From: Frank Mori Hess <fmhess@speakeasy.net>
Date: Fri, 11 May 2001 04:29:11 +0000 (+0000)
Subject: added hack to fix broken rtlinux compatibility headers and let driver work for more... 
X-Git-Tag: r0_7_59~50
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=78028e71a329a5dd1bc991ffcd7f378ca07be480;p=comedi.git

added hack to fix broken rtlinux compatibility headers and let driver work for more than a half hour
---

diff --git a/comedi/drivers/comedi_rt_timer.c b/comedi/drivers/comedi_rt_timer.c
index 55872d06..0574f846 100644
--- a/comedi/drivers/comedi_rt_timer.c
+++ b/comedi/drivers/comedi_rt_timer.c
@@ -35,6 +35,26 @@
 #include <rtl.h>
 #include <rtl_sched.h>
 #include <rtl_compat.h>
+
+// begin hack to fix HRT_TO_8254() function on rtlinux
+#undef HRT_TO_8254(x)
+#define HRT_TO_8254(x) nano2tick_hack(x)
+long long nano2tick_hack(long long ns)
+{
+	unsigned long most = ns >> 32;
+	unsigned long least = ns;
+	unsigned long denom = 838;
+	unsigned long remainder = (most % denom);
+
+	most /= denom;
+	least = remainder * (0xffffffff / denom) + (remainder + least) / denom;
+
+	ns = (long long) most * (long long) 0x100000000 + (long long) least;
+
+	return ns;
+}
+// end hack
+
 #endif
 #ifdef CONFIG_COMEDI_RTAI
 #include <rtai.h>
@@ -44,7 +64,6 @@
 /* Change this if you need more channels */
 #define N_CHANLIST 16
 
-
 static int timer_attach(comedi_device *dev,comedi_devconfig *it);
 static int timer_detach(comedi_device *dev);
 static comedi_driver driver_timer={
@@ -335,7 +354,6 @@ static int timer_cmd(comedi_device *dev,comedi_subdevice *s)
 		comedi_error(dev, "error initalizing task");
 		return ret;
 	}
-
 	now=rt_get_time();
 	ret = rt_task_make_periodic(&devpriv->rt_task,now+delay,period);
 	if(ret < 0)