LPCOpen Platform  v1.03
LPCOpen Platform for NXP LPC Microcontrollers
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acmp_001.c
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1 /*
2  * Copyright(C) NXP Semiconductors, 2012
3  * All rights reserved.
4  *
5  * Software that is described herein is for illustrative purposes only
6  * which provides customers with programming information regarding the
7  * LPC products. This software is supplied "AS IS" without any warranties of
8  * any kind, and NXP Semiconductors and its licensor disclaim any and
9  * all warranties, express or implied, including all implied warranties of
10  * merchantability, fitness for a particular purpose and non-infringement of
11  * intellectual property rights. NXP Semiconductors assumes no responsibility
12  * or liability for the use of the software, conveys no license or rights under any
13  * patent, copyright, mask work right, or any other intellectual property rights in
14  * or to any products. NXP Semiconductors reserves the right to make changes
15  * in the software without notification. NXP Semiconductors also makes no
16  * representation or warranty that such application will be suitable for the
17  * specified use without further testing or modification.
18  *
19  * Permission to use, copy, modify, and distribute this software and its
20  * documentation is hereby granted, under NXP Semiconductors' and its
21  * licensor's relevant copyrights in the software, without fee, provided that it
22  * is used in conjunction with NXP Semiconductors microcontrollers. This
23  * copyright, permission, and disclaimer notice must appear in all copies of
24  * this code.
25  */
26 
27 #include "acmp_001.h"
28 
29 /*****************************************************************************
30  * Private types/enumerations/variables
31  ****************************************************************************/
32 
33 /* EDGECLR interrupt clear bit, write 1, then 0 */
34 #define ACMP_EDGECLR_BIT (1 << 20)
35 
36 #define ACMP_EDGESEL_MASK (0x3 << 3)
37 #define ACMP_COMPVPSEL_MASK (0x7 << 8)
38 #define ACMP_COMPVMSEL_MASK (0x7 << 11)
39 #define ACMP_HYSTERESIS_MASK (0x3 << 25)
40 #define ACMP_LADSEL_MASK (0x1F << 1)
41 #define ACMP_LADREF_MASK (0x1 << 6)
42 
43 /*****************************************************************************
44  * Public types/enumerations/variables
45  ****************************************************************************/
46 
47 /*****************************************************************************
48  * Private functions
49  ****************************************************************************/
50 
51 /*****************************************************************************
52  * Public functions
53  ****************************************************************************/
54 
55 /* Clears the EDGECLR bit */
56 void IP_ACMP_EdgeClear(ACMP_001_T *pACMP)
57 {
58  uint32_t reg = pACMP->CTRL;
59 
60  /* Toggle EDGECLR bit high and then low */
61  pACMP->CTRL = reg | ACMP_EDGECLR_BIT;
62  pACMP->CTRL = reg & ~ACMP_EDGECLR_BIT;
63 }
64 
65 /* Sets up ACMP edge selection */
66 void IP_ACMP_SetEdgeSelection(ACMP_001_T *pACMP, IP_ACMP_001_EDGESEL_T edgeSel)
67 {
68  uint32_t reg = pACMP->CTRL & ~ACMP_EDGESEL_MASK;
69 
70  /* Select edge for COMPEDGE */
71  pACMP->CTRL = reg | (uint32_t) edgeSel;
72 }
73 
74 /* Selects positive voltage input */
75 void IP_ACMP_SetPosVoltRef(ACMP_001_T *pACMP, uint32_t Posinput)
76 {
77  uint32_t reg = pACMP->CTRL & ~ACMP_COMPVPSEL_MASK;
78 
79  /* Select positive input */
80  pACMP->CTRL = reg | Posinput;
81 }
82 
83 /* Selects negative voltage input */
84 void IP_ACMP_SetNegVoltRef(ACMP_001_T *pACMP, uint32_t Neginput)
85 {
86  uint32_t reg = pACMP->CTRL & ~ACMP_COMPVMSEL_MASK;
87 
88  /* Select negative input */
89  pACMP->CTRL = reg | Neginput;
90 }
91 
92 /* Selects hysteresis level */
93 void IP_ACMP_SetHysteresis(ACMP_001_T *pACMP, IP_ACMP_HYS_001_T hys)
94 {
95  uint32_t reg = pACMP->CTRL & ~ACMP_HYSTERESIS_MASK;
96 
97  /* Select negative input */
98  pACMP->CTRL = reg | (uint32_t) hys;
99 }
100 
101 /* Helper function for setting up ACMP control */
102 void IP_ACMP_SetupAMCPRefs(ACMP_001_T *pACMP, IP_ACMP_001_EDGESEL_T edgeSel,
103  uint32_t Posinput, uint32_t Neginput, IP_ACMP_HYS_001_T hys)
104 {
105  uint32_t reg = pACMP->CTRL & ~(ACMP_HYSTERESIS_MASK |
106  ACMP_COMPVMSEL_MASK | ACMP_COMPVPSEL_MASK | ACMP_EDGESEL_MASK);
107 
108  /* Select negative input */
109  pACMP->CTRL = reg | (uint32_t) edgeSel | (uint32_t) Posinput |
110  (uint32_t) Neginput | (uint32_t) hys;
111 }
112 
113 /* Sets up voltage ladder */
114 void IP_ACMP_SetupVoltLadder(ACMP_001_T *pACMP, uint32_t ladsel, bool ladrefVDDCMP)
115 {
116  uint32_t reg = pACMP->LAD & ~(ACMP_LADSEL_MASK | ACMP_LADREF_MASK);
117 
118  /* Setup voltage ladder and ladder reference */
119  if (ladrefVDDCMP) {
120  reg |= ACMP_LADREF_MASK;
121  }
122  pACMP->LAD = reg | ladsel;
123 }