Eric Patterson / mbed-rtos

Fork of official mbed Real Time Operating System based on the RTX implementation of the CMSIS-RTOS API open standard.

Dependents:   Final_Coffee_Roaster

Fork of mbed-rtos by mbed official

rtx/rt_Event.c@11:db1fc233faa9, 2013-04-30 (annotated)

Committer:
emilmont
Date:
Tue Apr 30 10:51:19 2013 +0000
Revision:
11:db1fc233faa9
Parent:
6:350b53afb889
Child:
31:015df9e602b6
In the Keil MDK toolchain "RTX_Config.h" is a special system library header file

Who changed what in which revision?

UserRevisionLine numberNew contents of line
emilmont 6:350b53afb889 1 /*----------------------------------------------------------------------------
emilmont 6:350b53afb889 2 * RL-ARM - RTX
emilmont 6:350b53afb889 3 *----------------------------------------------------------------------------
emilmont 6:350b53afb889 4 * Name: RT_EVENT.C
emilmont 6:350b53afb889 5 * Purpose: Implements waits and wake-ups for event flags
emilmont 6:350b53afb889 6 * Rev.: V4.60
emilmont 6:350b53afb889 7 *----------------------------------------------------------------------------
emilmont 6:350b53afb889 8 *
emilmont 6:350b53afb889 9 * Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
emilmont 6:350b53afb889 10 * All rights reserved.
emilmont 6:350b53afb889 11 * Redistribution and use in source and binary forms, with or without
emilmont 6:350b53afb889 12 * modification, are permitted provided that the following conditions are met:
emilmont 6:350b53afb889 13 * - Redistributions of source code must retain the above copyright
emilmont 6:350b53afb889 14 * notice, this list of conditions and the following disclaimer.
emilmont 6:350b53afb889 15 * - Redistributions in binary form must reproduce the above copyright
emilmont 6:350b53afb889 16 * notice, this list of conditions and the following disclaimer in the
emilmont 6:350b53afb889 17 * documentation and/or other materials provided with the distribution.
emilmont 6:350b53afb889 18 * - Neither the name of ARM nor the names of its contributors may be used
emilmont 6:350b53afb889 19 * to endorse or promote products derived from this software without
emilmont 6:350b53afb889 20 * specific prior written permission.
emilmont 6:350b53afb889 21 *
emilmont 6:350b53afb889 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
emilmont 6:350b53afb889 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
emilmont 6:350b53afb889 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
emilmont 6:350b53afb889 25 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
emilmont 6:350b53afb889 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
emilmont 6:350b53afb889 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
emilmont 6:350b53afb889 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
emilmont 6:350b53afb889 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
emilmont 6:350b53afb889 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
emilmont 6:350b53afb889 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
emilmont 6:350b53afb889 32 * POSSIBILITY OF SUCH DAMAGE.
emilmont 6:350b53afb889 33 *---------------------------------------------------------------------------*/
emilmont 6:350b53afb889 34
emilmont 6:350b53afb889 35 #include "rt_TypeDef.h"
emilmont 11:db1fc233faa9 36 #include "RTX_Conf.h"
emilmont 6:350b53afb889 37 #include "rt_System.h"
emilmont 6:350b53afb889 38 #include "rt_Event.h"
emilmont 6:350b53afb889 39 #include "rt_List.h"
emilmont 6:350b53afb889 40 #include "rt_Task.h"
emilmont 6:350b53afb889 41 #include "rt_HAL_CM.h"
emilmont 6:350b53afb889 42
emilmont 6:350b53afb889 43
emilmont 6:350b53afb889 44 /*----------------------------------------------------------------------------
emilmont 6:350b53afb889 45 * Functions
emilmont 6:350b53afb889 46 *---------------------------------------------------------------------------*/
