tool/mbed/mbed-sdk/libraries/rtos/rtx/TARGET_CORTEX_A/rt_Event.c

   1 /*----------------------------------------------------------------------------
   2  *      RL-ARM - RTX
   3  *----------------------------------------------------------------------------
   4  *      Name:    RT_EVENT.C
   5  *      Purpose: Implements waits and wake-ups for event flags
   6  *      Rev.:    V4.60
   7  *----------------------------------------------------------------------------
   8  *
   9  * Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
  10  * All rights reserved.
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions are met:
  13  *  - Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *  - Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *  - Neither the name of ARM  nor the names of its contributors may be used
  19  *    to endorse or promote products derived from this software without
  20  *    specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  23  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  32  * POSSIBILITY OF SUCH DAMAGE.
  33  *---------------------------------------------------------------------------*/
  34
  35 #include "rt_TypeDef.h"
  36 #include "RTX_Config.h"
  37 #include "rt_System.h"
  38 #include "rt_Event.h"
  39 #include "rt_List.h"
  40 #include "rt_Task.h"
  41 #ifdef __CORTEX_A9
  42 #include "rt_HAL_CA.h"
  43 #else
  44 #include "rt_HAL_CM.h"
  45 #endif
  46
  47
  48 /*----------------------------------------------------------------------------
  49  *      Functions
  50  *---------------------------------------------------------------------------*/
  51
  52
  53 /*--------------------------- rt_evt_wait -----------------------------------*/
  54
  55 OS_RESULT rt_evt_wait (U16 wait_flags, U16 timeout, BOOL and_wait) {
  56   /* Wait for one or more event flags with optional time-out.                */
  57   /* "wait_flags" identifies the flags to wait for.                          */
  58   /* "timeout" is the time-out limit in system ticks (0xffff if no time-out) */
  59   /* "and_wait" specifies the AND-ing of "wait_flags" as condition to be met */
  60   /* to complete the wait. (OR-ing if set to 0).                             */
  61   U32 block_state;
  62
  63   if (and_wait) {
  64     /* Check for AND-connected events */
  65     if ((os_tsk.run->events & wait_flags) == wait_flags) {
  66       os_tsk.run->events &= ~wait_flags;
  67       return (OS_R_EVT);
  68     }
  69     block_state = WAIT_AND;
  70   }
  71   else {
  72     /* Check for OR-connected events */
  73     if (os_tsk.run->events & wait_flags) {
  74       os_tsk.run->waits = os_tsk.run->events & wait_flags;
  75       os_tsk.run->events &= ~wait_flags;
  76       return (OS_R_EVT);
  77     }
  78     block_state = WAIT_OR;
  79   }
  80   /* Task has to wait */
  81   os_tsk.run->waits = wait_flags;
  82   rt_block (timeout, (U8)block_state);
  83   return (OS_R_TMO);
  84 }
  85
  86
  87 /*--------------------------- rt_evt_set ------------------------------------*/
  88
  89 void rt_evt_set (U16 event_flags, OS_TID task_id) {
  90   /* Set one or more event flags of a selectable task. */
  91   P_TCB p_tcb;
  92
  93   p_tcb = os_active_TCB[task_id-1];
  94   if (p_tcb == NULL) {
  95     return;
  96   }
  97   p_tcb->events |= event_flags;
  98   event_flags    = p_tcb->waits;
  99   /* If the task is not waiting for an event, it should not be put */
 100   /* to ready state. */
 101   if (p_tcb->state == WAIT_AND) {
 102     /* Check for AND-connected events */
 103     if ((p_tcb->events & event_flags) == event_flags) {
 104       goto wkup;
 105     }
 106   }
 107   if (p_tcb->state == WAIT_OR) {
 108     /* Check for OR-connected events */
 109     if (p_tcb->events & event_flags) {
 110       p_tcb->waits  &= p_tcb->events;
 111 wkup: p_tcb->events &= ~event_flags;
 112       rt_rmv_dly (p_tcb);
 113       p_tcb->state   = READY;
 114 #ifdef __CMSIS_RTOS
 115       rt_ret_val2(p_tcb, 0x08/*osEventSignal*/, p_tcb->waits);
 116 #else
 117       rt_ret_val (p_tcb, OS_R_EVT);
 118 #endif
 119       rt_dispatch (p_tcb);
 120     }
 121   }
 122 }
 123
 124
 125 /*--------------------------- rt_evt_clr ------------------------------------*/
 126
 127 void rt_evt_clr (U16 clear_flags, OS_TID task_id) {
 128   /* Clear one or more event flags (identified by "clear_flags") of a */
 129   /* selectable task (identified by "task"). */
 130   P_TCB task = os_active_TCB[task_id-1];
 131
 132   if (task == NULL) {
 133     return;
 134   }
 135   task->events &= ~clear_flags;
 136 }
 137
 138
 139 /*--------------------------- isr_evt_set -----------------------------------*/
 140
 141 void isr_evt_set (U16 event_flags, OS_TID task_id) {
 142   /* Same function as "os_evt_set", but to be called by ISRs. */
 143   P_TCB p_tcb = os_active_TCB[task_id-1];
 144
 145   if (p_tcb == NULL) {
 146     return;
 147   }
 148   rt_psq_enq (p_tcb, event_flags);
 149   rt_psh_req ();
 150 }
 151
 152
 153 /*--------------------------- rt_evt_get ------------------------------------*/
 154
 155 U16 rt_evt_get (void) {
 156   /* Get events of a running task after waiting for OR connected events. */
 157   return (os_tsk.run->waits);
 158 }
 159
 160
 161 /*--------------------------- rt_evt_psh ------------------------------------*/
 162
 163 void rt_evt_psh (P_TCB p_CB, U16 set_flags) {
 164   /* Check if task has to be waken up */
 165   U16 event_flags;
 166
 167   p_CB->events |= set_flags;
 168   event_flags = p_CB->waits;
 169   if (p_CB->state == WAIT_AND) {
 170     /* Check for AND-connected events */
 171     if ((p_CB->events & event_flags) == event_flags) {
 172       goto rdy;
 173     }
 174   }
 175   if (p_CB->state == WAIT_OR) {
 176     /* Check for OR-connected events */
 177     if (p_CB->events & event_flags) {
 178       p_CB->waits  &= p_CB->events;
 179 rdy:  p_CB->events &= ~event_flags;
 180       rt_rmv_dly (p_CB);
 181       p_CB->state   = READY;
 182 #ifdef __CMSIS_RTOS
 183       rt_ret_val2(p_CB, 0x08/*osEventSignal*/, p_CB->waits);
 184 #else
 185       rt_ret_val (p_CB, OS_R_EVT);
 186 #endif
 187       rt_put_prio (&os_rdy, p_CB);
 188     }
 189   }
 190 }
 191
 192 /*----------------------------------------------------------------------------
 193  * end of file
 194  *---------------------------------------------------------------------------*/