36 lines
872 B
Lua
36 lines
872 B
Lua
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-- UART device
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-- For now, this just prints to the server console.
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function LCPU.Devices.UART(base)
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local uart = LCPUNative.CreateDevice(base, 0xc)
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uart.buffer = ""
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function uart:Peek(address)
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if address == self.Base then return 0 end
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if address == self.Base + 5 then return 0x60 end -- Active, but no keyboard input
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return 0xffffffff
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end
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function uart:Poke(address, value)
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if address == self.Base then
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local c = bit.band(value, 0x000000ff)
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if c == 0 then return end
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-- On newline or reaching length limit
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-- print the buffer and then reset it
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if c == 0xa or #self.buffer >= 256 then
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print(string.format("UART: %s", self.buffer))
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self:Reset()
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else
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-- Not a newline so we can keep going with it
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self.buffer = self.buffer .. string.char(c)
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end
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end
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end
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function uart:Reset()
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self.buffer = ""
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end
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return uart
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end
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