An arduino library to communicate using the Dallas one-wire protocol, where the Arduino takes the role of a slave.
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

85 lines
3.0 KiB

#ifndef _OneWireSlave_h_
#define _OneWireSlave_h_
#include "Arduino.h"
10 years ago
#include "LowLevel.h"
class OneWireSlave
{
public:
///! Starts listening for the 1-wire master, on the specified pin, as a virtual slave device identified by the specified ROM (7 bytes, starting from the family code, CRC will be computed internally). Reset, Presence, SearchRom and MatchRom are handled automatically. The library will use the external interrupt on the specified pin (note that this is usually not possible with all pins, depending on the board), as well as one hardware timer. Blocking interrupts (either by disabling them explicitely with sei/cli, or by spending time in another interrupt) can lead to malfunction of the library, due to tight timing for some 1-wire operations.
void begin(byte* rom, byte pinNumber);
///! Stops all 1-wire activities, which frees hardware resources for other purposes.
void end();
///! Pops one byte from the receive buffer, or returns false if no byte has been received.
bool read(byte& b);
///! Sets (or replaces) a function to be called when at least one byte has been received. Callbacks are executed from interrupts and should be as short as possible.
void setReceiveCallback(void(*callback)());
///! Enqueues the specified bytes in the send buffer. They will be sent in the background. The optional callback is used to notify when the bytes are sent, or if an error occured. Callbacks are executed from interrupts and should be as short as possible.
void write(byte* bytes, short numBytes, void(*complete)(bool error));
10 years ago
private:
static byte crc8_(byte* data, short numBytes);
10 years ago
static void setTimerEvent_(short delayMicroSeconds, void(*handler)());
static void disableTimer_();
10 years ago
static void onEnterInterrupt_();
static void onLeaveInterrupt_();
10 years ago
static void error_(const char* message);
10 years ago
static void pullLow_();
static void releaseBus_();
10 years ago
static void beginReceiveBit_(void(*completeCallback)(bool bit, bool error));
static void beginSendBit_(bool bit, void(*completeCallback)(bool error));
static void beginWaitReset_();
static void beginWaitCommand_();
static void beginReceive_();
static void onBitReceived_(bool bit, bool error);
static void beginSearchRom_();
static void beginSearchRomSendBit_();
static void continueSearchRom_(bool error);
static void searchRomOnBitReceived_(bool bit, bool error);
10 years ago
// interrupt handlers
static void waitReset_();
static void beginPresence_();
static void endPresence_();
static void receive_();
static void readBit_();
static void sendBitOne_();
static void sendBitZero_();
static void endSendBitZero_();
10 years ago
private:
static byte rom_[8];
static Pin pin_;
static byte tccr1bEnable_;
static unsigned long resetStart_;
static unsigned long lastReset_;
static void(*receiveBitCallback_)(bool bit, bool error);
static void(*bitSentCallback_)(bool error);
static byte receivingByte_;
static byte receivingBitPos_;
static byte receiveTarget_;
static byte searchRomBytePos_;
static byte searchRomBitPos_;
static bool searchRomInverse_;
};
extern OneWireSlave OneWire;
#endif