Started following some tutorial on att85 usi. Downloaded example code from make avr book.

Make AVR Examples/Chapter17_I2C/i2cThermometer/i2c.h

@@ -0,0 +1,22 @@
+// Functions for i2c communication
+#include <avr/io.h>
+#include "pinDefines.h"
+
+void initI2C(void);
+    /* Sets pullups and initializes bus speed to 100kHz (at FCPU=8MHz) */
+
+void i2cWaitForComplete(void);
+                       /* Waits until the hardware sets the TWINT flag */
+
+void i2cStart(void);
+                               /* Sends a start condition (sets TWSTA) */
+void i2cStop(void);
+                                /* Sends a stop condition (sets TWSTO) */
+
+void i2cSend(uint8_t data);
+                   /* Loads data, sends it out, waiting for completion */
+
+uint8_t i2cReadAck(void);
+              /* Read in from slave, sending ACK when done (sets TWEA) */
+uint8_t i2cReadNoAck(void);
+              /* Read in from slave, sending NOACK when done (no TWEA) */