-#define DACONTROL 0 // D/A CONTROL REGISTER
-#define SU 0000001 // Simultaneous update enabled
-#define NOSU 0000000 // Simultaneous update disabled
-#define ENABLEDAC 0000002 // Enable specified DAC
-#define DISABLEDAC 0000000 // Disable specified DAC
-#define RANGE2V5 0000000 // 2.5V
-#define RANGE5V 0000200 // 5V
-#define RANGE10V 0000300 // 10V
-#define UNIP 0000400 // Unipolar outputs
-#define BIP 0000000 // Bipolar outputs
-
-#define DACALIBRATION1 4 // D/A CALIBRATION REGISTER 1
-//write bits
-#define SERIAL_IN_BIT 0x1 // serial data input for eeprom, caldacs, reference dac
+#define DACONTROL 0 /* D/A CONTROL REGISTER */
+#define SU 0000001 /* Simultaneous update enabled */
+#define NOSU 0000000 /* Simultaneous update disabled */
+#define ENABLEDAC 0000002 /* Enable specified DAC */
+#define DISABLEDAC 0000000 /* Disable specified DAC */
+#define RANGE2V5 0000000 /* 2.5V */
+#define RANGE5V 0000200 /* 5V */
+#define RANGE10V 0000300 /* 10V */
+#define UNIP 0000400 /* Unipolar outputs */
+#define BIP 0000000 /* Bipolar outputs */
+
+#define DACALIBRATION1 4 /* D/A CALIBRATION REGISTER 1 */
+/* write bits */
+#define SERIAL_IN_BIT 0x1 /* serial data input for eeprom, caldacs, reference dac */