erkin yucel / mbed-os

mbed os with nrf51 internal bandgap enabled to read battery level

Dependents:   BLE_file_test BLE_Blink ExternalEncoder

rtos/rtx/TARGET_ARM7/rt_Semaphore.c@0:f269e3021894, 2016-10-23 (annotated)

Committer:
elessair
Date:
Sun Oct 23 15:10:02 2016 +0000
Revision:
0:f269e3021894
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elessair 0:f269e3021894 1 /*----------------------------------------------------------------------------
elessair 0:f269e3021894 2 * RL-ARM - RTX
elessair 0:f269e3021894 3 *----------------------------------------------------------------------------
elessair 0:f269e3021894 4 * Name: RT_SEMAPHORE.C
elessair 0:f269e3021894 5 * Purpose: Implements binary and counting semaphores
elessair 0:f269e3021894 6 * Rev.: V4.60
elessair 0:f269e3021894 7 *----------------------------------------------------------------------------
elessair 0:f269e3021894 8 *
elessair 0:f269e3021894 9 * Copyright (c) 1999-2009 KEIL, 2009-2015 ARM Germany GmbH
elessair 0:f269e3021894 10 * All rights reserved.
elessair 0:f269e3021894 11 * Redistribution and use in source and binary forms, with or without
elessair 0:f269e3021894 12 * modification, are permitted provided that the following conditions are met:
elessair 0:f269e3021894 13 * - Redistributions of source code must retain the above copyright
elessair 0:f269e3021894 14 * notice, this list of conditions and the following disclaimer.
elessair 0:f269e3021894 15 * - Redistributions in binary form must reproduce the above copyright
elessair 0:f269e3021894 16 * notice, this list of conditions and the following disclaimer in the
elessair 0:f269e3021894 17 * documentation and/or other materials provided with the distribution.
elessair 0:f269e3021894 18 * - Neither the name of ARM nor the names of its contributors may be used
elessair 0:f269e3021894 19 * to endorse or promote products derived from this software without
elessair 0:f269e3021894 20 * specific prior written permission.
elessair 0:f269e3021894 21 *
elessair 0:f269e3021894 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
elessair 0:f269e3021894 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
elessair 0:f269e3021894 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
elessair 0:f269e3021894 25 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
elessair 0:f269e3021894 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
elessair 0:f269e3021894 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
elessair 0:f269e3021894 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
elessair 0:f269e3021894 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
elessair 0:f269e3021894 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
elessair 0:f269e3021894 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
elessair 0:f269e3021894 32 * POSSIBILITY OF SUCH DAMAGE.
elessair 0:f269e3021894 33 *---------------------------------------------------------------------------*/
elessair 0:f269e3021894 34
elessair 0:f269e3021894 35 #include "rt_TypeDef.h"
elessair 0:f269e3021894 36 #include "RTX_Conf.h"
elessair 0:f269e3021894 37 #include "rt_System.h"
elessair 0:f269e3021894 38 #include "rt_List.h"
elessair 0:f269e3021894 39 #include "rt_Task.h"
elessair 0:f269e3021894 40 #include "rt_Semaphore.h"
elessair 0:f269e3021894 41 #include "rt_HAL_CM.h"
elessair 0:f269e3021894 42
elessair 0:f269e3021894 43
