generate unique serial number (#90) (#131)

* generate unique serial number (#90)

* see https://github.com/ricaun/ArduinoUniqueID

* calculated from ESP.getEfuseMac() on ESP32

* ESP.getChipId() on ESP8266

* SERIAL_NUMBER_WORD_0-3 on SAMD

* HAL_GetUIDw0-2() on STM32

* defaults to 0x01020304 on other platforms

* fix variable name for ESP platform

* another fix variable name for ESP platform (need more coffee...)

src/esp32_platform.cpp

@@ -37,6 +37,18 @@ void Esp32Platform::macAddress(uint8_t * addr)
     esp_wifi_get_mac(WIFI_IF_STA, addr);
 }
 
+uint32_t Esp32Platform::uniqueSerialNumber()
+{
+    uint64_t chipid = ESP.getEfuseMac();
+    uint32_t upperId = (chipid >> 32) & 0xFFFFFFFF;
+    uint32_t lowerId = (chipid & 0xFFFFFFFF);
+    uint32_t uniqueId = (upperId ^ lowerId);
+    
+    Serial.printf("uniqueSerialNumber: %0X ^ %0X ==> %0X\n", upperId, lowerId, uniqueId);
+
+    return uniqueId;
+}
+
 void Esp32Platform::restart()
 {
     println("restart");

src/esp32_platform.h

@@ -16,6 +16,9 @@ public:
     uint32_t currentDefaultGateway() override;
     void macAddress(uint8_t* addr) override;
 
+    // unique serial number
+    uint32_t uniqueSerialNumber() override;
+
     // basic stuff
     void restart();
 

src/esp_platform.cpp

@@ -38,6 +38,15 @@ void EspPlatform::macAddress(uint8_t * addr)
     wifi_get_macaddr(STATION_IF, addr);
 }
 
+uint32_t EspPlatform::uniqueSerialNumber()
+{
+    uint32_t chipid = ESP.getChipId();
+    
+    Serial.printf("uniqueSerialNumber: %0X\n", chipid);
+
+    return chipid;
+}
+
 void EspPlatform::restart()
 {
     println("restart");

src/esp_platform.h

@@ -16,6 +16,9 @@ class EspPlatform : public ArduinoPlatform
     uint32_t currentDefaultGateway() override;
     void macAddress(uint8_t* addr) override;
 
+    // unique serial number
+    uint32_t uniqueSerialNumber() override;
+
     // basic stuff
     void restart();
 
@@ -30,7 +33,7 @@ class EspPlatform : public ArduinoPlatform
     void commitToEeprom();
 private:
     WiFiUDP _udp;
-	uint32_t _mulitcastAddr;
+    uint32_t _mulitcastAddr;
     uint16_t _mulitcastPort;
 };
 

src/knx/platform.cpp

@@ -72,6 +72,11 @@ uint32_t Platform::currentDefaultGateway()
 void Platform::macAddress(uint8_t *data)
 {}
 
+uint32_t Platform::uniqueSerialNumber()
+{
+    return 0x01020304;
+}
+
 void Platform::setupMultiCast(uint32_t addr, uint16_t port)
 {}
 

src/knx/platform.h

@@ -20,6 +20,9 @@ class Platform
     virtual uint32_t currentDefaultGateway();
     virtual void macAddress(uint8_t* data);
 
+    // unique serial number
+    virtual uint32_t uniqueSerialNumber();
+
     // basic stuff
     virtual void restart() = 0;
     virtual void fatalError() = 0;

src/knx_facade.h

@@ -49,18 +49,21 @@ template <class P, class B> class KnxFacade : private SaveRestore
     KnxFacade() : _platformPtr(new P()), _bauPtr(new B(*_platformPtr)), _bau(*_bauPtr)
     {
         manufacturerId(0xfa);
+        bauNumber(platform().uniqueSerialNumber());
         _bau.addSaveRestore(this);
     }
 
     KnxFacade(B& bau) : _bau(bau)
     {
         manufacturerId(0xfa);
+        bauNumber(platform().uniqueSerialNumber());
         _bau.addSaveRestore(this);
     }
 
     KnxFacade(IsrFunctionPtr buttonISRFunction) : _platformPtr(new P()), _bauPtr(new B(*_platformPtr)), _bau(*_bauPtr)
     {
         manufacturerId(0xfa);
+        bauNumber(platform().uniqueSerialNumber());
         _bau.addSaveRestore(this);
         setButtonISRFunction(buttonISRFunction);
     }

src/samd_platform.cpp

@@ -17,6 +17,30 @@ SamdPlatform::SamdPlatform( HardwareSerial* s) : ArduinoPlatform(s)
 {
 }
 
+uint32_t SamdPlatform::uniqueSerialNumber()
+{
+    #if defined (__SAMD51__)
+      // SAMD51 from section 9.6 of the datasheet
+      #define SERIAL_NUMBER_WORD_0	*(volatile uint32_t*)(0x008061FC)
+      #define SERIAL_NUMBER_WORD_1	*(volatile uint32_t*)(0x00806010)
+      #define SERIAL_NUMBER_WORD_2	*(volatile uint32_t*)(0x00806014)
+      #define SERIAL_NUMBER_WORD_3	*(volatile uint32_t*)(0x00806018)
+    #else
+    //#elif defined (__SAMD21E17A__) || defined(__SAMD21G18A__)  || defined(__SAMD21E18A__) || defined(__SAMD21J18A__)
+    // SAMD21 from section 9.3.3 of the datasheet
+      #define SERIAL_NUMBER_WORD_0	*(volatile uint32_t*)(0x0080A00C)
+      #define SERIAL_NUMBER_WORD_1	*(volatile uint32_t*)(0x0080A040)
+      #define SERIAL_NUMBER_WORD_2	*(volatile uint32_t*)(0x0080A044)
+      #define SERIAL_NUMBER_WORD_3	*(volatile uint32_t*)(0x0080A048)
+    #endif
+
+    uint32_t uniqueId = SERIAL_NUMBER_WORD_0 ^ SERIAL_NUMBER_WORD_1 ^ SERIAL_NUMBER_WORD_2 ^ SERIAL_NUMBER_WORD_3;
+
+    printf("uniqueSerialNumber: %0X\n", uniqueId);
+
+    return uniqueId;
+}
+
 void SamdPlatform::restart()
 {
     println("restart");

src/samd_platform.h

@@ -10,6 +10,9 @@ public:
     SamdPlatform();
     SamdPlatform( HardwareSerial* s);
 
+    // unique serial number
+    uint32_t uniqueSerialNumber() override;
+
     void restart();
     uint8_t* getEepromBuffer(uint16_t size);
     void commitToEeprom();

src/stm32_platform.cpp

@@ -20,6 +20,15 @@ Stm32Platform::~Stm32Platform()
     delete [] _eepromPtr;
 }
 
+uint32_t Stm32Platform::uniqueSerialNumber()
+{
+    uint32_t uniqueId = HAL_GetUIDw0() ^ HAL_GetUIDw1() ^ HAL_GetUIDw2();
+
+    printf("uniqueSerialNumber: %0X", uniqueId);
+
+    return uniqueId;
+}
+
 void Stm32Platform::restart()
 {
     NVIC_SystemReset();

src/stm32_platform.h

@@ -8,6 +8,9 @@ public:
     Stm32Platform( HardwareSerial* s);
     ~Stm32Platform();
 
+    // unique serial number
+    uint32_t uniqueSerialNumber() override;
+
     // basic stuff
     void restart();