1 /*
2 * Author: Jon Trulson <jtrulson@ics.com>
3 * Copyright (c) 2015 Intel Corporation.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining
6 * a copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sublicense, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be
14 * included in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25 #include <unistd.h>
26 #include <math.h>
27 #include <iostream>
28 #include <string>
29 #include <stdexcept>
30
31 #include "at42qt1070.h"
32
33 using namespace upm;
34 using namespace std;
35
36
AT42QT1070(int bus,uint8_t address)37 AT42QT1070::AT42QT1070(int bus, uint8_t address)
38 {
39 m_addr = address;
40
41 // setup our i2c link
42 if (!(m_i2c = mraa_i2c_init(bus))) {
43 throw std::invalid_argument(std::string(__FUNCTION__) +
44 ": mraa_i2c_init() failed");
45 return;
46 }
47
48 mraa_result_t rv;
49
50 if ((rv = mraa_i2c_address(m_i2c, m_addr)) != MRAA_SUCCESS) {
51 throw std::invalid_argument(std::string(__FUNCTION__) +
52 ": mraa_i2c_address() failed");
53 return;
54 }
55
56 if (readChipID() != 0x2E) {
57 throw std::runtime_error("Chip ID does not match the expected value (2Eh)");
58 }
59
60 m_buttonStates = 0;
61 m_calibrating = false;
62 m_overflow = false;
63 }
64
~AT42QT1070()65 AT42QT1070::~AT42QT1070()
66 {
67 mraa_i2c_stop(m_i2c);
68 }
69
70 bool
writeByte(uint8_t reg,uint8_t byte)71 AT42QT1070::writeByte(uint8_t reg, uint8_t byte)
72 {
73 mraa_result_t rv = mraa_i2c_write_byte_data(m_i2c, byte, reg);
74
75 if (rv != MRAA_SUCCESS) {
76 throw std::runtime_error(std::string(__FUNCTION__) +
77 ": mraa_i2c_write_byte() failed");
78 return false;
79 }
80
81 return true;
82 }
83
84 bool
writeWord(uint8_t reg,uint16_t word)85 AT42QT1070::writeWord(uint8_t reg, uint16_t word)
86 {
87 mraa_result_t rv = mraa_i2c_write_word_data(m_i2c, word, reg);
88
89 if (rv != MRAA_SUCCESS) {
90 throw std::runtime_error(std::string(__FUNCTION__) +
91 ": mraa_i2c_write_word() failed");
92 return false;
93 }
94
95 return true;
96 }
97
98 uint8_t
readByte(uint8_t reg)99 AT42QT1070::readByte(uint8_t reg)
100 {
101 return mraa_i2c_read_byte_data(m_i2c, reg);
102 }
103
104 uint16_t
readWord(uint8_t reg)105 AT42QT1070::readWord(uint8_t reg)
106 {
107 return mraa_i2c_read_word_data(m_i2c, reg);
108 }
109
110 uint8_t
readChipID(void)111 AT42QT1070::readChipID(void)
112 {
113 return readByte(REG_CHIPID);
114 }
115
116 void
updateState()117 AT42QT1070::updateState()
118 {
119 uint8_t stat = readByte(REG_DETSTATUS);
120
121 // if we are calibrating, don't change anything
122 if (stat & DET_CALIBRATE) {
123 m_calibrating = true;
124 return;
125 } else {
126 m_calibrating = false;
127 }
128
129 if (stat & DET_OVERFLOW)
130 m_overflow = true;
131 else
132 m_overflow = false;
133
134 // if a touch is occurring, read the button states
135 if (stat & DET_TOUCH) {
136 uint8_t keys = readByte(REG_KEYSTATUS);
137 // high bit is reserved, filter it out
138 m_buttonStates = keys & ~0x80;
139 } else {
140 m_buttonStates = 0;
141 }
142 }
143
144 uint8_t
getLPMode(void)145 AT42QT1070::getLPMode(void)
146 {
147 return readByte(REG_LP);
148 }
149
150 uint8_t
setLPMode(uint8_t mode)151 AT42QT1070::setLPMode(uint8_t mode)
152 {
153 writeByte(REG_LP, mode);
154
155 return getLPMode();
156 }
157
158 uint8_t
getAVE(uint8_t key)159 AT42QT1070::getAVE(uint8_t key)
160 {
161 uint8_t value, ave;
162
163 if (key > 6) {
164 throw std::invalid_argument("Only keys 0-6 are allowed");
165 }
166
167 value = readByte(REG_AVE0 + key);
168 ave = (value & 0xFC) >> 2;
169
170 return ave;
171 }
172
173 uint8_t
setAVE(uint8_t key,uint8_t ave)174 AT42QT1070::setAVE(uint8_t key, uint8_t ave)
175 {
176 uint8_t value;
177
178 if (key > 6) {
179 throw std::invalid_argument("Only keys 0-6 are allowed");
180 }
181
182 switch (ave) {
183 case 1:
184 case 2:
185 case 4:
186 case 8:
187 case 16:
188 case 32:
189 break;
190
191 default:
192 throw std::invalid_argument("Invalid averaging factor");
193 }
194
195 value = readByte(REG_AVE0 + key);
196 value = value & 0x03;
197 value = value | (ave << 2);
198 writeByte(REG_AVE0 + key, value);
199
200 return getAVE(key);
201 }
202
203 uint8_t
getAKSGroup(uint8_t key)204 AT42QT1070::getAKSGroup(uint8_t key)
205 {
206 uint8_t value, aks;
207
208 if (key > 6) {
209 throw std::invalid_argument("Only keys 0-6 are allowed");
210 }
211
212 value = readByte(REG_AVE0 + key);
213 aks = value & 0x03;
214
215 return aks;
216 }
217
218 uint8_t
setAKSGroup(uint8_t key,uint8_t group)219 AT42QT1070::setAKSGroup(uint8_t key, uint8_t group)
220 {
221 uint8_t value;
222
223 if (key > 6) {
224 throw std::invalid_argument("Only keys 0-6 are allowed");
225 }
226
227 if (group > 3) {
228 throw std::invalid_argument("Only groups 0-3 are allowed");
229 }
230
231 value = readByte(REG_AVE0 + key);
232 value = value & 0xFC;
233 value = value | group;
234
235 writeByte(REG_AVE0 + key, value);
236
237 return getAKSGroup(key);
238 }
239
240 bool
reset()241 AT42QT1070::reset()
242 {
243 // write a non-zero value to the reset register
244 return writeByte(REG_RESET, 0xff);
245 }
246
247 bool
calibrate()248 AT42QT1070::calibrate()
249 {
250 // write a non-zero value to the calibrate register
251 return writeByte(REG_CALIBRATE, 0xff);
252 }
253