8-bit MicrocontrollersのトピックRe: Compiler Option

Compiler Option

Brax02 — Tue, 23 Jul 2013 14:03:02 GMT

Hello,

I have a basic question about the compiler options

in my PRM file I have the following configuration about the Z_RAM direct access

Z_RAM = READ_WRITE 0x0080 TO 0x00FF;

DEFAULT_RAM, INTO Z_RAM;

etc..

_DATA_ZEROPAGE, /* zero page variables */

MY_ZEROPAGE INTO Z_RAM;

in main.asm

MY_ZEROPAGE: section

abcd: DS.B 1

main: section

LDA abcd ; 3 bytes used in memory (2 bytes for the addresses)

LDA abcd.B ;2 bytes used in memory (1 bytes for the addresses)

How is it possible to configure the compiler to do the difference between a direct address and a long address by itself to optimize the code size ?

Re: Compiler Option

ZhangJennie — Wed, 24 Jul 2013 09:22:28 GMT

can you please upload your demo project to showcase us your issue? thanks!

Re: Compiler Option

bigmac — Thu, 25 Jul 2013 05:21:15 GMT

Hello,

The PRM file, which identifies the addresses of the various section names, is accessed by the linker, but not the assembler. The assembler will normally assume that all variables have 16 bit addresses, by default. Any variables to be specifically located within zero page RAM can be identified with the assembler directive XREFB.

Regards,

Mac

Re: Compiler Option

Brax02 — Thu, 25 Jul 2013 08:46:04 GMT

ok thanks a lot !