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acmp.c
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1 /*
2 * @brief Analog Comparator 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
63 /*****************************************************************************
64 * Private types/enumerations/variables
65 ****************************************************************************/
66
67 /*****************************************************************************
68 * Public types/enumerations/variables
69 ****************************************************************************/
70
71 /*****************************************************************************
72 * Private functions
73 ****************************************************************************/
74
75 /*****************************************************************************
76 * Public functions
77 ****************************************************************************/
78
83 void CMP_IRQHandler(void)
84 {
85 /* Clear the interrupt */
86 Chip_ACMP_EdgeClear(LPC_CMP);
87
88 __SEV();
89 }
90
95 void HW_Setup(void)
96 {
97 /* initialize the board */
98 Board_Init();
99
100 /* initialize the ACMP */
101 Chip_ACMP_Init(LPC_CMP);
102
103 /* Enable the clock to the Switch Matrix */
104 Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_SWM);
105
106 /* Configure the SWM for ACMP_I1 as the input for the Analog Comparator. */
107 Chip_SWM_FixedPinEnable(ACMP_I1, ENABLE);
108
109 /* Set the LPC8XX_ACMP_O_PINx (in sys_config.h) pin direction as an output. */
110 Chip_GPIO_SetDir(LPC_GPIO_PORT, 0, LPC8XX_ACMP_O_PINx, 1);
111
112 /* Configure the SWM for PIO15 as the output for the comparator. */
113 Chip_SWM_MovablePinAssign(SWM_ACMP_O_O, PIO15);
114
115 /* Positive and negative references, both edges, no hysteresis */
116 Chip_ACMP_SetupAMCPRefs(LPC_CMP, ACMP_EDGESEL_BOTH, ACMP_POSIN_ACMP_I1, ACMP_NEGIN_INT_REF, ACMP_HYS_NONE);
117
118 /* Disable the clock to the Switch Matrix to save power */
119 Chip_Clock_DisablePeriphClock(SYSCTL_CLOCK_SWM);
120
121 /* Enable the Interrupt for the compare output */
122 NVIC_EnableIRQ(CMP_IRQn);
123 }
124
129 int main(void)
130 {
131 /* Board and hardware setup */
132 HW_Setup();
133
134 while (1) {
135 /* Enter low power mode until interrupt */
136 __WFE();
137
138 if (Chip_ACMP_GetCompStatus(LPC_CMP) & ACMP_COMPSTAT_BIT) {
139 Board_LED_Set(0, false);
140 }
141 else {
142 Board_LED_Set(0, true);
143 }
144 }
145
146 return 0;
147 }
148