Initial commit

external/CMSIS_5/CMSIS/RTOS/RTX/SRC/rt_Timer.c

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+/*----------------------------------------------------------------------------
+ *      CMSIS-RTOS  -  RTX
+ *----------------------------------------------------------------------------
+ *      Name:    RT_TIMER.C
+ *      Purpose: User timer functions
+ *      Rev.:    V4.70
+ *----------------------------------------------------------------------------
+ *
+ * Copyright (c) 1999-2009 KEIL, 2009-2017 ARM Germany GmbH. All rights reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the License); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an AS IS BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *---------------------------------------------------------------------------*/
+
+#include "rt_TypeDef.h"
+#include "RTX_Config.h"
+#include "rt_Timer.h"
+#include "rt_MemBox.h"
+
+#ifndef __CMSIS_RTOS
+
+
+/*----------------------------------------------------------------------------
+ *      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 == 0U) && ((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 == 0U) || (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);
+}
+
+
+#endif
+
+/*----------------------------------------------------------------------------
+ * end of file
+ *---------------------------------------------------------------------------*/