From 05dd8c79b40af0221973ba0ee19ee0066c3a8dde Mon Sep 17 00:00:00 2001
From: patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3>
Date: Sat, 9 Jun 2007 15:49:44 +0000
Subject: Add support for custom system timer frequency

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@274 42af7a65-404d-4744-a932-0658087f49c3
---
 nuttx/include/time.h | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

(limited to 'nuttx/include/time.h')

diff --git a/nuttx/include/time.h b/nuttx/include/time.h
index 7a9731423..92b849fbe 100644
--- a/nuttx/include/time.h
+++ b/nuttx/include/time.h
@@ -51,9 +51,16 @@
  * Definitions
  ********************************************************************************/
 
-/* Clock tick of the system */
+/* Clock tick of the system (frequency Hz).  The default value is 100Hz, but this
+ * default setting can be overridden by defining the clock interval in
+ * milliseconds as CONFIG_MSEC_PER_TICK in the board configuration file.
+ */
 
-#define CLK_TCK 100
+#ifdef CONFIG_MSEC_PER_TICK
+# define CLK_TCK (1000/CONFIG_MSEC_PER_TICK)
+#else
+# define CLK_TCK (100)
+#endif
 
 /* This is the only clock_id supported by the "Clock and Timer
  * Functions."
-- 
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