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mbed library sources. Supersedes mbed-src.

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targets/TARGET_Maxim/TARGET_MAX32620C/mxc/wdt.c@189:f392fc9709a3, 2019-02-20 (annotated)

Committer:
AnnaBridge
Date:
Wed Feb 20 22:31:08 2019 +0000
Revision:
189:f392fc9709a3
Parent:
186:707f6e361f3e 
mbed library release version 165

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Anna Bridge 186:707f6e361f3e 1 /**
Anna Bridge 186:707f6e361f3e 2 * @file
Anna Bridge 186:707f6e361f3e 3 * @brief Watchdog driver source.
Anna Bridge 186:707f6e361f3e 4 */
Anna Bridge 186:707f6e361f3e 5 /* *****************************************************************************
Anna Bridge 186:707f6e361f3e 6 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
Anna Bridge 186:707f6e361f3e 7 *
Anna Bridge 186:707f6e361f3e 8 * Permission is hereby granted, free of charge, to any person obtaining a
Anna Bridge 186:707f6e361f3e 9 * copy of this software and associated documentation files (the "Software"),
Anna Bridge 186:707f6e361f3e 10 * to deal in the Software without restriction, including without limitation
Anna Bridge 186:707f6e361f3e 11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
Anna Bridge 186:707f6e361f3e 12 * and/or sell copies of the Software, and to permit persons to whom the
Anna Bridge 186:707f6e361f3e 13 * Software is furnished to do so, subject to the following conditions:
Anna Bridge 186:707f6e361f3e 14 *
Anna Bridge 186:707f6e361f3e 15 * The above copyright notice and this permission notice shall be included
Anna Bridge 186:707f6e361f3e 16 * in all copies or substantial portions of the Software.
Anna Bridge 186:707f6e361f3e 17 *
Anna Bridge 186:707f6e361f3e 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
Anna Bridge 186:707f6e361f3e 19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
Anna Bridge 186:707f6e361f3e 20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
Anna Bridge 186:707f6e361f3e 21 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
Anna Bridge 186:707f6e361f3e 22 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
Anna Bridge 186:707f6e361f3e 23 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
Anna Bridge 186:707f6e361f3e 24 * OTHER DEALINGS IN THE SOFTWARE.
Anna Bridge 186:707f6e361f3e 25 *
Anna Bridge 186:707f6e361f3e 26 * Except as contained in this notice, the name of Maxim Integrated
Anna Bridge 186:707f6e361f3e 27 * Products, Inc. shall not be used except as stated in the Maxim Integrated
Anna Bridge 186:707f6e361f3e 28 * Products, Inc. Branding Policy.
Anna Bridge 186:707f6e361f3e 29 *
Anna Bridge 186:707f6e361f3e 30 * The mere transfer of this software does not imply any licenses
Anna Bridge 186:707f6e361f3e 31 * of trade secrets, proprietary technology, copyrights, patents,
Anna Bridge 186:707f6e361f3e 32 * trademarks, maskwork rights, or any other form of intellectual
Anna Bridge 186:707f6e361f3e 33 * property whatsoever. Maxim Integrated Products, Inc. retains all
Anna Bridge 186:707f6e361f3e 34 * ownership rights.
