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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
60 /*****************************************************************************
61 * Private types/enumerations/variables
62 ****************************************************************************/
63
64 #define TICKRATE_HZ1 (10) /* 10 ticks per second */
65 #define TICKRATE_HZ2 (11) /* 11 ticks per second */
66
67 /*****************************************************************************
68 * Public types/enumerations/variables
69 ****************************************************************************/
70
71 /*****************************************************************************
72 * Private functions
73 ****************************************************************************/
74
75 /*****************************************************************************
76 * Public functions
77 ****************************************************************************/
78
83 void SysTick_Handler(void)
84 {
85 Board_LED_Set(0, false);
86 }
87
92 void TIMER32_0_IRQHandler(void)
93 {
94 if (Chip_TIMER_MatchPending(LPC_TIMER32_0, 1)) {
95 Chip_TIMER_ClearMatch(LPC_TIMER32_0, 1);
96 Board_LED_Set(0, true);
97 }
98 }
99
104 int main(void)
105 {
106 uint32_t timerFreq;
107
108 Board_Init();
109
110 /* Enable and setup SysTick Timer at a periodic rate */
111 SysTick_Config(SystemCoreClock / TICKRATE_HZ1);
112
113 /* Enable timer 1 clock */
114 Chip_TIMER_Init(LPC_TIMER32_0);
115
116 /* Timer rate is system clock rate */
117 timerFreq = Chip_Clock_GetSystemClockRate();
118
119 /* Timer setup for match and interrupt at TICKRATE_HZ */
120 Chip_TIMER_Reset(LPC_TIMER32_0);
121 Chip_TIMER_MatchEnableInt(LPC_TIMER32_0, 1);
122 Chip_TIMER_SetMatch(LPC_TIMER32_0, 1, (timerFreq / TICKRATE_HZ2));
123 Chip_TIMER_ResetOnMatchEnable(LPC_TIMER32_0, 1);
124 Chip_TIMER_Enable(LPC_TIMER32_0);
125
126 /* Enable timer interrupt */
127 NVIC_ClearPendingIRQ(TIMER_32_0_IRQn);
128 NVIC_EnableIRQ(TIMER_32_0_IRQn);
129
130 /* LEDs toggle in interrupt handlers */
131 while (1) {
132 __WFI();
133 }
134
135 return 0;
136 }
137