66 lines
1.7 KiB
Python
66 lines
1.7 KiB
Python
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#
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# Convert Motorola SREC to binary ROM files (both a 512KB main file and 8KB sector files for non-empty sectors)
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#
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# usage: python srec2bin.py
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#
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import re
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def srec_add_data(rom, address, data):
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"""Add a line of data from an SREC file (hex digits) to the binary image at the given address"""
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data_bytes = bytearray.fromhex(data)
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for i in range(len(data_bytes)):
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rom[address + i] = data_bytes[i]
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def srec_process(rom, line):
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"""Process a line of a Motorola SREC file"""
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m = re.match(r'^S(\d)([0-9a-fA-F]{2})([0-9a-fA-F]+)$', line)
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if m:
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type = int(m.group(1), 10)
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size = int(m.group(2), 16)
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addr_data_chk = m.group(3)
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if type == 3:
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m2 = re.match(r'^([0-9a-fA-F]{8})([0-9a-fA-F]+)([0-9a-fA-F]{2})$', addr_data_chk)
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if m2:
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address = int(m2.group(1),16)
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data = m2.group(2)
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chksum = m2.group(3)
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if address >= rom_base:
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srec_add_data(rom, address - rom_base, data)
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def bank_has_data(rom, bank):
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"""Check to see if a bank is empty (all 0xFF)"""
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start = bank * 8192
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end = start + 8192
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for i in range(start, end):
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if rom[i] != 0xff:
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# Return True if we find a non-blank entry
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return True
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return False
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rom_size = 512 * 1024
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rom_base = 0xf80000
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input_file = "toolbox.s37"
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output_file = "toolbox.bin"
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rom_image = bytearray(rom_size)
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for i in range(rom_size):
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rom_image[i] = 0xff
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with open(input_file, "r") as input:
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for line in input:
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srec_process(rom_image, line)
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with open("toolbox.bin", "wb") as output:
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output.write(rom_image)
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for bank in range(0, 64):
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if bank_has_data(rom_image, bank):
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output_name = "toolbox-{:02X}.bin".format(bank)
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with open(output_name, "wb") as output:
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output.write(rom_image[bank * 8192:bank * 8192 + 8192])
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