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clkout.c
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1 /*
2 * @brief CLKOUT 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 #include <stdio.h>
34
59 /*****************************************************************************
60 * Private types/enumerations/variables
61 ****************************************************************************/
62
63 static volatile uint32_t ticks100;
64
65 /*****************************************************************************
66 * Public types/enumerations/variables
67 ****************************************************************************/
68
69 /*****************************************************************************
70 * Private functions
71 ****************************************************************************/
72
73 /*****************************************************************************
74 * Public functions
75 ****************************************************************************/
76
81 void SysTick_Handler(void)
82 {
83 ticks100++;
84 if ((ticks100 % 100) == 0) {
85 Board_LED_Toggle(0);
86 }
87 }
88
93 int main(void)
94 {
95 CHIP_SYSCTL_CLKOUTSRC_T clkoutClks;
96
97 Board_Init();
98
99 Board_LED_Set(0, false);
100
101 /* Enable and setup SysTick Timer at a 100Hz rate */
102 SysTick_Config(SystemCoreClock / 100);
103
104 /* Enable the power to the WDT */
105 Chip_SYSCTL_PowerUp(SYSCTL_SLPWAKE_WDTOSC_PD);
106
107 /* Enables clock for WDT */
108 Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_WWDT);
109
110 /* Configure PIN0.0 with pull-up */
111 Chip_IOCON_PinSetMode(LPC_IOCON, PIO1, PIN_MODE_PULLUP);
112
113 /* Connect the SWM_CLKOUT_O signal to port pin P0.1 */
114 Chip_SWM_MovablePinAssign(SWM_CLKOUT_O, PIO1);
115
116 /* Cycle through all clock sources for the CLKOUT pin */
117 for (clkoutClks = SYSCTL_CLKOUTSRC_IRC;
118 clkoutClks <= SYSCTL_CLKOUTSRC_MAINSYSCLK; clkoutClks++) {
119 ticks100 = 0;
120
121 /* Setup CLKOUT pin for specific clock with a divider of 1 */
122 Chip_Clock_SetCLKOUTSource(clkoutClks, 1);
123 /* Wait 5 seconds */
124 while (ticks100 < 500) {
125 __WFI();
126 }
127 }
128
129 /* Disable CLKOUT pin by setting divider to 0 */
130 Chip_Clock_SetCLKOUTSource(SYSCTL_CLKOUTSRC_MAINSYSCLK, 0);
131
132 return 0;
133 }
134