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
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
/*
Esplora.cpp - Arduino Esplora board library
Written by Enrico Gueli
Copyright (c) 2012 Arduino(TM) All right reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "Esplora.h"
_Esplora Esplora;
/*
* The following constants tell, for each accelerometer
* axis, which values are returned when the axis measures
* zero acceleration.
*/
const int ACCEL_ZERO_X = 320;
const int ACCEL_ZERO_Y = 330;
const int ACCEL_ZERO_Z = 310;
const byte MUX_ADDR_PINS[] = { A0, A1, A2, A3 };
const byte MUX_COM_PIN = A4;
const int JOYSTICK_DEAD_ZONE = 100;
const byte RED_PIN = 5;
const byte BLUE_PIN = 9;
const byte GREEN_PIN = 10;
const byte BUZZER_PIN = 6;
// non-multiplexer Esplora pins:
// Accelerometer: x-A5, y-A7, z-A6
// External outputs: D3, D11
// Buzzer: A8
// RGB Led: red-D5, green-D10/A11, blue-D9/A10
// Led 13: D13
const byte ACCEL_X_PIN = A5;
const byte ACCEL_Y_PIN = A11;
const byte ACCEL_Z_PIN = A6;
const byte LED_PIN = 13;
_Esplora::_Esplora() {
for (byte p=0; p<4; p++) {
pinMode(MUX_ADDR_PINS[p], OUTPUT);
}
pinMode(RED_PIN, OUTPUT);
pinMode(GREEN_PIN, OUTPUT);
pinMode(BLUE_PIN, OUTPUT);
}
unsigned int _Esplora::readChannel(byte channel) {
digitalWrite(MUX_ADDR_PINS[0], (channel & 1) ? HIGH : LOW);
digitalWrite(MUX_ADDR_PINS[1], (channel & 2) ? HIGH : LOW);
digitalWrite(MUX_ADDR_PINS[2], (channel & 4) ? HIGH : LOW);
digitalWrite(MUX_ADDR_PINS[3], (channel & 8) ? HIGH : LOW);
// workaround to cope with lack of pullup resistor on joystick switch
if (channel == CH_JOYSTICK_SW) {
pinMode(MUX_COM_PIN, INPUT_PULLUP);
unsigned int joystickSwitchState = (digitalRead(MUX_COM_PIN) == HIGH) ? 1023 : 0;
digitalWrite(MUX_COM_PIN, LOW);
return joystickSwitchState;
}
else
return analogRead(MUX_COM_PIN);
}
boolean _Esplora::joyLowHalf(byte joyCh) {
return (readChannel(joyCh) < 512 - JOYSTICK_DEAD_ZONE)
? LOW : HIGH;
}
boolean _Esplora::joyHighHalf(byte joyCh) {
return (readChannel(joyCh) > 512 + JOYSTICK_DEAD_ZONE)
? LOW : HIGH;
}
boolean _Esplora::readButton(byte ch) {
if (ch >= SWITCH_1 && ch <= SWITCH_4) {
ch--;
}
switch(ch) {
case JOYSTICK_RIGHT:
return joyLowHalf(CH_JOYSTICK_X);
case JOYSTICK_LEFT:
return joyHighHalf(CH_JOYSTICK_X);
case JOYSTICK_UP:
return joyLowHalf(CH_JOYSTICK_Y);
case JOYSTICK_DOWN:
return joyHighHalf(CH_JOYSTICK_Y);
}
unsigned int val = readChannel(ch);
return (val > 512) ? HIGH : LOW;
}
void _Esplora::writeRGB(byte r, byte g, byte b) {
writeRed(r);
writeGreen(g);
writeBlue(b);
}
#define RGB_FUNC(name, pin, lastVar) \
void _Esplora::write##name(byte val) { \
if (val == lastVar) \
return; \
analogWrite(pin, val); \
lastVar = val; \
delay(5); \
} \
\
byte _Esplora::read##name() { \
return lastVar; \
}
RGB_FUNC(Red, RED_PIN, lastRed)
RGB_FUNC(Green, GREEN_PIN, lastGreen)
RGB_FUNC(Blue, BLUE_PIN, lastBlue)
void _Esplora::tone(unsigned int freq) {
if (freq > 0)
::tone(BUZZER_PIN, freq);
else
::noTone(BUZZER_PIN);
}
void _Esplora::tone(unsigned int freq, unsigned long duration) {
if (freq > 0)
::tone(BUZZER_PIN, freq, duration);
else
::noTone(BUZZER_PIN);
}
void _Esplora::noTone() {
::noTone(BUZZER_PIN);
}
int _Esplora::readTemperature(const byte scale) {
long rawT = readChannel(CH_TEMPERATURE);
if (scale == DEGREES_C) {
return (int)((rawT * 500 / 1024) - 50);
}
else if (scale == DEGREES_F) {
return (int)((rawT * 450 / 512 ) - 58);
}
else {
return readTemperature(DEGREES_C);
}
}
int _Esplora::readAccelerometer(const byte axis) {
switch (axis) {
case X_AXIS: return analogRead(ACCEL_X_PIN) - ACCEL_ZERO_X;
case Y_AXIS: return analogRead(ACCEL_Y_PIN) - ACCEL_ZERO_Y;
case Z_AXIS: return analogRead(ACCEL_Z_PIN) - ACCEL_ZERO_Z;
default: return 0;
}
}
|
