1st step for M5 ENV3 iic module support

lib/iictask/SHT3X.cpp

@@ -0,0 +1,45 @@
+#include "SHT3X.h"
+
+bool SHT3X::init(uint8_t slave_addr_in, TwoWire* wire_in)
+{
+  _wire = wire_in;
+  _address=slave_addr_in;
+  return true;
+}
+
+byte SHT3X::get()
+{
+  unsigned int data[6];
+
+  // Start I2C Transmission
+  _wire->beginTransmission(_address);
+  // Send measurement command
+  _wire->write(0x2C);
+  _wire->write(0x06);
+  // Stop I2C transmission
+  if (_wire->endTransmission()!=0) 
+    return 1;  
+
+  delay(200);
+
+  // Request 6 bytes of data
+  _wire->requestFrom(_address, (uint8_t) 6);
+
+  // Read 6 bytes of data
+  // cTemp msb, cTemp lsb, cTemp crc, humidity msb, humidity lsb, humidity crc
+  for (int i=0;i<6;i++) {
+    data[i]=_wire->read();
+  };
+  
+  delay(50);
+  
+  if (_wire->available()!=0) 
+    return 2;
+
+  // Convert the data
+  cTemp = ((((data[0] * 256.0) + data[1]) * 175) / 65535.0) - 45;
+  fTemp = (cTemp * 1.8) + 32;
+  humidity = ((((data[3] * 256.0) + data[4]) * 100) / 65535.0);
+
+  return 0;
+}