si7020 Interface sketch for energia

si7020.ino

#include "Energia.h"
#include "I2C_SoftwareLibrary.h"
#define LED RED_LED

#define SCL_PIN P2_6 ///< pin for SCL
#define SDA_PIN P2_7 ///< pin for SDA
SoftwareWire Wire(SDA_PIN, SCL_PIN); 

#define _address 0x40
uint8_t id[8];
uint8_t crc[8];

uint8_t led_state = 0;

void setup(void) {
  pinMode(RED_LED, OUTPUT);     
  pinMode(GREEN_LED, OUTPUT);
  digitalWrite(GREEN_LED, HIGH);
  digitalWrite(RED_LED, HIGH);
    
    
  
  Serial.begin(9600);
  Serial.println("*** START");
  Wire.begin();
  
  Wire.begin();
  Wire.beginTransmission(_address);
  Wire.write(0xFA);
  Wire.write(0x0F);
  Wire.endTransmission(false);
  Wire.requestFrom(_address, 8);
  while (Wire.available() < 2);
  id[4] = Wire.read();
  crc[4] = Wire.read();
  id[5] = Wire.read();
  crc[5] = Wire.read();
  id[6] = Wire.read();
  crc[6] = Wire.read();
  id[7] = Wire.read();
  crc[7] = Wire.read();
  
  Wire.begin();
  Wire.beginTransmission(_address);
  Wire.write(0xFC);
  Wire.write(0xC9);
  Wire.endTransmission(false);
  Wire.requestFrom(_address, 4);
  while (Wire.available() < 2);
  id[0] = Wire.read();
  crc[0] = Wire.read();
  id[1] = Wire.read();
  crc[1] = Wire.read();
  id[2] = Wire.read();
  crc[2] = Wire.read();
  id[3] = Wire.read();
  crc[3] = Wire.read();
   
}

void loop(void)
{
  Wire.beginTransmission(_address);
  Wire.write(0xE5);
  Wire.endTransmission(false);
  Wire.requestFrom(_address, 2);
  while (Wire.available() < 2);
  uint16_t rhMS = Wire.read();
  uint16_t rhLS = Wire.read();
  
  Wire.beginTransmission(_address);
  Wire.write(0xE0);
  Wire.endTransmission(false);
  Wire.requestFrom(_address, 2);
  while (Wire.available() < 2);
  uint16_t MS = Wire.read();
  uint16_t LS = Wire.read();
  
  float t = (MS<<8)+LS;
  float rh = (rhMS<<8)+rhLS;

  t=((175.72*t)/65536-46.85)*9/5+32;
  rh = (125*rh)/65536-6;
  
  
  Serial.print("uid: ");
  Serial.print(id[0],HEX);
  Serial.print(id[1],HEX);
  Serial.print(id[2],HEX);
  Serial.print(id[3],HEX);
  Serial.print(id[4],HEX);
  Serial.print(id[5],HEX);
  Serial.print(id[6],HEX);
  Serial.print(id[7],HEX);
  Serial.println("");
  
  Serial.print("t:");
  Serial.print(t,2);
  Serial.print(", rh:");
  Serial.println(rh,2);
  delay(1000);               // wait for a second
}