Add begin function that takes I2C addr, and conditional compile for ESP32

Author: torntrousers

library.properties

@@ -6,5 +6,5 @@ sentence=Arduino Library for the Atmel/Microchip ECC508 and ECC608 crypto chips
 paragraph=
 category=Communication
 url=https://github.com/arduino-libraries/ArduinoECCX08
-architectures=samd,megaavr,mbed
+architectures=samd,megaavr,mbed,esp32
 includes=ArduinoECCX08.h

src/ECCX08.cpp

@@ -38,6 +38,12 @@ ECCX08Class::~ECCX08Class()
 {
 }
 
+int ECCX08Class::begin(uint8_t i2cAddress)
+{
+  _address = i2cAddress;
+  return begin();
+}
+
 int ECCX08Class::begin()
 {
   _wire->begin();
@@ -721,7 +727,11 @@ int ECCX08Class::receiveResponse(void* response, size_t length)
   size_t responseSize = length + 3; // 1 for length header, 2 for CRC
   byte responseBuffer[responseSize];
 
+#if (ESP32)
+  while (_wire->requestFrom((uint8_t)_address, (uint8_t)responseSize, (bool)true) != responseSize && retries--);
+#else
   while (_wire->requestFrom((uint8_t)_address, (size_t)responseSize, (bool)true) != responseSize && retries--);
+#endif
 
   responseBuffer[0] = _wire->read();
 

src/ECCX08.h

@@ -34,6 +34,7 @@ class ECCX08Class
   virtual ~ECCX08Class();
 
   int begin();
+  int begin(uint8_t i2cAddress);
   void end();
 
   int serialNumber(byte sn[]);