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RAM Usage with KDS+KSDK: report 20% used and region overflow

Question asked by Sylvain Viguier on Oct 13, 2015
Latest reply on Oct 26, 2015 by ZhangJennie

Hi There,

 

I am trying to get an idea of the RAM and Flash use of my program as I have recently bumped into a region overflow issue:

section .bss will not fit in region "m_data"

 

I am using the MK64FN1M0VLL12 uc with 256KB RAM and 1MB Flash.

I want to statically add an array which is 170*128*2=43520 bytes long.

From what I see in the print size before adding the array only 66560 Bytes are used in RAM so far.

Alas, I get a m_data region overflown by 31732 bytes when I add the array.

 

Below are code snippets and print size. What am I doing wrong?

 

Thanks a lot for your help,

S.

-----------------------------------------------

data.h:

extern uint16_t data_current_raw[MEASURES_MAX][BUFLEN];

 

data.c:

uint16_t data_current_raw[MEASURES_MAX][BUFLEN] = {{0}};

 

measure.c

#include "data.h"

#DEFINE MEASURES_MAX 170

#DEFINE BUFLEN 128

static uint16_t meas_data_all[MEASURES_MAX][BUFLEN] = {{0}};

(write important data in meas_data_all)

memcpy(data_current_raw, meas_data_all, sizeof(meas_data_all));

 

Here is the size print before adding data_current_raw:

 

Invoking: Cross ARM GNU Print Size

arm-none-eabi-size --format=sysv --totals "XXX.elf"

section              size        addr

.interrupts          1024           0

.flash_config          16        1024

.text              129536        1040

.ARM                    8      130576

.init_array             4      130584

.fini_array             4      130588

.interrupts_ram      1024   536805376

.data                1016   536806400

.bss                50172   536807416

.heap                1024   536870912

.stack               1024   536871936

.ARM.attributes        48           0

.debug_info        266651           0

.debug_abbrev       42800           0

.debug_aranges       9744           0

.debug_ranges       10288           0

.debug_macro       243827           0

.debug_line        133816           0

.debug_str        1898995           0

.comment              112           0

.debug_frame        32100           0

.debug_loc          48696           0

.stab                 156           0

.stabstr              387           0

Total             2872472

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