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/*
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;
}
boolean _Esplora::readJoystickButton() {
if (readChannel(CH_JOYSTICK_SW) == 1023) {
return HIGH;
} else if (readChannel(CH_JOYSTICK_SW) == 0) {
return 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;
}
}
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