LPCOpen Platform  v1.03
LPCOpen Platform for NXP LPC Microcontrollers
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sct.c
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1 /*
2  * @brief State Configurable Timer (SCT) example
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 
56 /*****************************************************************************
57  * Private types/enumerations/variables
58  ****************************************************************************/
59 
60 #define TICKRATE_HZ (10)/* 10 ticks per second */
61 
62 static volatile uint32_t ticks;
63 
64 /*****************************************************************************
65  * Public types/enumerations/variables
66  ****************************************************************************/
67 
68 /*****************************************************************************
69  * Private functions
70  ****************************************************************************/
71 
72 /*****************************************************************************
73  * Public functions
74  ****************************************************************************/
75 
80 void SysTick_Handler(void)
81 {
82  ++ticks;
83  Board_LED_Toggle(1);
84 }
85 
90 void SCT_IRQHandler(void)
91 {
92  if (ticks % 2) {
93  Board_LED_Toggle(2);
94  }
95  else {
96  Board_LED_Toggle(0);
97  }
98 
99  /* Clear the Interrupt */
100  Chip_SCT_ClearEventFlag(LPC_SCT, SCT_EVT_0);
101 }
102 
107 int main(void)
108 {
109  /* Generic Initialization */
110  Board_Init();
111 
112  /* Enable SysTick Timer */
113  if (SysTick_Config(SystemCoreClock / TICKRATE_HZ)) {
114  while (1) { /* error with configuring SysTick */
115  }
116  }
117 
118  /* Custom Initialization */
119  Chip_SCT_Init(LPC_SCT);
120 
121  /* Configure the SCT as a 32bit counter using the bus clock */
122  Chip_SCT_Config(LPC_SCT, SCT_CONFIG_32BIT_COUNTER | SCT_CONFIG_CLKMODE_BUSCLK);
123 
124  /* The match/capture REGMODE defaults to match mode */
125 
126  /* Set the match count for match register 0 */
127  Chip_SCT_SetMatchCount(LPC_SCT, SCT_MATCH_0, SystemCoreClock / TICKRATE_HZ);
128 
129  /* Set the match reload value */
130  Chip_SCT_SetMatchReload(LPC_SCT, SCT_MATCH_0, SystemCoreClock / TICKRATE_HZ);
131 
132  /* Enable an Interrupt on the Match Event */
133  Chip_SCT_EventIntEnable(LPC_SCT, SCT_EVT_0);
134 
135  /* Enable the IRQ for the SCT */
136  NVIC_EnableIRQ(SCT_IRQn);
137 
138  while (1) {
139  Board_LED_Toggle(0);
140  __WFI();
141  }
142 
143  return 0;
144 }
145