From cf695df834efc718b2ed17e9c83e127fd63c9033 Mon Sep 17 00:00:00 2001 From: Fred Brooks Date: Fri, 20 Jun 2014 12:53:15 +0100 Subject: [PATCH] staging: comedi: ni_daq_700: add AI range and input mode switching Add support for switching the input range and the single-ended/ differential input mode for the AI subdevice. We needed to clear the FIFO of data before the conversion to handle card mode switching glitches. [ Minor whitespace fixes and driver comment reformatting. - Ian ] Signed-off-by: Fred Brooks Signed-off-by: Ian Abbott Reviewed-by: H Hartley Sweeten Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/ni_daq_700.c | 51 ++++++++++++++++++++++++----- 1 file changed, 42 insertions(+), 9 deletions(-) diff --git a/drivers/staging/comedi/drivers/ni_daq_700.c b/drivers/staging/comedi/drivers/ni_daq_700.c index 4eedefd..3d841d4 100644 --- a/drivers/staging/comedi/drivers/ni_daq_700.c +++ b/drivers/staging/comedi/drivers/ni_daq_700.c @@ -24,21 +24,30 @@ * based on ni_daq_dio24 by Daniel Vecino Castel * Devices: [National Instruments] PCMCIA DAQ-Card-700 (ni_daq_700) * Status: works - * Updated: Wed, 19 Sep 2012 12:07:20 +0000 + * Updated: Wed, 21 May 2014 12:07:20 +0000 * * The daqcard-700 appears in Comedi as a digital I/O subdevice (0) with - * 16 channels and a analog input subdevice (1) with 16 single-ended channels. + * 16 channels and a analog input subdevice (1) with 16 single-ended channels + * or 8 differential channels, and three input ranges. * * Digital: The channel 0 corresponds to the daqcard-700's output * port, bit 0; channel 8 corresponds to the input port, bit 0. * * Digital direction configuration: channels 0-7 output, 8-15 input. * - * Analog: The input range is 0 to 4095 for -10 to +10 volts + * Analog: The input range is 0 to 4095 with a default of -10 to +10 volts. + * Valid ranges: + * 0 for -10 to 10V bipolar + * 1 for -5 to 5V bipolar + * 2 for -2.5 to 2.5V bipolar + * * IRQ is assigned but not used. * * Version 0.1 Original DIO only driver * Version 0.2 DIO and basic AI analog input support on 16 se channels + * Version 0.3 Add SE or DIFF mode and range switching +-10,+-5,+-2.5 + * Clear the FIFO of data before the conversion to handle card + * mode switching glitches. * * Manuals: Register level: http://www.ni.com/pdf/manuals/340698.pdf * User Manual: http://www.ni.com/pdf/manuals/320676d.pdf @@ -68,6 +77,17 @@ #define CDA_R2 0x0A /* RW 8bit */ #define CMO_R 0x0B /* RO 8bit */ #define TIC_R 0x06 /* WO 8bit */ +/* daqcard700 modes */ +#define CMD_R3_DIFF 0x04 /* diff mode */ + +static const struct comedi_lrange range_daq700_ai = { + 3, + { + BIP_RANGE(10), + BIP_RANGE(5), + BIP_RANGE(2.5) + } +}; static int daq700_dio_insn_bits(struct comedi_device *dev, struct comedi_subdevice *s, @@ -130,11 +150,22 @@ static int daq700_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_insn *insn, unsigned int *data) { - int n, chan; + int n; int d; int ret; + unsigned int chan = CR_CHAN(insn->chanspec); + unsigned int aref = CR_AREF(insn->chanspec); + unsigned int range = CR_RANGE(insn->chanspec); + unsigned int r3_bits = 0; + + /* set channel input modes */ + if (aref == AREF_DIFF) + r3_bits |= CMD_R3_DIFF; + /* write channel mode/range */ + if (range >= 1) + range++; /* convert range to hardware value */ + outb(r3_bits | (range & 0x03), dev->iobase + CMD_R3); - chan = CR_CHAN(insn->chanspec); /* write channel to multiplexer */ /* set mask scan bit high to disable scanning */ outb(chan | 0x80, dev->iobase + CMD_R1); @@ -146,6 +177,9 @@ static int daq700_ai_rinsn(struct comedi_device *dev, /* trigger conversion with out0 L to H */ outb(0x00, dev->iobase + CMD_R2); /* enable ADC conversions */ outb(0x30, dev->iobase + CMO_R); /* mode 0 out0 L, from H */ + outb(0x00, dev->iobase + ADCLEAR_R); /* clear the ADC FIFO */ + /* read 16bit junk from FIFO to clear */ + inw(dev->iobase + ADFIFO_R); /* mode 1 out0 H, L to H, start conversion */ outb(0x32, dev->iobase + CMO_R); @@ -221,11 +255,10 @@ static int daq700_auto_attach(struct comedi_device *dev, /* DAQCard-700 ai */ s = &dev->subdevices[1]; s->type = COMEDI_SUBD_AI; - /* we support single-ended (ground) */ - s->subdev_flags = SDF_READABLE | SDF_GROUND; + s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF; s->n_chan = 16; s->maxdata = (1 << 12) - 1; - s->range_table = &range_bipolar10; + s->range_table = &range_daq700_ai; s->insn_read = daq700_ai_rinsn; daq700_ai_config(dev, s); @@ -262,5 +295,5 @@ module_comedi_pcmcia_driver(daq700_driver, daq700_cs_driver); MODULE_AUTHOR("Fred Brooks "); MODULE_DESCRIPTION( "Comedi driver for National Instruments PCMCIA DAQCard-700 DIO/AI"); -MODULE_VERSION("0.2.00"); +MODULE_VERSION("0.3.00"); MODULE_LICENSE("GPL"); -- 2.7.4