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added compression of baseband images

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This commit is contained in:
Bernd Herzog 2023-03-21 19:18:38 +01:00
parent ce23c7d882
commit b856b047cc
8 changed files with 142 additions and 21 deletions
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25
firmware/tools/make_image_chunk.py
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@ -41,13 +41,20 @@ def write_image(data, path):
f.write(data)
f.close()
input_image_max_length = 32768
if len(sys.argv) in (4, 5):
compressed_data_size = 0
if len(sys.argv) == 4:
input_image = read_image(sys.argv[1])
tag = tuple(map(ord, sys.argv[2]))
output_path = sys.argv[3]
if len(sys.argv) == 5:
input_image_max_length = int(sys.argv[4])
if input_image[5] & 4 == 4:
input_image = input_image[19:]
else:
input_image = input_image[11:]
compressed_data_size = len(input_image)
elif len(sys.argv) == 2:
input_image = bytearray()
tag = (0, 0, 0, 0)
@ -60,13 +67,15 @@ if len(tag) != 4:
print(usage_message)
sys.exit(-2)
if len(input_image) > input_image_max_length:
raise RuntimeError('image size of %d exceeds device size of %d bytes' % (len(input_image), input_image_max_length))
if (len(input_image) & 3) != 0:
raise RuntimeError('image size of %d is not multiple of four' % (len(input_image,)))
input_image = bytearray(input_image)
for i in range(4 - (len(input_image) & 3)):
input_image.append(0)
output_image = bytearray()
output_image += struct.pack('<4BI', tag[0], tag[1], tag[2], tag[3], len(input_image))
output_image += struct.pack('<4BII', tag[0], tag[1], tag[2], tag[3], len(input_image), compressed_data_size)
output_image += input_image
write_image(output_image, output_path)