elessair 0:f269e3021894 44 /*----------------------------------------------------------------------------
elessair 0:f269e3021894 45 * Functions
elessair 0:f269e3021894 46 *---------------------------------------------------------------------------*/
elessair 0:f269e3021894 47
elessair 0:f269e3021894 48
elessair 0:f269e3021894 49 /*--------------------------- rt_sem_init -----------------------------------*/
elessair 0:f269e3021894 50
elessair 0:f269e3021894 51 void rt_sem_init (OS_ID semaphore, U16 token_count) {
elessair 0:f269e3021894 52 /* Initialize a semaphore */
elessair 0:f269e3021894 53 P_SCB p_SCB = semaphore;
elessair 0:f269e3021894 54
elessair 0:f269e3021894 55 p_SCB->cb_type = SCB;
elessair 0:f269e3021894 56 p_SCB->p_lnk = NULL;
elessair 0:f269e3021894 57 p_SCB->tokens = token_count;
elessair 0:f269e3021894 58 }
elessair 0:f269e3021894 59
elessair 0:f269e3021894 60
elessair 0:f269e3021894 61 /*--------------------------- rt_sem_delete ---------------------------------*/
elessair 0:f269e3021894 62
elessair 0:f269e3021894 63 #ifdef __CMSIS_RTOS
elessair 0:f269e3021894 64 OS_RESULT rt_sem_delete (OS_ID semaphore) {
elessair 0:f269e3021894 65 /* Delete semaphore */
elessair 0:f269e3021894 66 P_SCB p_SCB = semaphore;
elessair 0:f269e3021894 67 P_TCB p_TCB;
elessair 0:f269e3021894 68
elessair 0:f269e3021894 69 while (p_SCB->p_lnk != NULL) {
elessair 0:f269e3021894 70 /* A task is waiting for token */
elessair 0:f269e3021894 71 p_TCB = rt_get_first ((P_XCB)p_SCB);
elessair 0:f269e3021894 72 rt_ret_val(p_TCB, 0);
elessair 0:f269e3021894 73 rt_rmv_dly(p_TCB);
elessair 0:f269e3021894 74 p_TCB->state = READY;
elessair 0:f269e3021894 75 rt_put_prio (&os_rdy, p_TCB);
elessair 0:f269e3021894 76 }
elessair 0:f269e3021894 77
elessair 0:f269e3021894 78 if (os_rdy.p_lnk && (os_rdy.p_lnk->prio > os_tsk.run->prio)) {
elessair 0:f269e3021894 79 /* preempt running task */
elessair 0:f269e3021894 80 rt_put_prio (&os_rdy, os_tsk.run);
elessair 0:f269e3021894 81 os_tsk.run->state = READY;
elessair 0:f269e3021894 82 rt_dispatch (NULL);
elessair 0:f269e3021894 83 }
elessair 0:f269e3021894 84
elessair 0:f269e3021894 85 p_SCB->cb_type = 0;
elessair 0:f269e3021894 86
elessair 0:f269e3021894 87 return (OS_R_OK);
elessair 0:f269e3021894 88 }
elessair 0:f269e3021894 89 #endif
elessair 0:f269e3021894 90
elessair 0:f269e3021894 91
elessair 0:f269e3021894 92 /*--------------------------- rt_sem_send -----------------------------------*/
elessair 0:f269e3021894 93
elessair 0:f269e3021894 94 OS_RESULT rt_sem_send (OS_ID semaphore) {
elessair 0:f269e3021894 95 /* Return a token to semaphore */
elessair 0:f269e3021894 96 P_SCB p_SCB = semaphore;
elessair 0:f269e3021894 97 P_TCB p_TCB;
elessair 0:f269e3021894 98
elessair 0:f269e3021894 99 if (p_SCB->p_lnk != NULL) {
elessair 0:f269e3021894 100 /* A task is waiting for token */
elessair 0:f269e3021894 101 p_TCB = rt_get_first ((P_XCB)p_SCB);
elessair 0:f269e3021894 102 #ifdef __CMSIS_RTOS
elessair 0:f269e3021894 103 rt_ret_val(p_TCB, 1);
elessair 0:f269e3021894 104 #else
elessair 0:f269e3021894 105 rt_ret_val(p_TCB, OS_R_SEM);
elessair 0:f269e3021894 106 #endif
elessair 0:f269e3021894 107 rt_rmv_dly (p_TCB);
elessair 0:f269e3021894 108 rt_dispatch (p_TCB);
elessair 0:f269e3021894 109 }
elessair 0:f269e3021894 110 else {
elessair 0:f269e3021894 111 /* Store token. */
elessair 0:f269e3021894 112 p_SCB->tokens++;
elessair 0:f269e3021894 113 }
