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/*
* This firmware reads all inputs and sends them as fast as it can. It was
* inspired by the ease-of-use of the Arduino2Max program.
*
* This example code is in the public domain.
*/
#include <Firmata.h>
byte pin;
int analogValue;
int previousAnalogValues[TOTAL_ANALOG_PINS];
byte portStatus[TOTAL_PORTS];
byte previousPINs[TOTAL_PORTS];
/* timer variables */
unsigned long currentMillis; // store the current value from millis()
unsigned long nextExecuteMillis; // for comparison with currentMillis
/* make sure that the FTDI buffer doesn't go over 60 bytes, otherwise you
get long, random delays. So only read analogs every 20ms or so */
int samplingInterval = 19; // how often to run the main loop (in ms)
void sendPort(byte portNumber, byte portValue)
{
portValue = portValue &~ portStatus[portNumber];
if(previousPINs[portNumber] != portValue) {
Firmata.sendDigitalPort(portNumber, portValue);
previousPINs[portNumber] = portValue;
}
}
void setup()
{
Firmata.setFirmwareVersion(0, 1);
for(pin = 0; pin < TOTAL_DIGITAL_PINS; pin++) {
pinMode(pin, INPUT);
}
portStatus[0] = B00000011; // ignore Tx/RX pins
portStatus[1] = B11000000; // ignore 14/15 pins
portStatus[2] = B00000000;
Firmata.begin(57600);
}
void loop()
{
sendPort(0, PIND);
sendPort(1, PINB);
sendPort(2, PINC);
/* make sure that the FTDI buffer doesn't go over 60 bytes, otherwise you
get long, random delays. So only read analogs every 20ms or so */
currentMillis = millis();
if(currentMillis > nextExecuteMillis) {
nextExecuteMillis = currentMillis + samplingInterval;
while(Firmata.available()) {
Firmata.processInput();
}
for(pin = 0; pin < TOTAL_ANALOG_PINS; pin++) {
analogValue = analogRead(pin);
if(analogValue != previousAnalogValues[pin]) {
Firmata.sendAnalog(pin, analogValue);
previousAnalogValues[pin] = analogValue;
}
}
}
}
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