Loading...
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 | /*
comedi/drivers/mpc624.c
Hardware driver for a Micro/sys inc. MPC-624 PC/104 board
COMEDI - Linux Control and Measurement Device Interface
Copyright (C) 2000 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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
Driver: mpc624
Description: Micro/sys MPC-624 PC/104 board
Devices: [Micro/sys] MPC-624 (mpc624)
Author: Stanislaw Raczynski <sraczynski@op.pl>
Updated: Thu, 15 Sep 2005 12:01:18 +0200
Status: working
The Micro/sys MPC-624 board is based on the LTC2440 24-bit sigma-delta
ADC chip.
Subdevices supported by the driver:
- Analog In: supported
- Digital I/O: not supported
- LEDs: not supported
- EEPROM: not supported
Configuration Options:
[0] - I/O base address
[1] - convertion rate
Convertion rate RMS noise Effective Number Of Bits
0 3.52kHz 23uV 17
1 1.76kHz 3.5uV 20
2 880Hz 2uV 21.3
3 440Hz 1.4uV 21.8
4 220Hz 1uV 22.4
5 110Hz 750uV 22.9
6 55Hz 510nV 23.4
7 27.5Hz 375nV 24
8 13.75Hz 250nV 24.4
9 6.875Hz 200nV 24.6
[2] - voltage range
0 -1.01V .. +1.01V
1 -10.1V .. +10.1V
*/
#include "../comedidev.h"
#include <linux/ioport.h>
#include <linux/delay.h>
/* Consecutive I/O port addresses */
#define MPC624_SIZE 16
/* Offsets of different ports */
#define MPC624_MASTER_CONTROL 0 /* not used */
#define MPC624_GNMUXCH 1 /* Gain, Mux, Channel of ADC */
#define MPC624_ADC 2 /* read/write to/from ADC */
#define MPC624_EE 3 /* read/write to/from serial EEPROM via I2C */
#define MPC624_LEDS 4 /* write to LEDs */
#define MPC624_DIO 5 /* read/write to/from digital I/O ports */
#define MPC624_IRQ_MASK 6 /* IRQ masking enable/disable */
/* Register bits' names */
#define MPC624_ADBUSY (1<<5)
#define MPC624_ADSDO (1<<4)
#define MPC624_ADFO (1<<3)
#define MPC624_ADCS (1<<2)
#define MPC624_ADSCK (1<<1)
#define MPC624_ADSDI (1<<0)
/* SDI Speed/Resolution Programming bits */
#define MPC624_OSR4 (1<<31)
#define MPC624_OSR3 (1<<30)
#define MPC624_OSR2 (1<<29)
#define MPC624_OSR1 (1<<28)
#define MPC624_OSR0 (1<<27)
/* 32-bit output value bits' names */
#define MPC624_EOC_BIT (1<<31)
#define MPC624_DMY_BIT (1<<30)
#define MPC624_SGN_BIT (1<<29)
/* Convertion speeds */
/* OSR4 OSR3 OSR2 OSR1 OSR0 Convertion rate RMS noise ENOB^
* X 0 0 0 1 3.52kHz 23uV 17
* X 0 0 1 0 1.76kHz 3.5uV 20
* X 0 0 1 1 880Hz 2uV 21.3
* X 0 1 0 0 440Hz 1.4uV 21.8
* X 0 1 0 1 220Hz 1uV 22.4
* X 0 1 1 0 110Hz 750uV 22.9
* X 0 1 1 1 55Hz 510nV 23.4
* X 1 0 0 0 27.5Hz 375nV 24
* X 1 0 0 1 13.75Hz 250nV 24.4
* X 1 1 1 1 6.875Hz 200nV 24.6
*
* ^ - Effective Number Of Bits
*/
#define MPC624_SPEED_3_52_kHz (MPC624_OSR4 | MPC624_OSR0)
#define MPC624_SPEED_1_76_kHz (MPC624_OSR4 | MPC624_OSR1)
#define MPC624_SPEED_880_Hz (MPC624_OSR4 | MPC624_OSR1 | MPC624_OSR0)
#define MPC624_SPEED_440_Hz (MPC624_OSR4 | MPC624_OSR2)
#define MPC624_SPEED_220_Hz (MPC624_OSR4 | MPC624_OSR2 | MPC624_OSR0)
#define MPC624_SPEED_110_Hz (MPC624_OSR4 | MPC624_OSR2 | MPC624_OSR1)
#define MPC624_SPEED_55_Hz \
(MPC624_OSR4 | MPC624_OSR2 | MPC624_OSR1 | MPC624_OSR0)
#define MPC624_SPEED_27_5_Hz (MPC624_OSR4 | MPC624_OSR3)
