Merge pull request #6 from ntruchsess/searchcommands

Add conditional-search and resume commands

OneWireSlave.cpp

@@ -46,6 +46,8 @@ byte OneWireSlave::receivingByte_;
 byte OneWireSlave::searchRomBytePos_;
 byte OneWireSlave::searchRomBitPos_;
 bool OneWireSlave::searchRomInverse_;
+bool OneWireSlave::resumeCommandFlag_;
+bool OneWireSlave::alarmedFlag_;
 
 const byte* OneWireSlave::sendBuffer_;
 byte* OneWireSlave::recvBuffer_;
@@ -77,6 +79,9 @@ void OneWireSlave::begin(const byte* rom, byte pinNumber)
 	memcpy(rom_, rom, 7);
 	rom_[7] = crc8(rom_, 7);
 
+	resumeCommandFlag_ = false;
+	alarmedFlag_       = false;
+
 	clientReceiveBitCallback_ = 0;
 
 	// log("Enabling 1-wire library")
@@ -146,6 +151,11 @@ void OneWireSlave::stopWrite()
 	write(0, 0, 0);
 }
 
+void OneWireSlave::alarmed(bool value)
+{
+	alarmedFlag_ = value;
+}
+
 byte OneWireSlave::crc8(const byte* data, short numBytes)
 {
 	byte crc = 0;
@@ -407,18 +417,41 @@ void OneWireSlave::onBitReceived_(bool bit, bool error)
 			switch (receivingByte_)
 			{
 			case 0xF0: // SEARCH ROM
+				resumeCommandFlag_ = false;
 				beginSearchRom_();
 				return;
+			case 0xEC: // CONDITIONAL SEARCH ROM
+				resumeCommandFlag_ = false;
+				if (alarmedFlag_)
+				{
+					beginSearchRom_();
+				}
+				else
+				{
+					beginWaitReset_();
+				}
+				return;
 			case 0x33: // READ ROM
+				resumeCommandFlag_ = false;
 				beginWriteBytes_(rom_, 8, &OneWireSlave::noOpCallback_);
 				return;
 			case 0x55: // MATCH ROM
+				resumeCommandFlag_ = false;
 				beginReceiveBytes_(scratchpad_, 8, &OneWireSlave::matchRomBytesReceived_);
 				return;
 			case 0xCC: // SKIP ROM
-				// emulate a match rom operation
-				memcpy(scratchpad_, rom_, 8);
-				matchRomBytesReceived_(false);
+				resumeCommandFlag_ = false;
+				beginReceiveBytes_(scratchpad_, 1, &OneWireSlave::notifyClientByteReceived_);
+				return;
+			case 0xA5: // RESUME
+				if (resumeCommandFlag_)
+				{
+					beginReceiveBytes_(scratchpad_, 1, &OneWireSlave::notifyClientByteReceived_);
+				}
+				else
+				{
+					beginWaitReset_();
+				}
 				return;
 			default:
 				ERROR("Unknown command");
@@ -582,6 +615,7 @@ void OneWireSlave::matchRomBytesReceived_(bool error)
 {
 	if (error)
 	{
+		resumeCommandFlag_ = false;
 		ERROR("error receiving match rom bytes");
 		return;
 	}
@@ -589,13 +623,13 @@ void OneWireSlave::matchRomBytesReceived_(bool error)
 	if (memcmp(rom_, scratchpad_, 8) == 0)
 	{
 		// log("ROM matched");
-
+		resumeCommandFlag_ = true;
 		beginReceiveBytes_(scratchpad_, 1, &OneWireSlave::notifyClientByteReceived_);
 	}
 	else
 	{
 		// log("ROM not matched");
-
+		resumeCommandFlag_ = false;
 		beginWaitReset_();
 	}
 }

OneWireSlave.h

@@ -35,6 +35,8 @@ public:
 	//! Cancels any pending write operation, started by writeBit or write. If this function is called before the master asked for a bit, then nothing is sent to the master.
 	void stopWrite();
 
+	void alarmed(bool value);
+
 	static byte crc8(const byte* data, short numBytes);
 
 private:
@@ -102,6 +104,8 @@ private:
 	static byte searchRomBytePos_;
 	static byte searchRomBitPos_;
 	static bool searchRomInverse_;
+	static bool resumeCommandFlag_;
+	static bool alarmedFlag_;
 
 	static const byte* sendBuffer_;
 	static byte* recvBuffer_;