forked from IanF/OneWireArduinoSlaveATTINY85
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62 lines
1.4 KiB
62 lines
1.4 KiB
#include "OWSlave.h" |
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#define LEDPin 13 |
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#define OWPin 2 |
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#define InterruptNumber 0 // Must correspond to the OWPin to correctly detect state changes. On Arduino Uno, interrupt 0 is for digital pin 2 |
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unsigned char rom[8] = {0xE2, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00}; |
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volatile long prevInt = 0; // Previous Interrupt micros |
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volatile boolean owReset = false; |
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OWSlave oneWire(OWPin); |
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void setup() |
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{ |
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pinMode(LEDPin, OUTPUT); |
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pinMode(OWPin, INPUT); |
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digitalWrite(LEDPin, LOW); |
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attachInterrupt(InterruptNumber,onewireInterrupt,CHANGE); |
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oneWire.setRom(rom); |
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} |
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void loop() |
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{ |
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if (owReset) owHandler(); |
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} |
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void owHandler(void) |
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{ |
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detachInterrupt(InterruptNumber); |
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owReset=false; |
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if (oneWire.presence()) { |
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if (oneWire.recvAndProcessCmd()) { |
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uint8_t cmd = oneWire.recv(); |
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if (cmd == 0x44) { |
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digitalWrite(LEDPin, HIGH); |
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} |
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if (cmd == 0xBE) { |
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for( int i = 0; i < 9; i++) { |
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oneWire.send((byte)0); |
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} |
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} |
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} |
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} |
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attachInterrupt(InterruptNumber,onewireInterrupt,CHANGE); |
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} |
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void onewireInterrupt(void) |
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{ |
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volatile long lastMicros = micros() - prevInt; |
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prevInt = micros(); |
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if (lastMicros >= 410 && lastMicros <= 550) |
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{ |
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// OneWire Reset Detected |
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owReset=true; |
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} |
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} |
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