diff --git a/hdk_gettingstarted.md b/hdk_gettingstarted.md
index ac0c9e8..af4b24c 100644
--- a/hdk_gettingstarted.md
+++ b/hdk_gettingstarted.md
@@ -49,71 +49,7 @@ The program will need to be uploaded to the HDK. Once complete, run the command:
 
 On the serial console of the HDK, the words "Testing 1 2 3" should appear.
 
-```C
-// Written by Nick Gammon
-// February 2011
-/**
- * Send arbitrary number of bits at whatever clock rate (tested at 500 KHZ and 500 HZ).
- * This script will capture the SPI bytes, when a '\n' is recieved it will then output
- * the captured byte stream via the serial.
- */
-
-#include <SPI.h>
-
-char buf [100];
-volatile byte pos;
-volatile boolean process_it;
-
-void setup (void)
-{
-  Serial.begin (115200);   // debugging
-
-  // have to send on master in, *slave out*
-  pinMode(MISO, OUTPUT);
-  
-  // turn on SPI in slave mode
-  SPCR |= _BV(SPE);
-  
-  // get ready for an interrupt 
-  pos = 0;   // buffer empty
-  process_it = false;
-
-  // now turn on interrupts
-  SPI.attachInterrupt();
-
-}  // end of setup
-
-
-// SPI interrupt routine
-ISR (SPI_STC_vect)
-{
-byte c = SPDR;  // grab byte from SPI Data Register
-  
-  // add to buffer if room
-  if (pos < sizeof buf)
-    {
-    buf [pos++] = c;
-    
-    // example: newline means time to process buffer
-    if (c == '\n')
-      process_it = true;
-      
-    }  // end of room available
-}  // end of interrupt routine SPI_STC_vect
-
-// main loop - wait for flag set in interrupt routine
-void loop (void)
-{
-  if (process_it)
-    {
-    buf [pos] = 0;  
-    Serial.println (buf);
-    pos = 0;
-    process_it = false;
-    }  // end of flag set
-    
-}  // end of loop
-```
+[Code for the HDK](spi.ino)
 
 ## Additional Information + Useful Links
 
diff --git a/spi.ino b/spi.ino
new file mode 100644
index 0000000..e69de29