elessair 0:f269e3021894 114 return (OS_R_OK);
elessair 0:f269e3021894 115 }
elessair 0:f269e3021894 116
elessair 0:f269e3021894 117
elessair 0:f269e3021894 118 /*--------------------------- rt_sem_wait -----------------------------------*/
elessair 0:f269e3021894 119
elessair 0:f269e3021894 120 OS_RESULT rt_sem_wait (OS_ID semaphore, U16 timeout) {
elessair 0:f269e3021894 121 /* Obtain a token; possibly wait for it */
elessair 0:f269e3021894 122 P_SCB p_SCB = semaphore;
elessair 0:f269e3021894 123
elessair 0:f269e3021894 124 if (p_SCB->tokens) {
elessair 0:f269e3021894 125 p_SCB->tokens--;
elessair 0:f269e3021894 126 return (OS_R_OK);
elessair 0:f269e3021894 127 }
elessair 0:f269e3021894 128 /* No token available: wait for one */
elessair 0:f269e3021894 129 if (timeout == 0) {
elessair 0:f269e3021894 130 return (OS_R_TMO);
elessair 0:f269e3021894 131 }
elessair 0:f269e3021894 132 if (p_SCB->p_lnk != NULL) {
elessair 0:f269e3021894 133 rt_put_prio ((P_XCB)p_SCB, os_tsk.run);
elessair 0:f269e3021894 134 }
elessair 0:f269e3021894 135 else {
elessair 0:f269e3021894 136 p_SCB->p_lnk = os_tsk.run;
elessair 0:f269e3021894 137 os_tsk.run->p_lnk = NULL;
elessair 0:f269e3021894 138 os_tsk.run->p_rlnk = (P_TCB)p_SCB;
elessair 0:f269e3021894 139 }
elessair 0:f269e3021894 140 rt_block(timeout, WAIT_SEM);
elessair 0:f269e3021894 141 return (OS_R_TMO);
elessair 0:f269e3021894 142 }
elessair 0:f269e3021894 143
elessair 0:f269e3021894 144
elessair 0:f269e3021894 145 /*--------------------------- isr_sem_send ----------------------------------*/
elessair 0:f269e3021894 146
elessair 0:f269e3021894 147 void isr_sem_send (OS_ID semaphore) {
elessair 0:f269e3021894 148 /* Same function as "os_sem"send", but to be called by ISRs */
elessair 0:f269e3021894 149 P_SCB p_SCB = semaphore;
elessair 0:f269e3021894 150
elessair 0:f269e3021894 151 rt_psq_enq (p_SCB, 0);
elessair 0:f269e3021894 152 rt_psh_req ();
elessair 0:f269e3021894 153 }
elessair 0:f269e3021894 154
elessair 0:f269e3021894 155
elessair 0:f269e3021894 156 /*--------------------------- rt_sem_psh ------------------------------------*/
elessair 0:f269e3021894 157
elessair 0:f269e3021894 158 void rt_sem_psh (P_SCB p_CB) {
elessair 0:f269e3021894 159 /* Check if task has to be waken up */
elessair 0:f269e3021894 160 P_TCB p_TCB;
elessair 0:f269e3021894 161
elessair 0:f269e3021894 162 if (p_CB->p_lnk != NULL) {
elessair 0:f269e3021894 163 /* A task is waiting for token */
elessair 0:f269e3021894 164 p_TCB = rt_get_first ((P_XCB)p_CB);
elessair 0:f269e3021894 165 rt_rmv_dly (p_TCB);
elessair 0:f269e3021894 166 p_TCB->state = READY;
elessair 0:f269e3021894 167 #ifdef __CMSIS_RTOS
elessair 0:f269e3021894 168 rt_ret_val(p_TCB, 1);
elessair 0:f269e3021894 169 #else
elessair 0:f269e3021894 170 rt_ret_val(p_TCB, OS_R_SEM);
elessair 0:f269e3021894 171 #endif
elessair 0:f269e3021894 172 rt_put_prio (&os_rdy, p_TCB);
elessair 0:f269e3021894 173 }
elessair 0:f269e3021894 174 else {
elessair 0:f269e3021894 175 /* Store token */
elessair 0:f269e3021894 176 p_CB->tokens++;
elessair 0:f269e3021894 177 }
elessair 0:f269e3021894 178 }
elessair 0:f269e3021894 179
elessair 0:f269e3021894 180 /*----------------------------------------------------------------------------
elessair 0:f269e3021894 181 * end of file
elessair 0:f269e3021894 182 *---------------------------------------------------------------------------*/
elessair 0:f269e3021894 183