comedi_get_subdevice_flags — properties of subdevice
#include <comedilib.h>
int comedi_get_subdevice_flags( | comedi_t * device, |
unsigned int subdevice); |
The function comedi_get_subdevice_flags
returns a bitfield describing the capabilities of
the specified subdevice subdevice
of the Comedi device device.
If there is an error, -1 is returned,
and the Comedilib error value is set.
| Subdevice Flag | Value (hex) | Description |
|---|---|---|
SDF_BUSY | 0x00000001 | The subdevice is busy performing an asynchronous command.
A subdevice being “busy”
is slightly different from the “running” state flagged by
SDF_RUNNING. A “running” subdevice
is always “busy”, but a “busy” subdevice is
not necessarily “running”. For example, suppose an
analog input command has been completed by the hardware, but there are still samples in
Comedi's buffer waiting to be read out. In this case, the subdevice is not
“running”, but is still “busy” until all the
samples are read out or comedi_cancel is called. |
SDF_BUSY_OWNER | 0x00000002 | The subdevice is “busy”, and the command it is running was started by the current process. |
SDF_LOCKED | 0x00000004 | The subdevice has been locked by comedi_lock. |
SDF_LOCK_OWNER | 0x00000008 | The subdevice is locked, and was locked by the current process. |
SDF_MAXDATA | 0x00000010 | The maximum data value for the subdevice depends on the channel. |
SDF_FLAGS | 0x00000020 | The subdevice flags depend on the channel (unfinished/broken support in library). |
SDF_RANGETYPE | 0x00000040 | The range type depends on the channel. |
SDF_CMD | 0x00001000 | The subdevice supports asynchronous commands. |
SDF_SOFT_CALIBRATED | 0x00002000 | The subdevice relies on the host to do calibration in software.
Software calibration coefficients are determined by the comedi_soft_calibrate
utility. See the description of the
comedi_get_softcal_converter function
for more information.
|
SDF_READABLE | 0x00010000 | The subdevice can be read (e.g. analog input). |
SDF_WRITABLE | 0x00020000 | The subdevice can be written to (e.g. analog output). |
SDF_INTERNAL | 0x00040000 | The subdevice does not have externally visible lines. |
SDF_GROUND | 0x00100000 | The subdevice supports analog reference AREF_GROUND. |
SDF_COMMON | 0x00200000 | The subdevice supports analog reference AREF_COMMON. |
SDF_DIFF | 0x00400000 | The subdevice supports analog reference AREF_DIFF. |
SDF_OTHER | 0x00800000 | The subdevice supports analog reference AREF_OTHER |
SDF_DITHER | 0x01000000 | The subdevice supports dithering (via the CR_ALT_FILTER chanspec flag). |
SDF_DEGLITCH | 0x02000000 | The subdevice supports deglitching (via the CR_ALT_FILTER chanspec flag). |
SDF_RUNNING | 0x08000000 | An asynchronous command is running. You can use this flag to poll for the completion of an output command. |
SDF_LSAMPL | 0x10000000 | The subdevice uses the 32-bit lsampl_t type instead of the 16-bit sampl_t for asynchronous command data. |
SDF_PACKED | 0x20000000 | The subdevice uses bitfield samples for asynchronous command data, one bit per channel (otherwise it uses one sampl_t or lsampl_t per channel). Commonly used for digital subdevices. |