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diff --git a/bitbucket_lpc1768/io-pin.ss b/bitbucket_lpc1768/io-pin.ss
new file mode 100644
index 0000000..5b8cda9
--- /dev/null
+++ b/bitbucket_lpc1768/io-pin.ss
@@ -0,0 +1,76 @@
+#lang scribble/text
+@(define ports '(P0 P1 P2 P3 P4))
+@(define registers '(LPC_GPIO0 LPC_GPIO1 LPC_GPIO2 LPC_GPIO3 LPC_GPIO4))
+/* 
+ * IO functions for NXP LPC1768. (generated file, check io-pin.ss)
+ *
+ * See also: http://bitbucket.org/jpc/lpc1768/
+ *
+ * Copyright (c) 2010 LoEE - Jakub Piotr Cłapa
+ * This program is released under the new BSD license.
+ */
+#ifndef IO_PIN_H
+#define IO_PIN_H
+
+#include "CMSIS/LPC17xx.h"
+
+enum pin_port {
+@(add-newlines
+  (for/list ([i (in-naturals)]
+             [port ports])
+    @list{@port = @(* i 32),}))
+};
+
+enum pin_dir {
+  PIN_IN = 0,
+  PIN_OUT = 1,
+};
+
+extern void invalid_pin_error () __attribute__((error ("Invalid IO pin number.")));
+ 
+@(define INLINE "extern __inline__ __attribute__((always_inline))")
+@(define-syntax-rule (switch pin_no i register template)
+   @list{switch(pin_no) {
+           @(add-newlines
+             (for/list ([i (in-naturals)]
+                        [register registers])
+               @list{case @(* i 32) ... @(sub1 (* (add1 i) 32)):
+                       @template}))
+           default:
+             invalid_pin_error ();
+             break;
+         }})
+
+@INLINE
+int pin_read (int pin_no)
+{
+  @(switch @{pin_no} i register
+           @list{return @|register|->FIOPIN & (1 << (pin_no - @(* i 32)));})
+  return 0;
+}
+
+@INLINE
+void pin_write (int pin_no, int value)
+{
+  @(switch @{pin_no} i register
+           @list{if (value) {
+                   @|register|->FIOSET = (1 << (pin_no - @(* i 32)));
+                 } else {
+                   @|register|->FIOCLR = (1 << (pin_no - @(* i 32)));
+                 }
+                 break;})
+}
+           
+@INLINE
+void pin_dir (int pin_no, enum pin_dir dir)
+{
+  @(switch @{pin_no} i register
+           @list{if (dir == PIN_OUT) {
+                   @|register|->FIODIR @"|=" (1 << (pin_no - @(* i 32)));
+                 } else {
+                   @|register|->FIODIR @"&=" (1 << (pin_no - @(* i 32)));
+                 }
+                 break;})
+}
+           
+#endif
\ No newline at end of file