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91 lines
2.4 KiB
C++
91 lines
2.4 KiB
C++
/*
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* Firmata is a generic protocol for communicating with microcontrollers
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* from software on a host computer. It is intended to work with
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* any host computer software package.
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*
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* To download a host software package, please clink on the following link
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* to open the download page in your default browser.
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*
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* http://firmata.org/wiki/Download
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*/
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/*
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* This firmware reads all inputs and sends them as fast as it can. It was
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* inspired by the ease-of-use of the Arduino2Max program.
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*
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* This example code is in the public domain.
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*/
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#include <Firmata.h>
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byte pin;
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int analogValue;
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int previousAnalogValues[TOTAL_ANALOG_PINS];
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byte portStatus[TOTAL_PORTS]; // each bit: 1=pin is digital input, 0=other/ignore
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byte previousPINs[TOTAL_PORTS];
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/* timer variables */
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unsigned long currentMillis; // store the current value from millis()
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unsigned long previousMillis; // for comparison with currentMillis
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/* make sure that the FTDI buffer doesn't go over 60 bytes, otherwise you
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get long, random delays. So only read analogs every 20ms or so */
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int samplingInterval = 19; // how often to run the main loop (in ms)
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void sendPort(byte portNumber, byte portValue)
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{
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portValue = portValue & portStatus[portNumber];
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if(previousPINs[portNumber] != portValue) {
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Firmata.sendDigitalPort(portNumber, portValue);
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previousPINs[portNumber] = portValue;
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}
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}
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void setup()
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{
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byte i, port, status;
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Firmata.setFirmwareVersion(0, 1);
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for(pin = 0; pin < TOTAL_PINS; pin++) {
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if IS_PIN_DIGITAL(pin) pinMode(PIN_TO_DIGITAL(pin), INPUT);
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}
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for (port=0; port<TOTAL_PORTS; port++) {
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status = 0;
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for (i=0; i<8; i++) {
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if (IS_PIN_DIGITAL(port * 8 + i)) status |= (1 << i);
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}
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portStatus[port] = status;
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}
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Firmata.begin(57600);
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}
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void loop()
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{
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byte i;
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for (i=0; i<TOTAL_PORTS; i++) {
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sendPort(i, readPort(i, 0xff));
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}
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/* make sure that the FTDI buffer doesn't go over 60 bytes, otherwise you
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get long, random delays. So only read analogs every 20ms or so */
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currentMillis = millis();
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if(currentMillis - previousMillis > samplingInterval) {
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previousMillis += samplingInterval;
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while(Firmata.available()) {
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Firmata.processInput();
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}
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for(pin = 0; pin < TOTAL_ANALOG_PINS; pin++) {
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analogValue = analogRead(pin);
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if(analogValue != previousAnalogValues[pin]) {
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Firmata.sendAnalog(pin, analogValue);
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previousAnalogValues[pin] = analogValue;
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}
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}
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}
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}
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