1 /*
2 * @brief LPC15xx Analog comparator driver
3 *
4 * Copyright(C) NXP Semiconductors, 2014
5 * All rights reserved.
6 *
7 * Software that is described herein is for illustrative purposes only
8 * which provides customers with programming information regarding the
9 * LPC products. This software is supplied "AS IS" without any warranties of
10 * any kind, and NXP Semiconductors and its licensor disclaim any and
11 * all warranties, express or implied, including all implied warranties of
12 * merchantability, fitness for a particular purpose and non-infringement of
13 * intellectual property rights. NXP Semiconductors assumes no responsibility
14 * or liability for the use of the software, conveys no license or rights under any
15 * patent, copyright, mask work right, or any other intellectual property rights in
16 * or to any products. NXP Semiconductors reserves the right to make changes
17 * in the software without notification. NXP Semiconductors also makes no
18 * representation or warranty that such application will be suitable for the
19 * specified use without further testing or modification.
20 *
21 * Permission to use, copy, modify, and distribute this software and its
22 * documentation is hereby granted, under NXP Semiconductors' and its
23 * licensor's relevant copyrights in the software, without fee, provided that it
24 * is used in conjunction with NXP Semiconductors microcontrollers. This
25 * copyright, permission, and disclaimer notice must appear in all copies of
26 * this code.
27 */
28
29 #include "chip.h"
30
31 /*****************************************************************************
32 * Private types/enumerations/variables
33 ****************************************************************************/
34
35 /*****************************************************************************
36 * Public types/enumerations/variables
37 ****************************************************************************/
38
39 /*****************************************************************************
40 * Private functions
41 ****************************************************************************/
42
43 /*****************************************************************************
44 * Public functions
45 ****************************************************************************/
46
47 /* Initializes the ACMP */
Chip_ACMP_Init(LPC_CMP_T * pACMP)48 void Chip_ACMP_Init(LPC_CMP_T *pACMP)
49 {
50 Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_ACMP0_PD | SYSCTL_POWERDOWN_ACMP1_PD |
51 SYSCTL_POWERDOWN_ACMP2_PD | SYSCTL_POWERDOWN_ACMP3_PD);
52 Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_ACMP);
53 Chip_SYSCTL_PeriphReset(RESET_ACMP);
54 }
55
56 /* De-initializes the ACMP */
Chip_ACMP_Deinit(LPC_CMP_T * pACMP)57 void Chip_ACMP_Deinit(LPC_CMP_T *pACMP)
58 {
59 Chip_Clock_DisablePeriphClock(SYSCTL_CLOCK_ACMP);
60 Chip_SYSCTL_PowerDown(SYSCTL_POWERDOWN_ACMP0_PD | SYSCTL_POWERDOWN_ACMP1_PD |
61 SYSCTL_POWERDOWN_ACMP2_PD | SYSCTL_POWERDOWN_ACMP3_PD);
62 }
63
64 /*Sets up ACMP edge selection */
Chip_ACMP_SetIntEdgeSelection(LPC_CMP_T * pACMP,uint8_t index,CHIP_ACMP_EDGESEL_T edgeSel)65 void Chip_ACMP_SetIntEdgeSelection(LPC_CMP_T *pACMP, uint8_t index, CHIP_ACMP_EDGESEL_T edgeSel)
66 {
67 /* Make sure interrupt flag is not set during read OR/AND and write operation */
68 uint32_t reg = (pACMP->ACMP[index].CMP & ~ACMP_INTFLAG_BIT) & ~ACMP_INTEDGE_MASK;
69
70 pACMP->ACMP[index].CMP = reg | (uint32_t) edgeSel;
71 }
72
73 /*Selects positive voltage input */