#define MPC624_SPEED_13_75_Hz (MPC624_OSR4 | MPC624_OSR3 | MPC624_OSR0)
#define MPC624_SPEED_6_875_Hz \
(MPC624_OSR4 | MPC624_OSR3 | MPC624_OSR2 | MPC624_OSR1 | MPC624_OSR0)
/* -------------------------------------------------------------------------- */
struct skel_private {
/* set by mpc624_attach() from driver's parameters */
unsigned long int ulConvertionRate;
};
#define devpriv ((struct skel_private *)dev->private)
/* -------------------------------------------------------------------------- */
static const struct comedi_lrange range_mpc624_bipolar1 = {
1,
{
/* BIP_RANGE(1.01) this is correct, */
/* but my MPC-624 actually seems to have a range of 2.02 */
BIP_RANGE(2.02)
}
};
static const struct comedi_lrange range_mpc624_bipolar10 = {
1,
{
/* BIP_RANGE(10.1) this is correct, */
/* but my MPC-624 actually seems to have a range of 20.2 */
BIP_RANGE(20.2)
}
};
/* -------------------------------------------------------------------------- */
static int mpc624_attach(struct comedi_device *dev,
struct comedi_devconfig *it);
static int mpc624_detach(struct comedi_device *dev);
/* -------------------------------------------------------------------------- */
static struct comedi_driver driver_mpc624 = {
.driver_name = "mpc624",
.module = THIS_MODULE,
.attach = mpc624_attach,
.detach = mpc624_detach
};
/* -------------------------------------------------------------------------- */
static int mpc624_ai_rinsn(struct comedi_device *dev,
struct comedi_subdevice *s, struct comedi_insn *insn,
unsigned int *data);
/* -------------------------------------------------------------------------- */
static int mpc624_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
struct comedi_subdevice *s;
unsigned long iobase;
iobase = it->options[0];
printk(KERN_INFO "comedi%d: mpc624 [0x%04lx, ", dev->minor, iobase);
if (request_region(iobase, MPC624_SIZE, "mpc624") == NULL) {
printk(KERN_ERR "I/O port(s) in use\n");
return -EIO;
}
dev->iobase = iobase;
dev->board_name = "mpc624";
/* Private structure initialization */
if (alloc_private(dev, sizeof(struct skel_private)) < 0)
return -ENOMEM;
switch (it->options[1]) {
case 0:
devpriv->ulConvertionRate = MPC624_SPEED_3_52_kHz;
printk(KERN_INFO "3.52 kHz, ");
break;
case 1:
devpriv->ulConvertionRate = MPC624_SPEED_1_76_kHz;
printk(KERN_INFO "1.76 kHz, ");
break;
case 2:
devpriv->ulConvertionRate = MPC624_SPEED_880_Hz;
printk(KERN_INFO "880 Hz, ");
break;
case 3:
devpriv->ulConvertionRate = MPC624_SPEED_440_Hz;
printk(KERN_INFO "440 Hz, ");
break;
case 4:
devpriv->ulConvertionRate = MPC624_SPEED_220_Hz;
printk(KERN_INFO "220 Hz, ");
break;
case 5:
devpriv->ulConvertionRate = MPC624_SPEED_110_Hz;
printk(KERN_INFO "110 Hz, ");
break;
case 6:
devpriv->ulConvertionRate = MPC624_SPEED_55_Hz;
printk(KERN_INFO "55 Hz, ");
break;
case 7:
devpriv->ulConvertionRate = MPC624_SPEED_27_5_Hz;
printk(KERN_INFO "27.5 Hz, ");
break;
case 8:
devpriv->ulConvertionRate = MPC624_SPEED_13_75_Hz;
printk(KERN_INFO "13.75 Hz, ");
break;
case 9:
devpriv->ulConvertionRate = MPC624_SPEED_6_875_Hz;
printk(KERN_INFO "6.875 Hz, ");
break;
default:
printk
(KERN_ERR "illegal convertion rate setting!"
