In the future, when 10K parts come up, I'm going to rewrite malloc in the
following way:
- The memory above 2K (5K and 8K in 16xx devices) will be called '.heap'.
- Compiler itself wont be allowed to allocate memory there without user's
intrusion.
- malloc()'s bottom will be heap's bottom, which will be calculated as
a .heap bottom + numb of user allocated bytes there.
- malloc() calls for any other devices will return zero.
suggestions?
cheers,
~d
On Tuesday 18 November 2003 02:52, Chris Liechti wrote:
> Robert Seczkowski wrote:
> > snprintf doesn't work as snprintf(buffer,10," %2s ",string).
> > It does nothing.
>
> it works for me. that snippet (with appropriate init, not shown):
>
> char buffer[80];
> snprintf(buffer, sizeof(buffer), "number: %d string: %s", 1234,"hello");
> puts(buffer);
>
> outputs over the serial port:
> """
> number: 1234 string: hello
> """
>
> > Also malloc reserves begining of .noinit section for heap storage
> > whereas compiler doesn't know about it and variables declared to be in
> > .noinit section are overitten!
>
> i usualy dont use malloc.. but i did a quick test:
>
> i haev a global:
> int global;
>
> and locals in main():
> char * xa;
> char * xb;
>
> //init snipped
>
> xa = malloc(10);
> xb = malloc(10);
> printf("xa: 0x%04x\n", xa);
> printf("xb: 0x%04x\n", xb);
> printf("global: 0x%04x\n", &global);
>
> output:
> xa: 0x020e
> xb: 0x021a
> global: 0x020a
>
> looks fine, xa starts after the global, ad xb starts exactly 12 bytes
> later. so malloc seems to have some overhead, but it works.
> and just to be sure:
>
> memset(xa, 0, 10);
> memset(xb, 0, 10);
> snprintf(xb, 10, "%d %d", 9876, 543);
> snprintf(xa, 10, "%d %d", 1234, 567);
> puts(xa);
> puts(xb);
>
> outputs:
> """
> 1234 567
> 9876 543
> """
>
> all compiled with CFLAGS = -mmcu=${CPU} -O2 -Wall -g
> cvs version of libc, some weeks old msp430-gcc 3.2.3
>
> chris
>
>
>
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