Moved macros from twi.h to twi.cpp.

Placed TWI states in enum TWI_STATE : uint8_t.

Author: dac1e

libraries/Wire/src/utility/twi.cpp

@@ -41,7 +41,17 @@
 #include "pins_arduino.h"
 #include "twi.h"
 
-static volatile uint8_t twi_state;
+constexpr uint32_t TWI_FREQ = 100000L;
+
+enum TWI_STATE : uint8_t {
+  TWI_READY = 0,
+  TWI_MRX   = 1,
+  TWI_MTX   = 2,
+  TWI_SRX   = 3,
+  TWI_STX   = 4,
+};
+
+static volatile TWI_STATE twi_state;
 static volatile uint8_t twi_slarw;
 static volatile uint8_t twi_sendStop;			// should the transaction end with a stop
 static volatile uint8_t twi_inRepStart;			// in the middle of a repeated start

libraries/Wire/src/utility/twi.h

@@ -27,17 +27,6 @@
   #include <inttypes.h>
   //#define ATMEGA8
 
-  #ifndef TWI_FREQ
-  #define TWI_FREQ 100000L
-  #endif
-
-  #define TWI_READY 0
-  #define TWI_MRX   1
-  #define TWI_MTX   2
-  #define TWI_SRX   3
-  #define TWI_STX   4
-
-
   void twi_init(void);
   void twi_disable(void);
   void twi_setAddress(uint8_t);