" Valid numbers are 0..9. Using 9 => 6.875 Hz, ");
devpriv->ulConvertionRate = MPC624_SPEED_3_52_kHz;
}
/* Subdevices structures */
if (alloc_subdevices(dev, 1) < 0)
return -ENOMEM;
s = dev->subdevices + 0;
s->type = COMEDI_SUBD_AI;
s->subdev_flags = SDF_READABLE | SDF_DIFF;
s->n_chan = 8;
switch (it->options[1]) {
default:
s->maxdata = 0x3FFFFFFF;
printk(KERN_INFO "30 bit, ");
}
switch (it->options[1]) {
case 0:
s->range_table = &range_mpc624_bipolar1;
printk(KERN_INFO "1.01V]: ");
break;
default:
s->range_table = &range_mpc624_bipolar10;
printk(KERN_INFO "10.1V]: ");
}
s->len_chanlist = 1;
s->insn_read = mpc624_ai_rinsn;
printk(KERN_INFO "attached\n");
return 1;
}
static int mpc624_detach(struct comedi_device *dev)
{
printk(KERN_INFO "comedi%d: mpc624: remove\n", dev->minor);
if (dev->iobase)
release_region(dev->iobase, MPC624_SIZE);
return 0;
}
/* Timeout 200ms */
#define TIMEOUT 200
static int mpc624_ai_rinsn(struct comedi_device *dev,
struct comedi_subdevice *s, struct comedi_insn *insn,
unsigned int *data)
{
int n, i;
unsigned long int data_in, data_out;
unsigned char ucPort;
/*
* WARNING:
* We always write 0 to GNSWA bit, so the channel range is +-/10.1Vdc
*/
outb(insn->chanspec, dev->iobase + MPC624_GNMUXCH);
/* printk("Channel %d:\n", insn->chanspec); */
if (!insn->n) {
printk(KERN_INFO "MPC624: Warning, no data to acquire\n");
return 0;
}
for (n = 0; n < insn->n; n++) {
/* Trigger the convertion */
outb(MPC624_ADSCK, dev->iobase + MPC624_ADC);
udelay(1);
outb(MPC624_ADCS | MPC624_ADSCK, dev->iobase + MPC624_ADC);
udelay(1);
outb(0, dev->iobase + MPC624_ADC);
udelay(1);
/* Wait for the convertion to end */
for (i = 0; i < TIMEOUT; i++) {
ucPort = inb(dev->iobase + MPC624_ADC);
if (ucPort & MPC624_ADBUSY)
udelay(1000);
else
break;
}
if (i == TIMEOUT) {
printk(KERN_ERR "MPC624: timeout (%dms)\n", TIMEOUT);
data[n] = 0;
return -ETIMEDOUT;
}
/* Start reading data */
data_in = 0;
data_out = devpriv->ulConvertionRate;
udelay(1);
for (i = 0; i < 32; i++) {
/* Set the clock low */
outb(0, dev->iobase + MPC624_ADC);
udelay(1);
if (data_out & (1 << 31)) { /* the next bit is a 1 */
/* Set the ADSDI line (send to MPC624) */
outb(MPC624_ADSDI, dev->iobase + MPC624_ADC);
udelay(1);
/* Set the clock high */
outb(MPC624_ADSCK | MPC624_ADSDI,
dev->iobase + MPC624_ADC);
} else { /* the next bit is a 0 */
/* Set the ADSDI line (send to MPC624) */
outb(0, dev->iobase + MPC624_ADC);
udelay(1);
/* Set the clock high */
outb(MPC624_ADSCK, dev->iobase + MPC624_ADC);
}
/* Read ADSDO on high clock (receive from MPC624) */
udelay(1);
data_in <<= 1;
data_in |=
(inb(dev->iobase + MPC624_ADC) & MPC624_ADSDO) >> 4;
udelay(1);
data_out <<= 1;
}
/*
* Received 32-bit long value consist of:
* 31: EOC -
* (End Of Transmission) bit - should be 0
* 30: DMY
* (Dummy) bit - should be 0
* 29: SIG
* (Sign) bit- 1 if the voltage is positive,
* 0 if negative
* 28: MSB
* (Most Significant Bit) - the first bit of
* the conversion result
* ....
* 05: LSB
* (Least Significant Bit)- the last bit of the
* conversion result
* 04-00: sub-LSB
* - sub-LSBs are basically noise, but when
* averaged properly, they can increase conversion
* precision up to 29 bits; they can be discarded
* without loss of resolution.
*/
if (data_in & MPC624_EOC_BIT)
printk(KERN_INFO "MPC624:EOC bit is set (data_in=%lu)!",
data_in);
if (data_in & MPC624_DMY_BIT)
printk(KERN_INFO "MPC624:DMY bit is set (data_in=%lu)!",
data_in);
if (data_in & MPC624_SGN_BIT) { /* Volatge is positive */
/*
* comedi operates on unsigned numbers, so mask off EOC
* and DMY and don't clear the SGN bit
*/
data_in &= 0x3FFFFFFF;
data[n] = data_in;
} else { /* The voltage is negative */
/*
* data_in contains a number in 30-bit two's complement
* code and we must deal with it
*/
data_in |= MPC624_SGN_BIT;
data_in = ~data_in;
data_in += 1;
data_in &= ~(MPC624_EOC_BIT | MPC624_DMY_BIT);
/* clear EOC and DMY bits */
data_in = 0x20000000 - data_in;
data[n] = data_in;
}
}
/* Return the number of samples read/written */
return n;
}
COMEDI_INITCLEANUP(driver_mpc624);
|