Anna Bridge 186:707f6e361f3e 35 *
Anna Bridge 186:707f6e361f3e 36 * $Date: 2016-09-08 17:27:05 -0500 (Thu, 08 Sep 2016) $
Anna Bridge 186:707f6e361f3e 37 * $Revision: 24321 $
Anna Bridge 186:707f6e361f3e 38 *
Anna Bridge 186:707f6e361f3e 39 **************************************************************************** */
Anna Bridge 186:707f6e361f3e 40
Anna Bridge 186:707f6e361f3e 41 /* **** Includes **** */
Anna Bridge 186:707f6e361f3e 42 #include <stddef.h>
Anna Bridge 186:707f6e361f3e 43 #include "wdt.h"
Anna Bridge 186:707f6e361f3e 44 /**
Anna Bridge 186:707f6e361f3e 45 * @ingroup wdt
Anna Bridge 186:707f6e361f3e 46 * @{
Anna Bridge 186:707f6e361f3e 47 */
Anna Bridge 186:707f6e361f3e 48 static uint32_t interruptEnable = 0; //keeps track to interrupts to enable in start function
Anna Bridge 186:707f6e361f3e 49
Anna Bridge 186:707f6e361f3e 50 /* ************************************************************************* */
Anna Bridge 186:707f6e361f3e 51 int WDT_Init(mxc_wdt_regs_t *wdt, const sys_cfg_wdt_t *cfg, uint8_t unlock_key)
Anna Bridge 186:707f6e361f3e 52 {
Anna Bridge 186:707f6e361f3e 53 if ((wdt == NULL) || (cfg == NULL))
Anna Bridge 186:707f6e361f3e 54 return E_NULL_PTR;
Anna Bridge 186:707f6e361f3e 55
Anna Bridge 186:707f6e361f3e 56 //setup watchdog clock
Anna Bridge 186:707f6e361f3e 57 SYS_WDT_Init(wdt, cfg);
Anna Bridge 186:707f6e361f3e 58
Anna Bridge 186:707f6e361f3e 59 //unlock ctrl to be writable
Anna Bridge 186:707f6e361f3e 60 wdt->lock_ctrl = unlock_key;
Anna Bridge 186:707f6e361f3e 61
Anna Bridge 186:707f6e361f3e 62 //check to make sure it unlocked
Anna Bridge 186:707f6e361f3e 63 if (wdt->lock_ctrl & 0x01)
Anna Bridge 186:707f6e361f3e 64 return E_BAD_STATE;
Anna Bridge 186:707f6e361f3e 65
Anna Bridge 186:707f6e361f3e 66 //disable all interrupts
Anna Bridge 186:707f6e361f3e 67 interruptEnable = 0;
Anna Bridge 186:707f6e361f3e 68 wdt->enable = interruptEnable;
Anna Bridge 186:707f6e361f3e 69
Anna Bridge 186:707f6e361f3e 70 //enable the watchdog clock and clear all other settings
Anna Bridge 186:707f6e361f3e 71 wdt->ctrl = MXC_F_WDT_CTRL_EN_CLOCK;
Anna Bridge 186:707f6e361f3e 72
Anna Bridge 186:707f6e361f3e 73 //clear all interrupt flags
Anna Bridge 186:707f6e361f3e 74 wdt->flags = WDT_FLAGS_CLEAR_ALL;
Anna Bridge 186:707f6e361f3e 75
Anna Bridge 186:707f6e361f3e 76 //lock ctrl to read-only
Anna Bridge 186:707f6e361f3e 77 wdt->lock_ctrl = MXC_V_WDT_LOCK_KEY;
Anna Bridge 186:707f6e361f3e 78
Anna Bridge 186:707f6e361f3e 79 return E_NO_ERROR;
Anna Bridge 186:707f6e361f3e 80 }
Anna Bridge 186:707f6e361f3e 81
Anna Bridge 186:707f6e361f3e 82 /* ************************************************************************* */
Anna Bridge 186:707f6e361f3e 83 int WDT_EnableInt(mxc_wdt_regs_t *wdt, wdt_period_t int_period, uint8_t unlock_key)
Anna Bridge 186:707f6e361f3e 84 {
Anna Bridge 186:707f6e361f3e 85 //unlock ctrl to be writable
