AVR-Chat

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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