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 
64 /*****************************************************************************
65  * Private types/enumerations/variables
66  ****************************************************************************/
67 
68 static volatile uint8_t isPORReset = 0;
69 
70 /*****************************************************************************
71  * Public types/enumerations/variables
72  ****************************************************************************/
73 
74 /*****************************************************************************
75  * Private functions
76  ****************************************************************************/
77 
78 /*****************************************************************************
79  * Public functions
80  ****************************************************************************/
81 
86 void BOD_IRQHandler(void)
87 {
88  /* Toggle LED on if brown-out detector trips */
89  Board_LED_Set(0, true);
90 
91  /* Disable interrupt so it won't keep firing */
92  NVIC_DisableIRQ(BOD_IRQn);
93 }
94 
99 int main(void)
100 {
101  uint32_t sysResetStatus;
102  volatile int loop = 1;
103 
104  /* Generic Initialization */
105  Board_Init();
106 
107  Board_LED_Set(0, false);
108 
109  /* Set brown-out interrupt level with reset */
110  Chip_SYSCTL_SetBODLevels(SYSCTL_BODRSTLVL_2_06V, SYSCTL_BODINTVAL_2_80V);
111  Chip_SYSCTL_EnableBODReset();
112 
113  /* Enable BOD interrupt */
114  NVIC_ClearPendingIRQ(BOD_IRQn);
115  NVIC_EnableIRQ(BOD_IRQn);
116 
117  /* If the board was reset due to a BOD event, the reset can be
118  detected here. If the board was completely powered off, the BOD
119  reset event won't be active. */
120  sysResetStatus = Chip_SYSCTL_GetSystemRSTStatus();
121  if ((sysResetStatus & SYSCTL_RST_BOD) == 0) {
122  /* Board was reset via a normal power-on reset event */
123  sysResetStatus |= SYSCTL_RST_POR;
124  }
125  else {
126  /* Board was reset via a BOD event */
127  sysResetStatus |= SYSCTL_RST_BOD;
128  }
129 
130  /* Clear reset status */
131  Chip_SYSCTL_ClearSystemRSTStatus(sysResetStatus);
132 
133  /* Wait forever */
134  while (loop) {
135  __WFI();
136  }
137 
138  return 0;
139 }
140