HDC2022: Energia Example code

Dear Hans - 

In Energia and Ardunio - it has been my experience that you need to convert the hex to decimal value when using Wire.h. 

for example, for address 0x41, use decimal see snippet of MID read and complete conversion cycle below to leverage for yourself. 

Wire.beginTransmission(65); // transmit to HDC2 device address 0x41
Wire.write(252); // pointer to 0xFC
Wire.endTransmission(); // stop transmitting

Wire.requestFrom(65, 2, 1); // request 4 bytes from HDC2 device, starting with register 0xFC (MID, low byte)

while (Wire.available())
{
Wire.readBytes(iBuff_HDC2, 2);
HDC2_MID_MSB = iBuff_HDC2[1] << 8; // shift left
HDC2_MID = (HDC2_MID_MSB + iBuff_HDC2080[0]);

Serial.print(", ");
Serial.println(HDC2_MID); // print out MID to terminal

}

// START_CONVERSION
/*
0x01 – 14 bit, 0x03 – temp only
0x51 – 11 bit, 0x53 – temp only
0xA1 – 9 bit , 0xA3 – temp only
*/
Wire.beginTransmission(65); // transmit to HDC2 device address 0x41
Wire.write(15); // pointer to 0x0F
Wire.write(01); // 14 bit for both T and %RH
Wire.endTransmission(); // stop transmitting

delayMicroseconds(1500); // min delay for 14 bit conversion

Wire.beginTransmission(65); // transmit to HDC2 device address 0x41
Wire.write(00); // pointer to 0x00
Wire.endTransmission(); // stop transmitting
Wire.requestFrom(65, 4, 1); // request 4 bytes from HDC2 device, starting with register 0x00 (temp MSB)

//get bytes, shift up temp MSB, do math on temp data, print results, shift up hum MSB, do math on hum data, print results
while (Wire.available())
{
Wire.readBytes(iBuff_HDC2, 4);
HDC2_temp_MSB = (iBuff_HDC2[1] << 8);
// HDC2_temp_LSB = (iBuff_HDC2[0]);
HDC2_temp_DEC = (HDC2_temp_MSB + iBuff_HDC2[0]); // get value for calculation, made from iBuff index array values 0 and 1 for temp reading.

HDC2_temp_celcius = ((float)(HDC2_temp_DEC) / 65536) * 165 - 40.00; // do math according to the HDC2010, HDC2021 and HDC2022 datasheets
//HDC2_temp_celcius = ((float)(HDC2_temp_DEC) / 65536) * 165 - 40.62; // do math according to the HDC2080 datasheet
HDC2_temp_celcius_comp = HDC2_temp_celcius;
Serial.print(", ");
Serial.print(HDC2_temp_celcius); // print out T to terminal
Serial.print(", ");

HDC2_hum_MSB = (iBuff_HDC2[3] << 8);
HDC2_hum_LSB = (iBuff_HDC2[2]);
HDC2_hum_DEC = (HDC2_hum_MSB + HDC2_hum_LSB); // get value for calculation, made from iBuff index array values 3 and 2 for humidity reading.
HDC2_hum_percentage = ((float)(HDC2_hum_DEC) / 65536) * 100; // do math according to the HDC2 datasheet
HDC2_hum_percentage_comp = HDC2_hum_percentage;
Serial.print(" ");
Serial.print(HDC2_hum_percentage); // print out %RH to terminal
Serial.println(",");

}