From 18aa77c7064c27c6247407d17ccd38d525272ed2 Mon Sep 17 00:00:00 2001
From: Rostislav Lisovy <lisovy@gmail.com>
Date: Fri, 8 Apr 2011 00:58:48 +0200
Subject: [PATCH 1/1] Added Comedi userspace program for setting DACs. Tested.
 Working

---
 .../userspace/dac_example/Makefile            |  2 +
 .../userspace/dac_example/main.c              | 40 +++++++++++++++++++
 .../userspace/dout_example/main.c             |  2 +-
 .../userspace/{dout_example => }/mf624.h      |  0
 4 files changed, 43 insertions(+), 1 deletion(-)
 create mode 100644 src/comedi/simple_driver/userspace/dac_example/Makefile
 create mode 100644 src/comedi/simple_driver/userspace/dac_example/main.c
 rename src/comedi/simple_driver/userspace/{dout_example => }/mf624.h (100%)

diff --git a/src/comedi/simple_driver/userspace/dac_example/Makefile b/src/comedi/simple_driver/userspace/dac_example/Makefile
new file mode 100644
index 0000000..8e4f4ee
--- /dev/null
+++ b/src/comedi/simple_driver/userspace/dac_example/Makefile
@@ -0,0 +1,2 @@
+all:
+	gcc main.c -o main -lcomedi -lm
diff --git a/src/comedi/simple_driver/userspace/dac_example/main.c b/src/comedi/simple_driver/userspace/dac_example/main.c
new file mode 100644
index 0000000..7e70a41
--- /dev/null
+++ b/src/comedi/simple_driver/userspace/dac_example/main.c
@@ -0,0 +1,40 @@
+#include <stdio.h>
+#include <comedilib.h>
+#include "../mf624.h"
+
+/* Converts Volts into format needed by card.
+Input should be integer (no float) */
+int phys_to_comedi(int val)
+{
+	if (val >= -10 && val <= 10) {
+		return 0x2000 + (val * (0x2000/10));
+	}
+	else {
+		return 0x2000; // 0V
+	}
+}
+
+int main(int argc, char* argv[])
+{
+	comedi_t* comedi_dev;
+	int status;
+	int channel = 0;
+	int range = 0;
+	int aref = 0;
+
+	comedi_dev = comedi_open("/dev/comedi0");
+	if (comedi_dev == NULL) {
+		comedi_perror("comedi_open");
+		return 1;
+	}
+
+	while(1) {
+		status = comedi_data_write(comedi_dev, MF624_AO_SUBDEV, channel, range, aref, phys_to_comedi(5));
+		if (status == -1) {
+			comedi_perror("comedi_data_write");
+		}
+		sleep(1);
+	}
+
+	return 0;
+}
diff --git a/src/comedi/simple_driver/userspace/dout_example/main.c b/src/comedi/simple_driver/userspace/dout_example/main.c
index 22b4f4e..58f61ec 100644
--- a/src/comedi/simple_driver/userspace/dout_example/main.c
+++ b/src/comedi/simple_driver/userspace/dout_example/main.c
@@ -1,6 +1,6 @@
 #include <stdio.h>
 #include <comedilib.h>
-#include "mf624.h"
+#include "../mf624.h"
 
 int main(int argc, char* argv[])
 {
diff --git a/src/comedi/simple_driver/userspace/dout_example/mf624.h b/src/comedi/simple_driver/userspace/mf624.h
similarity index 100%
rename from src/comedi/simple_driver/userspace/dout_example/mf624.h
rename to src/comedi/simple_driver/userspace/mf624.h
-- 
2.39.2