From: David Schleef <ds@schleef.org>
Date: Fri, 2 Jun 2000 21:37:40 +0000 (+0000)
Subject: added antialias.c
X-Git-Tag: r0_7_10~14
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=644fca15d20c3e5bf14c208419104f9f3767c2c4;p=comedilib.git

added antialias.c
---

diff --git a/demo/antialias.c b/demo/antialias.c
new file mode 100644
index 0000000..01583cf
--- /dev/null
+++ b/demo/antialias.c
@@ -0,0 +1,75 @@
+/*
+   A little output demo
+ */
+
+#include <stdio.h>
+#include <comedilib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <errno.h>
+#include <getopt.h>
+#include <ctype.h>
+
+extern int verbose_flag;
+extern int subdevice;
+extern int range;
+extern int channel;
+extern int aref;
+extern int value;
+extern char *filename;
+
+comedi_t *device;
+
+void ao_antialias(unsigned int data);
+
+int main(int argc, char *argv[])
+{
+	lsampl_t data;
+	int ret;
+
+#if 0
+	parse_options(argc,argv);
+
+	device=comedi_open(filename);
+	if(!device){
+		comedi_perror(filename);
+		exit(0);
+	}
+
+	data = value; 
+	if(verbose_flag){
+		printf("writing %d to device=%s subdevice=%d channel=%d range=%d analog reference=%d\n",
+			data,filename,subdevice,channel,range,aref);
+	}
+
+	ret=comedi_data_write(device,subdevice,channel,range,aref,data);
+	if(ret<0){
+		comedi_perror(filename);
+		exit(0);
+	}
+
+	printf("%d\n",data);
+#endif
+
+	ao_antialias((1000<<16)+1000);
+
+	return 0;
+}
+
+
+void ao_antialias(unsigned int data)
+{
+	unsigned int hibits=data>>16;
+	unsigned int lobits=data&0xffff;
+	int i;
+	unsigned int acc;
+
+	acc=0;
+	for(i=0;i<100;i++){
+		acc+=lobits;
+		printf("%d\n",hibits+(acc>>16));
+		acc&=0xffff;
+	}
+}
+