8-bit MicrocontrollersのトピックRe: Error Message : Complex Relocatable Expression

Error Message : Complex Relocatable Expression

mylim — Thu, 29 Oct 2020 09:02:55 GMT

Hi, I encountered the above mentioned error message in my ISR routine ;

Code:

           bset   RXBITCNT,RXBUF+RXBYTECNT

RXBYTECNT is a counter counting the pointer for RXBUF.

RXBITCNT is a counter counting the bit.

any methods to resolve this?

Thanks.

Regards

Re: Error Message : Complex Relocatable Expression

tonyp — Wed, 24 Oct 2007 21:07:10 GMT

Bit instructions for the HC(S)08 use a fixed number between 0 and 7 for the bit. This is an immediate value, not a variable that contains the number. In your case, RXBITCNT should be EQUed to the specific bit number. To do what you want, you'll need to write a small routine that will move a bit to correct position (based on RXBITCNT) within the byte, and using LDA / OR (for BSET) or AND (with inverted mask for BCLR) / STA instructions, update the destination variable (RXBUF+RXBYTECNT) which again must specify an address directly (not as pointer, as I suspect you're trying to do by adding RXBUF + RXBYTECNT).

Also, some assemblers expect expressions to be inside brackets or similar decorations.

Re: Error Message : Complex Relocatable Expression

mylim — Wed, 24 Oct 2007 21:36:43 GMT

Hi Tony,

Thanks.

I am not intending to add RXBUF to RXBYTECNT.

I am aware of the method you were suggesting.

I tried this stupid method of mine because i thought the method u suggest will take a bit long.

Seems like that's the only way?

Re: Error Message : Complex Relocatable Expression

CompilerGuru — Thu, 29 Oct 2020 09:02:57 GMT

Confused:
>I am not intending to add RXBUF to RXBYTECNT.
But in the original post:

>           bset   RXBITCNT,RXBUF+RXBYTECNT

Looks to me as if you would add them.

Anyway a "Complex Relocatable Expression" is anything which is not "Relocatable Expression"
(or a constant expression), so basically if the assembler takes both RXBUF & RXBYTECNT to be relocatable,
then the sum of the two is causing the "Complex Relocatable Expression".
To resolve it, one of the two should be a constant, say an EQU or SET defined before that
bset.
Basically the assembler does not support to emit the sum of two relocatable objects as fixups.

Daniel