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 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