp

Public Member Functions

Protected Member Functions

Additional Inherited Members

Member Function Documentation

§ ioctl()

§ read()