39 lines
1.0 KiB
Nim
39 lines
1.0 KiB
Nim
# code for loading roms
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import def
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const FONT: array[FONT_SIZE, uint8] = [
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0xF0, 0x90, 0x90, 0x90, 0xF0, # 0
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0x20, 0x60, 0x20, 0x20, 0x70, # 1
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0xF0, 0x10, 0xF0, 0x80, 0xF0, # 2
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0xF0, 0x10, 0xF0, 0x10, 0xF0, # 3
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0x90, 0x90, 0xF0, 0x10, 0x10, # 4
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0xF0, 0x80, 0xF0, 0x10, 0xF0, # 5
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0xF0, 0x80, 0xF0, 0x90, 0xF0, # 6
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0xF0, 0x10, 0x20, 0x40, 0x40, # 7
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0xF0, 0x90, 0xF0, 0x90, 0xF0, # 8
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0xF0, 0x90, 0xF0, 0x10, 0xF0, # 9
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0xF0, 0x90, 0xF0, 0x90, 0x90, # A
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0xE0, 0x90, 0xE0, 0x90, 0xE0, # B
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0xF0, 0x80, 0x80, 0x80, 0xF0, # C
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0xE0, 0x90, 0x90, 0x90, 0xE0, # D
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0xF0, 0x80, 0xF0, 0x80, 0xF0, # E
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0xF0, 0x80, 0xF0, 0x80, 0x80, # F
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]
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proc load*(memory: var openArray[uint8], path: string): bool =
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# loads the rom and font data into memory
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# returns true on success
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let f = open(path)
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defer: f.close()
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let filesize = f.getFileSize
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if filesize > MEM_SIZE - ROM_OFFSET:
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return false
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discard f.readBytes(memory, ROM_OFFSET, MEM_SIZE - ROM_OFFSET)
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for i in 0 .. FONT_SIZE - 1:
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memory[i] = FONT[i]
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return true
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