From 5047ce62e8c7c4b702d68f29dff42e65200924b1 Mon Sep 17 00:00:00 2001
From: Giovanni Di Sirio <gdisirio@gmail.com>
Date: Sat, 4 Apr 2015 08:19:04 +0000
Subject: Time conversion macros fixes.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@7851 35acf78f-673a-0410-8e92-d51de3d6d3f4
---
 os/rt/include/chvt.h | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

(limited to 'os/rt')

diff --git a/os/rt/include/chvt.h b/os/rt/include/chvt.h
index 01dc38ac6..ae26beacf 100644
--- a/os/rt/include/chvt.h
+++ b/os/rt/include/chvt.h
@@ -118,8 +118,8 @@
  * @api
  */
 #define MS2ST(msec)                                                         \
-  ((systime_t)((((((uint32_t)(msec)) *                                      \
-                  ((uint32_t)CH_CFG_ST_FREQUENCY)) - 1UL) / 1000UL) + 1UL))
+  ((systime_t)((((uint32_t)(msec)) *                                        \
+                ((uint32_t)CH_CFG_ST_FREQUENCY) + 999UL) / 1000UL))
 
 /**
  * @brief   Microseconds to system ticks.
@@ -132,8 +132,8 @@
  * @api
  */
 #define US2ST(usec)                                                         \
-  ((systime_t)((((((uint32_t)(usec)) *                                      \
-                  ((uint32_t)CH_CFG_ST_FREQUENCY)) - 1UL) / 1000000UL) + 1UL))
+  ((systime_t)((((uint32_t)(usec)) *                                        \
+                ((uint32_t)CH_CFG_ST_FREQUENCY) + 999999UL) / 1000000UL))
 
 /**
  * @brief   System ticks to seconds.
@@ -145,7 +145,7 @@
  *
  * @api
  */
-#define ST2S(n) (((((n) - 1UL) * 1UL) / CH_CFG_ST_FREQUENCY) + 1UL)
+#define ST2S(n) (((n) + CH_CFG_ST_FREQUENCY - 1UL) / CH_CFG_ST_FREQUENCY)
 
 /**
  * @brief   System ticks to milliseconds.
@@ -157,7 +157,8 @@
  *
  * @api
  */
-#define ST2MS(n) (((((n) - 1UL) * 1000UL) / CH_CFG_ST_FREQUENCY) + 1UL)
+#define ST2MS(n) (((n) * 1000UL + CH_CFG_ST_FREQUENCY - 1UL) /              \
+                  CH_CFG_ST_FREQUENCY)
 
 /**
  * @brief   System ticks to microseconds.
@@ -169,7 +170,8 @@
  *
  * @api
  */
-#define ST2US(n) (((((n) - 1UL) * 1000000UL) / CH_CFG_ST_FREQUENCY) + 1UL)
+#define ST2US(n) (((n) * 1000000UL + CH_CFG_ST_FREQUENCY - 1UL) /           \
+                  CH_CFG_ST_FREQUENCY)
 /** @} */
 
 /*===========================================================================*/
-- 
cgit v1.2.3