Tested working.

Author: xcvista

README.md

@@ -7,14 +7,15 @@ Created & maintained by Max Chan.
 This driver interfaces the microcontroller with the Microchip MCP41xxx/42xxx
 digital potentiometers and MCP43xxx/44xxx digital rheostats.
 
-## Device numbering
+## Device addressing
 
 This driver supports a daisy-chained string of digi-pots sharing a single chip
 select line. Device 0 is the first pot on the chip closest to the MCU. Only
 MCP42xxx and MCP44xxx can daisy chain, but MCP41xxx and MCP43xxx can be at the
 end of a chain.
 
-When using a lone MCP41xxx/43xxx digi-pot, address device 0.
+When using a lone MCP41xxx/43xxx digi-pot, you can call `analogWrite` without
+the device address.
 
 ## Shutdown Mode
 

src/MCP41xxx.cpp

@@ -23,6 +23,11 @@ void MCP41xxx::begin(void)
     pinMode(_ss, OUTPUT);
 }
 
+void MCP41xxx::analogWrite(uint16_t value)
+{
+	analogWrite(0, value);
+}
+
 void MCP41xxx::analogWrite(uint8_t gate, uint16_t value)
 {
 

src/MCP41xxx.h

@@ -31,13 +31,22 @@ class MCP41xxx
      */
     void begin(void);
 
+	/*!
+	 Write a value to the DAC chip.
+
+	 @param value The DAC value. It is capped to 10 bits and excessive bits are
+	 ignored.
+	 */
+	void analogWrite(uint16_t value);
+
     /*!
      Write a value to the DAC chip.
      
+	 @param gate  The ID of the DAC.
      @param value The DAC value. It is capped to 10 bits and excessive bits are
      ignored.
      */
-    void analogWrite(uint8_t gate = 0, uint16_t value);
+    void analogWrite(uint8_t gate, uint16_t value);
 };
 
 #endif // !defined(_TLC5615_H_)