Merge pull request #45 from FlavorJ/add-success

Success!

Adafruit_INA219.cpp

@@ -72,7 +72,7 @@ int16_t Adafruit_INA219::getBusVoltage_raw() {
 
   Adafruit_BusIO_Register bus_voltage_reg =
       Adafruit_BusIO_Register(i2c_dev, INA219_REG_BUSVOLTAGE, 2, MSBFIRST);
-  bus_voltage_reg.read(&value);
+  _success = bus_voltage_reg.read(&value);
 
   // Shift to the right 3 to drop CNVR and OVF and multiply by LSB
   return (int16_t)((value >> 3) * 4);
@@ -86,7 +86,7 @@ int16_t Adafruit_INA219::getShuntVoltage_raw() {
   uint16_t value;
   Adafruit_BusIO_Register shunt_voltage_reg =
       Adafruit_BusIO_Register(i2c_dev, INA219_REG_SHUNTVOLTAGE, 2, MSBFIRST);
-  shunt_voltage_reg.read(&value);
+  _success = shunt_voltage_reg.read(&value);
   return value;
 }
 
@@ -108,7 +108,7 @@ int16_t Adafruit_INA219::getCurrent_raw() {
   // Now we can safely read the CURRENT register!
   Adafruit_BusIO_Register current_reg =
       Adafruit_BusIO_Register(i2c_dev, INA219_REG_CURRENT, 2, MSBFIRST);
-  current_reg.read(&value);
+  _success = current_reg.read(&value);
   return value;
 }
 
@@ -130,7 +130,7 @@ int16_t Adafruit_INA219::getPower_raw() {
   // Now we can safely read the POWER register!
   Adafruit_BusIO_Register power_reg =
       Adafruit_BusIO_Register(i2c_dev, INA219_REG_POWER, 2, MSBFIRST);
-  power_reg.read(&value);
+  _success = power_reg.read(&value);
   return value;
 }
 
@@ -262,7 +262,7 @@ void Adafruit_INA219::setCalibration_32V_2A() {
                     INA219_CONFIG_MODE_SANDBVOLT_CONTINUOUS;
   Adafruit_BusIO_Register config_reg =
       Adafruit_BusIO_Register(i2c_dev, INA219_REG_CONFIG, 2, MSBFIRST);
-  config_reg.write(config, 2);
+  _success = config_reg.write(config, 2);
 }
 
 /*!
@@ -277,9 +277,9 @@ void Adafruit_INA219::powerSave(bool on) {
   Adafruit_BusIO_RegisterBits mode_bits =
       Adafruit_BusIO_RegisterBits(&config_reg, 3, 0);
   if (on) {
-    mode_bits.write(INA219_CONFIG_MODE_POWERDOWN);
+    _success = mode_bits.write(INA219_CONFIG_MODE_POWERDOWN);
   } else {
-    mode_bits.write(INA219_CONFIG_MODE_SANDBVOLT_CONTINUOUS);
+    _success = mode_bits.write(INA219_CONFIG_MODE_SANDBVOLT_CONTINUOUS);
   }
 }
 
@@ -373,7 +373,7 @@ void Adafruit_INA219::setCalibration_32V_1A() {
                     INA219_CONFIG_MODE_SANDBVOLT_CONTINUOUS;
   Adafruit_BusIO_Register config_reg =
       Adafruit_BusIO_Register(i2c_dev, INA219_REG_CONFIG, 2, MSBFIRST);
-  config_reg.write(config, 2);
+  _success = config_reg.write(config, 2);
 }
 
 /*!
@@ -465,5 +465,15 @@ void Adafruit_INA219::setCalibration_16V_400mA() {
 
   Adafruit_BusIO_Register config_reg =
       Adafruit_BusIO_Register(i2c_dev, INA219_REG_CONFIG, 2, MSBFIRST);
-  config_reg.write(config, 2);
+  _success = config_reg.write(config, 2);
 }
+
+/*!
+ *  @brief  Provides the the underlying return value from the last operation
+ *          called on the device.
+ *  @return true: Last operation was successful false: Last operation failed
+ *  @note   For function calls that have intermediary device operations,
+ *          e.g. calibration before read/write, only the final operation's
+ *          result is stored.
+ */
+bool Adafruit_INA219::success() { return _success; }

Adafruit_INA219.h

@@ -158,10 +158,13 @@ class Adafruit_INA219 {
   float getCurrent_mA();
   float getPower_mW();
   void powerSave(bool on);
+  bool success();
 
 private:
   Adafruit_I2CDevice *i2c_dev = NULL;
 
+  bool _success;
+
   uint8_t ina219_i2caddr = -1;
   uint32_t ina219_calValue;
   // The following multipliers are used to convert raw current and power