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LP-MSPM0L1306: Ram usage size becomes huge when using malloc().

Part Number: LP-MSPM0L1306
Other Parts Discussed in Thread: MSPM0L1306, SYSCONFIG

Tool/software:

Hi,

I use reference project "gpio_toggle_output_LP_MSPM0L1306_nortos_ticlang" from sdk 2.6.0.5.

before I add malloc(). SRAM only uses 256B.

after I add malloc(). SRAM becomes 2319.

I only allocate 100B memory as below.

    uint16_t *tmpbuf= (uint16_t *)malloc(100);;
if i use below, it doesn't increase.
    uint16_t tmpbuf[100];
below is the source code. by the way, it doesn't matter with ARM compiler optimization. I change different optimization and it doesn't help.

/*
 * Copyright (c) 2023, Texas Instruments Incorporated
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * *  Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * *  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * *  Neither the name of Texas Instruments Incorporated nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "ti_msp_dl_config.h"
#include <stdlib.h>
#include <string.h>
/* This results in approximately 0.5s of delay assuming 32MHz CPU_CLK */
#define DELAY (16000000)
uint16_t tmptmp;
int main(void)
{
    uint16_t i=0;
    uint16_t *tmpbuf= (uint16_t *)malloc(100);;
    //uint16_t tmpbuf[100];
            if(!tmpbuf){
            free(tmpbuf);
                    DL_GPIO_setPins(GPIO_LEDS_PORT,
            GPIO_LEDS_USER_LED_1_PIN | GPIO_LEDS_USER_LED_2_PIN |
                GPIO_LEDS_USER_LED_3_PIN | GPIO_LEDS_USER_TEST_PIN);
                __BKPT(0);
        }
        
#if 1  // Ammore Test
       memset(tmpbuf,0x00,100);

       for(i=0;i<100;i++)
       {
           tmpbuf[i] = tmpbuf[0] + 1;
       }
#endif

    /* Power on GPIO, initialize pins as digital outputs */
    SYSCFG_DL_init();

    /* Default: LED1 and LED3 ON, LED2 OFF */
    DL_GPIO_clearPins(GPIO_LEDS_PORT, GPIO_LEDS_USER_LED_2_PIN);
    DL_GPIO_setPins(GPIO_LEDS_PORT, GPIO_LEDS_USER_LED_1_PIN |
                                        GPIO_LEDS_USER_LED_3_PIN |
                                        GPIO_LEDS_USER_TEST_PIN);

    while (1) {
        /*
         * Call togglePins API to flip the current value of LEDs 1-3. This
         * API causes the corresponding HW bits to be flipped by the GPIO HW
         * without need for additional R-M-W cycles by the processor.
         */
          if((i++)<=1024){
            uint16_t tmp = i;

            //temp[i]=tmp++;
            tmpbuf[i] = tmp++;
            
            __asm("NOP");
        }else{
            i=0;
           // temp[i]=i;
            tmpbuf[i] = i;
            __asm("NOP");
        }
        delay_cycles(DELAY);
        DL_GPIO_togglePins(GPIO_LEDS_PORT,
            GPIO_LEDS_USER_LED_1_PIN | GPIO_LEDS_USER_LED_2_PIN |
                GPIO_LEDS_USER_LED_3_PIN | GPIO_LEDS_USER_TEST_PIN);
                tmptmp = tmpbuf[i];
    }
}

any idea?

BR,

frank

  • Referencing malloc causes a reference to the (RAM) section ".sysmem", which is created by the linker to be of size "--heap_size".

    If there is no reference to .sysmem, it is "garbage collected" by the linker and so takes up no RAM.

    If you don't need so much heap, you can change it in "Build Settings->Build->Linker->Basic->Heap Size" or (I think) in Sysconfig.