Diff: rtx_ca/rt_Timer.c

Revision:

48:e9a2c7cb57a4

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rtx_ca/rt_Timer.c	Thu Nov 06 11:00:33 2014 +0000
@@ -0,0 +1,129 @@
+/*----------------------------------------------------------------------------
+ *      RL-ARM - RTX
+ *----------------------------------------------------------------------------
+ *      Name:    RT_TIMER.C
+ *      Purpose: User timer functions
+ *      Rev.:    V4.60
+ *----------------------------------------------------------------------------
+ *
+ * Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
+ * All rights reserved.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *  - Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  - Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *  - Neither the name of ARM  nor the names of its contributors may be used 
+ *    to endorse or promote products derived from this software without 
+ *    specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *---------------------------------------------------------------------------*/
+
+#include "rt_TypeDef.h"
+#include "RTX_Config.h"
+#include "rt_Timer.h"
+#include "rt_MemBox.h"
+
+
+/*----------------------------------------------------------------------------
+ *      Global Variables
+ *---------------------------------------------------------------------------*/
+
+/* User Timer list pointer */
+struct OS_XTMR os_tmr;
+
+/*----------------------------------------------------------------------------
+ *      Functions
+ *---------------------------------------------------------------------------*/
+
+/*--------------------------- rt_tmr_tick -----------------------------------*/
+
+void rt_tmr_tick (void) {
+  /* Decrement delta count of timer list head. Timers having the value of   */
+  /* zero are removed from the list and the callback function is called.    */
+  P_TMR p;
+
+  if (os_tmr.next == NULL) {
+    return;
+  }
+  os_tmr.tcnt--;
+  while (os_tmr.tcnt == 0 && (p = os_tmr.next) != NULL) {
+    /* Call a user provided function to handle an elapsed timer */
+    os_tmr_call (p->info);
+    os_tmr.tcnt = p->tcnt;
+    os_tmr.next = p->next;
+    rt_free_box ((U32 *)m_tmr, p);
+  }
+}
+
+/*--------------------------- rt_tmr_create ---------------------------------*/
+
+OS_ID rt_tmr_create (U16 tcnt, U16 info)  {
+  /* Create an user timer and put it into the chained timer list using      */
+  /* a timeout count value of "tcnt". User parameter "info" is used as a    */
+  /* parameter for the user provided callback function "os_tmr_call ()".    */
+  P_TMR p_tmr, p;
+  U32 delta,itcnt = tcnt;
+
+  if (tcnt == 0 || m_tmr == NULL)  {
+    return (NULL);
+  }
+  p_tmr = rt_alloc_box ((U32 *)m_tmr);
+  if (!p_tmr)  {
+    return (NULL);
+  }
+  p_tmr->info = info;
+  p = (P_TMR)&os_tmr;
+  delta = p->tcnt;
+  while (delta < itcnt && p->next != NULL) {
+    p = p->next;
+    delta += p->tcnt;
+  }
+  /* Right place found, insert timer into the list */
+  p_tmr->next = p->next;
+  p_tmr->tcnt = (U16)(delta - itcnt);
+  p->next = p_tmr;
+  p->tcnt -= p_tmr->tcnt;
+  return (p_tmr);
+}
+
+/*--------------------------- rt_tmr_kill -----------------------------------*/
+
+OS_ID rt_tmr_kill (OS_ID timer)  {
+  /* Remove user timer from the chained timer list. */
+  P_TMR p, p_tmr;
+
+  p_tmr = (P_TMR)timer;
+  p = (P_TMR)&os_tmr;
+  /* Search timer list for requested timer */
+  while (p->next != p_tmr)  {
+    if (p->next == NULL) {
+      /* Failed, "timer" is not in the timer list */
+      return (p_tmr);
+    }
+    p = p->next;
+  }
+  /* Timer was found, remove it from the list */
+  p->next = p_tmr->next;
+  p->tcnt += p_tmr->tcnt;
+  rt_free_box ((U32 *)m_tmr, p_tmr);
+  /* Timer killed */
+  return (NULL);
+}
+
+/*----------------------------------------------------------------------------
+ * end of file
+ *---------------------------------------------------------------------------*/