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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
60 /*****************************************************************************
61 * Private types/enumerations/variables
62 ****************************************************************************/
63
64 static volatile uint32_t ticks100;
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 ticks100++;
85 if ((ticks100 % 100) == 0) {
86 Board_LED_Toggle(0);
87 }
88 }
89
94 int main(void)
95 {
96 CHIP_SYSCTL_CLKOUTSRC_T clkoutClks;
97
98 Board_Init();
99
100 /* Enable and setup SysTick Timer at a 100Hz rate */
101 SysTick_Config(SystemCoreClock / 100);
102
103 /* Enable the power to the WDT */
104 Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_WDTOSC_PD);
105
106 /*This example uses the watchdog oscillator set at a 50KHz (1Mhz / 20) clock rate. */
107 Chip_Clock_SetWDTOSC(WDTLFO_OSC_1_05, 20);
108
109 #if defined(CHIP_LPC11UXX) || defined(CHIP_LPC11EXX) || defined(CHIP_LPC11AXX)
110 /* LPC11U14 Xpresso board has CLKOUT on pin PIO0_1 on J6-38 */
111 Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 1, (IOCON_FUNC1 | IOCON_MODE_INACT));
112 #else
113 /* LPC11C24 Xpresso board has CLKOUT on pin PIO0_1 on J6-38 */
114 Chip_IOCON_PinMuxSet(LPC_IOCON, IOCON_PIO0_1, (IOCON_FUNC1 | IOCON_MODE_INACT));
115 #endif
116
117 /* Cycle through all clock sources for the CLKOUT pin */
118 for (clkoutClks = SYSCTL_CLKOUTSRC_IRC;
119 clkoutClks <= SYSCTL_CLKOUTSRC_MAINSYSCLK; clkoutClks++) {
120 ticks100 = 0;
121
122 /* Setup CLKOUT pin for specific clock with a divider of 1 */
123 Chip_Clock_SetCLKOUTSource(clkoutClks, 1);
124
125 /* Wait 5 seconds */
126 while (ticks100 < 500) {
127 __WFI();
128 }
129 }
130
131 /* Disable CLKOUT pin by setting divider to 0 */
132 Chip_Clock_SetCLKOUTSource(SYSCTL_CLKOUTSRC_IRC, 0);
133
134 return 0;
135 }
136