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#!/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/>.

import sys
import yaml

template = '''\
/* This file is part of the libopencm3 project.
 *
 * It was generated by the irq2nvic_h script.
 */

#ifndef {includeguard}
#define {includeguard}

/** @defgroup CM3_nvic_defines_{partname_doxygen} User interrupts for {partname_humanreadable}
    @ingroup CM3_nvic_defines

    @{{*/

{irqdefinitions}

#define NVIC_IRQ_COUNT {irqcount}

/**@}}*/

#define WEAK __attribute__ ((weak))

/** @defgroup CM3_nvic_isrprototypes_{partname_doxygen} User interrupt service routines (ISR) prototypes for {partname_humanreadable}
    @ingroup CM3_nvic_isrprototypes

    @{{*/

{isrprototypes}

/**@}}*/

/** @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}

#endif /* {includeguard} */
'''

def convert(infile, outfile):
    data = yaml.load(infile)

    irq2name = list(enumerate(data['irqs']) if isinstance(data['irqs'], list) else data['irqs'].items())
    irqnames = [v for (k,v) in irq2name]

    data['irqdefinitions'] = "\n".join('#define NVIC_%s_IRQ %d'%(v.upper(),k) for (k,v) in irq2name)
    data['irqcount'] = len(irq2name) # FIXME: what if it's a sparse dictionary?
    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)

    outfile.write(template.format(**data))

def main():
    convert(open('irq.yaml'), open('nvic.h', 'w'))

if __name__ == "__main__":
    main()