Advantech PCI-1736UP Specifikace Strana 26
- Strana / 159
- Tabulka s obsahem
- KNIHY
Hodnocené. / 5. Na základě hodnocení zákazníků
Comedi
15 / 148
int comedi_dio_bitfield2(comedi_t *device, unsigned int subdevice, unsigned int write_mask, unsigned int *bits, unsigned int
base_channel);
Each channel from base_channel to base_channel + 31 is assigned to a bit in the write_mask and bits bitfield with bit
0 assigned to channel base_channel, bit 1 assigned to channel base_channel + 1, etc. If a bit in write_mask is set, the
corresponding bit in
*
bits will be written to the digital output line corresponding to the channel given by base_channel plus
the bit number. Each digital line is then read and placed into
*
bits. The value of bits in
*
bits corresponding to digital output
lines is undefined and device-specific. Channel base_channel + 0 is the least significant bit in the bitfield. No more than 32
channels at once can be accessed using this method. Warning! Older versions of Comedi may ignore base_channel and treat
it as 0 unless the subdevice has more than 32 channels.
The digital acquisition functions seem to be very simple, but, behind the implementation screens of the Comedi kernel module,
they are executed as special cases of the general instruction command.
4.1.2 Single analog acquisition
Analog Comedi channels can produce data values that are samples from continuous analog signals. These samples are integers
with a significant content in the range of, typically, 8, 10, 12, or 16 bits.
Single samples can be read from an analog channel using the function comedi_data_read():
int comedi_data_read(comedi_t *device, unsigned int subdevice, unsigned int channel, unsigned int range, unsigned int aref,
lsampl_t *data);
This reads one such data value from a Comedi channel, and puts it in the user-specified data buffer.
The range parameter is the zero-based index of one of the gain ranges supported by the channel. This is a number from 0 to N-1
where N is the number of ranges supported by the channel. Use the function comedi_get_n_ranges() to get the number of
ranges supported by the channel, the function comedi_find_range() to search for a suitable range, or the function comed-
i_get_range() to get the details of a supported range.
The aref parameter specifies an analog reference to use: AREF_GROUND, AREF_COMMON, AREF_DIFF, or AREF_OTHER.
Use the function comedi_get_subdevice_flags() to see which analog references are supported by the subdevice.
In the opposite direction, single samples can be written to an analog output channel using the function comedi_data_writ-
e():
int comedi_data_write(comedi_t *device, unsigned int subdevice, unsigned int channel, unsigned int range, unsigned int aref,
lsampl_t data);
Raw data values read or written by the above functions are unsigned integers less than, or equal to, the maximum sample value
of the channel, which can be determined using the function comedi_get_maxdata():
lsampl_t comedi_get_maxdata(comedi_t *device, unsigned int subdevice, unsigned int channel);
Conversion between raw data values and uncalibrated physical units can be performed by the functions comedi_to_phys()
and comedi_from_phys():
double comedi_to_phys(lsampl_t data, comedi_range *range, lsampl_t maxdata);
lsampl_t comedi_from_phys(double data, comedi_range *range, lsampl_t maxdata);
There are some data structures in these commands that are not fully self-explanatory:
• comedi_t: this data structure contains all information that a user program has to know about an open Comedi device. The
programmer doesn’t have to fill in this data structure manually: it gets filled in by opening the device.
• lsampl_t: this ‘data structure’ represents one single sample. On most architectures, it’s nothing more than a 32 bits value.
Internally, Comedi does some conversion from raw sample data to ‘correct’ integers. This is called ‘data munging’.
• comedi_range: this holds the minimum and maximum physical values for a gain range supported by a channel of a subdevice,
and specifies the units. This can be used in combination with the channel’s ‘maxdata’ value to convert between unsigned
integer sample values (of type lsampl_t or sampl_t) and physical units in a nominal (uncalibrated) way using the comedi_t-
o_phys() and comedi_from_phys() functions. Use the comedi_get_maxdata() function to get the ‘maxdata’ value
for the channel.
- 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
- 82 / 148 93
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- 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
Související produkty a manuály pro Software Advantech PCI-1736UP
Software Advantech PCM-3350 Specifikace
(19 stránky)
(19 stránky)
Sony CDX-L280 manuales
Manuales del propietario y guías del usuario para Receptores de medios de coches Sony CDX-L280.
Ofrecemos 1 manuales en pdf Sony CDX-L280 para descargar gratis por tipos de documentos: Manual de usuario
Sony CDX-L280 Manual de usuario (92 paginas)
Marca: Sony | Categoria: Car media receivers | Tamaño: 0.78 MB |
Tabla de contenidos
Additional
15
Information
15
Willkommen!
20
CD-Player
21
CDX-L280
22
Radiosender
29
Meldungen
37
(en option)
41
Précautions
42
Préparation
43
Lecteur CD
45
Mémorisation
47
Informations
51
Dépannage
54
Benvenuti !
56
Lettore CD
57
(opzionale)
59
Precauzioni
60
Operazioni
61
Informazioni
69
Rimozione
70
Messaggi
73
Welkom !
74
Aan de slag
75
CD-speler
75
Geräte-Pass
92
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