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};
The function pointers insn_read . . . cancel . offer (pointers to) the standardized user-visible API that every subdevice should
offer; every device driver has to fill in these functions with their board-specific implementations. (Functionality for which Comedi
provides generic functions will, by definition, not show up in the device driver data structures.)
The buf_change and munge function pointers offer functionality that is not visible to the user and for which the device driver
writer must provide a board-specific implementation: buf_change() is called when a change in the data buffer requires han-
dling; munge() transforms different bit-representations of DAQ values, for example from unsigned to 2’s complement.
6.2.1.3 comedi_device
The last data structure stores the information at the device level:
struct comedi_device_struct{
int use_count;
comedi_driver
*
driver;
void
*
private;
kdev_t minor;
char
*
board_name;
const void
*
board_ptr;
int attached;
int rt;
spinlock_t spinlock;
int in_request_module;
int n_subdevices;
comedi_subdevice
*
subdevices;
int options[COMEDI_NDEVCONFOPTS];
/
*
dumb
*
/
int iobase;
int irq;
comedi_subdevice
*
read_subdev;
wait_queue_head_t read_wait;
comedi_subdevice
*
write_subdev;
wait_queue_head_t write_wait;
struct fasync_struct
*
async_queue;
void (
*
open)(comedi_device
*
dev);
void (
*
close)(comedi_device
*
dev);
};
6.2.1.4 comedi_async
The following data structure contains all relevant information: addresses and sizes of buffers, pointers to the actual data, and the
information needed for event handling:
struct comedi_async_struct{
void
*
prealloc_buf; /
*
pre-allocated buffer
*
/
unsigned int prealloc_bufsz; /
*
buffer size, in bytes
*
/
unsigned long
*
buf_page_list; /
*
physical address of each page
*
/
unsigned int max_bufsize; /
*
maximum buffer size, bytes
*
/
unsigned int mmap_count; /
*
current number of mmaps of prealloc_buf
*
/
volatile unsigned int buf_write_count; /
*
byte count for writer (write completed)
*
/
- 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
- 83 / 148 94
- 84 / 148 95
- 85 / 148 96
- 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
- 113 / 148 124
- 114 / 148 125
- 115 / 148 126
- 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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