added getMasterAddress() and isSlaveMaster()

src/lib/ebus/symbol.cpp

@@ -198,6 +198,21 @@ bool isMaster(unsigned char addr) {
 	    && ((addrLo == 0x0) || (addrLo == 0x1) || (addrLo == 0x3) || (addrLo == 0x7) || (addrLo == 0xF));
 }
 
+bool isSlaveMaster(unsigned char addr) {
+	return isMaster((unsigned char)(addr+256-5));
+}
+
+unsigned char getMasterAddress(unsigned char addr) {
+	if (isMaster(addr))
+		return addr;
+
+	addr = (unsigned char)(addr+256-5);
+	if (isMaster(addr))
+		return addr;
+
+	return SYN;
+}
+
 unsigned char getMasterNumber(unsigned char addr) {
 	unsigned char addrHi = (addr & 0xF0) >> 4;
 	unsigned char addrLo = (addr & 0x0F);

src/lib/ebus/symbol.h

@@ -156,6 +156,20 @@ private:
  */
 bool isMaster(unsigned char addr);
 
+/**
+ * Returns whether the address is a slave address of one of the 25 masters.
+ * @param addr the address to check.
+ * @return <code>true</code> if the specified address is a slave address of a master.
+ */
+bool isSlaveMaster(unsigned char addr);
+
+/**
+ * Returns the master address associated with the specified address (master or slave).
+ * @param addr the address to check.
+ * @return the master address, or SYN if the specified address is neither a master address nor a slave address of a master.
+ */
+unsigned char getMasterAddress(unsigned char addr);
+
 /**
  * Returns the number of the master if the address is a valid bus address.
  * @param addr the bus address.