CANpack code generation Problem for MCU without floating-point math capabilities
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zhichao li
am 16 Sep. 2023
Beantwortet: zhichao li
am 17 Sep. 2023
real32_T outValue = 0;
{
real32_T result =aa;
result =bb;
outValue = roundf(result);
"This facility may not be available on configurations of the EWL that run on platforms
that do not have floating-point math capabilities. "
--EWL C Reference Manual.pdf
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Walter Roberson
am 17 Sep. 2023
Bearbeitet: Walter Roberson
am 17 Sep. 2023
roundf has been part of the C standard library since C99. However it expects floating point input and returns floating point output, which is a problem if you are using a system that does not have floating point hardware.
On a system that does not have floating point hardware, you have two choices:
- you can carefully write your code to only operate on the int* and uint* classes; or
- you can convert your code to use fixed-point arithmetic with the Fixed-Point Toolbox. The fixed point toolbox can emulate many floating-point operations in software, including potentially to greater precision than double precision floating point. However, transcendental functions such as trig functions or log generally have to be rewritten; search for CORDIC for those.
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