1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/*
* dac02.c
* Comedi driver for DAC02 compatible boards
* Copyright (C) 2014 H Hartley Sweeten <hsweeten@visionengravers.com>
*
* Based on the poc driver
* Copyright (C) 2000 Frank Mori Hess <fmhess@users.sourceforge.net>
* Copyright (C) 2001 David A. Schleef <ds@schleef.org>
*
* COMEDI - Linux Control and Measurement Device Interface
* Copyright (C) 1998 David A. Schleef <ds@schleef.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
/*
* Driver: dac02
* Description: Comedi driver for DAC02 compatible boards
* Devices: (Keithley Metrabyte) DAC-02 [dac02]
* Author: H Hartley Sweeten <hsweeten@visionengravers.com>
* Updated: Tue, 11 Mar 2014 11:27:19 -0700
* Status: unknown
*
* Configuration options:
* [0] - I/O port base
*/
#include <linux/module.h>
#include "../comedidev.h"
/*
* The output range is selected by jumpering pins on the I/O connector.
*
* Range Chan # Jumper pins Output
* ------------- ------ ------------- -----------------
* 0 to 5V 0 21 to 22 24
* 1 15 to 16 18
* 0 to 10V 0 20 to 22 24
* 1 14 to 16 18
* +/-5V 0 21 to 22 23
* 1 15 to 16 17
* +/-10V 0 20 to 22 23
* 1 14 to 16 17
* 4 to 20mA 0 21 to 22 25
* 1 15 to 16 19
* AC reference 0 In on pin 22 24 (2-quadrant)
* In on pin 22 23 (4-quadrant)
* 1 In on pin 16 18 (2-quadrant)
* In on pin 16 17 (4-quadrant)
*/
static const struct comedi_lrange das02_ao_ranges = {
6, {
UNI_RANGE(5),
UNI_RANGE(10),
BIP_RANGE(5),
BIP_RANGE(10),
RANGE_mA(4, 20),
RANGE_ext(0, 1)
}
};
struct dac02_private {
unsigned int ao_readback[2];
};
/*
* Register I/O map
*/
#define DAC02_AO_LSB(x) (0x00 + ((x) * 2))
#define DAC02_AO_MSB(x) (0x01 + ((x) * 2))
static int dac02_ao_insn_write(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
struct dac02_private *devpriv = dev->private;
unsigned int chan = CR_CHAN(insn->chanspec);
unsigned int range = CR_RANGE(insn->chanspec);
unsigned int val;
int i;
for (i = 0; i < insn->n; i++) {
val = data[i];
devpriv->ao_readback[chan] = val;
/*
* Unipolar outputs are true binary encoding.
* Bipolar outputs are complementary offset binary
* (that is, 0 = +full scale, maxdata = -full scale).
*/
if (comedi_range_is_bipolar(s, range))
val = s->maxdata - val;
/*
* DACs are double-buffered.
* Write LSB then MSB to latch output.
*/
outb((val << 4) & 0xf0, dev->iobase + DAC02_AO_LSB(chan));
outb((val >> 4) & 0xff, dev->iobase + DAC02_AO_MSB(chan));
}
return insn->n;
}
static int dac02_ao_insn_read(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
struct dac02_private *devpriv = dev->private;
unsigned int chan = CR_CHAN(insn->chanspec);
int i;
for (i = 0; i < insn->n; i++)
data[i] = devpriv->ao_readback[chan];
return insn->n;
}
static int dac02_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
struct dac02_private *devpriv;
struct comedi_subdevice *s;
int ret;
devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
if (!devpriv)
return -ENOMEM;
ret = comedi_request_region(dev, it->options[0], 0x08);
if (ret)
return ret;
ret = comedi_alloc_subdevices(dev, 1);
if (ret)
return ret;
/* Analog Output subdevice */
s = &dev->subdevices[0];
s->type = COMEDI_SUBD_AO;
s->subdev_flags = SDF_WRITABLE;
s->n_chan = 2;
s->maxdata = 0x0fff;
s->range_table = &das02_ao_ranges;
s->insn_write = dac02_ao_insn_write;
s->insn_read = dac02_ao_insn_read;
return 0;
}
static struct comedi_driver dac02_driver = {
.driver_name = "dac02",
.module = THIS_MODULE,
.attach = dac02_attach,
.detach = comedi_legacy_detach,
};
module_comedi_driver(dac02_driver);
MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>");
MODULE_DESCRIPTION("Comedi driver for DAC02 compatible boards");
MODULE_LICENSE("GPL");
|
