LPCOpen Platform  v1.03
LPCOpen Platform for NXP LPC Microcontrollers
 All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
bod.c
Go to the documentation of this file.
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 /*****************************************************************************
69  * Public types/enumerations/variables
70  ****************************************************************************/
71 
72 /*****************************************************************************
73  * Private functions
74  ****************************************************************************/
75 
76 void BOD_IRQHandler(void)
77 {
78  /* Toggle LED on if brown-out detector trips */
79  Board_LED_Set(0, true);
80 
81  /* Disable interrupt so it won't keep firing */
82  NVIC_DisableIRQ(BOD_IRQn);
83 }
84 
85 /*****************************************************************************
86  * Public functions
87  ****************************************************************************/
88 
93 int main(void)
94 {
95  uint32_t sysResetStatus;
96 
97  /* Generic Initialization */
98  Board_Init();
99 
100  Board_LED_Set(0, false);
101 
102  /* Set brown-out interrupt level with reset */
103  Chip_SYSCTL_SetBODLevels(SYSCTL_BODRSTLVL_2, SYSCTL_BODINTVAL_LVL3);
104  Chip_SYSCTL_EnableBODReset();
105 
106  /* Enable BOD interrupt */
107  NVIC_ClearPendingIRQ(BOD_IRQn);
108  NVIC_EnableIRQ(BOD_IRQn);
109 
110  /* If the board was reset due to a BOD event, the reset can be
111  detected here. If the board was completely powered off, the BOD
112  reset event won't be active. */
113  sysResetStatus = Chip_SYSCTL_GetSystemRSTStatus();
114  if ((sysResetStatus & SYSCTL_RST_BOD) == 0) {
115  /* Board was reset via a normal power-on reset event */
116  sysResetStatus |= SYSCTL_RST_POR;
117  } else {
118  /* Board was reset via a BOD eventt */
119  sysResetStatus |= SYSCTL_RST_BOD;
120  }
121 
122  /* Clear reset status */
123  Chip_SYSCTL_ClearSystemRSTStatus(sysResetStatus);
124 
125  /* Wait forever */
126  while (1) {
127  __WFI();
128  }
129 
130  return 0;
131 }
132