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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
60 /*****************************************************************************
61 * Private types/enumerations/variables
62 ****************************************************************************/
63
64 #define TICKRATE1_HZ 10
65 #define TICKRATE2_HZ 7
66
67 /*****************************************************************************
68 * Public types/enumerations/variables
69 ****************************************************************************/
70
71 /*****************************************************************************
72 * Private functions
73 ****************************************************************************/
74
75 /*****************************************************************************
76 * Public functions
77 ****************************************************************************/
78
83 void TIMER1_IRQHandler(void)
84 {
85 static bool On = false;
86
87 if (Chip_TIMER_MatchPending(LPC_TIMER1, 1)) {
88 Chip_TIMER_ClearMatch(LPC_TIMER1, 1);
89 On = (bool) !On;
90 Board_LED_Set(0, On);
91 }
92 }
93
98 void TIMER2_IRQHandler(void)
99 {
100 static bool On = false;
101
102 if (Chip_TIMER_MatchPending(LPC_TIMER2, 1)) {
103 Chip_TIMER_ClearMatch(LPC_TIMER2, 1);
104 On = (bool) !On;
105 Board_LED_Set(1, On);
106 }
107 }
108
113 int main(void)
114 {
115 uint32_t timerFreq;
116
117 Board_Init();
118
119 DEBUGSTR("Blinky example using timers 1 and 2!\r\n");
120
121 /* Enable timer 1 clock and get clock rate */
122 Chip_TIMER_Init(LPC_TIMER1);
123 #if defined(CHIP_LPC175X_6X)
124 timerFreq = Chip_Clock_GetPeripheralClockRate(SYSCTL_PCLK_TIMER1);
125 #else
126 timerFreq = Chip_Clock_GetPeripheralClockRate();
127 #endif
128
129 Chip_TIMER_Reset(LPC_TIMER1);
130 Chip_TIMER_MatchEnableInt(LPC_TIMER1, 1);
131 Chip_TIMER_SetMatch(LPC_TIMER1, 1, (timerFreq / TICKRATE1_HZ));
132 Chip_TIMER_ResetOnMatchEnable(LPC_TIMER1, 1);
133 Chip_TIMER_Enable(LPC_TIMER1);
134
135 /* Enable timer interrupt */
136 NVIC_EnableIRQ(TIMER1_IRQn);
137 NVIC_ClearPendingIRQ(TIMER1_IRQn);
138
139 DEBUGOUT("Timer 1 clock = %d Hz\r\n", timerFreq);
140 DEBUGOUT("Timer 1 tick rate = %d Hz\r\n", TICKRATE1_HZ);
141
142 /* Enable timer 2 clock and get clock rate */
143 Chip_TIMER_Init(LPC_TIMER2);
144 #if defined(CHIP_LPC175X_6X)
145 timerFreq = Chip_Clock_GetPeripheralClockRate(SYSCTL_PCLK_TIMER2);
146 #else
147 timerFreq = Chip_Clock_GetPeripheralClockRate();
148 #endif
149
150 Chip_TIMER_Reset(LPC_TIMER2);
151 Chip_TIMER_MatchEnableInt(LPC_TIMER2, 1);
152 Chip_TIMER_SetMatch(LPC_TIMER2, 1, (timerFreq / TICKRATE2_HZ));
153 Chip_TIMER_ResetOnMatchEnable(LPC_TIMER2, 1);
154 Chip_TIMER_Enable(LPC_TIMER2);
155
156 /* Enable timer interrupt */
157 NVIC_EnableIRQ(TIMER2_IRQn);
158 NVIC_ClearPendingIRQ(TIMER2_IRQn);
159
160 DEBUGOUT("Timer 2 clock = %d Hz\r\n", timerFreq);
161 DEBUGOUT("Timer 2 tick rate = %d Hz\r\n", TICKRATE2_HZ);
162
163 while (1) {
164 __WFI();
165 }
166 }
167