Add ADC resolution options

Adafruit_INA219.cpp

@@ -290,6 +290,45 @@ void Adafruit_INA219::powerSave(bool on) {
   }
 }
 
+/*!
+ *  @brief  Set Bus ADC resolution and averaging options
+ *  @param  resolution
+ *          resolution option enum
+ */
+void Adafruit_INA219::setBusADCResolution(uint16_t resolution) {
+  // See the INA219_CONFIG_BADCRES enums for the various options
+  // The default set by setCalibration functions is NA219_CONFIG_BADCRES_12BIT
+
+  Adafruit_BusIO_Register config_reg =
+      Adafruit_BusIO_Register(i2c_dev, INA219_REG_CONFIG, 2, MSBFIRST);
+
+  uint32_t val = config_reg.read();
+  // Mask off area and set our new values
+  val &= ~INA219_CONFIG_BADCRES_MASK;
+  val |= resolution;
+  _success = config_reg.write(val, 2);
+}
+
+/*!
+ *  @brief  Set Shunt ADC resolution and averaging options
+ *  @param  resolution
+ *          resolution option enum
+ */
+void Adafruit_INA219::setShuntADCResolution(uint16_t resolution) {
+  // See the INA219_CONFIG_SADCRES enums for the various options
+  // The default set by setCalibration functions is
+  // INA219_CONFIG_SADCRES_12BIT_1S_532US
+
+  Adafruit_BusIO_Register config_reg =
+      Adafruit_BusIO_Register(i2c_dev, INA219_REG_CONFIG, 2, MSBFIRST);
+
+  uint32_t val = config_reg.read();
+  // Mask off area and set our new values
+  val &= ~INA219_CONFIG_SADCRES_MASK;
+  val |= resolution;
+  _success = config_reg.write(val, 2);
+}
+
 /*!
  *  @brief  Configures to INA219 to be able to measure up to 32V and 1A
  *          of current.  Each unit of current corresponds to 40uA, and each

Adafruit_INA219.h

@@ -174,6 +174,8 @@ class Adafruit_INA219 {
   float getCurrent_mA();
   float getPower_mW();
   void powerSave(bool on);
+  void setBusADCResolution(uint16_t resolution);
+  void setShuntADCResolution(uint16_t resolution);
   bool success();
 
 private: