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modbus

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Modbus library with TCP Master & Slave implementation.

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modbus test float_test.exs
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test/float_test.exs 

defmodule FloatTest do

  use ExUnit.Case

  alias Modbus.IEEE754



  # https://www.h-schmidt.net/FloatConverter/IEEE754.html

  # endianess tested agains opto22 analog modules

  test "float convertion test" do

    assert [0xC0A0, 0x0000] == IEEE754.to_2_regs(-5.0, :be)

    assert [0x0000, 0xC0A0] == IEEE754.to_2_regs(-5.0, :le)

    assert [0x40A0, 0x0000] == IEEE754.to_2_regs(+5.0, :be)

    assert [0x0000, 0x40A0] == IEEE754.to_2_regs(+5.0, :le)

    assert [0xC0A0, 0x0000, 0x40A0, 0x0000] == IEEE754.to_2n_regs([-5.0, +5.0], :be)

    assert [0x0000, 0xC0A0, 0x0000, 0x40A0] == IEEE754.to_2n_regs([-5.0, +5.0], :le)

    assert -5.0 == IEEE754.from_2_regs(0xC0A0, 0x0000, :be)

    assert -5.0 == IEEE754.from_2_regs(0x0000, 0xC0A0, :le)

    assert -5.0 == IEEE754.from_2_regs([0xC0A0, 0x0000], :be)

    assert -5.0 == IEEE754.from_2_regs([0x0000, 0xC0A0], :le)

    assert +5.0 == IEEE754.from_2_regs(0x40A0, 0x0000, :be)

    assert +5.0 == IEEE754.from_2_regs(0x0000, 0x40A0, :le)

    assert +5.0 == IEEE754.from_2_regs([0x40A0, 0x0000], :be)

    assert +5.0 == IEEE754.from_2_regs([0x0000, 0x40A0], :le)

    assert [-5.0, +5.0] == IEEE754.from_2n_regs([0xC0A0, 0x0000, 0x40A0, 0x0000], :be)

    assert [-5.0, +5.0] == IEEE754.from_2n_regs([0x0000, 0xC0A0, 0x0000, 0x40A0], :le)

  end

end