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FakeD2413.ino

@@ -1,3 +1,18 @@
+/*  Ian Fleet 2018
+
+    All files, software, schematics and designs are provided as-is with no warranty.
+    All files, software, schematics and designs are for experimental/hobby use.
+    Under no circumstances should any part be used for critical systems where safety,
+    life or property depends upon it. You are responsible for all use.
+    You are free to use, modify, derive or otherwise extend for your own purposes
+
+*/
+
+
+// This example emulates a DS2413 device on an Arduino UNO or ATTINY85
+// note : physical DS2413 devices found in 2018 are often clones with
+// a device code different to the Maxim datasheet
+
 #include "Arduino.h"
 #include "OneWireSlave.h"
 #include "comptime.h"
@@ -13,7 +28,7 @@ Pin oneWireData(2); // PB2 only attiny85 pin with rising/falling interrupts
 // This sample emulates a DS2413 device , so we start by defining the available commands
 
 const byte DS2413_FAMILY_ID    = 0x3A; // Maxim DS2413 device code
-const byte CLONE_FAMILY_ID     = 0x85; // Chinese clone device code
+const byte CLONE_FAMILY_ID     = 0x85; // clone device code
 const byte DS2413_ACCESS_READ  = 0xF5;
 const byte DS2413_ACCESS_WRITE = 0x5A;
 const byte DS2413_ACK_SUCCESS  = 0xAA;
@@ -90,13 +105,13 @@ static uint8_t getstatus() {
 
 //////////////////////////////////////////
 
-static void port(int led, bool stat) {
+static void port(int PIO, bool stat) {
   if (stat) {
-    digitalWrite(led, HIGH);
-    pinMode(led, INPUT);
+    digitalWrite(PIO, HIGH);
+    pinMode(PIO, INPUT);
   } else {
-    pinMode(led, OUTPUT);
-    digitalWrite(led, LOW);
+    pinMode(PIO, OUTPUT);
+    digitalWrite(PIO, LOW);
   }
 }
 
@@ -107,7 +122,7 @@ static void set(uint8_t val) {
   latch = val;
   port(PIOA, latch & 1);
   port(PIOB, latch & 2);
-  //eeprom_write_byte((uint8_t*)10, (unsigned char)latch);
+  //TODO copy latch to EEPROM
 }
 
 //////////////////////////////////////////
@@ -124,8 +139,6 @@ void owReceive(OneWireSlave::ReceiveEvent evt, byte data)
           {
             case DS2413_ACCESS_WRITE:
               state = DS_WaitingStatus1;
-
-              //OWSlave.beginWriteBit(0, true); // send zeros as long as the conversion is not finished
               break;
 
             case DS2413_ACCESS_READ:
@@ -153,7 +166,7 @@ void owReceive(OneWireSlave::ReceiveEvent evt, byte data)
             set(statusbyte1);
             response[0] = DS2413_ACK_SUCCESS;
           } else  {
-            response[0] = 0x11; // mark error
+            response[0] = 0x11; // mark error - real DS2413 does not do this
           }
           response[1] = getstatus();
           OWSlave.beginWrite((const byte*)response, 2, 0);