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Re: [avr-gcc-list] Global variables in pure assembler??

From: Larry Barello
Subject: Re: [avr-gcc-list] Global variables in pure assembler??
Date: Fri, 27 Jun 2003 15:16:29 -0700

You want .comm, not .lcomm (which is a local)  and you don't need to fool
around with sections either.  They will go into the right section

    .comm    myvar, 1        ; Reserve a byte for "myvar"
    .comm    yourvar, 4    ; Reserver four bytes for "yourvar"
    .lcomm    localvar, 1    ; a single "static" byte (e.g. local)

The type is set in the C header file.  You can address it directly with an
LDS or use lo8() and hi8() to get the address into a register pair.


----- Original Message -----
From: "blight" <address@hidden>
To: <address@hidden>
Sent: Friday, June 27, 2003 12:06 PM
Subject: [avr-gcc-list] Global variables in pure assembler??

> Hi!
> I am writing a driver for some device in pure ASM bcause it needs to be
> and accurate. It needs 2 static vars with global scope (in "C words")
> I was looking at the output of avr-gcc but i wasn't able to get it
> One var should be unsigned char recv_data[4]; and the other unsigned char
> bytes_recvd = 0;
> I tried some different code like the following:
> ---------------------------------------------------------------------
> .section .bss
> recv_data:

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