Chip_ACMP_SetPosVoltRef(LPC_CMP_T * pACMP,uint8_t index,CHIP_ACMP_POS_INPUT_T Posinput)74 void Chip_ACMP_SetPosVoltRef(LPC_CMP_T *pACMP, uint8_t index, CHIP_ACMP_POS_INPUT_T Posinput)
75 {
76 /* Make sure interrupt flag is not set during read OR/AND and write operation */
77 uint32_t reg = (pACMP->ACMP[index].CMP & ~ACMP_INTFLAG_BIT) & ~ACMP_COMPVPSEL_MASK;
78
79 /* Select positive input */
80 pACMP->ACMP[index].CMP = reg | (uint32_t) Posinput;
81 }
82
83 /*Selects negative voltage input */
Chip_ACMP_SetNegVoltRef(LPC_CMP_T * pACMP,uint8_t index,CHIP_ACMP_NEG_INPUT_T Neginput)84 void Chip_ACMP_SetNegVoltRef(LPC_CMP_T *pACMP, uint8_t index, CHIP_ACMP_NEG_INPUT_T Neginput)
85 {
86 /* Make sure interrupt flag is not set during read OR/AND and write operation */
87 uint32_t reg = (pACMP->ACMP[index].CMP & ~ACMP_INTFLAG_BIT) & ~ACMP_COMPVMSEL_MASK;
88
89 /* Select negative input */
90 pACMP->ACMP[index].CMP = reg | (uint32_t) Neginput;
91 }
92
93 /*Selects hysteresis level */
Chip_ACMP_SetHysteresis(LPC_CMP_T * pACMP,uint8_t index,CHIP_ACMP_HYS_T hys)94 void Chip_ACMP_SetHysteresis(LPC_CMP_T *pACMP, uint8_t index, CHIP_ACMP_HYS_T hys)
95 {
96 /* Make sure interrupt flag is not set during read OR/AND and write operation */
97 uint32_t reg = (pACMP->ACMP[index].CMP & ~ACMP_INTFLAG_BIT) & ~ACMP_HYSTERESIS_MASK;
98
99 pACMP->ACMP[index].CMP = reg | (uint32_t) hys;
100 }
101
102 /*Helper function for setting up ACMP voltage settings */
Chip_ACMP_SetupACMPRefs(LPC_CMP_T * pACMP,uint8_t index,CHIP_ACMP_POS_INPUT_T Posinput,CHIP_ACMP_NEG_INPUT_T Neginput,CHIP_ACMP_HYS_T hys)103 void Chip_ACMP_SetupACMPRefs(LPC_CMP_T *pACMP, uint8_t index, CHIP_ACMP_POS_INPUT_T Posinput,
104 CHIP_ACMP_NEG_INPUT_T Neginput, CHIP_ACMP_HYS_T hys)
105 {
106 /* Make sure interrupt flag is not set during read OR/AND and write operation */
107 uint32_t reg = (pACMP->ACMP[index].CMP & ~ACMP_INTFLAG_BIT) & ~(ACMP_HYSTERESIS_MASK |
108 ACMP_COMPVMSEL_MASK | ACMP_COMPVPSEL_MASK);
109
110 pACMP->ACMP[index].CMP = reg | (uint32_t) Posinput | (uint32_t) Neginput | (uint32_t) hys;
111 }
112
113 /*Helper function for setting up ACMP interrupt settings */
Chip_ACMP_SetupACMPInt(LPC_CMP_T * pACMP,uint8_t index,bool level,bool invert,CHIP_ACMP_EDGESEL_T edgeSel)114 void Chip_ACMP_SetupACMPInt(LPC_CMP_T *pACMP, uint8_t index, bool level,
115 bool invert, CHIP_ACMP_EDGESEL_T edgeSel)
116 {
117 /* Make sure interrupt flag is not set during read OR/AND and write operation */
118 uint32_t reg = (pACMP->ACMP[index].CMP & ~ACMP_INTFLAG_BIT) & ~(ACMP_INTPOL_BIT |
119 ACMP_INTTYPE_BIT | ACMP_INTEDGE_MASK);
120 /* For Level triggered interrupt, invert sets the polarity
121 For edge triggered interrupt edgeSel sets the edge type */
122 if (level) {
123 reg |= ACMP_INTTYPE_BIT;
124 if (invert) {
125 reg |= ACMP_INTPOL_BIT;
126 }
127 }
128 else {
129 reg |= (uint32_t) edgeSel;
130 }
131
132 pACMP->ACMP[index].CMP = reg;
133 }
134
135 /*Sets up voltage ladder */
Chip_ACMP_SetupVoltLadder(LPC_CMP_T * pACMP,uint8_t index,uint32_t ladsel,bool ladrefVDDCMP)136 void Chip_ACMP_SetupVoltLadder(LPC_CMP_T *pACMP, uint8_t index, uint32_t ladsel, bool ladrefVDDCMP)
137 {
138 /* Make sure interrupt flag is not set during read OR/AND and write operation */
139 uint32_t reg = (pACMP->ACMP[index].CMP & ~ACMP_INTFLAG_BIT) & ~(ACMP_LADSEL_MASK | ACMP_LADREF_BIT);
140
141 /* Setup voltage ladder and ladder reference */
142 if (!ladrefVDDCMP) {
143 reg |= ACMP_LADREF_BIT;
144 }
145 pACMP->ACMP[index].CMP = reg | (ladsel << 24);
146 }
147