1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
/* ---------------------------------------------------------------------------- */
/* Atmel Microcontroller Software Support */
/* SAM Software Package License */
/* ---------------------------------------------------------------------------- */
/* Copyright (c) 2015, Atmel Corporation */
/* */
/* All rights reserved. */
/* */
/* Redistribution and use in source and binary forms, with or without */
/* modification, are permitted provided that the following condition is met: */
/* */
/* - Redistributions of source code must retain the above copyright notice, */
/* this list of conditions and the disclaimer below. */
/* */
/* Atmel's name may not be used to endorse or promote products derived from */
/* this software without specific prior written permission. */
/* */
/* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR */
/* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE */
/* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, */
/* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT */
/* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, */
/* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF */
/* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING */
/* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, */
/* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
/* ---------------------------------------------------------------------------- */
/** \addtogroup acc_module Working with ACC
* \ingroup peripherals_module
* The ACC driver provides the interface to configure and use the ACC
* peripheral.\n
*
* It applies comparison on two inputs and gives a compare output.
*
* To Enable a ACC Comparison,the user has to follow these few steps:
* <ul>
* <li> Enable ACC peripheral clock by setting the corresponding bit in
* PMC_PCER1 (PMC Peripheral Clock Enable Register 1)
* </li>
* <li> Reset the controller by asserting ACC_CR_SWRST in ACC_CR(ACC Control
* Register) </li>
* <li> Configure the mode as following steps: </li>
* -# Select inputs for SELMINUS and SELPLUS in ACC_MR (ACC Mode Register).
* -# Enable Analog Comparator by setting ACEN in ACC_MR.
* -# Configure Edge Type to detect different compare output.
* </li>
* <li> Wait until the automatic mask period expires by polling MASK bit in
* ACC_ISR.
* </ul>
*
* For more accurate information, please look at the ACC section of the
* Datasheet.
*
* Related files :\n
* \ref acc.c\n
* \ref acc.h\n
*/
/*@{*/
/*@}*/
/**
* \file
*
* Implementation of Analog Comparator Controller (ACC).
*
*/
/*----------------------------------------------------------------------------
* Headers
*----------------------------------------------------------------------------*/
#include "chip.h"
#include "acc.h"
/*----------------------------------------------------------------------------
* Exported functions
*----------------------------------------------------------------------------*/
/**
* \brief Initialize the ACC controller
*
* \param pAcc Pointer to an Acc instance.
* \param idAcc ACC identifier
* \param ucSelplus input connected to inp, 0~7
* \param ucSelminus input connected to inm,0~7
* \param wAc_en Analog comparator enabled/disabled
* \param wEdge CF flag triggering mode
* \param wInvert INVert comparator output,use pattern defined in the device
* header file
*/
extern void ACC_Configure(Acc *pAcc, uint8_t idAcc, uint8_t ucSelplus,
uint8_t ucSelminus, uint16_t wAc_en, uint16_t wEdge, uint16_t wInvert)
{
/* Enable peripheral clock*/
PMC->PMC_PCER1 = 1 << (idAcc - 32);
/* Reset the controller */
pAcc->ACC_CR |= ACC_CR_SWRST;
/* Write to the MR register */
ACC_CfgModeReg(pAcc,
((ucSelplus << ACC_MR_SELPLUS_Pos) & ACC_MR_SELPLUS_Msk) |
((ucSelminus << ACC_MR_SELMINUS_Pos) & ACC_MR_SELMINUS_Msk) |
((wAc_en << 8) & ACC_MR_ACEN) |
((wEdge << ACC_MR_EDGETYP_Pos) & ACC_MR_EDGETYP_Msk) |
((wInvert << 12) & ACC_MR_INV));
/* set hysteresis and current option*/
pAcc->ACC_ACR = (ACC_ACR_ISEL_HISP
| ((0x01 << ACC_ACR_HYST_Pos) & ACC_ACR_HYST_Msk));
/* Automatic Output Masking Period*/
while (pAcc->ACC_ISR & (uint32_t)ACC_ISR_MASK);
}
/**
* Return the Channel Converted Data
* \param pAcc Pointer to an Acc instance.
* \param ucSelplus input applied on ACC SELPLUS
* \param ucSelminus input applied on ACC SELMINUS
*/
extern void ACC_SetComparisonPair(Acc *pAcc, uint8_t ucSelplus,
uint8_t ucSelminus)
{
uint32_t dwTemp;
assert(ucSelplus < 8 && ucSelminus < 8);
dwTemp = pAcc->ACC_MR;
pAcc->ACC_MR =
dwTemp & (uint32_t) ((~ACC_MR_SELMINUS_Msk) & (~ACC_MR_SELPLUS_Msk));
pAcc->ACC_MR |= (((ucSelplus << ACC_MR_SELPLUS_Pos) & ACC_MR_SELPLUS_Msk) |
((ucSelminus << ACC_MR_SELMINUS_Pos) & ACC_MR_SELMINUS_Msk));
}
/**
* Return Comparison Result
* \param pAcc Pointer to an Acc instance.
* \param dwStatus value of ACC_ISR
*/
extern uint32_t ACC_GetComparisonResult(Acc *pAcc, uint32_t dwStatus)
{
uint32_t dwTemp = pAcc->ACC_MR;
if ((dwTemp & ACC_MR_INV) == ACC_MR_INV) {
if (dwStatus & ACC_ISR_SCO) {
return 0; /* inn>inp*/
} else {
return 1;/* inp>inn*/
}
} else {
if (dwStatus & ACC_ISR_SCO) {
return 1; /* inp>inn*/
} else {
return 0;/* inn>inp*/
}
}
}
|
