portapack-mayhem/firmware/tools/make_spi_image.py

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#!/usr/bin/env python
#
# Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
#
# This file is part of PortaPack.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
import sys
usage_message = """
PortaPack SPI flash image generator
Usage: <command> <bootstrap_path> <baseband_path> <application_path> <output_path>
Where paths refer to the .bin files for each component project.
"""
def read_image(path):
f = open(path, 'rb')
data = f.read()
f.close()
return data
def write_image(data, path):
f = open(path, 'wb')
f.write(data)
f.close()
if len(sys.argv) != 5:
print(usage_message)
sys.exit(-1)
bootstrap_image = read_image(sys.argv[1])
baseband_image = read_image(sys.argv[2])
application_image = read_image(sys.argv[3])
output_path = sys.argv[4]
spi_size = 1048576
images = (
{
'name': 'bootstrap',
'data': bootstrap_image,
'size': 0x10000,
},
{
'name': 'baseband',
'data': baseband_image,
'size': 0x30000,
},
{
'name': 'application',
'data': application_image,
'size': len(application_image),
}
)
spi_image = bytearray()
spi_image_default_byte = bytearray((255,))
for image in images:
if len(image['data']) > image['size']:
raise RuntimeError('data for image "%(name)s" is longer than 0x%(size)x bytes' % image)
pad_size = image['size'] - len(image['data'])
padded_data = image['data'] + (spi_image_default_byte * pad_size)
spi_image += padded_data
if len(spi_image) > spi_size:
raise RuntimeError('SPI flash image size of %d exceeds device size of %d bytes' % (len(spi_image), spi_size))
write_image(spi_image, output_path)