diff --git a/main.c b/main.c
index babc512..8f957d8 100644
--- a/main.c
+++ b/main.c
@@ -1,27 +1,16 @@
 #include<avr/io.h>
 #include "common.h"
 
-// XXX - ADF4350 LE
+// PB3 - ADF4350 LE
 // PB2 - SCK to ADF4350 CLK
 // PB1 - DO (MOSI) to ADF4350 DATA
-// XXX - ADF4350 LD
-
-String tosend="Test";
+// PB5 - ADF4350 LD
+// PB4 - Status LED
 
 void Delay(uint32_t);
 uint8_t SendReceiveSPIData(uint8_t);
 void SendSPIDataADF4350 (uint32_t);
 
-void spi_setup()
-{
-  // set direction of PB1 (DO) and PB2 (USCK) as output
-  DDRB=(1<<PB1)|(1<<PB2);
-
-  // set to three wire mode (SPI)
-  USICR=(1<<USIWM0);          
-  //USICR=(0<<USIWM1); not needed
-}
-
 int main()
 {
   // set instructions to configure the ADF4350 for a 1 GHz +5dBm output
@@ -40,7 +29,46 @@ int main()
 	//uint32_t ar4=0xac803c;
 	//uint32_t ar5=0x580005;
 
-  spi_setup();
+  // set direction of PB1 (DO) and PB2 (USCK) as output
+  DDRB=(1<<PB1)|(1<<PB2);
+
+  // set to three wire mode (SPI)
+  USICR=(1<<USIWM0);          
+  ///USICR=(0<<USIWM1); not needed, already 0
+
+  // set direction of PB4 (status LED) as output
+  DDRB |= (1 << PB4);
+
+	// set direction of PB3 (LE) as open-drain output
+	DDRB |= (1 << PB3);
+
+	// set PB3 (LE) low
+	PORTB &= ~(1 << PORTB3);
+
+	// set direction of PB5 (LD Input) as input
+  DDRB &= ~(1 << DDB5);
+
+	// enable pull-up resistor on PB5
+  PORTB |= (1 << PORTB5);
+
+	// flash the Status LED (PB4) to show that everything works
+	PORTB |= (1 << PORTB4);
+	Delay(500000);
+	PORTB &= ~(1 << PORTB4);
+	Delay(100000);
+
+	// go into an endless loop waiting for frequency lock to be achieved
+	while (1)
+	{
+			// read the state of LD (PB5)
+			uint8_t ldState = PINB & (1 << PINB5);
+
+			// if LD is low, turn on the LED (PB4)
+			if (ldState == 0)
+					PORTB |= (1 << PORTB4); // Turn on the LED
+			else
+					PORTB &= ~(1 << PORTB4); // Turn off the LED
+	}
 }
 
 // general purpose delay
@@ -59,7 +87,8 @@ uint8_t SendReceiveSPIData(uint8_t value)
 	uint8_t lout = 0;
   short int i=0;
   
-  for(i=0;i<=3;i++)
+  // prob change the 8 below to len of value?
+  for(i=0;i<8;i++)
   {
     USIDR=value[i];         // write data bytes in Data register, will cause them to get sent on clock
     while(USIOIF==0)        // check USI data counter overflow flag to detect the end of transmission every byte
@@ -69,21 +98,9 @@ uint8_t SendReceiveSPIData(uint8_t value)
     USISR|=(1<<USIOIF)      // clear USI data counter overflow flag
   }
 
-  // Read in a 16 bit frame (replace with proper reading response thing)
+  // Read in a 16 bit frame 
 	///uint16_t inbyte = *(uint32_t *)(SPI1_BASE + 0x0c);
-  while (lout == 0)
-  {
-    // do stuff to check response?
-    lout = 1;
-
-    // Read the SPI status register
-		///uint32_t statusSPI = *(uint32_t *)(SPI1_BASE + 0x08);
-		// Just bit 1 the transmit buffer empty flag - wait for this to go high then leave this function
-		/// &= BIT_1;
-		// The condition has been met so signal to get out of this loop
-		///if (statusSPI == BIT_1) lout = 1;
-  }
-	return inbyte;
+	//return inbyte;
 }
 
 // send a 32 bit register value to the ADF4350
@@ -100,23 +117,21 @@ void SendSPIDataADF4350 (uint32_t outval)
 	SendReceiveSPIData (byte2);
   SendReceiveSPIData (byte3);
   SendReceiveSPIData (byte4);
-	uint8_t lout = 0;
-	// Loop waiting for the the SPI BSY flag to go low
-	while (lout == 0)
-	{
-		// Read the SPI status register
-		uint32_t statusSPI = *(uint32_t *)(SPI1_BASE + 0x08);
-		// Just bit 7 the SPI BSY flag - wait for this to go low then leave this function
-		statusSPI &= BIT_7;
-		// The condition has been met so signal to get out of this loop
-		if (statusSPI == 0) lout = 1;
-	}
-	// Add a delay here so the clock has gone low before LE is taken high
+
+	// 2 x 16 version:
+	// split into 2 x 16 bit words
+  ///uint16_t highWord = (outval & 0xffff0000) >> 16;
+	///uint16_t lowWord = outval & 0x0000ffff;
+	// send these to the ADF4350 via SPI
+	///SendReceiveSPIData (highWord);
+	///SendReceiveSPIData (lowWord);
+
+	// delay so the clock has gone low before LE is taken high
 	Delay(10);
-	// Take LE high to load the data into the register
-	*(uint32_t *)(GPIOA_BASE + 0x10) = BIT_2;
-	// Short delay while LE is high (minimum of 20ns)
+	// pull LE high to load the data into the ADF4350 register
+	PORTB |= (1 << PORTB3);
+	// short delay while LE is high (minimum of 20ns)
 	Delay(30);
-	// Take LE low again
-	*(uint32_t *)(GPIOA_BASE + 0x14) = BIT_2;
+	// pull LE low again
+	PORTB &= ~(1 << PORTB3);
 }
\ No newline at end of file