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