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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
70 /*****************************************************************************
71 * Private types/enumerations/variables
72 ****************************************************************************/
73
74 /* Comment this define to let the watchdog timeout. In this case, the board
75 will continuously drop via to the WDT warning. */
76 #define DISABLE_WDT_TIMEOUT
77
78 /*****************************************************************************
79 * Public types/enumerations/variables
80 ****************************************************************************/
81
82 /*****************************************************************************
83 * Private functions
84 ****************************************************************************/
85
86 /*****************************************************************************
87 * Public functions
88 ****************************************************************************/
89
95 void WDT_IRQHandler(void)
96 {
97 uint32_t wdtStatus = Chip_WWDT_GetStatus(LPC_WWDT);
98
99 #if defined(CHIP_LPC11CXX)
100 if (wdtStatus & WWDT_WDMOD_WDTOF) {
101 Board_LED_Toggle(0);
102 while(Chip_WWDT_GetStatus(LPC_WWDT) & WWDT_WDMOD_WDTOF) {
103 Chip_WWDT_ClearStatusFlag(LPC_WWDT, WWDT_WDMOD_WDTOF);
104 }
105 Chip_WWDT_Start(LPC_WWDT); /* Needs restart */
106 }
107 #else
108 Board_LED_Toggle(0);
109
110 /* The chip will reset before this happens, but if the WDT doesn't
111 have WWDT_WDMOD_WDRESET enabled, this will hit once */
112 if (wdtStatus & WWDT_WDMOD_WDTOF) {
113 /* A watchdog feed didn't occur prior to window timeout */
114 Chip_WWDT_ClearStatusFlag(LPC_WWDT, WWDT_WDMOD_WDTOF);
115 Chip_WWDT_Start(LPC_WWDT); /* Needs restart */
116 }
117
118 /* Handle warning interrupt */
119 if (wdtStatus & WWDT_WDMOD_WDINT) {
120 /* A watchdog feed didn't occur prior to warning timeout */
121 Chip_WWDT_ClearStatusFlag(LPC_WWDT, WWDT_WDMOD_WDINT);
122 Chip_WWDT_Feed(LPC_WWDT);
123 }
124 #endif
125 }
126
132 void SysTick_Handler(void)
133 {
134 #if !defined(DISABLE_WDT_TIMEOUT)
135 Chip_WWDT_Feed(LPC_WWDT);
136 #endif
137 }
138
143 int main(void)
144 {
145 uint32_t wdtFreq;
146
147 /* Board Setup */
148 Board_Init();
149
150 /* Initialize WWDT (also enables WWDT clock) */
151 Chip_WWDT_Init(LPC_WWDT);
152
153 /* Prior to initializing the watchdog driver, the clocking for the
154 watchdog must be enabled. This example uses the watchdog oscillator
155 set at a 50KHz (1Mhz / 20) clock rate. */
156 Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_WDTOSC_PD);
157 Chip_Clock_SetWDTOSC(WDTLFO_OSC_1_05, 20);
158
159 /* The WDT divides the input frequency into it by 4 */
160 wdtFreq = Chip_Clock_GetWDTOSCRate() / 4;
161
162 /* LPC1102/4, LPC11XXLV, and LPC11CXX devices select the watchdog
163 clock source from the SYSCLK block, while LPC11AXX, LPC11EXX, and
164 LPC11UXX devices select the clock as part of the watchdog block. */
165 /* Select watchdog oscillator for WDT clock source */
166 #if defined(CHIP_LPC110X) || defined(CHIP_LPC11XXLV) || defined(CHIP_LPC11CXX) || defined(CHIP_LPC11EXX)
167 Chip_Clock_SetWDTClockSource(SYSCTL_WDTCLKSRC_WDTOSC, 1);
168 #else
169 Chip_WWDT_SelClockSource(LPC_WWDT, WWDT_CLKSRC_WATCHDOG_WDOSC);
170 #endif
171
172 Board_LED_Set(0, false);
173
174 /* Set watchdog feed time constant to approximately 2s
175 Set watchdog warning time to 512 ticks after feed time constant
176 Set watchdog window time to 3s */
177 Chip_WWDT_SetTimeOut(LPC_WWDT, wdtFreq * 2);
178 #if !defined(CHIP_LPC11CXX)
179 Chip_WWDT_SetWarning(LPC_WWDT, 512);
180 Chip_WWDT_SetWindow(LPC_WWDT, wdtFreq * 3);
181 #endif
182
183 #if !defined(CHIP_LPC11CXX)
184 /* Configure WWDT to reset on timeout */
185 Chip_WWDT_SetOption(LPC_WWDT, WWDT_WDMOD_WDRESET);
186 #endif
187
188 /* Setup Systick to feed the watchdog timer. This needs to be done
189 * at a rate faster than the WDT warning. */
190 SysTick_Config(Chip_Clock_GetSystemClockRate() / 50);
191
192 /* Clear watchdog warning and timeout interrupts */
193 #if !defined(CHIP_LPC11CXX)
194 Chip_WWDT_ClearStatusFlag(LPC_WWDT, WWDT_WDMOD_WDTOF | WWDT_WDMOD_WDINT);
195 #else
196 Chip_WWDT_ClearStatusFlag(LPC_WWDT, WWDT_WDMOD_WDTOF);
197 #endif
198
199 /* Clear and enable watchdog interrupt */
200 NVIC_ClearPendingIRQ(WDT_IRQn);
201 NVIC_EnableIRQ(WDT_IRQn);
202
203 /* Start watchdog */
204 Chip_WWDT_Start(LPC_WWDT);
205
206 /* Idle while waiting */
207 while (1) {
208 __WFI();
209 }
210 }
211