Is this a FAQ? Shift operator problem.

[Manzo Saita]

Sorry. I don't write english well. Please to decipher.


This work well.

[ckielstra]

Looks like an integer type cast problem. By default the compiler will choose the smallest integer type fitting your constant, i.e. the value of 1 will fit into an int8.
Shifting an int8 by 20 positions results into 0.
Casting to an int32 before the shift is performed should solve the problem.

I don't have a compiler here to test with, but try the following:

[Ttelmah]

In all honesty though, is is perhaps worth saying, to consider using the bit_set operator instead. You are just turning on bit 20 of your value, so:

bit_set(your_int32,20);

will do the same, and generate a _lot_ faster code. Single bit set operation....

Best Wishes

[Manzo Saita]

Thanks! ckielstra, Ttelmah.

I did not want to use the bit_set().
I did not know the features of the automatic type conversion of ccs-c.
Thank you very mach.
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--- Manzo Saita ---