Define constants for ADC multiplexer settings and describe I2C status flags

src/bus/i2c.h

@@ -8,6 +8,12 @@
 #define AHT02 0x1  // Middle
 #define AHT03 0x2  // Lower
 
+// ADC channels
+#define ADS01 0x0  // AIN0 GND
+#define ADS02 0x1  // AIN1 GND
+#define ADS03 0x2  // AIN2 GND
+#define ADS04 0x3  // AIN3 GND
+
 int   I2C_Init(void);
 int   I2C_Start(byte addr, byte mode);
 int   I2C_SetChannel(int channel);