Hi all,
I´ve been trying to implement TDC(time delay close) and TDO (time delay open)
contact relays into pic program and I am facing some trouble that I need to
clarify. I am working with pic 16f877a and SDCC 3.6. I´m not an assembler
programmer only C programmer.
What my program need to do.
It need to charge datas asynchronous event time into an array of timer event
structures, sequences it, and order fastest event to slowest and change output
relay into right time. I plan to use only one pic timer to do this and I can
have until 6 time contact relays.
1st) About struct
I created a typedef struct tmrevent that holds 5 int members to hold TMR1H,
TMR1L, overflowtimertimes and another int datas. Into Gcc this array could be
done like this:
Typedef struct tmrevent {
int member1;
int member2;
...
int member;
};
tmrevent tv[4];
this code in Gcc works fine and I have an array of tmrevent struct with 4
structs. But in SDCC this code compiles but doesn't link. Why?
Is there another way to define an array of structs in SDCC? Could you tell me
pls?
2nd) If I address only one struct my code works but I must declare it like an
array like below and only one array element is possible to use. My sdcc
installation doesn´t have MALLOC.H header file to declare a space to hold many
struct in a pointer.
__at(0x0020) tmrevent tv[]; // compiles and linker but only one element works
3rd) I read sdcc 3.6.1 manual item 3.1.1 (only this item talk about structures
in manual ) but I can´t clarify much about how structs could be declare with
sdcc. Could you inform some book or tutorial that cover this subject. I will
appreciate a lot.
4th) I did a test declaring many separate timer event structs addressing
directly all of them respecting GPIO addressable memory. I try to use more than
a memory bank and another problem occurs. It seems bank 1 is mirrored of bank
0. I found some posts that tell about this condition but none explain how to
use direct address to write member structs in the correct bank. For example if
I declare a struct in address 0x0020 (first gpio in bank 0 ) the code works
fine. If I declare this struct into address 0x00A0 (first gpio in bank 1)
sometimes the code works sometimes don´t. What could be? It seems when program
counter is on bank 1 or bank 2 or 3 and interrupt overflow time occurs data
that will be record in bank 0 isn´t correctly write. But in SDCC I didn´t find
any example to solve this doubt.
I will appreciate a lot some answer.
Thank you all
Ubirajara Marques da Cruz
Email: birac...@cemig.com.br<mailto:birac...@cemig.com.br>
As informações contidas nesta mensagem e nos arquivos anexados são para uso
exclusivo do destinatário aqui indicado e podem conter assuntos comerciais, de
propriedade intelectual ou outras informações confidenciais, protegidas pelas
leis aplicáveis. É expressamente proibido o uso não autorizado ou a
disseminação desta mensagem ou parte dela. Caso não seja o destinatário
correto, por favor, notifique o remetente.
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Sdcc-user mailing list
Sdcc-user@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/sdcc-user