emilmont 6:350b53afb889 47
emilmont 6:350b53afb889 48
emilmont 6:350b53afb889 49 /*--------------------------- rt_evt_wait -----------------------------------*/
emilmont 6:350b53afb889 50
emilmont 6:350b53afb889 51 OS_RESULT rt_evt_wait (U16 wait_flags, U16 timeout, BOOL and_wait) {
emilmont 6:350b53afb889 52 /* Wait for one or more event flags with optional time-out. */
emilmont 6:350b53afb889 53 /* "wait_flags" identifies the flags to wait for. */
emilmont 6:350b53afb889 54 /* "timeout" is the time-out limit in system ticks (0xffff if no time-out) */
emilmont 6:350b53afb889 55 /* "and_wait" specifies the AND-ing of "wait_flags" as condition to be met */
emilmont 6:350b53afb889 56 /* to complete the wait. (OR-ing if set to 0). */
emilmont 6:350b53afb889 57 U32 block_state;
emilmont 6:350b53afb889 58
emilmont 6:350b53afb889 59 if (and_wait) {
emilmont 6:350b53afb889 60 /* Check for AND-connected events */
emilmont 6:350b53afb889 61 if ((os_tsk.run->events & wait_flags) == wait_flags) {
emilmont 6:350b53afb889 62 os_tsk.run->events &= ~wait_flags;
emilmont 6:350b53afb889 63 return (OS_R_EVT);
emilmont 6:350b53afb889 64 }
emilmont 6:350b53afb889 65 block_state = WAIT_AND;
emilmont 6:350b53afb889 66 }
emilmont 6:350b53afb889 67 else {
emilmont 6:350b53afb889 68 /* Check for OR-connected events */
emilmont 6:350b53afb889 69 if (os_tsk.run->events & wait_flags) {
emilmont 6:350b53afb889 70 os_tsk.run->waits = os_tsk.run->events & wait_flags;
emilmont 6:350b53afb889 71 os_tsk.run->events &= ~wait_flags;
emilmont 6:350b53afb889 72 return (OS_R_EVT);
emilmont 6:350b53afb889 73 }
emilmont 6:350b53afb889 74 block_state = WAIT_OR;
emilmont 6:350b53afb889 75 }
emilmont 6:350b53afb889 76 /* Task has to wait */
emilmont 6:350b53afb889 77 os_tsk.run->waits = wait_flags;
emilmont 6:350b53afb889 78 rt_block (timeout, (U8)block_state);
emilmont 6:350b53afb889 79 return (OS_R_TMO);
emilmont 6:350b53afb889 80 }
emilmont 6:350b53afb889 81
emilmont 6:350b53afb889 82
emilmont 6:350b53afb889 83 /*--------------------------- rt_evt_set ------------------------------------*/
emilmont 6:350b53afb889 84
emilmont 6:350b53afb889 85 void rt_evt_set (U16 event_flags, OS_TID task_id) {
emilmont 6:350b53afb889 86 /* Set one or more event flags of a selectable task. */
emilmont 6:350b53afb889 87 P_TCB p_tcb;
emilmont 6:350b53afb889 88
emilmont 6:350b53afb889 89 p_tcb = os_active_TCB[task_id-1];
emilmont 6:350b53afb889 90 if (p_tcb == NULL) {
emilmont 6:350b53afb889 91 return;
emilmont 6:350b53afb889 92 }
emilmont 6:350b53afb889 93 p_tcb->events |= event_flags;
emilmont 6:350b53afb889 94 event_flags = p_tcb->waits;
emilmont 6:350b53afb889 95 /* If the task is not waiting for an event, it should not be put */
emilmont 6:350b53afb889 96 /* to ready state. */
emilmont 6:350b53afb889 97 if (p_tcb->state == WAIT_AND) {
emilmont 6:350b53afb889 98 /* Check for AND-connected events */
emilmont 6:350b53afb889 99 if ((p_tcb->events & event_flags) == event_flags) {
emilmont 6:350b53afb889 100 goto wkup;
emilmont 6:350b53afb889 101 }
emilmont 6:350b53afb889 102 }
emilmont 6:350b53afb889 103 if (p_tcb->state == WAIT_OR) {
emilmont 6:350b53afb889 104 /* Check for OR-connected events */
emilmont 6:350b53afb889 105 if (p_tcb->events & event_flags) {
emilmont 6:350b53afb889 106 p_tcb->waits &= p_tcb->events;
emilmont 6:350b53afb889 107 wkup: p_tcb->events &= ~event_flags;
emilmont 6:350b53afb889 108 rt_rmv_dly (p_tcb);
emilmont 6:350b53afb889 109 p_tcb->state = READY;
emilmont 6:350b53afb889 110 #ifdef __CMSIS_RTOS
emilmont 6:350b53afb889 111 rt_ret_val2(p_tcb, 0x08/*osEventSignal*/, p_tcb->waits);
emilmont 6:350b53afb889 112 #else
emilmont 6:350b53afb889 113 rt_ret_val (p_tcb, OS_R_EVT);
emilmont 6:350b53afb889 114 #endif
emilmont 6:350b53afb889 115 rt_dispatch (p_tcb);
emilmont 6:350b53afb889 116 }