Anna Bridge 186:707f6e361f3e 86 wdt->lock_ctrl = unlock_key;
Anna Bridge 186:707f6e361f3e 87
Anna Bridge 186:707f6e361f3e 88 //check to make sure it unlocked
Anna Bridge 186:707f6e361f3e 89 if (wdt->lock_ctrl & 0x01)
Anna Bridge 186:707f6e361f3e 90 return E_BAD_STATE;
Anna Bridge 186:707f6e361f3e 91
Anna Bridge 186:707f6e361f3e 92 //stop timer and clear interval period
Anna Bridge 186:707f6e361f3e 93 wdt->ctrl &= ~(MXC_F_WDT_CTRL_INT_PERIOD | MXC_F_WDT_CTRL_EN_TIMER);
Anna Bridge 186:707f6e361f3e 94
Anna Bridge 186:707f6e361f3e 95 //set interval period
Anna Bridge 186:707f6e361f3e 96 wdt->ctrl |= (int_period << MXC_F_WDT_CTRL_INT_PERIOD_POS);
Anna Bridge 186:707f6e361f3e 97
Anna Bridge 186:707f6e361f3e 98 //enable timeout interrupt
Anna Bridge 186:707f6e361f3e 99 interruptEnable |= MXC_F_WDT_ENABLE_TIMEOUT;
Anna Bridge 186:707f6e361f3e 100
Anna Bridge 186:707f6e361f3e 101 //lock ctrl to read-only
Anna Bridge 186:707f6e361f3e 102 wdt->lock_ctrl = MXC_V_WDT_LOCK_KEY;
Anna Bridge 186:707f6e361f3e 103
Anna Bridge 186:707f6e361f3e 104 return E_NO_ERROR;
Anna Bridge 186:707f6e361f3e 105 }
Anna Bridge 186:707f6e361f3e 106
Anna Bridge 186:707f6e361f3e 107 /* ************************************************************************* */
Anna Bridge 186:707f6e361f3e 108 int WDT_DisableInt(mxc_wdt_regs_t *wdt, uint8_t unlock_key)
Anna Bridge 186:707f6e361f3e 109 {
Anna Bridge 186:707f6e361f3e 110 //unlock register to be writable
Anna Bridge 186:707f6e361f3e 111 wdt->lock_ctrl = unlock_key;
Anna Bridge 186:707f6e361f3e 112
Anna Bridge 186:707f6e361f3e 113 //check to make sure it unlocked
Anna Bridge 186:707f6e361f3e 114 if (wdt->lock_ctrl & 0x01)
Anna Bridge 186:707f6e361f3e 115 return E_BAD_STATE;
Anna Bridge 186:707f6e361f3e 116
Anna Bridge 186:707f6e361f3e 117 //disable timeout interrupt
Anna Bridge 186:707f6e361f3e 118 interruptEnable &= ~MXC_F_WDT_ENABLE_TIMEOUT;
Anna Bridge 186:707f6e361f3e 119 wdt->enable = interruptEnable;
Anna Bridge 186:707f6e361f3e 120
Anna Bridge 186:707f6e361f3e 121 //lock register to read-only
Anna Bridge 186:707f6e361f3e 122 wdt->lock_ctrl = MXC_V_WDT_LOCK_KEY;
Anna Bridge 186:707f6e361f3e 123
Anna Bridge 186:707f6e361f3e 124 return E_NO_ERROR;
Anna Bridge 186:707f6e361f3e 125 }
Anna Bridge 186:707f6e361f3e 126
Anna Bridge 186:707f6e361f3e 127 /* ************************************************************************* */
Anna Bridge 186:707f6e361f3e 128 int WDT_EnableWait(mxc_wdt_regs_t *wdt, wdt_period_t wait_period, uint8_t unlock_key)
Anna Bridge 186:707f6e361f3e 129 {
Anna Bridge 186:707f6e361f3e 130 // Make sure wait_period is valid
Anna Bridge 186:707f6e361f3e 131 if (wait_period >= WDT_PERIOD_MAX)
Anna Bridge 186:707f6e361f3e 132 return E_INVALID;
Anna Bridge 186:707f6e361f3e 133
Anna Bridge 186:707f6e361f3e 134 //unlock ctrl to be writable
Anna Bridge 186:707f6e361f3e 135 wdt->lock_ctrl = unlock_key;
