AVR-Chat

You can do the same thing by writing program modules that are generic in 
nature.  After a while you have a library of modules that can be 
messaged for a particular application as John stated.  That Dave Van 
Horn guy taught a lot of us some good basic proceedures...even though we 
may have worked with some of the older 8035/8048/8032 series chips.


REB

   

np np wrote:

>I go a bit further with this method and use a previous project as a template.
>I often find myself having the same subroutines in a lot of programs.
>This has the advantage of having fully tested code already written.
>
>http://www.ckp-railways.talktalk.net/pcbcad21.htm
>
>
>John Samperi <samperi@ampertronics.com.au> wrote:                                  At 03:27 AM 19/01/2007, you wrote:
> > > That is why I have adopted the practice of installing a
> > > full vector table, with all the standard labels and filling
> > > the unused ones with RETI or jump to an error handler.
> 
> A practise that I have also adopted. With the AVR I have developed
> interrupt vector and interrupt service routines files for each type
> of processor that I use. With the vector file I only need to .include
> the file into my multi file projects without changes. Following the
> problem a well know member of this list had with jmp and rjmp :) in
> the table I simply copy the vectors from the data sheet, add a ISR_
> keyword to each vector and save it. (so far the pdfs used are not
> copy protected) ie (part of the int_v_tiny2313.asm file)
> 
> ;Reset and Interrupt vectors Tiny2313
> ;
> .cseg
> 
> ;0x0000
>          rjmp    RESET                   ;Reset Handler
> ;0x0001
>          rjmp    ISR_INT0                ;External Interrupt0 Handler
> ;0x0002
>          rjmp    ISR_INT1                ;External Interrupt1 Handler
> 
> The standard interrupt service routines have been styled on examples
> found on David's old web page when I was first looking at the AVR.
> 
> (part of the int_s_tiny2313.asm file, save_sreg is usually r15)
> 
> ;REMEMBER to save any registers you may want to use here!
> ;Int. flags are automatically cleared.
> 
> .cseg
> ;
> ISR_INT0:
>          in              save_sreg,SREG          ;Save Status register
> ;Do something here
>          out             SREG,save_sreg          ;Restore Status register
>          reti
> ;
> ISR_INT1:
>          in              save_sreg,SREG          ;Save Status register
> ;Do something here
>          out             SREG,save_sreg          ;Restore Status register
> 
> all I need to do with the service file is to copy it into a file
> which is specific to the project and then either copy code from
> another project or write handlers for the project. ie the
> int_s_tiny2313.asm file would be copied to int_s_projectname.asm file
> and massaged as necessary.
> 
> Using multiple files in your project has the advantage of not having
> long files clogging up your screen and they are also easier to manage.
> 
> Regards
> 
> John Samperi
> 
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