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