add setchannel

Author: ladyada

Adafruit_NAU7802.cpp

@@ -147,6 +147,24 @@ bool Adafruit_NAU7802::available(void) {
   return conv_ready.read();
 }
 
+/**************************************************************************/
+/*!
+    @brief  Set which channel for ADC
+    @param channel Set to 0 for CH1, 1 for CH2
+    @returns False if any I2C error occured
+*/
+/**************************************************************************/
+bool Adafruit_NAU7802::setChannel(uint8_t channel) {
+  if (channel > 1)
+    channel = 1;
+
+  Adafruit_I2CRegister ctrl2_reg = Adafruit_I2CRegister(i2c_dev, NAU7802_CTRL2);
+  Adafruit_I2CRegisterBits ch_select =
+      Adafruit_I2CRegisterBits(&ctrl2_reg, 1, 7); // # bits, bit_shift
+
+  return ch_select.write(channel);
+}
+
 /**************************************************************************/
 /*!
     @brief Read the stored 24-bit ADC output value.

Adafruit_NAU7802.h

@@ -85,6 +85,7 @@ class Adafruit_NAU7802 {
   bool available(void);
   int32_t read(void);
 
+  bool setChannel(uint8_t channel);
   bool setLDO(NAU7802_LDOVoltage voltage);
   NAU7802_LDOVoltage getLDO(void);
   bool setGain(NAU7802_Gain gain);