emilmont 6:350b53afb889 117 }
emilmont 6:350b53afb889 118 }
emilmont 6:350b53afb889 119
emilmont 6:350b53afb889 120
emilmont 6:350b53afb889 121 /*--------------------------- rt_evt_clr ------------------------------------*/
emilmont 6:350b53afb889 122
emilmont 6:350b53afb889 123 void rt_evt_clr (U16 clear_flags, OS_TID task_id) {
emilmont 6:350b53afb889 124 /* Clear one or more event flags (identified by "clear_flags") of a */
emilmont 6:350b53afb889 125 /* selectable task (identified by "task"). */
emilmont 6:350b53afb889 126 P_TCB task = os_active_TCB[task_id-1];
emilmont 6:350b53afb889 127
emilmont 6:350b53afb889 128 if (task == NULL) {
emilmont 6:350b53afb889 129 return;
emilmont 6:350b53afb889 130 }
emilmont 6:350b53afb889 131 task->events &= ~clear_flags;
emilmont 6:350b53afb889 132 }
emilmont 6:350b53afb889 133
emilmont 6:350b53afb889 134
emilmont 6:350b53afb889 135 /*--------------------------- isr_evt_set -----------------------------------*/
emilmont 6:350b53afb889 136
emilmont 6:350b53afb889 137 void isr_evt_set (U16 event_flags, OS_TID task_id) {
emilmont 6:350b53afb889 138 /* Same function as "os_evt_set", but to be called by ISRs. */
emilmont 6:350b53afb889 139 P_TCB p_tcb = os_active_TCB[task_id-1];
emilmont 6:350b53afb889 140
emilmont 6:350b53afb889 141 if (p_tcb == NULL) {
emilmont 6:350b53afb889 142 return;
emilmont 6:350b53afb889 143 }
emilmont 6:350b53afb889 144 rt_psq_enq (p_tcb, event_flags);
emilmont 6:350b53afb889 145 rt_psh_req ();
emilmont 6:350b53afb889 146 }
emilmont 6:350b53afb889 147
emilmont 6:350b53afb889 148
emilmont 6:350b53afb889 149 /*--------------------------- rt_evt_get ------------------------------------*/
emilmont 6:350b53afb889 150
emilmont 6:350b53afb889 151 U16 rt_evt_get (void) {
emilmont 6:350b53afb889 152 /* Get events of a running task after waiting for OR connected events. */
emilmont 6:350b53afb889 153 return (os_tsk.run->waits);
emilmont 6:350b53afb889 154 }
emilmont 6:350b53afb889 155
emilmont 6:350b53afb889 156
emilmont 6:350b53afb889 157 /*--------------------------- rt_evt_psh ------------------------------------*/
emilmont 6:350b53afb889 158
emilmont 6:350b53afb889 159 void rt_evt_psh (P_TCB p_CB, U16 set_flags) {
emilmont 6:350b53afb889 160 /* Check if task has to be waken up */
emilmont 6:350b53afb889 161 U16 event_flags;
emilmont 6:350b53afb889 162
emilmont 6:350b53afb889 163 p_CB->events |= set_flags;
emilmont 6:350b53afb889 164 event_flags = p_CB->waits;
emilmont 6:350b53afb889 165 if (p_CB->state == WAIT_AND) {
emilmont 6:350b53afb889 166 /* Check for AND-connected events */
emilmont 6:350b53afb889 167 if ((p_CB->events & event_flags) == event_flags) {
emilmont 6:350b53afb889 168 goto rdy;
emilmont 6:350b53afb889 169 }
emilmont 6:350b53afb889 170 }
emilmont 6:350b53afb889 171 if (p_CB->state == WAIT_OR) {
emilmont 6:350b53afb889 172 /* Check for OR-connected events */
emilmont 6:350b53afb889 173 if (p_CB->events & event_flags) {
emilmont 6:350b53afb889 174 p_CB->waits &= p_CB->events;
emilmont 6:350b53afb889 175 rdy: p_CB->events &= ~event_flags;
emilmont 6:350b53afb889 176 rt_rmv_dly (p_CB);
emilmont 6:350b53afb889 177 p_CB->state = READY;
emilmont 6:350b53afb889 178 #ifdef __CMSIS_RTOS
emilmont 6:350b53afb889 179 rt_ret_val2(p_CB, 0x08/*osEventSignal*/, p_CB->waits);
emilmont 6:350b53afb889 180 #else
emilmont 6:350b53afb889 181 rt_ret_val (p_CB, OS_R_EVT);
emilmont 6:350b53afb889 182 #endif
emilmont 6:350b53afb889 183 rt_put_prio (&os_rdy, p_CB);
emilmont 6:350b53afb889 184 }
emilmont 6:350b53afb889 185 }
emilmont 6:350b53afb889 186 }
emilmont 6:350b53afb889 187
emilmont 6:350b53afb889 188 /*----------------------------------------------------------------------------
emilmont 6:350b53afb889 189 * end of file
emilmont 6:350b53afb889 190 *---------------------------------------------------------------------------*/