Open / Close

Collaboration diagram for Open / Close:

Functions
int	edt_close (EdtDev edt_p)
	Shut down all pending I/O operations, closes the device or channel and frees all resources associated with the device handle. More...
EDT_CHECK_RETURN EdtDev	edt_open (const char *device_name, int unit)
	Open the specified EDT board and sets up the device handle. Equivalent to edt_open_device(device_name, unit, channel: 0, verbose: 1). More...
EDT_CHECK_RETURN EdtDev	edt_open_quiet (const char *device_name, int unit)
	Same as edt_open(), but with fewer log messages. Equivalent to edt_open_device(device_name, unit, channel: 0, verbose: 0). More...
EDT_CHECK_RETURN EdtDev	edt_open_channel (const char *device_name, int unit, int channel)
	Open a specific DMA channel on the specified EDT board. Equivalent to edt_open_device(device_name, unit, channel, verbose: 1). More...
EDT_CHECK_RETURN EdtDev	edt_open_device (const char *device_name, int unit, int channel, int verbose)
	Open a specific EDT board and DMA channel. More...
void	edt_set_port (EdtDev edt_p, EdtIOPort port)
	Set the port number, as distinct from the DMA channel. More...
EdtIOPort	edt_get_port (EdtDev edt_p)
	Get the port number set by edt_set_port(). More...

Detailed Description

These functions are used to open and close the EDT device.

Function Documentation

edt_close()

int edt_close

(

EdtDev

edt_p

)

Shut down all pending I/O operations, closes the device or channel and frees all resources associated with the device handle.

Parameters

edt_p

The open EDT device handle.

Returns

0 on success, -1 on failure. If an error occurs, call edt_perror() to get the system error message.

See also

edt_open_device()

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edt_open()

EDT_CHECK_RETURN EdtDev edt_open	(	const char *	device_name,
		int	unit
	)

Open the specified EDT board and sets up the device handle. Equivalent to edt_open_device(device_name, unit, channel: 0, verbose: 1).

Parameters

device_name	Pass EDT_INTERFACE. Open a dummy device for testing by passing "dmy".
unit	Unit number of the device. Unit numbers start at 0.

Returns

The opened EDT device handle if successful, or NULL if unsuccessful. Use edt_perror() to print an error message.

Once opened, the device handle may be used to perform I/O using edt_read(), edt_write(), edt_configure_ring_buffers(), and other input-output library calls. When finished, use edt_close() to release allocated resources.

See also

edt_open_channel(), edt_open_quiet(), edt_close()

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edt_open_quiet()

EDT_CHECK_RETURN EdtDev edt_open_quiet	(	const char *	device_name,
		int	unit
	)

Same as edt_open(), but with fewer log messages. Equivalent to edt_open_device(device_name, unit, channel: 0, verbose: 0).

Parameters

device_name	Pass EDT_INTERFACE. Open a dummy device for testing by passing "dmy".
unit	Unit number of the device. Unit numbers start at 0.

Returns

The opened EDT device handle if successful, or NULL if unsuccessful. Use edt_perror() to print an error message.

Once opened, the device handle may be used to perform I/O using edt_read(), edt_write(), edt_configure_ring_buffers(), and other input-output library calls. When finished, use edt_close() to release allocated resources.

See also

edt_open_channel(), edt_open_quiet(), edt_close()

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edt_open_channel()

EDT_CHECK_RETURN EdtDev edt_open_channel	(	const char *	device_name,
		int	unit,
		int	channel
	)

Open a specific DMA channel on the specified EDT board. Equivalent to edt_open_device(device_name, unit, channel, verbose: 1).

Parameters

device_name	Pass EDT_INTERFACE. Open a dummy device for testing by passing "dmy".
unit	Unit number of the device. Unit numbers start at 0.
channel	DMA channel number, starting from 0.

Returns

The opened EDT device handle if successful, or NULL if unsuccessful. Use edt_perror() to print an error message.

Once opened, the device handle may be used to perform I/O using edt_read(), edt_write(), edt_configure_ring_buffers(), and other input-output library calls. When finished, use edt_close() to release allocated resources.

See also

edt_open_channel(), edt_open_quiet(), edt_close()

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edt_open_device()

EDT_CHECK_RETURN EdtDev edt_open_device	(	const char *	device_name,
		int	unit,
		int	channel,
		int	verbose
	)

Open a specific EDT board and DMA channel.

Parameters

device_name	Pass EDT_INTERFACE. Open a dummy device for testing by passing "dmy".
unit	Unit number of the device. Unit numbers start at 0.
channel	DMA channel number, starting from 0.
verbose	Enable (true / non-zero) messages on successful open, or error messages on failure. Pass false or 0 to disable.

Returns

The opened EDT device handle if successful, or NULL if unsuccessful. Use edt_perror() to print an error message.

Once opened, the device handle may be used to perform I/O using edt_read(), edt_write(), edt_configure_ring_buffers(), and other input-output library calls. When finished, use edt_close() to release allocated resources.

See also

edt_open_channel(), edt_open_quiet(), edt_close()

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edt_set_port()

void edt_set_port	(	EdtDev	edt_p,
		EdtIOPort	port
	)

Set the port number, as distinct from the DMA channel.

Parameters

edt_p	The open EDT device handle.
port	Port number enum.

See also

edt_get_port(), edt_device_channel()

edt_get_port()

EdtIOPort edt_get_port

(

EdtDev

edt_p

)

Get the port number set by edt_set_port().

Parameters

edt_p

The open EDT device handle.

Returns

Port number enum.

Routine to get the "port" number, as distinct from the dma channel