8000 Floating point byte order does not round-trip · Issue #807 · stephane/libmodbus · GitHub
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Floating point byte order does not round-trip #807

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johannes1971 opened this issue May 1, 2025 · 1 comment
Open

Floating point byte order does not round-trip #807

johannes1971 opened this issue May 1, 2025 · 1 comment

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@johannes1971
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johannes1971 commented May 1, 2025 •
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Maybe I just completely misunderstand how this works, but is it the intention that modbus_set_float_xxxx does not round-trip with modbus_get_float_xxxx? I.e.

std::array<uint16_t, 2> arr;
modbus_set_float_abcd (24.2, arr.data ());
LOG (std::format ("{}", modbus_get_float_abcd (arr.data ()))); // returns "-12.100244"

modbus_set_float_badc (24.2, arr.data ());
LOG (std::format ("{}", modbus_get_float_badc (arr.data ()))); // returns "-12.100244"

modbus_set_float_cdab (24.2, arr.data ());
LOG (std::format ("{}", modbus_get_float_cdab (arr.data ()))); // returns "-12.100244"

modbus_set_float_dcba (24.2, arr.data ());
LOG (std::format ("{}", modbus_get_float_dcba (arr.data ()))); // returns "-12.100244"

As it is, I have to apply a different byte order depending on whether I'm reading or writing, which feels rather counter-intuitive.
@johannes1971
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Is there any news on the question I raised above?

I'm after two pieces of information. The first is why round-tripping doesn't seem to work; this seems rather counter-intuitive to me, and I'd like to figure out if I'm doing something wrong. The second, perhaps more fundamental issue, is whether this library is still being maintained, or if the maintainers have given up and moved on.

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