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/*
* Firmata is a generic protocol for communicating with microcontrollers
* from software on a host computer. It is intended to work with
* any host computer software package.
*
* To download a host software package, please click on the following link
* to open the list of Firmata client libraries in your default browser.
*
* https://github.com/firmata/arduino#firmata-client-libraries
*/
/*
* 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]; // each bit: 1=pin is digital input, 0=other/ignore
byte previousPINs[TOTAL_PORTS];
/* timer variables */
unsigned long currentMillis; // store the current value from millis()
unsigned long previousMillis; // 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()
{
byte i, port, status;
Firmata.setFirmwareVersion(FIRMATA_FIRMWARE_MAJOR_VERSION, FIRMATA_FIRMWARE_MINOR_VERSION);
for (pin = 0; pin < TOTAL_PINS; pin++) {
if IS_PIN_DIGITAL(pin) pinMode(PIN_TO_DIGITAL(pin), INPUT);
}
for (port = 0; port < TOTAL_PORTS; port++) {
status = 0;
for (i = 0; i < 8; i++) {
if (IS_PIN_DIGITAL(port * 8 + i)) status |= (1 << i);
}
portStatus[port] = status;
}
Firmata.begin(57600);
}
void loop()
{
byte i;
for (i = 0; i < TOTAL_PORTS; i++) {
sendPort(i, readPort(i, 0xff));
}
/* 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 - previousMillis > samplingInterval) {
previousMillis += 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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