LPCOpen Platform  v1.03
LPCOpen Platform for NXP LPC Microcontrollers
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bod.c
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1 /*
2  * @brief Brown-out detector 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 #include <stdio.h>
34 
65 /*****************************************************************************
66  * Private types/enumerations/variables
67  ****************************************************************************/
68 
69 static volatile uint8_t isPORReset = 0;
70 
71 /*****************************************************************************
72  * Public types/enumerations/variables
73  ****************************************************************************/
74 
75 /*****************************************************************************
76  * Private functions
77  ****************************************************************************/
78 
79 /*****************************************************************************
80  * Public functions
81  ****************************************************************************/
82 
87 void BOD_IRQHandler(void)
88 {
89  /* Toggle LED on if brown-out detector trips */
90  Board_LED_Set(0, true);
91 
92  /* Disable interrupt so it won't keep firing */
93  NVIC_DisableIRQ(BOD_IRQn);
94 }
95 
100 int main(void)
101 {
102  uint32_t sysResetStatus;
103  volatile int loop = 1;
104 
105  /* Generic Initialization */
106  Board_Init();
107 
108  Board_LED_Set(0, false);
109 
110  /* Set brown-out interrupt level with reset */
111  Chip_SYSCTL_SetBODLevels(SYSCTL_BODRSTLVL_2_06V, SYSCTL_BODINTVAL_2_80V);
112  Chip_SYSCTL_EnableBODReset();
113 
114  /* Enable BOD interrupt */
115  NVIC_ClearPendingIRQ(BOD_IRQn);
116  NVIC_EnableIRQ(BOD_IRQn);
117 
118  /* If the board was reset due to a BOD event, the reset can be
119  detected here. If the board was completely powered off, the BOD
120  reset event won't be active. */
121  sysResetStatus = Chip_SYSCTL_GetSystemRSTStatus();
122  if ((sysResetStatus & SYSCTL_RST_BOD) == 0) {
123  /* Board was reset via a normal power-on reset event */
124  sysResetStatus |= SYSCTL_RST_POR;
125  }
126  else {
127  /* Board was reset via a BOD event */
128  sysResetStatus |= SYSCTL_RST_BOD;
129  }
130 
131  /* Clear reset status */
132  Chip_SYSCTL_ClearSystemRSTStatus(sysResetStatus);
133 
134  /* Wait forever */
135  while (loop) {
136  __WFI();
137  }
138 
139  return 0;
140 }
141