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      Problem found and solved. The platformio teensy configurartion file version 4.17 uses the "cxx_flags" switch "-fsingle-precision-constant", which if perfect for the Teensy3.x, because their Floating Point Unit (FPU) can handle only 'floats'. But...
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      I am using VS code with platform.io with the follow snippet of settings in c_cpp_properties.json: "defines": [ "PLATFORMIO=60115", "__IMXRT1062__", "ARDUINO_TEENSY41"...
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      I did a simple test on my teensy4.1: double a = 1.00001; double b = 1.00001; Serial.printf("a %.16f b %.16f a*b %.16f", a, b, a*b); and got this result: a 1.0000100135803223 b 1.0000100135803223 a*b 1.0000200272609163 I expected: a...
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