LPCOpen Platform  v1.03
LPCOpen Platform for NXP LPC Microcontrollers
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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