diff --git a/DSTAT-temp/src/experiment.c b/DSTAT-temp/src/experiment.c
index 87344442801786deecc5afadfcfb587a9740595f..5996432507244af007bc075a68283f2d9c4ce6f9 100644
--- a/DSTAT-temp/src/experiment.c
+++ b/DSTAT-temp/src/experiment.c
@@ -34,6 +34,7 @@ volatile uint16_t tcf0period = 0;
 uint32_t skip_samples = 0;
 
 //Private function declarations
+uint16_t set_timer_period(uint32_t period, volatile void *tc);
 static void precond_rtc_callback(uint32_t time);
 static void porte_int0_lsv(void);
 static void tcf0_ovf_callback(void);
@@ -52,29 +53,6 @@ typedef void (*port_callback_t) (void);
 static port_callback_t portd_int0_callback;
 static port_callback_t portd_int1_callback;
 
-void send_data_uint16(uint16_t data){
-	/**
-	 * Sends uint16 data over USB in order in memory (should be LSB first for AVR - little endian)
-	 *
-	 * @param data 16-bit data
-	 * @return Nothing.
-	 */
-	udi_cdc_putc(((unsigned char *)(&data))[0]);
-	udi_cdc_putc(((unsigned char *)(&data))[1]);
-}
-void send_data_int32(int32_t data){
-	/**
-	 * Sends int32 data over USB in order in memory (should be LSB first for AVR - little endian)
-	 *
-	 * @param data 32-bit data
-	 * @return Nothing.
-	 */
-	udi_cdc_putc(((unsigned char *)(&data))[0]);
-	udi_cdc_putc(((unsigned char *)(&data))[1]);
-	udi_cdc_putc(((unsigned char *)(&data))[2]);
-	udi_cdc_putc(((unsigned char *)(&data))[3]);
-}
-
 uint16_t set_timer_period(uint32_t period, volatile void *tc)
 {
 	/**
@@ -595,14 +573,20 @@ static void porte_int0_lsv(void){
 	/**
 	 * ISR for taking LSV measurements.
 	 */
+	struct
+	{
+		uint16_t index;
+		int32_t result;
+	} data;
 	
- 	int32_t result = ads1255_read_fast24();
+ 	data.result = ads1255_read_fast24();
 
 	static uint16_t last_value = 0;
 	uint32_t current = TCC1.CNT;
+	data.index = (current+last_value)>>1; //DAC value is average of current and last timer - approximation of center of averaging window
+	
 	printf("B\n");
-	send_data_uint16((current+last_value)>>1); //DAC value is average of current and last timer - approximation of center of averaging window
-	send_data_int32(result); 
+	udi_cdc_write_buf(&data, 6);
 	last_value = (uint16_t)current;
 	printf("\n");
 	
@@ -766,11 +750,19 @@ void ca_experiment(uint16_t steps, uint16_t step_dac[], uint16_t step_seconds[])
 }
 
 static void portd_int0_ca(void){
-	int32_t data = ads1255_read_fast24();
+	struct
+	{
+		uint16_t time1;
+		uint16_t time2;
+		int32_t current;
+	} data;
+	
+	data.time1 = TCC0.CNT;
+	data.time2 = RTC.CNT;
+	data.current = ads1255_read_fast24();
+
 	printf("B\n");
-	send_data_uint16(TCC0.CNT);
-	send_data_uint16(RTC.CNT);
-	send_data_int32(data);
+	udi_cdc_write_buf(&data, 8);
 	printf("\n");
 }
 
@@ -932,10 +924,19 @@ uint8_t _swv_singledir (uint16_t dacindex, uint16_t dacindex_stop, uint16_t daci
 		}
 			
 		//data output
+		struct
+		{
+			uint16_t lastindex;
+			int32_t forward;
+			int32_t	reverse;
+		} data;
+		
+		data.lastindex = lastindex;
+		data.forward = forward;
+		data.reverse = reverse;
+		
 		printf("B\n");
-		send_data_uint16(lastindex);
-		send_data_int32(forward);
-		send_data_int32(reverse);
+		udi_cdc_write_buf(&data, 10);
 		printf("\n");
 	}
 	
@@ -1080,10 +1081,19 @@ uint8_t _dpv_singledir (uint16_t dacindex, uint16_t dacindex_stop, uint16_t daci
 		}
 			
 		//data output
+		struct
+		{
+			uint16_t lastindex;
+			int32_t forward;
+			int32_t	reverse;
+		} data;
+		
+		data.lastindex = lastindex;
+		data.forward = forward;
+		data.reverse = reverse;
+		
 		printf("B\n");
-		send_data_uint16(lastindex);
-		send_data_int32(forward);
-		send_data_int32(reverse);
+		udi_cdc_write_buf(&data, 10);
 		printf("\n");
 	}
 	
diff --git a/DSTAT-temp/src/experiment.h b/DSTAT-temp/src/experiment.h
index 8b1ab536fe44ad9f463583f0c3f33f49d8889cf9..6597f120bc597b89ba4f937bd4ebf0a4916a64c9 100644
--- a/DSTAT-temp/src/experiment.h
+++ b/DSTAT-temp/src/experiment.h
@@ -75,9 +75,6 @@
 extern uint16_t g_gain;
 extern uint8_t autogain_enable;
 
-void send_data_uint16(uint16_t data);
-void send_data_int32(int32_t data);
-uint16_t set_timer_period(uint32_t period, volatile void *tc);
 void pot_init(void);
 void pot_set_gain(void);
 void volt_exp_start(void);
diff --git a/DSTAT1.atsuo b/DSTAT1.atsuo
index c409dd7e0b88439dfd9d1cdd2b17f4b8fcedb73f..dfef140a11114d069f60d9ca34d5957f7bf3edfd 100644
Binary files a/DSTAT1.atsuo and b/DSTAT1.atsuo differ