comedi/drivers/dac02.c

1 // SPDX-License-Identifier: GPL-2.0+
3  * dac02.c
5  * Copyright (C) 2014 H Hartley Sweeten <hsweeten@visionengravers.com>
8  * Copyright (C) 2000 Frank Mori Hess <fmhess@users.sourceforge.net>
9  * Copyright (C) 2001 David A. Schleef <ds@schleef.org>
11  * COMEDI - Linux Control and Measurement Device Interface
12  * Copyright (C) 1998 David A. Schleef <ds@schleef.org>
18  * Devices: [Keithley Metrabyte] DAC-02 (dac02)
20  * Updated: Tue, 11 Mar 2014 11:27:19 -0700
24  *	[0] - I/O port base
34  *	-------------  ------  -------------  -----------------
35  *	   0 to 5V       0        21 to 22      24
37  *	   0 to 10V      0        20 to 22      24
39  *	    +/-5V        0        21 to 22      23
41  *	    +/-10V       0        20 to 22      23
43  *	  4 to 20mA      0        21 to 22      25
45  *	AC reference     0      In on pin 22    24 (2-quadrant)
46  *	                        In on pin 22    23 (4-quadrant)
47  *	                 1      In on pin 16    18 (2-quadrant)
48  *	                        In on pin 16    17 (4-quadrant)
72 	unsigned int chan = CR_CHAN(insn->chanspec);  in dac02_ao_insn_write()
73 	unsigned int range = CR_RANGE(insn->chanspec);  in dac02_ao_insn_write()
77 	for (i = 0; i < insn->n; i++) {  in dac02_ao_insn_write()
80 		s->readback[chan] = val;  in dac02_ao_insn_write()
85 		 * (that is, 0 = +full scale, maxdata = -full scale).  in dac02_ao_insn_write()
88 			val = s->maxdata - val;  in dac02_ao_insn_write()
91 		 * DACs are double-buffered.  in dac02_ao_insn_write()
94 		outb((val << 4) & 0xf0, dev->iobase + DAC02_AO_LSB(chan));  in dac02_ao_insn_write()
95 		outb((val >> 4) & 0xff, dev->iobase + DAC02_AO_MSB(chan));  in dac02_ao_insn_write()
98 	return insn->n;  in dac02_ao_insn_write()
106 	ret = comedi_request_region(dev, it->options[0], 0x08);  in dac02_attach()
115 	s = &dev->subdevices[0];  in dac02_attach()
116 	s->type		= COMEDI_SUBD_AO;  in dac02_attach()
117 	s->subdev_flags	= SDF_WRITABLE;  in dac02_attach()
118 	s->n_chan	= 2;  in dac02_attach()
119 	s->maxdata	= 0x0fff;  in dac02_attach()
120 	s->range_table	= &das02_ao_ranges;  in dac02_attach()
121 	s->insn_write	= dac02_ao_insn_write;  in dac02_attach()