diff --git a/src/ad5933.c b/src/ad5933.c
index 5ce592206448e6973017f1c2b3596611b40e220e..d51761d6ae172dfbad4a0620f5c07f8a1aaec5f5 100644
--- a/src/ad5933.c
+++ b/src/ad5933.c
@@ -14,9 +14,10 @@
 #include <sysclk.h>
 #include <delay.h>
 #include "settings.h"
-#include "config/conf_board.h"
+#include "config/dstat_config.h"
+
+#define EIS_TWI     EXT_TWI0
 
-#define EIS_TWI         TWIC
 #define AD5933_ADDR     0x0D
 #define ADDR_PTR        0xB0
 // Control Register
@@ -103,34 +104,21 @@
 #define INTERNAL_CLK_HZ 16776000
 
 
-uint8_t read_byte(uint8_t address);
-void read_block(uint8_t address, uint8_t length, uint8_t* buffer);
-void write_byte(uint8_t address, uint8_t value);
-void write_block(uint8_t address, uint8_t length, uint8_t* buffer);
-void reset(void);
-void internal_clock_set(bool);
-bool set_start_frequency(uint32_t);
-bool set_increment_frequency(uint32_t);
-bool set_num_increments(uint16_t);
-bool set_settling_cycles(uint16_t cycles);
-void set_gain(uint8_t pga_gain, uint8_t o_range);
-void set_control_mode(uint8_t);
-
-
-
-void eis_init(void){
-    ioport_set_port_mode(IOPORT_PORTC, PIN0_bm|PIN1_bm, IOPORT_MODE_WIREDANDPULL);
-    sysclk_enable_peripheral_clock(&EIS_TWI);
-    twi_master_enable(&EIS_TWI);
-    twi_master_options_t opt = {
-        .speed = 50000,
-        .chip  = 0x42
-    };
-    twi_master_setup(&EIS_TWI, &opt);
-    printf("#INFO: TWI master enabled\n\r");
-}
+static uint8_t read_byte(uint8_t address);
+static void read_block(uint8_t address, uint8_t length, uint8_t* buffer);
+static void write_byte(uint8_t address, uint8_t value);
+static void write_block(uint8_t address, uint8_t length, uint8_t* buffer);
+static void reset(void);
+static void internal_clock_set(bool);
+static bool set_start_frequency(uint32_t);
+static bool set_increment_frequency(uint32_t);
+static bool set_num_increments(uint16_t);
+static bool set_settling_cycles(uint16_t cycles);
+static void set_gain(uint8_t pga_gain, uint8_t o_range);
+static void set_control_mode(uint8_t);
 
-uint8_t read_byte(uint8_t address) {
+
+static uint8_t read_byte(uint8_t address) {
     /**
      * Reads one byte from AD5933
      *
@@ -150,11 +138,9 @@ uint8_t read_byte(uint8_t address) {
     
     twi_master_read(&EIS_TWI, &twi_pack);
     return value;
-    read_block(address, 1, &value);
-    return value;
 }
 
-void read_block(uint8_t address, uint8_t length, uint8_t* buffer) {
+static void read_block(uint8_t address, uint8_t length, uint8_t* buffer) {
     /**
      * Reads a block of data
      *
@@ -185,7 +171,7 @@ void read_block(uint8_t address, uint8_t length, uint8_t* buffer) {
 }
 
 
-void write_byte(uint8_t address, uint8_t value) {
+static void write_byte(uint8_t address, uint8_t value) {
     /**
      * Writes one byte to AD5933.
      *
@@ -206,7 +192,7 @@ void write_byte(uint8_t address, uint8_t value) {
         printf("#ERR: AD5933 TWI write fail\r\n");
 }
 
-void write_block(uint8_t address, uint8_t length, uint8_t* buffer) {
+static void write_block(uint8_t address, uint8_t length, uint8_t* buffer) {
     /**
      * Writes a block of data
      *
@@ -261,12 +247,12 @@ void ad5933_set_params(uint32_t start, uint32_t increment, uint16_t n_increments
 }
 
 
-void reset(void) {
+static void reset(void) {
     uint8_t current = read_byte(CTRL_REG2);
     write_byte(CTRL_REG2, current | CTRL_RESET);
 }
 
-void internal_clock_set(bool internal) {
+static void internal_clock_set(bool internal) {
     //set the control register to internal or external clock
     uint8_t current = read_byte(CTRL_REG2);
     
@@ -278,7 +264,7 @@ void internal_clock_set(bool internal) {
     write_byte(CTRL_REG2, current);
 }
 
-void test(uint32_t freq){
+void ad5933_test(void){
     ad5933_set_params(0x0f5c28, 0x14f, 10, 100, 1);
     
     cuint16_t result[10];
@@ -289,7 +275,7 @@ void test(uint32_t freq){
     }
 }
 
-bool set_start_frequency(uint32_t start) {
+static bool set_start_frequency(uint32_t start) {
     if (start > 0xFFFFFF) {
         printf("#ERR: AD5933: Start frequency too high.\r\n");
         return false;
@@ -301,7 +287,7 @@ bool set_start_frequency(uint32_t start) {
     return true;
 }
 
-bool set_increment_frequency(uint32_t increment) {
+static bool set_increment_frequency(uint32_t increment) {
     if (increment > 0xFFFFFF) {
         printf("#ERR: AD5933: Increment too high.\r\n");
         return false;
@@ -313,7 +299,7 @@ bool set_increment_frequency(uint32_t increment) {
     return true;
 }
 
-bool set_num_increments(uint16_t num) {
+static bool set_num_increments(uint16_t num) {
     if (num > 511){
         printf("#ERR: AD5933: Increment number too high.\r\n");
         return false;
@@ -325,7 +311,7 @@ bool set_num_increments(uint16_t num) {
     return true;
 }
 
-bool set_settling_cycles(uint16_t cycles) {
+static bool set_settling_cycles(uint16_t cycles) {
     uint16_t output = 0;
     
     if (cycles <= 0x1ff) {
@@ -347,7 +333,7 @@ bool set_settling_cycles(uint16_t cycles) {
     return true;
 }
 
-void set_gain(uint8_t pga_gain, uint8_t o_range) {
+static void set_gain(uint8_t pga_gain, uint8_t o_range) {
     uint8_t val = 0;
     
     switch (pga_gain) {
@@ -384,7 +370,7 @@ void set_gain(uint8_t pga_gain, uint8_t o_range) {
     return;
 }
 
-void set_control_mode(uint8_t mode) {
+static void set_control_mode(uint8_t mode) {
     uint8_t val = read_byte(CTRL_REG1);
     
     val &= 0b00001111;  // clear out the top 4 bits
diff --git a/src/ad5933.h b/src/ad5933.h
index 96c96a9f8d70f22f74df6cf3df8bda531a06e799..f1aa7fe39eb21534ffd631f652dc60e8e574f0b3 100644
--- a/src/ad5933.h
+++ b/src/ad5933.h
@@ -18,12 +18,11 @@ typedef struct c_uint16_t {
     uint16_t imag;
 } cuint16_t;
 
-void eis_init(void);
 void ad5933_set_params(uint32_t start, uint32_t increment, uint16_t n_increments,
                         uint16_t settle_cycles, uint8_t gain);
 void ad5933_sweep(cuint16_t imp[], int n);
 cuint16_t ad5993_get_complex_data(void);
 
-void test(uint32_t freq);
+void ad5933_test(void);
 
 #endif /* ad5933_h */