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5.2.2 CR_PACK_FLAGS
CR_PACK_FLAGS(chan, range, aref, flags) is similar to CR_PACK() but can be used to combine one or more flag bits
(bitwise-ORed together in the flags parameter) with the other parameters.
#define CR_PACK_FLAGS(chan, range, aref, flags) \
(CR_PACK(chan, range, aref) | ((flags) & CR_FLAGS_MASK))
Depending on context, the chan parameter might not be a channel; it could be a trigger source, clock source, gate source etc.
(in which case, the range and aref parameters would probably be set to 0), and the flags would modify the source in some
device-dependant way.
The following flag values are defined:
CR_ALT_FILTER, CR_DITHER, CR_DEGLITCH (all the same) specify that some sort of filtering is to be done on the channel,
trigger source, etc.
CR_ALT_SOURCE specifies that some alternate source is to be used for the channel (usually a calibration source).
CR_EDGE is usually combined with a trigger source number to specify that the trigger source is edge-triggered if the hardware
and driver supports both edge-triggering and level-triggering. If both are supported, not asserting this flag specifies level-
triggering.
CR_INVERT specifies that the trigger source, gate source, etc. is to be inverted.
5.2.3 RANGE_LENGTH (deprecated)
Rangetype values are library-internal tokens that represent an array of range information structures. These numbers are primarily
used for communication between the kernel and library.
The RANGE_LENGTH(rangetype) macro returns the length of the array that is specified by the rangetype token.
The RANGE_LENGTH() macro is deprecated, and should not be used in new applications. It is scheduled to be removed from the
header file at version 1.0. Binary compatibility may be broken for version 1.1.
5.2.4 enum comedi_conversion_direction
enum comedi_conversion_direction
{
COMEDI_TO_PHYSICAL,
COMEDI_FROM_PHYSICAL
};
A comedi_conversion_direction is used to choose between converting data from Comedi’s integer sample values to a physical
value (COMEDI_TO_PHYSICAL), and converting from a physical value to Comedi’s integer sample values (COMEDI_FROM-
_PHYSICAL).
5.2.5 enum comedi_io_direction
enum comedi_io_direction
{
COMEDI_INPUT,
COMEDI_OUTPUT
};
A comedi_io_direction is used to select between input or output. For example, comedi_dio_config() uses the COMEDI_-
INPUT and COMEDI_OUTPUT values to specify whether a configurable digital i/o channel should be configured as an input or
output.
- Contents 3
- List of Figures 11
- 1 Overview 12
- 1.4 DAQ signals 13
- 1.5 Device hierarchy 14
- 1.6 Acquisition terminology 14
- 1.7 DAQ functions 15
- 1.8 Supporting functionality 15
- 2 Configuration 16
- 3 Writing Comedi programs 19
- 10 / 148 21
- 3.4 Asynchronous acquisition 22
- 12 / 148 23
- 13 / 148 24
- 3.5 Further examples 25
- 15 / 148 26
- 16 / 148 27
- 17 / 148 28
- 4.2.2 Instruction execution 28
- 18 / 148 29
- 19 / 148 30
- 4.5.1 Executing a command 30
- 20 / 148 31
- 21 / 148 32
- 4.5.4 The command flags 32
- 4.6 Slowly-varying inputs 33
- 23 / 148 34
- 24 / 148 35
- 4.7.4 Extended Triggering 35
- 25 / 148 36
- 4.7.5 Analog Triggering 36
- 26 / 148 37
- 4.7.7 Counter configuration 37
- 27 / 148 38
- 28 / 148 39
- 29 / 148 40
- 30 / 148 41
- 5 Comedi reference 42
- 32 / 148 43
- 5.2.2 CR_PACK_FLAGS 43
- 5.3 Data types and structures 44
- 35 / 148 46
- 5.3.7 comedi_cmd 46
- 5.3.8 comedi_insn 46
- 36 / 148 47
- 5.3.9 comedi_range 47
- 5.3.10 comedi_krange 47
- 5.4 Functions 48
- 45 / 148 56
- Synopsis 56
- Description 56
- 5.5 Kernel drivers 84
- 74 / 148 85
- 75 / 148 86
- 76 / 148 87
- 77 / 148 88
- MicroAxial ADQ12-B adq12b 89
- 79 / 148 90
- 80 / 148 91
- 81 / 148 92
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- 86 / 148 97
- 87 / 148 98
- 88 / 148 99
- 89 / 148 100
- 90 / 148 101
- 91 / 148 102
- 92 / 148 103
- 93 / 148 104
- Status: works 105
- Manufacturer Device Name 105
- 95 / 148 106
- Author: ds, fmhess 107
- 97 / 148 108
- 98 / 148 109
- 99 / 148 110
- 100 / 148 111
- 101 / 148 112
- 102 / 148 113
- 103 / 148 114
- 104 / 148 115
- Status: complete 116
- 106 / 148 117
- 107 / 148 118
- 108 / 148 119
- 5.5.51 fl512 -- unknown 119
- 109 / 148 120
- 110 / 148 121
- 111 / 148 122
- 112 / 148 123
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- 116 / 148 127
- 117 / 148 128
- 119 / 148 130
- 120 / 148 131
- 121 / 148 132
- 122 / 148 133
- 123 / 148 134
- 124 / 148 135
- 125 / 148 136
- Advantech PCL-816 pcl816 137
- 127 / 148 138
- 128 / 148 139
- 129 / 148 140
- 5.5.88 pcm3730 -- PCM3730 140
- 130 / 148 141
- Winsystems PCM-MIO pcmmio 142
- 133 / 148 144
- 134 / 148 145
- 135 / 148 146
- 136 / 148 147
- 137 / 148 148
- Status: stable 149
- ITL USB-DUX-FAST usbduxfast 149
- Status: Stable 150
- ITL USB-DUX-SIGMA usbduxsigma 150
- 6 Writing a Comedi driver 151
- 6.2 Generic functionality 152
- 142 / 148 153
- 6.2.1.1 comedi_lrange 153
- 6.2.1.2 comedi_subdevice 153
- 143 / 148 154
- 6.2.1.3 comedi_device 154
- 6.2.1.4 comedi_async 154
- 144 / 148 155
- 6.2.1.5 comedi_driver 155
- 145 / 148 156
- 146 / 148 157
- 7 Glossary 158
- 148 / 148 159
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