Anna Bridge 186:707f6e361f3e 136
Anna Bridge 186:707f6e361f3e 137 //check to make sure it unlocked
Anna Bridge 186:707f6e361f3e 138 if (wdt->lock_ctrl & 0x01)
Anna Bridge 186:707f6e361f3e 139 return E_BAD_STATE;
Anna Bridge 186:707f6e361f3e 140
Anna Bridge 186:707f6e361f3e 141 //stop timer and clear wait period
Anna Bridge 186:707f6e361f3e 142 wdt->ctrl &= ~(MXC_F_WDT_CTRL_WAIT_PERIOD | MXC_F_WDT_CTRL_EN_TIMER);
Anna Bridge 186:707f6e361f3e 143
Anna Bridge 186:707f6e361f3e 144 //set wait period
Anna Bridge 186:707f6e361f3e 145 wdt->ctrl |= (wait_period << MXC_F_WDT_CTRL_WAIT_PERIOD_POS);
Anna Bridge 186:707f6e361f3e 146
Anna Bridge 186:707f6e361f3e 147 //enable wait interrupt
Anna Bridge 186:707f6e361f3e 148 interruptEnable |= MXC_F_WDT_ENABLE_PRE_WIN;
Anna Bridge 186:707f6e361f3e 149
Anna Bridge 186:707f6e361f3e 150 //lock ctrl to read-only
Anna Bridge 186:707f6e361f3e 151 wdt->lock_ctrl = MXC_V_WDT_LOCK_KEY;
Anna Bridge 186:707f6e361f3e 152
Anna Bridge 186:707f6e361f3e 153 return E_NO_ERROR;
Anna Bridge 186:707f6e361f3e 154 }
Anna Bridge 186:707f6e361f3e 155
Anna Bridge 186:707f6e361f3e 156 /* ************************************************************************* */
Anna Bridge 186:707f6e361f3e 157 int WDT_DisableWait(mxc_wdt_regs_t *wdt, uint8_t unlock_key)
Anna Bridge 186:707f6e361f3e 158 {
Anna Bridge 186:707f6e361f3e 159 //unlock register to be writable
Anna Bridge 186:707f6e361f3e 160 wdt->lock_ctrl = unlock_key;
Anna Bridge 186:707f6e361f3e 161
Anna Bridge 186:707f6e361f3e 162 //check to make sure it unlocked
Anna Bridge 186:707f6e361f3e 163 if (wdt->lock_ctrl & 0x01)
Anna Bridge 186:707f6e361f3e 164 return E_BAD_STATE;
Anna Bridge 186:707f6e361f3e 165
Anna Bridge 186:707f6e361f3e 166 //disable wait interrupt
Anna Bridge 186:707f6e361f3e 167 interruptEnable &= ~MXC_F_WDT_ENABLE_PRE_WIN;
Anna Bridge 186:707f6e361f3e 168 wdt->enable = interruptEnable;
Anna Bridge 186:707f6e361f3e 169
Anna Bridge 186:707f6e361f3e 170 //lock register to read-only
Anna Bridge 186:707f6e361f3e 171 wdt->lock_ctrl = MXC_V_WDT_LOCK_KEY;
Anna Bridge 186:707f6e361f3e 172
Anna Bridge 186:707f6e361f3e 173 return E_NO_ERROR;
Anna Bridge 186:707f6e361f3e 174 }
Anna Bridge 186:707f6e361f3e 175
Anna Bridge 186:707f6e361f3e 176 /* ************************************************************************* */
Anna Bridge 186:707f6e361f3e 177 int WDT_EnableReset(mxc_wdt_regs_t *wdt, wdt_period_t rst_period, uint8_t unlock_key)
Anna Bridge 186:707f6e361f3e 178 {
Anna Bridge 186:707f6e361f3e 179 // Make sure wait_period is valid
Anna Bridge 186:707f6e361f3e 180 if (rst_period >= WDT_PERIOD_MAX)
Anna Bridge 186:707f6e361f3e 181 return E_INVALID;
Anna Bridge 186:707f6e361f3e 182
Anna Bridge 186:707f6e361f3e 183 //unlock ctrl to be writable
Anna Bridge 186:707f6e361f3e 184 wdt->lock_ctrl = unlock_key;
Anna Bridge 186:707f6e361f3e 185
