Never mind about the STDLIBM.H that's for CCS's compiler, Hi-tech PICC has a malloc.c in its sources directory you would need to add. The malloc.c file has the free() and malloc() functions in it. -John --- In , "Bruce.J Sam" <persevreman@y...> wrote: > Thanks john, > But I couldn't found STDLIBM.H in the installation directory of the picc.Are there other method to solve? > Thanks again, > Bruce .J Sam. > john <j_funk1425@y...> wrote: > You need to include "STDLIBM.H" to use those functions. The compiler > is giving those errors because it doesn't know what those two > functions are without STDLIBM.H included. > > --- In , "Bruce.J Sam" <persevreman@y...> > wrote: > > I have writed a simple program like this: > > /* ******************************* */ > > #include <stdlib.h> > > > > void main(void) > > { > > unsigned char *ptr; > > > > ptr = (unsigned char *) malloc(sizeof(unsigned char)); > > free(ptr); > > } > > /* ***************************** */ > > This just used to test how to use malloc() and free() in PICC.But > after compiled,some error message appear: > > Error[000] : undefined symbols: > > Error[000] : _free (D:\MPLAB IDE\PICproject\Test\test.obj) > > Error[000] : _malloc (D:\MPLAB IDE\PICproject\Test\test.obj) > > I have doubt in why these error message appear.How to do > dynamic memory's program such use malloc() and free() in PICC? > > Best regards, > > Bruce .J Sam > --------------------------------- >

Thanks john,

But I couldn't found STDLIBM.H in the installation directory of the picc.Are there other method to solve?

Thanks again,

Bruce .J Sam.

john <j...@yahoo.com> wrote:

You need to include "STDLIBM.H" to use those functions. The compiler is giving those errors because it doesn't know what those two functions are without STDLIBM.H included. --- In p...@yahoogroups.com, "Bruce.J Sam" <persevreman@y...> wrote: > I have writed a simple program like this: > /* ******************************* */ > #include <stdlib.h> > > void main(void) > { > unsigned char *ptr; > > ptr = (unsigned char *) malloc(sizeof(unsigned char)); > free(ptr); > } > /* ***************************** */ > This just used to test how to use malloc() and free() in PICC.But after compiled,some error message appear: > Error[000] : undefined symbols: > Error[000] : _free (D:\MPLAB IDE\PICproject\Test\test.obj) > Error[000] : _malloc (D:\MPLAB IDE\PICproject\Test\test.obj) > I have doubt in why these error message appear.How to do dynamic memory's program such use malloc() and free() in PICC? > Best regards, > Bruce .J Sam

You need to include "STDLIBM.H" to use those functions. The compiler is giving those errors because it doesn't know what those two functions are without STDLIBM.H included. --- In , "Bruce.J Sam" <persevreman@y...> wrote: > I have writed a simple program like this: > /* ******************************* */ > #include <stdlib.h> > > void main(void) > { > unsigned char *ptr; > > ptr = (unsigned char *) malloc(sizeof(unsigned char)); > free(ptr); > } > /* ***************************** */ > This just used to test how to use malloc() and free() in PICC.But after compiled,some error message appear: > Error[000] : undefined symbols: > Error[000] : _free (D:\MPLAB IDE\PICproject\Test\test.obj) > Error[000] : _malloc (D:\MPLAB IDE\PICproject\Test\test.obj) > I have doubt in why these error message appear.How to do dynamic memory's program such use malloc() and free() in PICC? > Best regards, > Bruce .J Sam > > --------------------------------- >

I have writed a simple program like this:

/* ******************************* */

#include <stdlib.h>

void main(void)
{
unsigned char *ptr;

ptr = (unsigned char *) malloc(sizeof(unsigned char));
free(ptr);
}

/* ***************************** */

This just used to test how to use malloc() and free() in PICC.But after compiled,some error message appear:

Error[000]   : undefined symbols:
Error[000]   : _free (D:\MPLAB IDE\PICproject\Test\test.obj)
Error[000]   : _malloc (D:\MPLAB IDE\PICproject\Test\test.obj)

I have doubt in why these error message appear.How to do dynamic memory's program such use malloc() and free() in PICC?

Best regards,

Bruce .J Sam