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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 
55 /*****************************************************************************
56  * Private types/enumerations/variables
57  ****************************************************************************/
58 
59 #define TICKRATE_HZ 10
60 
61 /*****************************************************************************
62  * Public types/enumerations/variables
63  ****************************************************************************/
64 
65 /*****************************************************************************
66  * Private functions
67  ****************************************************************************/
68 
69 /*****************************************************************************
70  * Public functions
71  ****************************************************************************/
72 
78 {
79  static bool On = false;
80 
83  On = (bool) !On;
84  Board_LED_Set(0, On);
85  }
86 }
87 
92 int main(void)
93 {
94  uint32_t timerFreq;
95 
96  Board_Init();
98 
99  /* Enable timer 1 clock and reset it */
100  Chip_Clock_EnableOpts(CLK_MX_TIMER1, true, true, 1);
102  while (Chip_RGU_InReset(RGU_TIMER1_RST)) {}
103 
104  /* Get timer 1 peripheral clock rate */
105  timerFreq = Chip_Clock_GetRate(CLK_MX_TIMER1);
106 
107  /* Timer setup for match and interrupt at TICKRATE_HZ */
110  Chip_TIMER_SetMatch(LPC_TIMER1, 1, (timerFreq / TICKRATE_HZ));
113 
114  /* Enable timer interrupt */
115  NVIC_EnableIRQ(TIMER1_IRQn);
116  NVIC_ClearPendingIRQ(TIMER1_IRQn);
117 
118  DEBUGSTR("Blinky example using timer 1!\r\n");
119  DEBUGOUT("Timer 1 clock = %d Hz\r\n", timerFreq);
120  DEBUGOUT("Timer 1 tick rate = %d Hz\r\n", TICKRATE_HZ);
121 
122  while (1) {
123  __WFI();
124  }
125 }
126