Memory alocation

George,

It would help to tell us which processor this is, and it sounds like it does not belong in the C64x Single Core Forum. In fact, it sounds like a CodeGen question so we will have it moved to the Compiler forum for the best chance at a good and complete answer.

If malloc returns 0, then your -heap specification does not give you enough memory space. If your heap is 0x08000 (32KB), for example, and you try to allocate 0x54600 (345KB), then you should expect malloc to fail. Make -heap large enough for all the buffers you might allocate, and you should get better results. But make sure it is in external memory unless you have a very large internal memory block in the device you are using.

DSP/BIOS and SYS/BIOS have additional heap-creation features and heap-usage functions. Look into those if you would like to have a fast heap in L2 and a large heap in external memory.

You can allocate an array to use, but be careful to place it in a memory section that has enough room. You have three choices for a static allocation:

char FrmBuf[480][720];  // this works if aggregate objects are allocated in .far and .far is in external memory

far char FrmBuf[480][720];  // this works if .far is in external memory

#pragma DATA_SECTION( FrmBuf, "mySection" );
char FrmBuf[480][720];  // this requires you to add mySection to your linker command file so this buffer will be allocated in external memory

Regards,
RandyP

If you need more help, please reply back. If this answers the question, please click  Verify Answer  , below.

Thanks for the answer.

I do not understand how to change my tcf file and add mySection to the linker command file and then buffer[480][720] allocated to the external memory. I have no idea how to change this.Could you help me ? I post the tcf file. Thanks

Regards

George

/** ============================================================================
 *  @file   FireDetect.tcf
 *
 * 
 *  ============================================================================
 */


/*  ============================================================================
 *  Load generic DSP/BIOS Link configuration
 *  ============================================================================
 */
utils.importFile("dsplink-omap3530-base.tci") ;
utils.importFile("dsplink-iom.tci") ;
utils.importFile("dsplink-zcpydata-swi.tci");
utils.importFile("dsplink-dio.tci") ;
utils.importFile("FireDetect.tci") ;

/*  ============================================================================
 *  Set all code and data sections to use DDR2
 *  ============================================================================
 */
bios.setMemCodeSections(prog, DDR2) ;
bios.setMemDataNoHeapSections(prog, DDR2) ;
bios.setMemDataHeapSections(prog, DDR2) ;

/*  ============================================================================
 *  MEM : Global
 *  ============================================================================
 */
prog.module("MEM").BIOSOBJSEG = DDR2 ;
prog.module("MEM").MALLOCSEG  = DDR2 ;

/*  ============================================================================
 *  TSK : Global
 *  ============================================================================
 */
prog.module("TSK").STACKSEG = DDR2 ;

/*  ============================================================================
 *  Generate cdb file...
 *  ============================================================================
 */
if (config.hasReportedError == false) {
    prog.gen() ;
}

We need more information in order to point you in the right direction:

Which device are you using?
Which version of CCS are you using?
Which version of DSP/BIOS are you using?

Regards,
RandyP

Thanks for the answer!!

I am not using CCS.  I compile my code under linux ubuntu 11.10 using the appopriate make files and the Texas Instrument  tools. Then my application run in a igepv2 board which has an ARM Cortex A8 OMAP3530 processor (GPP) and TMS320C64x DSP processor. In addition , the DSP/BIOS I am using is 5.xx (bios_5_41_04_18) version.

Regards

George