added comedi_data_read_delayed()

diff --git a/include/comedilib.h b/include/comedilib.h
index ed31b792ff9609f17bc7da9e5aad35d6f204df3e..c76a87b9cfd656b1adfe16a965130389f7b9a156 100644 (file)
--- a/include/comedilib.h
+++ b/include/comedilib.h
@@ -118,6 +118,8 @@ lsampl_t comedi_from_phys(double data,comedi_range *rng,lsampl_t maxdata);
 /* syncronous stuff */
 int comedi_data_read(comedi_t *it,unsigned int subd,unsigned int chan,
        unsigned int range,unsigned int aref,lsampl_t *data);
+int comedi_data_read_delayed(comedi_t *it,unsigned int subd,unsigned int chan,
+       unsigned int range,unsigned int aref,lsampl_t *data, unsigned int micro_sec);
 int comedi_data_write(comedi_t *it,unsigned int subd,unsigned int chan,
        unsigned int range,unsigned int aref,lsampl_t data);
 int comedi_dio_config(comedi_t *it,unsigned int subd,unsigned int chan,

diff --git a/lib/data.c b/lib/data.c
index f80a473117f245deb39bd5f0cd657edf3c1fa8b5..f67914d8bd134e077b7315d3615ed43c3ed3bb22 100644 (file)
--- a/lib/data.c
+++ b/lib/data.c
@@ -173,3 +173,41 @@ int comedi_data_read(comedi_t *it,unsigned int subdev,unsigned int chan,unsigned
        }
 }
 
+int comedi_data_read_delayed( comedi_t *it, unsigned int subdev, unsigned int chan, unsigned int range,
+       unsigned int aref, lsampl_t *data, unsigned int nano_sec)
+{
+       subdevice *s;
+       comedi_insnlist ilist;
+       comedi_insn insn[3];
+       lsampl_t delay = nano_sec;
+
+       if( !valid_chan( it, subdev, chan ) )
+               return -1;
+
+       s = it->subdevices + subdev;
+
+       memset(&insn,0,sizeof(insn));
+
+       // setup, no conversions
+       insn[0].insn = INSN_READ;
+       insn[0].n = 0;
+       insn[0].data = data;
+       insn[0].subdev = subdev;
+       insn[0].chanspec = CR_PACK( chan, range, aref );
+       // delay
+       insn[1].insn = INSN_WAIT;
+       insn[1].n = 1;
+       insn[1].data = &delay;
+       // take conversion
+       insn[2].insn = INSN_READ;
+       insn[2].n = 1;
+       insn[2].data = data;
+       insn[2].subdev = subdev;
+       insn[2].chanspec = CR_PACK( chan, range, aref );
+
+       ilist.insns = insn;
+       ilist.n_insns = sizeof(insn) / sizeof(insn[0]);
+
+       return comedi_do_insnlist(it, &ilist);
+}
+