90 lines
2.4 KiB
C
90 lines
2.4 KiB
C
/*
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kcomedilib/data.c
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implements comedi_data_*() functions
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COMEDI - Linux Control and Measurement Device Interface
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Copyright (C) 2000 David A. Schleef <ds@schleef.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "../comedi.h"
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#include "../comedilib.h"
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#include "../comedidev.h" /* for comedi_udelay() */
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#include <linux/string.h>
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int comedi_data_write(comedi_t * dev, unsigned int subdev, unsigned int chan,
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unsigned int range, unsigned int aref, lsampl_t data)
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{
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comedi_insn insn;
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memset(&insn, 0, sizeof(insn));
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insn.insn = INSN_WRITE;
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insn.n = 1;
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insn.data = &data;
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insn.subdev = subdev;
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insn.chanspec = CR_PACK(chan, range, aref);
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return comedi_do_insn(dev, &insn);
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}
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int comedi_data_read(comedi_t * dev, unsigned int subdev, unsigned int chan,
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unsigned int range, unsigned int aref, lsampl_t * data)
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{
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comedi_insn insn;
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memset(&insn, 0, sizeof(insn));
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insn.insn = INSN_READ;
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insn.n = 1;
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insn.data = data;
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insn.subdev = subdev;
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insn.chanspec = CR_PACK(chan, range, aref);
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return comedi_do_insn(dev, &insn);
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}
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int comedi_data_read_hint(comedi_t * dev, unsigned int subdev,
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unsigned int chan, unsigned int range, unsigned int aref)
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{
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comedi_insn insn;
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lsampl_t dummy_data;
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memset(&insn, 0, sizeof(insn));
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insn.insn = INSN_READ;
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insn.n = 0;
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insn.data = &dummy_data;
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insn.subdev = subdev;
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insn.chanspec = CR_PACK(chan, range, aref);
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return comedi_do_insn(dev, &insn);
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}
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int comedi_data_read_delayed(comedi_t * dev, unsigned int subdev,
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unsigned int chan, unsigned int range, unsigned int aref,
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lsampl_t * data, unsigned int nano_sec)
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{
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int retval;
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retval = comedi_data_read_hint(dev, subdev, chan, range, aref);
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if (retval < 0)
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return retval;
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comedi_udelay((nano_sec + 999) / 1000);
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return comedi_data_read(dev, subdev, chan, range, aref, data);
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}
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