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2005-11-06 by Sebastien Jacquemard
Hello, I need to declare a pointer to code with GCC. With 8051 and keil PK51 I do this for exemple "char code *p" How can I do the same thing with GCC (I use GCC with keil IDE) ? Thanks, Sebastien
2005-11-06 by Richard Duits
Hello Sebastien, You don't need to, the ARM has only one 32 bit address space that contains everything (code, data, readonly data, memory mapped registers, and more). So a "char *p" or "const char *p" can point to anything in rom, ram, external memory, etc. Richard. Sebastien Jacquemard wrote:
> Hello, > I need to declare a pointer to code with GCC. > With 8051 and keil PK51 I do this for exemple "char code *p" > How can I do the same thing with GCC (I use GCC with keil IDE) ? > > Thanks, > Sebastien > > > > ------------------------------------------------------------------------ > YAHOO! GROUPS LINKS > > * Visit your group "lpc2000 > <http://groups.yahoo.com/group/lpc2000>" on the web. > > * To unsubscribe from this group, send an email to: > lpc2000-unsubscribe@yahoogroups.com > <mailto:lpc2000-unsubscribe@yahoogroups.com?subject=Unsubscribe> > > * Your use of Yahoo! Groups is subject to the Yahoo! Terms of > Service <http://docs.yahoo.com/info/terms/>. > > > ------------------------------------------------------------------------ >
2005-11-06 by Sebastien Jacquemard
thanks, sebastien ----- Original Message -----
From: "Richard Duits" <yahoo@...> To: <lpc2000@yahoogroups.com> Sent: Sunday, November 06, 2005 11:56 AM Subject: Re: [lpc2000] Code pointer with GCC > Hello Sebastien, > > You don't need to, the ARM has only one 32 bit address space that > contains everything (code, data, readonly data, memory mapped registers, > and more). So a "char *p" or "const char *p" can point to anything in > rom, ram, external memory, etc. > > Richard. > > > Sebastien Jacquemard wrote: > > > Hello, > > I need to declare a pointer to code with GCC. > > With 8051 and keil PK51 I do this for exemple "char code *p" > > How can I do the same thing with GCC (I use GCC with keil IDE) ? > > > > Thanks, > > Sebastien > > > > > > > > ------------------------------------------------------------------------ > > YAHOO! GROUPS LINKS > > > > * Visit your group "lpc2000 > > <http://groups.yahoo.com/group/lpc2000>" on the web. > > > > * To unsubscribe from this group, send an email to: > > lpc2000-unsubscribe@yahoogroups.com > > <mailto:lpc2000-unsubscribe@yahoogroups.com?subject=Unsubscribe> > > > > * Your use of Yahoo! Groups is subject to the Yahoo! Terms of > > Service <http://docs.yahoo.com/info/terms/>. > > > > > > ------------------------------------------------------------------------ > > > > > > > > Yahoo! Groups Links > > > > > > > > >
2005-11-08 by vineet jain
Hi,
There are no overlapping memory addresses of RAM and ROM like in 8051. Here the address space is linear. You'll know your memory layout once you look at the datasheet. So if you want to fetch a byte --> use char pointer, 4 bytes use int pointer etc..
If you want the pointer to point a particular address use this :
char *ptr = (char *) 0x10000;
Hence ptr points to memory location 0x10000.
Cheers,
Vineet.
Sebastien Jacquemard <sejacquemard@...> wrote:
Hello,
I need to declare a pointer to code with GCC.
With 8051 and keil PK51 I do this for exemple "char code *p"
How can I do the same thing with GCC (I use GCC with keil IDE) ?
Thanks,
Sebastien
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