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atimer.c
Go to the documentation of this file.
1 /*
2 * @brief ATIMER 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
64 /*****************************************************************************
65 * Private types/enumerations/variables
66 ****************************************************************************/
67
68 #define PresetCount (CRYSTAL_32K_FREQ_IN / 32)
69
70 /*****************************************************************************
71 * Public types/enumerations/variables
72 ****************************************************************************/
73
74 /*****************************************************************************
75 * Private functions
76 ****************************************************************************/
77
78 /* Clearn interrupts */
79 static void ATIMER_ClearInts(void)
80 {
81 /* Clear Alarm Timer interrupt status */
82 Chip_ATIMER_ClearIntStatus(LPC_ATIMER);
83
84 /* Clear Alarm Timer interrupt flag */
85 Chip_EVRT_ClrPendIntSrc(EVRT_SRC_ATIMER);
86 }
87
88 /*****************************************************************************
89 * Public functions
90 ****************************************************************************/
91
96 void EVRT_IRQHandler(void)
97 {
98 /* Check if source interrupt is ATIMER */
99 if (Chip_EVRT_IsSourceInterrupting(EVRT_SRC_ATIMER)) {
100 ATIMER_ClearInts();
101 }
102 }
103
108 int main(void)
109 {
110 bool On = false;
111
112 Board_Init();
113
114 /* Init Alarm Timer with Preset Count for about 1s */
115 Chip_ATIMER_Init(LPC_ATIMER, PresetCount);
116
117 /* Init EVRT */
118 Chip_EVRT_Init();
119
120 /* Enable EVRT in order to be able to read the ATIMER interrupt */
121 Chip_EVRT_ConfigIntSrcActiveType(EVRT_SRC_ATIMER, EVRT_SRC_ACTIVE_HIGH_LEVEL);
122
123 /* Enable Alarm Timer Source */
124 Chip_EVRT_SetUpIntSrc(EVRT_SRC_ATIMER, ENABLE);
125
126 /* Enable NVIC */
127 NVIC_EnableIRQ(EVENTROUTER_IRQn);
128
129 /* Clear the interrupt states */
130 ATIMER_ClearInts();
131
132 /* Enable Alarm Timer */
133 Chip_ATIMER_IntEnable(LPC_ATIMER);
134
135 while (1) {
136 /* Sleep until ATIMER fires */
137 __WFI();
138 On = (bool) !On;
139 Board_LED_Set(1, On);
140 }
141 }
142