forked from IanF/OneWireArduinoSlaveATTINY85
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117 lines
2.2 KiB
117 lines
2.2 KiB
#include "Arduino.h" |
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#include "LowLevel.h" |
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#include "SerialChannel.h" |
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#include "OneWireSlave.h" |
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#define LEDPin 13 |
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#define OWPin 2 |
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#ifdef ENABLE_SERIAL_CHANNEL |
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SerialChannel debug("debug"); |
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#endif |
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Pin led(LEDPin); |
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byte owROM[7] = { 0xE2, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02 }; |
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byte acknowledge = 0x42; |
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byte commandCheckError = 0xF1; |
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int turnOnTimeoutSeconds = 5 * 60; |
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const byte CMD_TurnOn = 0x01; |
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const byte CMD_TurnOff = 0x02; |
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const byte CMD_ReadState = 0x03; |
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const byte ANS_StateIsOn = 0x01; |
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const byte ANS_StateIsOff = 0x02; |
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volatile byte command = 0x0; |
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volatile long turnOnStartTime = 0; |
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void owReceive(OneWireSlave::ReceiveEvent evt, byte data); |
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void setup() |
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{ |
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led.outputMode(); |
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led.writeLow(); |
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OneWire.setReceiveCallback(&owReceive); |
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OneWire.begin(owROM, OWPin); |
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Serial.begin(9600); |
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} |
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void loop() |
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{ |
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delay(1); |
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long now = millis(); |
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if (now > turnOnStartTime + (long)turnOnTimeoutSeconds * 1000 || now < turnOnStartTime) |
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{ |
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led.writeLow(); |
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turnOnStartTime = 0; |
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} |
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cli();//disable interrupts |
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#ifdef ENABLE_SERIAL_CHANNEL |
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SerialChannel::swap(); |
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#endif |
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sei();//enable interrupts |
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#ifdef ENABLE_SERIAL_CHANNEL |
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SerialChannel::flush(); |
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#endif |
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} |
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void owReceive(OneWireSlave::ReceiveEvent evt, byte data) |
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{ |
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switch (evt) |
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{ |
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case OneWireSlave::RE_Byte: |
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if (command == 0x00) |
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{ |
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command = data; |
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} |
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else |
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{ |
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if (data == (0xFF-command)) // to check there is no communication error, the master must send the command, and then its inverse |
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{ |
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byte receivedCommand = command; |
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command = 0x0; |
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switch (receivedCommand) |
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{ |
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case CMD_TurnOn: |
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turnOnStartTime = millis(); |
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led.writeHigh(); |
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OneWire.write(&acknowledge, 1, NULL); |
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break; |
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case CMD_TurnOff: |
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led.writeLow(); |
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turnOnStartTime = 0; |
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OneWire.write(&acknowledge, 1, NULL); |
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break; |
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case CMD_ReadState: |
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bool state = led.read(); |
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static byte response[2]; |
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response[0] = state ? ANS_StateIsOn : ANS_StateIsOff; |
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response[1] = 0xFF - response[0]; |
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OneWire.write(response, 2, NULL); |
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break; |
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} |
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} |
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else |
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{ |
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command = 0x0; |
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OneWire.write(&commandCheckError, 1, NULL); |
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} |
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} |
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break; |
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case OneWireSlave::RE_Reset: |
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case OneWireSlave::RE_Error: |
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command = 0x0; |
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break; |
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default: |
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; |
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} |
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}
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