1 /*----------------------------------------------------------------------------
3 *----------------------------------------------------------------------------
5 * Purpose: Implements waits and wake-ups for event flags
7 *----------------------------------------------------------------------------
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.
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 *---------------------------------------------------------------------------*/
35 #include "rt_TypeDef.h"
37 #include "rt_System.h"
41 #include "rt_HAL_CM.h"
44 /*----------------------------------------------------------------------------
46 *---------------------------------------------------------------------------*/
49 /*--------------------------- rt_evt_wait -----------------------------------*/
51 OS_RESULT rt_evt_wait (U16 wait_flags, U16 timeout, BOOL and_wait) {
52 /* Wait for one or more event flags with optional time-out. */
53 /* "wait_flags" identifies the flags to wait for. */
54 /* "timeout" is the time-out limit in system ticks (0xffff if no time-out) */
55 /* "and_wait" specifies the AND-ing of "wait_flags" as condition to be met */
56 /* to complete the wait. (OR-ing if set to 0). */
60 /* Check for AND-connected events */
61 if ((os_tsk.run->events & wait_flags) == wait_flags) {
62 os_tsk.run->events &= ~wait_flags;
65 block_state = WAIT_AND;
68 /* Check for OR-connected events */
69 if (os_tsk.run->events & wait_flags) {
70 os_tsk.run->waits = os_tsk.run->events & wait_flags;
71 os_tsk.run->events &= ~wait_flags;
74 block_state = WAIT_OR;
76 /* Task has to wait */
77 os_tsk.run->waits = wait_flags;
78 rt_block (timeout, (U8)block_state);
83 /*--------------------------- rt_evt_set ------------------------------------*/
85 void rt_evt_set (U16 event_flags, OS_TID task_id) {
86 /* Set one or more event flags of a selectable task. */
89 p_tcb = os_active_TCB[task_id-1];
93 p_tcb->events |= event_flags;
94 event_flags = p_tcb->waits;
95 /* If the task is not waiting for an event, it should not be put */
97 if (p_tcb->state == WAIT_AND) {
98 /* Check for AND-connected events */
99 if ((p_tcb->events & event_flags) == event_flags) {
103 if (p_tcb->state == WAIT_OR) {
104 /* Check for OR-connected events */
105 if (p_tcb->events & event_flags) {
106 p_tcb->waits &= p_tcb->events;
107 wkup: p_tcb->events &= ~event_flags;
109 p_tcb->state = READY;
111 rt_ret_val2(p_tcb, 0x08/*osEventSignal*/, p_tcb->waits);
113 rt_ret_val (p_tcb, OS_R_EVT);
121 /*--------------------------- rt_evt_clr ------------------------------------*/
123 void rt_evt_clr (U16 clear_flags, OS_TID task_id) {
124 /* Clear one or more event flags (identified by "clear_flags") of a */
125 /* selectable task (identified by "task"). */
126 P_TCB task = os_active_TCB[task_id-1];
131 task->events &= ~clear_flags;
135 /*--------------------------- isr_evt_set -----------------------------------*/
137 void isr_evt_set (U16 event_flags, OS_TID task_id) {
138 /* Same function as "os_evt_set", but to be called by ISRs. */
139 P_TCB p_tcb = os_active_TCB[task_id-1];
144 rt_psq_enq (p_tcb, event_flags);
149 /*--------------------------- rt_evt_get ------------------------------------*/
151 U16 rt_evt_get (void) {
152 /* Get events of a running task after waiting for OR connected events. */
153 return (os_tsk.run->waits);
157 /*--------------------------- rt_evt_psh ------------------------------------*/
159 void rt_evt_psh (P_TCB p_CB, U16 set_flags) {
160 /* Check if task has to be waken up */
163 p_CB->events |= set_flags;
164 event_flags = p_CB->waits;
165 if (p_CB->state == WAIT_AND) {
166 /* Check for AND-connected events */
167 if ((p_CB->events & event_flags) == event_flags) {
171 if (p_CB->state == WAIT_OR) {
172 /* Check for OR-connected events */
173 if (p_CB->events & event_flags) {
174 p_CB->waits &= p_CB->events;
175 rdy: p_CB->events &= ~event_flags;
179 rt_ret_val2(p_CB, 0x08/*osEventSignal*/, p_CB->waits);
181 rt_ret_val (p_CB, OS_R_EVT);
183 rt_put_prio (&os_rdy, p_CB);
188 /*----------------------------------------------------------------------------
190 *---------------------------------------------------------------------------*/