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diff --git a/libopencm3/scripts/irq2nvic_h b/libopencm3/scripts/irq2nvic_h
new file mode 100755
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+++ b/libopencm3/scripts/irq2nvic_h
@@ -0,0 +1,174 @@
+#!/usr/bin/env python
+
+# This file is part of the libopencm3 project.
+# 
+# Copyright (C) 2012 chrysn <chrysn@fsfe.org>
+# 
+# This library is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+# 
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+# 
+# You should have received a copy of the GNU Lesser General Public License
+# along with this library. If not, see <http://www.gnu.org/licenses/>.
+
+"""Generate an nvic.h header from a small JSON file describing the interrupt
+numbers.
+
+Code generation is chosen here because the resulting C code needs to be very
+repetetive (definition of the IRQ numbers, function prototypes, weak fallback
+definition and vector table definition), all being very repetitive. No portable
+method to achive the same thing with C preprocessor is known to the author.
+(Neither is any non-portable method, for that matter.)"""
+
+import sys
+import os
+import os.path
+import json
+
+template_nvic_h = '''\
+/* This file is part of the libopencm3 project.
+ *
+ * It was generated by the irq2nvic_h script.
+ */
+
+#ifndef {includeguard}
+#define {includeguard}
+
+#include <libopencm3/cm3/nvic.h>
+
+/** @defgroup CM3_nvic_defines_{partname_doxygen} User interrupts for {partname_humanreadable}
+    @ingroup CM3_nvic_defines
+
+    @{{*/
+
+{irqdefinitions}
+
+#define NVIC_IRQ_COUNT {irqcount}
+
+/**@}}*/
+
+/** @defgroup CM3_nvic_isrprototypes_{partname_doxygen} User interrupt service routines (ISR) prototypes for {partname_humanreadable}
+    @ingroup CM3_nvic_isrprototypes
+
+    @{{*/
+
+BEGIN_DECLS
+
+{isrprototypes}
+
+END_DECLS
+
+/**@}}*/
+
+#endif /* {includeguard} */
+'''
+
+template_vector_nvic_c = '''\
+/* This file is part of the libopencm3 project.
+ *
+ * It was generated by the irq2nvic_h script.
+ *
+ * This part needs to get included in the compilation unit where
+ * blocking_handler gets defined due to the way #pragma works.
+ */
+
+
+/** @defgroup CM3_nvic_isrpragmas_{partname_doxygen} User interrupt service routines (ISR) defaults for {partname_humanreadable}
+    @ingroup CM3_nvic_isrpragmas
+
+    @{{*/
+
+{isrpragmas}
+
+/**@}}*/
+
+/* Initialization template for the interrupt vector table. This definition is
+ * used by the startup code generator (vector.c) to set the initial values for
+ * the interrupt handling routines to the chip family specific _isr weak
+ * symbols. */
+
+#define IRQ_HANDLERS \\
+    {vectortableinitialization}
+'''
+
+template_cmsis_h = '''\
+/* This file is part of the libopencm3 project.
+ *
+ * It was generated by the irq2nvic_h script.
+ *
+ * These definitions bend every interrupt handler that is defined CMSIS style
+ * to the weak symbol exported by libopencm3.
+ */
+
+{cmsisbends}
+'''
+
+def convert(infile, outfile_nvic, outfile_vectornvic, outfile_cmsis):
+    data = json.load(infile)
+
+    irq2name = list(enumerate(data['irqs']) if isinstance(data['irqs'], list) else data['irqs'].items())
+    irqnames = [v for (k,v) in irq2name]
+
+    if isinstance(data['irqs'], list):
+        data['irqcount'] = len(irq2name)
+    else:
+        data['irqcount'] = max([int(x) for x in data['irqs'].keys()]) + 1
+
+    data['irqdefinitions'] = "\n".join('#define NVIC_%s_IRQ %d'%(v.upper(),int(k)) for (k,v) in irq2name)
+    data['isrprototypes'] = "\n".join('void WEAK %s_isr(void);'%name.lower() for name in irqnames)
+    data['isrpragmas'] = "\n".join('#pragma weak %s_isr = blocking_handler'%name.lower() for name in irqnames)
+    data['vectortableinitialization'] = ', \\\n    '.join('[NVIC_%s_IRQ] = %s_isr'%(name.upper(), name.lower()) for name in irqnames)
+    data['cmsisbends'] = "\n".join("#define %s_IRQHandler %s_isr"%(name.upper(), name.lower()) for name in irqnames)
+
+    outfile_nvic.write(template_nvic_h.format(**data))
+    outfile_vectornvic.write(template_vector_nvic_c.format(**data))
+    outfile_cmsis.write(template_cmsis_h.format(**data))
+
+def makeparentdir(filename):
+    try:
+        os.makedirs(os.path.dirname(filename))
+    except OSError:
+        # where is my 'mkdir -p'?
+        pass
+
+def needs_update(infiles, outfiles):
+    timestamp = lambda filename: os.stat(filename).st_mtime
+    return any(not os.path.exists(o) for o in outfiles) or max(map(timestamp, infiles)) > min(map(timestamp, outfiles))
+
+def main():
+    if sys.argv[1] == '--remove':
+        remove = True
+        del sys.argv[1]
+    else:
+        remove = False
+    infile = sys.argv[1]
+    if not infile.startswith('./include/libopencm3/') or not infile.endswith('/irq.json'):
+        raise ValueError("Arguent must match ./include/libopencm3/**/irq.json")
+    nvic_h = infile.replace('irq.json', 'nvic.h')
+    vector_nvic_c = infile.replace('./include/libopencm3/', './lib/').replace('irq.json', 'vector_nvic.c')
+    cmsis = infile.replace('irq.json', 'irqhandlers.h').replace('/libopencm3/', '/libopencmsis/')
+
+    if remove:
+        if os.path.exists(nvic_h):
+            os.unlink(nvic_h)
+        if os.path.exists(vector_nvic_c):
+            os.unlink(vector_nvic_c)
+        sys.exit(0)
+
+    if not needs_update([__file__, infile], [nvic_h, vector_nvic_c]):
+        sys.exit(0)
+
+    makeparentdir(nvic_h)
+    makeparentdir(vector_nvic_c)
+    makeparentdir(cmsis)
+
+    convert(open(infile), open(nvic_h, 'w'), open(vector_nvic_c, 'w'), open(cmsis, 'w'))
+
+if __name__ == "__main__":
+    main()