fix hangs due to HTS221 and speed upthe humidity readings

Author: Rocketct

src/MKRENV.cpp

@@ -87,7 +87,7 @@ int ENVClass::begin()
   readHTS221Calibration();
 
   // enable HTS221
-  i2cWrite(HTS221_ADDRESS, HTS221_CTRL1_REG, 0x80);
+  i2cWrite(HTS221_ADDRESS, HTS221_CTRL1_REG, 0x84);
 
   // configure VEML6075 for 100 ms
   i2cWriteWord(VEML6075_ADDRESS, VEML6075_UV_CONF_REG, 0x0010);
@@ -100,8 +100,6 @@ void ENVClass::end()
   // shutdown VEML6075
   i2cWriteWord(VEML6075_ADDRESS, VEML6075_UV_CONF_REG, 0x0001);
 
-  delay(80);
-
   // disable HTS221
   i2cWrite(HTS221_ADDRESS, HTS221_CTRL1_REG, 0x00);
 
@@ -117,7 +115,7 @@ float ENVClass::readTemperature(int units)
   i2cWrite(HTS221_ADDRESS, HTS221_CTRL2_REG, 0x01);
 
   // wait for completion
-  while ((i2cRead(HTS221_ADDRESS, HTS221_STATUS_REG) & 0x01) == 0) {
+  while ((i2cRead(HTS221_ADDRESS, HTS221_STATUS_REG) & 0x03) == 0) {
     yield();
   }
 
@@ -137,14 +135,14 @@ float ENVClass::readHumidity()
   i2cWrite(HTS221_ADDRESS, HTS221_CTRL2_REG, 0x01);
 
   // wait for completion
-  while ((i2cRead(HTS221_ADDRESS, HTS221_STATUS_REG) & 0x02) == 0) {
+  while ((i2cRead(HTS221_ADDRESS, HTS221_STATUS_REG) & 0x03) == 0) {
     yield();
   }
 
   // read value and convert
   int16_t hout = i2cRead16(HTS221_ADDRESS, HTS221_HUMIDITY_OUT_L_REG);
-
-  return (hout * _hts221HumiditySlope + _hts221HumidityZero);
+  float reading = hout * _hts221HumiditySlope + _hts221HumidityZero;
+  return reading;
 }
 
 float ENVClass::readPressure(int units)