27 lines
855 B
Nim
27 lines
855 B
Nim
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import io
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const portCOM1 = 0x3f8'u16
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proc init*() =
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io.outb((portCOM1 + 1, 0x00'u8)); # Disable all interrupts
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io.outb((portCOM1 + 3, 0x80'u8)); # Enable DLAB (set baud rate divisor)
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io.outb((portCOM1 + 0, 0x03'u8)); # Set divisor to 3 (lo byte) 38400 baud
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io.outb((portCOM1 + 1, 0x00'u8)); # (hi byte)
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io.outb((portCOM1 + 3, 0x03'u8)); # 8 bits, no parity, one stop bit
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io.outb((portCOM1 + 2, 0xC7'u8)); # Enable FIFO, clear them, with 14-byte threshold
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io.outb((portCOM1 + 4, 0x0B'u8)); # IRQs enabled, RTS/DSR set
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proc isTransitEmpty(): uint =
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result = io.inb(portCOM1 + 5) and 0x20'u
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proc write*(input: char) =
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while isTransitEmpty() == 0:
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discard
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io.outb((portCOM1, uint8(input)))
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proc write*(input: string) =
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for i in 0 .. input.len - 1:
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write(input[i])
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write('\L')
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