From 4a9dd8e9d33620b986ad484d6a9c508eabb6a2af Mon Sep 17 00:00:00 2001
From: Frank Mori Hess <fmhess@speakeasy.net>
Date: Mon, 29 Apr 2002 18:22:41 +0000
Subject: [PATCH] added comedi_data_read_delayed()

---
 include/comedilib.h |  2 ++
 lib/data.c          | 38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/include/comedilib.h b/include/comedilib.h
index ed31b79..c76a87b 100644
--- 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 f80a473..f67914d 100644
--- 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);
+}
+
-- 
2.26.2