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watchdog.c
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1 /*
2 * @brief WWDT example
3 *
4 * @note
5 * Copyright(C) NXP Semiconductors, 2012
6 * All rights reserved.
7 *
8 * @par
9 * Software that is described herein is for illustrative purposes only
10 * which provides customers with programming information regarding the
11 * LPC products. This software is supplied "AS IS" without any warranties of
12 * any kind, and NXP Semiconductors and its licensor disclaim any and
13 * all warranties, express or implied, including all implied warranties of
14 * merchantability, fitness for a particular purpose and non-infringement of
15 * intellectual property rights. NXP Semiconductors assumes no responsibility
16 * or liability for the use of the software, conveys no license or rights under any
17 * patent, copyright, mask work right, or any other intellectual property rights in
18 * or to any products. NXP Semiconductors reserves the right to make changes
19 * in the software without notification. NXP Semiconductors also makes no
20 * representation or warranty that such application will be suitable for the
21 * specified use without further testing or modification.
22 *
23 * @par
24 * Permission to use, copy, modify, and distribute this software and its
25 * documentation is hereby granted, under NXP Semiconductors' and its
26 * licensor's relevant copyrights in the software, without fee, provided that it
27 * is used in conjunction with NXP Semiconductors microcontrollers. This
28 * copyright, permission, and disclaimer notice must appear in all copies of
29 * this code.
30 */
31
32 #include "board.h"
33
75 /*****************************************************************************
76 * Private types/enumerations/variables
77 ****************************************************************************/
78
79 static volatile int wdtFeedState;
80 static volatile bool On = false, On1 = false;
81
82 /*****************************************************************************
83 * Public types/enumerations/variables
84 ****************************************************************************/
85
86 /*****************************************************************************
87 * Private functions
88 ****************************************************************************/
89
90 /* WDT interrupt handler */
91 static void wdt_handle(void) {
92 uint32_t wdtStatus = Chip_WWDT_GetStatus(LPC_WWDT);
93
94 On = (bool) !On;
95
96 /* The chip will reset before this happens, but if the WDT doesn't
97 have WWDT_WDMOD_WDRESET enabled, this will hit once */
98 if (wdtStatus & WWDT_WDMOD_WDTOF) {
99 /* A watchdog feed didn't occur prior to window timeout */
100 Chip_WWDT_ClearStatusFlag(LPC_WWDT, WWDT_WDMOD_WDTOF);
101
102 if (wdtFeedState == 2) {
103 Chip_WWDT_Start(LPC_WWDT); /* Needs restart */
104 }
105 }
106
107 /* Handle warning interrupt */
108 if (wdtStatus & WWDT_WDMOD_WDINT) {
109 /* A watchdog feed didn't occur prior to warning timeout */
110 Chip_WWDT_ClearStatusFlag(LPC_WWDT, WWDT_WDMOD_WDINT);
111
112 if (wdtFeedState == 1) {
113 Chip_WWDT_Feed(LPC_WWDT);
114 }
115 }
116 }
117
118 /*****************************************************************************
119 * Public functions
120 ****************************************************************************/
121
127 void EVRT_IRQHandler(void)
128 {
129 On1 = !On1;
130
131 /* Clear watchdog timer interrupt in event router (ok to clear before
132 watchdog clear on edge based event router events) */
133 Chip_EVRT_ClrPendIntSrc(EVRT_SRC_WWDT);
134
135 wdt_handle();
136 }
137
143 void WDT_IRQHandler(void)
144 {
145 wdt_handle();
146 }
147
153 void SysTick_Handler(void)
154 {
155 if (wdtFeedState == 0) {
156 On = (bool) !On;
157 Chip_WWDT_Feed(LPC_WWDT);
158 }
159 }
160
165 int main(void)
166 {
167 uint8_t ch;
168
169 Board_Init();
170
171 /* Watchdog will be fed on each watchdog interrupt */
172 wdtFeedState = 0;
173
174 /* Initialize WWDT and event router */
175 Chip_WWDT_Init(LPC_WWDT);
176 Chip_EVRT_Init();
177
178 /* Set watchdog feed time constant to 0.1s
179 Set watchdog warning time to 512 ticks after feed time constant
180 Set watchdog window time to 0.9s */
181 Chip_WWDT_SetTimeOut(LPC_WWDT, WDT_OSC / 10);
182 Chip_WWDT_SetWarning(LPC_WWDT, 512);
183 Chip_WWDT_SetWindow(LPC_WWDT, WDT_OSC - (WDT_OSC / 10));
184
185 /* Configure WWDT to reset on timeout */
186 Chip_WWDT_SetOption(LPC_WWDT, WWDT_WDMOD_WDRESET);
187
188 /* Clear watchdog warning and timeout interrupts */
189 Chip_WWDT_ClearStatusFlag(LPC_WWDT, WWDT_WDMOD_WDTOF | WWDT_WDMOD_WDINT);
190
191 /* Initiate EVRT, route interrupt signal from WWDT to EVRT,
192 enable EVRT WWDT interrupt */
193 Chip_EVRT_ConfigIntSrcActiveType(EVRT_SRC_WWDT, EVRT_SRC_ACTIVE_RISING_EDGE);
194 Chip_EVRT_SetUpIntSrc(EVRT_SRC_WWDT, ENABLE);
195
196 /* Start watchdog */
197 Chip_WWDT_Start(LPC_WWDT);
198
199 /* Setup Systick for a 10Hz tick rate. Systick clock is clocked at
200 CPU core clock speed */
201 SysTick_Config(Chip_Clock_GetRate(CLK_MX_MXCORE) / 20);
202
203 /* Enable watchdog interrupt */
204 NVIC_EnableIRQ(WWDT_IRQn);
205
206 /* Watchdog test options */
207 DEBUGOUT("Press '1' to enable watchdog feed on systick interrupt\n\r");
208 DEBUGOUT("Press '2' to enable watchdog feed on warning interrupt\n\r");
209 DEBUGOUT("Press '3' to disable watchdog feed (will reset device)\n\r");
210 DEBUGOUT("Press '4' to switch from WDT interrupt to event router handler\n\r");
211
212 while (1) {
213 do {
214 ch = DEBUGIN();
215 Board_LED_Set(0, On);
216 Board_LED_Set(1, On1);
217 } while ((ch < '1') || (ch > '4'));
218
219 switch (ch) {
220 case '1':
221 default:
222 wdtFeedState = 0;
223 DEBUGOUT("Watchdog feed on systick interrupt\r\n");
224 break;
225
226 case '2':
227 wdtFeedState = 1;
228 DEBUGOUT("Watchdog feed on warning interrupt\r\n");
229 break;
230
231 case '3':
232 wdtFeedState = 2;
233 DEBUGOUT("No feeding - board will reset\r\n");
234 break;
235
236 case '4':
237 DEBUGOUT("using event router instead of WDT interrupt\r\n");
238 NVIC_DisableIRQ(WWDT_IRQn);
239 NVIC_EnableIRQ(EVENTROUTER_IRQn);
240 break;
241 }
242 }
243 }
244