Anna Bridge 186:707f6e361f3e 186 //check to make sure it unlocked
Anna Bridge 186:707f6e361f3e 187 if (wdt->lock_ctrl & 0x01)
Anna Bridge 186:707f6e361f3e 188 return E_BAD_STATE;
Anna Bridge 186:707f6e361f3e 189
Anna Bridge 186:707f6e361f3e 190 //stop timer and clear reset period
Anna Bridge 186:707f6e361f3e 191 wdt->ctrl &= ~(MXC_F_WDT_CTRL_RST_PERIOD | MXC_F_WDT_CTRL_EN_TIMER);
Anna Bridge 186:707f6e361f3e 192
Anna Bridge 186:707f6e361f3e 193 //set reset period
Anna Bridge 186:707f6e361f3e 194 wdt->ctrl |= (rst_period << MXC_F_WDT_CTRL_RST_PERIOD_POS);
Anna Bridge 186:707f6e361f3e 195
Anna Bridge 186:707f6e361f3e 196 //enable reset0
Anna Bridge 186:707f6e361f3e 197 interruptEnable |= MXC_F_WDT_ENABLE_RESET_OUT;
Anna Bridge 186:707f6e361f3e 198
Anna Bridge 186:707f6e361f3e 199 //lock ctrl to read-only
Anna Bridge 186:707f6e361f3e 200 wdt->lock_ctrl = MXC_V_WDT_LOCK_KEY;
Anna Bridge 186:707f6e361f3e 201
Anna Bridge 186:707f6e361f3e 202 return E_NO_ERROR;
Anna Bridge 186:707f6e361f3e 203 }
Anna Bridge 186:707f6e361f3e 204
Anna Bridge 186:707f6e361f3e 205 /* ************************************************************************* */
Anna Bridge 186:707f6e361f3e 206 int WDT_DisableReset(mxc_wdt_regs_t *wdt, uint8_t unlock_key)
Anna Bridge 186:707f6e361f3e 207 {
Anna Bridge 186:707f6e361f3e 208 //unlock register to be writable
Anna Bridge 186:707f6e361f3e 209 wdt->lock_ctrl = unlock_key;
Anna Bridge 186:707f6e361f3e 210
Anna Bridge 186:707f6e361f3e 211 //check to make sure it unlocked
Anna Bridge 186:707f6e361f3e 212 if (wdt->lock_ctrl & 0x01)
Anna Bridge 186:707f6e361f3e 213 return E_BAD_STATE;
Anna Bridge 186:707f6e361f3e 214
Anna Bridge 186:707f6e361f3e 215 //disable reset0
Anna Bridge 186:707f6e361f3e 216 interruptEnable &= ~MXC_F_WDT_ENABLE_RESET_OUT;
Anna Bridge 186:707f6e361f3e 217 wdt->enable = interruptEnable;
Anna Bridge 186:707f6e361f3e 218
Anna Bridge 186:707f6e361f3e 219 //lock register to read-only
Anna Bridge 186:707f6e361f3e 220 wdt->lock_ctrl = MXC_V_WDT_LOCK_KEY;
Anna Bridge 186:707f6e361f3e 221
Anna Bridge 186:707f6e361f3e 222 return E_NO_ERROR;
Anna Bridge 186:707f6e361f3e 223 }
Anna Bridge 186:707f6e361f3e 224
Anna Bridge 186:707f6e361f3e 225 /* ************************************************************************* */
Anna Bridge 186:707f6e361f3e 226 int WDT_Start(mxc_wdt_regs_t *wdt, uint8_t unlock_key)
Anna Bridge 186:707f6e361f3e 227 {
Anna Bridge 186:707f6e361f3e 228 //check if watchdog is already running
Anna Bridge 186:707f6e361f3e 229 if(WDT_IsActive(wdt))
Anna Bridge 186:707f6e361f3e 230 return E_BAD_STATE;
Anna Bridge 186:707f6e361f3e 231
Anna Bridge 186:707f6e361f3e 232 //unlock ctrl to be writable
Anna Bridge 186:707f6e361f3e 233 wdt->lock_ctrl = unlock_key;
Anna Bridge 186:707f6e361f3e 234
Anna Bridge 186:707f6e361f3e 235 //check to make sure it unlocked
Anna Bridge 186:707f6e361f3e 236 if (wdt->lock_ctrl & 0x01)
