diff --git a/prosjekt.X/header.h b/prosjekt.X/header.h
index 9cfe156..4789bf9 100644
--- a/prosjekt.X/header.h
+++ b/prosjekt.X/header.h
@@ -44,81 +44,28 @@
 
 #include <xc.h> // include processor files - each processor file is guarded.  
 
+
+#ifdef	__cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+    // TODO If C++ is being used, regular C code needs function names to have C 
+    // linkage so the functions can be used by the c code. 
+
+#ifdef	__cplusplus
+}
+#endif /* __cplusplus */
+
+#endif	/* XC_HEADER_TEMPLATE_H */
+
+
+void USART3_init(void);
+void USART3_sendChar(char c);
+void USART3_sendString(char *str);
+static int USART3_printChar(char c, FILE *stream);
 uint16_t adcVal;
-
-void led_init(void)
-{	
-	/* Disable digital input buffer */
-	PORTC.PIN6CTRL &= ~PORT_ISC_gm;
-	PORTC.PIN6CTRL |= PORT_ISC_INPUT_DISABLE_gc;
-	/* Disable pull-up resistor */
-	PORTC.PIN6CTRL &= ~PORT_PULLUPEN_bm;
-	PORTE.DIRSET = PIN0_bm;
-	PORTE.DIRSET = PIN1_bm;
-	PORTE.DIRSET = PIN2_bm;
-	
-}
-
-void USART3_init(void)
-{
-	PORTB.DIRCLR &= ~PIN1_bm;
-	PORTB.DIRSET |= PIN0_bm;
-	PORTB.DIRCLR = PIN2_bm;
-	PORTB.PIN2CTRL |= PORT_PULLUPEN_bm;
-	USART3.CTRLB |= USART_RXEN_bm | USART_TXEN_bm; /* Enable both TX and
-	RX */
-	USART3.BAUD = USART3_BAUD_RATE (9600); /* Setting the baudrate */
-}
-
-void ADC0_init(void)
-{
-	
-	ADC0.CTRLC = ADC_PRESC_DIV4_gc;
-	VREF.ADC0REF = VREF_REFSEL_VDD_gc; /* Internal reference */
-	ADC0.CTRLA = ADC_ENABLE_bm /* ADC Enable: enabled */
-	| ADC_RESSEL_10BIT_gc; /* 10-bit mode */
-	/* Select ADC channel */
-	ADC0.MUXPOS = ADC_MUXPOS_AIN6_gc;
-}
-
-void USART3_sendChar(char c)
-{
-	while (!(USART3.STATUS & USART_DREIF_bm))
-	{
-		;
-	}
-	USART3.TXDATAL = c;
-}
-
-void USART3_sendString(char *str)
-{
-	for(size_t i = 0; i < strlen(str); i++)
-	{
-		USART3_sendChar(str[i]);
-	}
-}
-
-static int USART3_printChar(char c, FILE *stream)
-{
-	USART3_sendChar(c);
-	return 0;
-}
-
-uint16_t ADC0_read(void)
-{
-	/* Start ADC conversion */
-	ADC0.COMMAND = ADC_STCONV_bm;
-	/* Wait until ADC conversion done */
-	while ( !(ADC0.INTFLAGS & ADC_RESRDY_bm) )
-	{
-		;
-	}
-	/* Clear the interrupt flag by writing 1: */
-	ADC0.INTFLAGS = ADC_RESRDY_bm;
-	return ADC0.RES;
-}
-
-bool ADC0_conersionDone(void)
-{
-	return (ADC0.INTFLAGS & ADC_RESRDY_bm);
-}
+void led_init(void);
+void ADC0_init(void);
+uint16_t ADC0_read();
+void ADC0_start(void);
+bool ADC0_conersionDone(void);
\ No newline at end of file