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/* Supports as many digital inputs and outputs as possible.
*
* This example code is in the public domain.
*/
#include <Firmata.h>
byte previousPIN[2]; // PIN means PORT for input
byte previousPORT[2];
void outputPort(byte portNumber, byte portValue)
{
// only send the data when it changes, otherwise you get too many messages!
if(previousPIN[portNumber] != portValue) {
Firmata.sendDigitalPort(portNumber, portValue);
previousPIN[portNumber] = portValue;
Firmata.sendDigitalPort(portNumber, portValue);
}
}
void setPinModeCallback(byte pin, int mode) {
if(pin > 1) { // don't touch RxTx pins (0,1)
pinMode(pin, mode);
}
}
void digitalWriteCallback(byte port, int value)
{
byte i;
byte currentPinValue, previousPinValue;
if(value != previousPORT[port]) {
for(i=0; i<8; i++) {
currentPinValue = (byte) value & (1 << i);
previousPinValue = previousPORT[port] & (1 << i);
if(currentPinValue != previousPinValue) {
digitalWrite(i + (port*8), currentPinValue);
}
}
previousPORT[port] = value;
}
}
void setup()
{
Firmata.setFirmwareVersion(0, 1);
Firmata.attach(DIGITAL_MESSAGE, digitalWriteCallback);
Firmata.attach(SET_PIN_MODE, setPinModeCallback);
Firmata.begin(57600);
}
void loop()
{
outputPort(0, PIND &~ B00000011); // pins 0-7, ignoring Rx/Tx pins (0/1)
outputPort(1, PINB); // pins 8-13
while(Firmata.available()) {
Firmata.processInput();
}
}
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