Anna Bridge 186:707f6e361f3e 237 return E_BAD_STATE;
Anna Bridge 186:707f6e361f3e 238
Anna Bridge 186:707f6e361f3e 239 WDT_Reset(wdt);
Anna Bridge 186:707f6e361f3e 240
Anna Bridge 186:707f6e361f3e 241 //enable interrupts
Anna Bridge 186:707f6e361f3e 242 wdt->enable = interruptEnable;
Anna Bridge 186:707f6e361f3e 243
Anna Bridge 186:707f6e361f3e 244 //start timer
Anna Bridge 186:707f6e361f3e 245 wdt->ctrl |= MXC_F_WDT_CTRL_EN_TIMER;
Anna Bridge 186:707f6e361f3e 246
Anna Bridge 186:707f6e361f3e 247 //lock ctrl to read-only
Anna Bridge 186:707f6e361f3e 248 wdt->lock_ctrl = MXC_V_WDT_LOCK_KEY;
Anna Bridge 186:707f6e361f3e 249
Anna Bridge 186:707f6e361f3e 250 return E_NO_ERROR;
Anna Bridge 186:707f6e361f3e 251 }
Anna Bridge 186:707f6e361f3e 252
Anna Bridge 186:707f6e361f3e 253 /* ************************************************************************* */
Anna Bridge 186:707f6e361f3e 254 void WDT_Reset(mxc_wdt_regs_t *wdt)
Anna Bridge 186:707f6e361f3e 255 {
Anna Bridge 186:707f6e361f3e 256 //reset the watchdog counter
Anna Bridge 186:707f6e361f3e 257 wdt->clear = MXC_V_WDT_RESET_KEY_0;
Anna Bridge 186:707f6e361f3e 258 wdt->clear = MXC_V_WDT_RESET_KEY_1;
Anna Bridge 186:707f6e361f3e 259
Anna Bridge 186:707f6e361f3e 260 //clear all interrupt flags
Anna Bridge 186:707f6e361f3e 261 wdt->flags = WDT_FLAGS_CLEAR_ALL;
Anna Bridge 186:707f6e361f3e 262
Anna Bridge 186:707f6e361f3e 263 //wait for all interrupts to clear
Anna Bridge 186:707f6e361f3e 264 while(wdt->flags != 0) {
Anna Bridge 186:707f6e361f3e 265 wdt->flags = WDT_FLAGS_CLEAR_ALL;
Anna Bridge 186:707f6e361f3e 266 }
Anna Bridge 186:707f6e361f3e 267
Anna Bridge 186:707f6e361f3e 268 return;
Anna Bridge 186:707f6e361f3e 269 }
Anna Bridge 186:707f6e361f3e 270
Anna Bridge 186:707f6e361f3e 271 /* ************************************************************************* */
Anna Bridge 186:707f6e361f3e 272 int WDT_Stop(mxc_wdt_regs_t *wdt, uint8_t unlock_key)
Anna Bridge 186:707f6e361f3e 273 {
Anna Bridge 186:707f6e361f3e 274 //unlock ctrl to be writable
Anna Bridge 186:707f6e361f3e 275 wdt->lock_ctrl = unlock_key;
Anna Bridge 186:707f6e361f3e 276
Anna Bridge 186:707f6e361f3e 277 //check to make sure it unlocked
Anna Bridge 186:707f6e361f3e 278 if (wdt->lock_ctrl & 0x01)
Anna Bridge 186:707f6e361f3e 279 return E_BAD_STATE;
Anna Bridge 186:707f6e361f3e 280
Anna Bridge 186:707f6e361f3e 281 //disabled the timer and interrupts
Anna Bridge 186:707f6e361f3e 282 wdt->enable = 0;
Anna Bridge 186:707f6e361f3e 283 wdt->ctrl &= ~(MXC_F_WDT_CTRL_EN_TIMER);
Anna Bridge 186:707f6e361f3e 284
Anna Bridge 186:707f6e361f3e 285 //lock ctrl to read-only
Anna Bridge 186:707f6e361f3e 286 wdt->lock_ctrl = MXC_V_WDT_LOCK_KEY;
Anna Bridge 186:707f6e361f3e 287
Anna Bridge 186:707f6e361f3e 288 return E_NO_ERROR;
Anna Bridge 186:707f6e361f3e 289 }
Anna Bridge 186:707f6e361f3e 290 /**@} end of ingroup wdt */