TMS320F28337D - long double numercial issue

Jeremias Reith

Hi,

I am working with TMX320F28337D and using 64-bit long double precision.

Setting a value of e.g. 0.1 to any variable does not succeed. Write access with CPU is only possible for 32-bit single precision digits. All further digits show undefined digit values.

BUT: Write access made by debugger is successful.

Does anybody have the same behaviour? How can I proceed?

I am working with CCS Version 6.0.0.00190, Compiler Version TU v6.2.5.

See attached one example showing globally initialized variable with value of 0.1 value and the wrong value after power up.

Thanks for any help...

Jeremias

over 8 years ago

0 Vishal_Coelho over 8 years ago

TI__Mastermind 20850 points

Hi Jeremias,

You need to stick an L after the constant

long double Global_Test_Value = 0.1L;

The L tells its its a long double, if you dont use it it will assume its a single precision float and then cast to long double which is what you are seeing.

0 Jeremias Reith over 8 years ago in reply to Vishal_Coelho

Prodigy 130 points

Many thanks, this actually helps

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TMS320F28337D - long double numercial issue