Fix regression: Only write register address with no value.

src/107-Arduino-TSL2550.cpp

@@ -46,9 +46,9 @@ bool ArduinoTSL2550::begin(bool const use_extended)
   }
 
   if (use_extended)
-    _io.write(TSL2550::Register::WriteCommandExtendedRange, 0);
+    _io.write(TSL2550::Register::WriteCommandExtendedRange);
   else
-    _io.write(TSL2550::Register::WriteCommandStandardRange, 0);
+    _io.write(TSL2550::Register::WriteCommandStandardRange);
 
   return true;
 }
@@ -82,7 +82,7 @@ float ArduinoTSL2550::get_lux()
 
 void ArduinoTSL2550::powerdown()
 {
-  _io.write(TSL2550::Register::PowerDownState, 0);
+  _io.write(TSL2550::Register::PowerDownState);
 }
 
 TSL2550::Error ArduinoTSL2550::error()

src/TSL2550/TSL2550_Io.cpp

@@ -34,6 +34,12 @@ TSL2550_Io::TSL2550_Io(I2cWriteFunc write, I2cReadFunc read, uint8_t const i2c_s
  * PUBLIC MEMBER FUNCTIONS
  **************************************************************************************/
 
+void TSL2550_Io::write(Register const reg)
+{
+  uint8_t const val=0;
+  write(reg, &val, 0);
+}
+
 uint8_t TSL2550_Io::read(Register const reg)
 {
   uint8_t data = 0;

src/TSL2550/TSL2550_Io.h

@@ -43,6 +43,7 @@ class TSL2550_Io
   TSL2550_Io(I2cWriteFunc write, I2cReadFunc read, uint8_t const i2c_slave_addr);
 
 
+  void    write(Register const reg);
   uint8_t read (Register const reg);
   void    write(Register const reg, uint8_t const val);
   void    read (Register const reg, uint8_t * buf, size_t const bytes);