adt7410: add connection test and for that matter connection method

Signed-off-by: deadprogram <ron@hybridgroup.com>

adt7410/registers.go

@@ -1,8 +1,33 @@
 package adt7410
 
+// 0x00 Temperature value most significant byte 0x00
+// 0x01 Temperature value least significant byte 0x00
+// 0x02 Status 0x00
+// 0x03 Configuration 0x00
+// 0x04 THIGH setpoint most significant byte 0x20 (64°C)
+// 0x05 THIGH setpoint least significant byte 0x00 (64°C)
+// 0x06 TLOW setpoint most significant byte 0x05 (10°C)
+// 0x07 TLOW setpoint least significant byte 0x00 (10°C)
+// 0x08 TCRIT setpoint most significant byte 0x49 (147°C)
+// 0x09 TCRIT setpoint least significant byte 0x80 (147°C)
+// 0x0A THYST setpoint 0x05 (5°C)
+// 0x0B ID 0xCX
+// 0x0C Reserved 0xXX
+// 0x0D Reserved 0xXX
+// 0x2E Reserved 0xXX
+// 0x2F Software reset 0xXX
+
 const (
-	// Default I2C address
+	// Address is default I2C address.
 	Address = 0x48
+	// Address1 is for first device, aka the default.
+	Address1 = Address
+	// Address2 is for second device.
+	Address2 = 0x49
+	// Address3 is for third device.
+	Address3 = 0x4A
+	// Address4 is for fourth device.
+	Address4 = 0x4B
 
 	// Temperature Value MSB Register
 	RegTempValueMSB = 0x0
@@ -16,7 +41,28 @@ const (
 	// Config Register
 	RegConfig = 0x3
 
-	// ID Register
+	// THIGH setpoint most significant byte 0x20 (64°C)
+	RegTHIGHMsbReg = 0x4
+
+	// THIGH setpoint least significant byte 0x00 (64°C)
+	RegTHIGHLsbReg = 0x5
+
+	// TLOW setpoint most significant byte 0x05 (10°C)
+	RegTLOWMsbReg = 0x6
+
+	// TLOW setpoint least significant byte 0x00 (10°C)
+	RegTLOWLsbReg = 0x7
+
+	// TCRIT setpoint most significant byte 0x49 (147°C)
+	RegTCRITMsbReg = 0x8
+
+	// TCRIT setpoint least significant byte 0x80 (147°C)
+	RegTCRITLsbReg = 0x9
+
+	// THYST setpoint 0x05 (5°C)
+	RegTHYSTReg = 0xA
+
+	// ID Register (0xCx)
 	RegID = 0x0B
 
 	// Software Reset Register