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blinky.c
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1 /*
2 * @brief Blinky example using timers and sysTick
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
59 /*****************************************************************************
60 * Private types/enumerations/variables
61 ****************************************************************************/
62
63 #define TICKRATE_HZ1 (10) /* 10 ticks per second */
64 #define TICKRATE_HZ2 (11) /* 11 ticks per second */
65
66 /*****************************************************************************
67 * Public types/enumerations/variables
68 ****************************************************************************/
69
70 /*****************************************************************************
71 * Private functions
72 ****************************************************************************/
73
74 /*****************************************************************************
75 * Public functions
76 ****************************************************************************/
77
82 void SysTick_Handler(void)
83 {
84 Board_LED_Set(0, false);
85 }
86
91 void TIMER32_0_IRQHandler(void)
92 {
93 if (Chip_TIMER_MatchPending(LPC_TIMER32_0, 1)) {
94 Chip_TIMER_ClearMatch(LPC_TIMER32_0, 1);
95 Board_LED_Set(0, true);
96 }
97 }
98
103 int main(void)
104 {
105 uint32_t timerFreq;
106
107 Board_Init();
108
109 /* Enable and setup SysTick Timer at a periodic rate */
110 SysTick_Config(SystemCoreClock / TICKRATE_HZ1);
111
112 /* Enable timer 1 clock */
113 Chip_TIMER_Init(LPC_TIMER32_0);
114
115 /* Timer rate is system clock rate */
116 timerFreq = Chip_Clock_GetSystemClockRate();
117
118 /* Timer setup for match and interrupt at TICKRATE_HZ */
119 Chip_TIMER_Reset(LPC_TIMER32_0);
120 Chip_TIMER_MatchEnableInt(LPC_TIMER32_0, 1);
121 Chip_TIMER_SetMatch(LPC_TIMER32_0, 1, (timerFreq / TICKRATE_HZ2));
122 Chip_TIMER_ResetOnMatchEnable(LPC_TIMER32_0, 1);
123 Chip_TIMER_Enable(LPC_TIMER32_0);
124
125 /* Enable timer interrupt */
126 NVIC_ClearPendingIRQ(TIMER_32_0_IRQn);
127 NVIC_EnableIRQ(TIMER_32_0_IRQn);
128
129 /* LEDs toggle in interrupt handlers */
130 while (1) {
131 __WFI();
132 }
133
134 return 0;
135 }
136