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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