integer conversion resulted in a change of sign

Oldrabbit

Prodigy 30 points

Hello,

I am using CCS 6.1.2 and the microprocessor is TMS320F28377S

and getting warnings in the following code.

(.h file)

#define parameter1 (0xff*256+249)

-----------------------------------------------------

(.c file)

unsigned long message1;

message1 = parameter1;

------------------------------------------------------

I keep getting the 2 warnings,

"integer conversion resulted in a change of sign" and "integer operation result is out of range".

'0xff*256+249' is 153,075 in my calculation, which I think can be fit in the 'unsigned long'.

but, there is no further clues for me.

Any advice would be great helpful,

Regards,

over 9 years ago

0 George Mock over 9 years ago

TI__Guru**** 249860 points

Focus on the expression 0xff*256. The type of each operand is signed int, and so is the result. On C28x, the size of int is 16-bits. The value of the expression 0xff*256 does not fit in a signed 16-bit type. Thus the diagnostics. There are a few ways to fix it. The most straightforward is to change the type of a constant by adding a suffix. Try 0xffl * 256. Note the letter l added to 0xff.

Thanks and regards,

-George

0 Oldrabbit over 9 years ago in reply to George Mock

Prodigy 30 points

Warnings gone! Thx a lot.

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integer conversion resulted in a change of sign