Email: Password: Remember Me | Create Account (Free)


 

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
Maarten Brock
07/08/09 14:31
Read: 247 times
Tilburg
The Netherlands


 
Msg Score: +1
 +1 Informative		 #166881 - internals of SDCC
Responding to: Andy Neil's previous message
Sorry if I wasn't soon enough, but here goes...

This requirement of needing to know about the ISR's when compiling the file with main() is a shortcut from earlier days to circumvent the use of .org statements. When SDCC encounters the implementation of main() it also inserts startup code into the generated asm. The reset vector and interrupt vectors are also a part of it. So SDCC needs to know all ISR's at that time. The .org statement is only allowed in absolute code segments and this prevents relocating the code.

When time allows I will one day remove this requirement and let SDCC issue the vector when it encounters the ISR implementation.

Maarten

List of 29 messages in thread
TopicAuthorDate
Pseudo timers make programming delays easy.        Murray R. Van Luyn      06/21/09 23:10      
   volatile + racing condition      Per Westermark      06/21/09 23:55      
      slow processors      Per Westermark      06/22/09 01:27      
         You beat me to it...      Jez Smith      06/22/09 01:50      
      Timers_0.1 available.      Murray R. Van Luyn      06/22/09 01:52      
         SDCC      Jan Waclawek      06/22/09 02:19      
            ISR defining with SDCC      Mahesh Joshi      06/22/09 02:42      
               oh, I just read it in the manual      Jan Waclawek      06/22/09 02:50      
                  only conditionally, as #ifdef SDCC      Andy Neil      06/22/09 03:20      
               SDCC and ISRs      Andy Peters      06/23/09 14:17      
                  Prototyping ISRs      Andy Neil      06/23/09 16:04      
                     you can see it as if....      Jan Waclawek      06/23/09 16:39      
                        SDCC Quirk?      Andy Neil      06/23/09 16:56      
                           internals of SDCC        Maarten Brock      07/08/09 14:31      
                     duh      Andy Peters      06/24/09 14:49      
         Too quick        Per Westermark      06/22/09 02:38      
            I see something else...        Jan Waclawek      06/22/09 02:53      
               That helped.      Murray R. Van Luyn      06/22/09 22:33      
            Oops! Timers_0.2 available.      Murray R. Van Luyn      06/22/09 22:23      
               you persist      Erik Malund      06/23/09 07:25      
   Good idea!      Andy Neil      06/22/09 01:46      
   atomicity      Erik Malund      06/22/09 08:13      
      No      Jez Smith      06/23/09 08:40      
         I gladly, click on a link ....      Erik Malund      06/23/09 08:53      
            Direct link      Jon Ledbetter      06/23/09 10:54      
               that was clearly possible, I wonder why ...      Erik Malund      06/23/09 14:11      
               one more thing, now we are digging deep      Erik Malund      06/25/09 06:37      

Back to Subject List