--- /dev/null
+/*
+ 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.o
+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 <linux/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)
+//----------------------------------------------------------------------------
+typedef struct
+{
+ unsigned long int ulConvertionRate; // set by mpc624_attach() from driver's parameters
+} skel_private;
+
+#define devpriv ((skel_private *)dev->private)
+//----------------------------------------------------------------------------
+static 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 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(comedi_device *dev,comedi_devconfig *it);
+static int mpc624_detach(comedi_device *dev);
+//----------------------------------------------------------------------------
+static comedi_driver driver_mpc624 =
+{
+ driver_name: "mpc624",
+ module: THIS_MODULE,
+ attach: mpc624_attach,
+ detach: mpc624_detach
+};
+//----------------------------------------------------------------------------
+static int mpc624_ai_rinsn(comedi_device *dev, comedi_subdevice *s, comedi_insn *insn,
+ lsampl_t *data);
+//----------------------------------------------------------------------------
+static int mpc624_attach(comedi_device *dev, comedi_devconfig *it)
+{
+ comedi_subdevice *s;
+ int iobase;
+
+ iobase = it->options[0];
+ rt_printk("comedi%d: mpc624 [0x%04x, ", dev->minor, iobase);
+ if(request_region(iobase, MPC624_SIZE, "mpc624") == NULL)
+ {
+ rt_printk("I/O port(s) in use\n");
+ return -EIO;
+ }
+
+ dev->iobase = iobase;
+ dev->board_name = "mpc624";
+
+ // Private structure initialization
+ if(alloc_private(dev, sizeof(skel_private)) < 0)
+ return -ENOMEM;
+
+ switch(it->options[1])
+ {
+ case 0:
+ devpriv->ulConvertionRate = MPC624_SPEED_3_52_kHz;
+ rt_printk("3.52 kHz, ");
+ break;
+ case 1:
+ devpriv->ulConvertionRate = MPC624_SPEED_1_76_kHz;
+ rt_printk("1.76 kHz, ");
+ break;
+ case 2:
+ devpriv->ulConvertionRate = MPC624_SPEED_880_Hz;
+ rt_printk("880 Hz, ");
+ break;
+ case 3:
+ devpriv->ulConvertionRate = MPC624_SPEED_440_Hz;
+ rt_printk("440 Hz, ");
+ break;
+ case 4:
+ devpriv->ulConvertionRate = MPC624_SPEED_220_Hz;
+ rt_printk("220 Hz, ");
+ break;
+ case 5:
+ devpriv->ulConvertionRate = MPC624_SPEED_110_Hz;
+ rt_printk("110 Hz, ");
+ break;
+ case 6:
+ devpriv->ulConvertionRate = MPC624_SPEED_55_Hz;
+ rt_printk("55 Hz, ");
+ break;
+ case 7:
+ devpriv->ulConvertionRate = MPC624_SPEED_27_5_Hz;
+ rt_printk("27.5 Hz, ");
+ break;
+ case 8:
+ devpriv->ulConvertionRate = MPC624_SPEED_13_75_Hz;
+ rt_printk("13.75 Hz, ");
+ break;
+ case 9:
+ devpriv->ulConvertionRate = MPC624_SPEED_6_875_Hz;
+ rt_printk("6.875 Hz, ");
+ break;
+ default:
+ rt_printk("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;
+ rt_printk("30 bit, ");
+ }
+
+ switch(it->options[1])
+ {
+ case 0:
+ s->range_table=&range_mpc624_bipolar1;
+ rt_printk("1.01V]: ");
+ break;
+ default:
+ s->range_table=&range_mpc624_bipolar10;
+ rt_printk("10.1V]: ");
+ }
+ s->len_chanlist=1;
+ s->insn_read = mpc624_ai_rinsn;
+
+ rt_printk("attached\n");
+
+ return 1;
+}
+
+static int mpc624_detach(comedi_device *dev)
+{
+ rt_printk("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(comedi_device *dev, comedi_subdevice *s, comedi_insn *insn, lsampl_t *data)
+{
+ int n, i;
+ unsigned long int data_in, data_out, j;
+ 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);
+// rt_printk("Channel %d: \n", insn->chanspec);
+ if(!insn->n)
+ {
+ rt_printk("MPC624: Warning, no data to aquire\n");
+ return 0;
+ }
+
+ for(n=0; n < insn->n; n++)
+ {
+ // Trigger the convertion
+ outb(MPC624_ADSCK, dev->iobase + MPC624_ADC);
+ comedi_udelay(1);
+ outb(MPC624_ADCS | MPC624_ADSCK, dev->iobase + MPC624_ADC);
+ comedi_udelay(1);
+ outb(0, dev->iobase + MPC624_ADC);
+ comedi_udelay(1);
+
+ // Wait for the convertion to end
+ for(i=0; i<TIMEOUT; i++)
+ {
+ ucPort = inb(dev->iobase + MPC624_ADC);
+ if(ucPort & MPC624_ADBUSY)
+ comedi_udelay(1000);
+ else
+ break;
+ }
+ if(i == TIMEOUT)
+ {
+ rt_printk("MPC624: timeout (%dms)\n", TIMEOUT);
+ data[n] = 0;
+ return -ETIMEDOUT;
+ }
+
+ // Start reading data
+ data_in = 0;
+ data_out = devpriv->ulConvertionRate;
+ comedi_udelay(1);
+ for(i = 0; i < 32; i++)
+ {
+ // Set the clock low
+ outb(0, dev->iobase + MPC624_ADC);
+ comedi_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);
+ comedi_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);
+ comedi_udelay(1);
+ // Set the clock high
+ outb(MPC624_ADSCK, dev->iobase + MPC624_ADC);
+ }
+ // Read ADSDO on high clock (receive from MPC624)
+ comedi_udelay(1);
+ data_in <<= 1;
+ data_in |= (inb(dev->iobase + MPC624_ADC) & MPC624_ADSDO) >> 4;
+ comedi_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 convertion result
+ // ....
+ // 05: LSB (Least Significant Bit) - the last bit of convertion result
+ // 04: sub-LSB - sub-LSBs are basically noise, but when
+ // 03: sub-LSB averaged properly, they can increase convertion
+ // 02: sub-LSB precision up to 29 bits; they can be discarded
+ // 01: sub-LSB without loss of resolution.
+ // 00: sub-LSB
+
+ if(data_in & MPC624_EOC_BIT)
+ rt_printk("MPC624: EOC bit is set (data_in=%d)!", data_in);
+ if(data_in & MPC624_DMY_BIT)
+ rt_printk("MPC624: DMY bit is set (data_in=%d)!", data_in);
+ if(data_in & MPC624_SGN_BIT) // check the sign bit
+ { // The voltage is positive
+ data_in &= 0x3FFFFFFF; // EOC and DMY should be 0, but we will mask them out just to be sure
+ data[n] = data_in; // comedi operates on unsigned numbers, so we don't clear the SGN bit
+ // SGN bit is still set! It's correct, since we're converting to unsigned.
+ }
+ 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);
projects / comedi.git / commitdiff