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blinky.c
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1 /*
2 * @brief Blinky example using a timer and interrupt
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
63 /*****************************************************************************
64 * Private types/enumerations/variables
65 ****************************************************************************/
66
67 #define TICKRATE_HZ 10
68
69 /*****************************************************************************
70 * Public types/enumerations/variables
71 ****************************************************************************/
72
73 /*****************************************************************************
74 * Private functions
75 ****************************************************************************/
76
77 /*****************************************************************************
78 * Public functions
79 ****************************************************************************/
80
85 void TIMER1_IRQHandler(void)
86 {
87 static bool On = false;
88
89 if (Chip_TIMER_MatchPending(LPC_TIMER1, 1)) {
90 Chip_TIMER_ClearMatch(LPC_TIMER1, 1);
91 On = (bool) !On;
92 Board_LED_Set(0, On);
93 }
94 }
95
100 int main(void)
101 {
102 uint32_t timerFreq;
103
104 Board_Init();
105
106 /* Enable timer 1 clock and reset it */
107 Chip_TIMER_Init(LPC_TIMER1);
108 Chip_RGU_TriggerReset(RGU_TIMER1_RST);
109 while (Chip_RGU_InReset(RGU_TIMER1_RST)) {}
110
111 /* Get timer 1 peripheral clock rate */
112 timerFreq = Chip_Clock_GetRate(CLK_MX_TIMER1);
113
114 /* Timer setup for match and interrupt at TICKRATE_HZ */
115 Chip_TIMER_Reset(LPC_TIMER1);
116 Chip_TIMER_MatchEnableInt(LPC_TIMER1, 1);
117 Chip_TIMER_SetMatch(LPC_TIMER1, 1, (timerFreq / TICKRATE_HZ));
118 Chip_TIMER_ResetOnMatchEnable(LPC_TIMER1, 1);
119 Chip_TIMER_Enable(LPC_TIMER1);
120
121 /* Enable timer interrupt */
122 NVIC_EnableIRQ(TIMER1_IRQn);
123 NVIC_ClearPendingIRQ(TIMER1_IRQn);
124
125 DEBUGSTR("Blinky example using timer 1!\r\n");
126 DEBUGOUT("Timer 1 clock = %d Hz\r\n", timerFreq);
127 DEBUGOUT("Timer 1 tick rate = %d Hz\r\n", TICKRATE_HZ);
128
129 while (1) {
130 __WFI();
131 }
132 }
133