diff --git a/src/Makefile b/src/Makefile
new file mode 100644
index 0000000..a6a3254
--- /dev/null
+++ b/src/Makefile
@@ -0,0 +1,15 @@
+SRC=blink_led.c
+
+CC=sdcc
+FAMILY=pic14
+PROC=16f1575
+
+all: $(SRC:.c=.hex)
+
+$(SRC:.c=.hex): $(SRC)
+	$(CC) --use-non-free -m$(FAMILY) -p$(PROC) $^
+
+clean:
+	rm -f $(SRC:.c=.asm) $(SRC:.c=.cod) $(SRC:.c=.hex) $(SRC:.c=.lst) $(SRC:.c=.o)
+
+.PHONY: all clean
diff --git a/src/blink_led.c b/src/blink_led.c
new file mode 100644
index 0000000..aabc5a9
--- /dev/null
+++ b/src/blink_led.c
@@ -0,0 +1,42 @@
+// led blink example Copyright (C) 2014 Diego Herranz
+
+#define NO_BIT_DEFINES
+#include <pic14regs.h>
+#include <stdint.h> 
+
+// Oscillator Selection bits (INTOSCIO oscillator: I/O function on RA6/OSC2/CLKOUT pin, I/O function on RA7/OSC1/CLKIN),
+// disable watchdog,
+// and DO NOT disable low voltage programming.
+// The rest of fuses are left as default.
+__code uint16_t __at (_CONFIG1) __configword = _WDTE_OFF & _BOREN_ON & _CP_OFF;
+
+#define LED_PORT PORTCbits.RC5
+#define LED_TRIS TRISCbits.TRISC5
+
+// board layout:
+// mosfets clockwise from power feed:
+// RA5, RA4, RC2, RC3
+// 'input' pin: RC5
+
+// Uncalibrated delay, just waits a number of for-loop iterations
+void delay(uint16_t iterations)
+{
+	uint16_t i;
+	for (i = 0; i < iterations; i++) {
+		// Prevent this loop from being optimized away.
+		__asm nop __endasm;
+	}
+}
+
+void main(void)
+{
+	LED_TRIS = 0; // Pin as output
+	LED_PORT = 0; // LED off
+	
+	while (1) {
+		LED_PORT = 1; // LED On
+		delay(30000); // ~500ms @ 4MHz
+		LED_PORT = 0; // LED Off
+		delay(30000); // ~500ms @ 4MHz
+	}
+}
diff --git a/src/default.nix b/src/default.nix
new file mode 100644
index 0000000..55a0fd7
--- /dev/null
+++ b/src/default.nix
@@ -0,0 +1,17 @@
+with import <nixpkgs> {};
+let
+  gputils = callPackage ./gputils.nix {};
+  sdcc = pkgs.callPackage ./sdcc.nix {
+    inherit gputils;
+    disabled = lib.splitString " " "mcs51 z80 z180 r2k r3ka gbz80 tlcs90 ds390 ds400 pic16 hc08 s08 stm8";
+  };
+in
+stdenv.mkDerivation {
+  name = "blink";
+  buildInputs = [ sdcc gputils ];
+  src = ./.;
+  installPhase = ''
+    mkdir $out
+    cp blink_led.hex $_
+  '';
+}
diff --git a/src/gputils.nix b/src/gputils.nix
new file mode 100644
index 0000000..dc736e2
--- /dev/null
+++ b/src/gputils.nix
@@ -0,0 +1,16 @@
+{ stdenv, fetchurl }:
+
+stdenv.mkDerivation rec {
+  version = "1.5.0-1";
+  name = "gputils-${version}";
+  src = fetchurl {
+    url = "mirror://sourceforge/gputils/${name}.tar.bz2";
+    sha256 = "055v83fdgqljprapf7rmh8x66mr13fj0qypj49xba5spx0ca123g";
+  };
+  meta = with stdenv.lib; {
+    homepage = http://sdcc.sourceforge.net/;
+    license = licenses.gpl2;
+    platforms = platforms.linux;
+    maintainers = [ maintainers.yorickvp ];
+  };
+}
diff --git a/src/sdcc.nix b/src/sdcc.nix
new file mode 100644
index 0000000..f2b6e3a
--- /dev/null
+++ b/src/sdcc.nix
@@ -0,0 +1,37 @@
+{ stdenv, fetchurl, bison, flex, boost, texinfo, autoconf, gputils ? null, disabled ? [] }:
+let
+  allDisabled = (if gputils == null then [ "pic14" "pic16" ] else []) ++ disabled;
+  # choices: mcs51 z80 z180 r2k r3ka gbz80 tlcs90 ds390 ds400 pic14 pic16 hc08 s08 stm8
+  inherit (stdenv) lib;
+in
+stdenv.mkDerivation rec {
+  version = "3.7.0";
+  name = "sdcc-${version}";
+
+  src = fetchurl {
+    url = "mirror://sourceforge/sdcc/sdcc-src-${version}.tar.bz2";
+    sha256 = "13llvx0j3v5qa7qd4fh7nix4j3alpd3ccprxvx163c4q8q4lfkc5";
+  };
+
+  buildInputs = [ bison flex boost texinfo gputils autoconf ];
+
+  configureFlags = ''
+    ${lib.concatMapStringsSep " " (f: "--disable-${f}-port") allDisabled}
+  '';
+
+  meta = with lib; {
+    description = "Small Device C Compiler";
+    longDescription = ''
+      SDCC is a retargettable, optimizing ANSI - C compiler suite that targets
+      the Intel MCS51 based microprocessors (8031, 8032, 8051, 8052, etc.), Maxim
+      (formerly Dallas) DS80C390 variants, Freescale (formerly Motorola) HC08 based
+      (hc08, s08) and Zilog Z80 based MCUs (z80, z180, gbz80, Rabbit 2000/3000,
+      Rabbit 3000A). Work is in progress on supporting the Microchip PIC16 and
+      PIC18 targets. It can be retargeted for other microprocessors.
+    '';
+    homepage = http://sdcc.sourceforge.net/;
+    license = licenses.gpl2;
+    platforms = platforms.linux;
+    maintainers = [ maintainers.bjornfor maintainers.yorickvp ];
+  };
+}