Heap problem of Demo example

Bin Li1

Hi Everyone,

I am currently learning the demo project example of TIRTOS. I am using concerto board (F28M35H52C1). I can sucessfully built the project and ran it. Now, I would like to add another IPC variable for the two processors. In "demo.h" file, I added another variable called "currentsensor" into the structure "TempMsg" as shown below. This change was made in "demo.h" in both M3 code and C28x code. I can sucessfully built the code. However, when I tried to run the M3 core, the program was paused and I got heap problems in Console as shown in the figure below. I tried several things, such as increased the SYS/BIOS heap size or increased the variable "numBlock" from 2 to10, but the problem was still there. Can anyone help for this problem ?

Many Thanks,

Bin

typedef struct TempMsg {
    MessageQ_MsgHeader hdr;
    Float temperatureF;
    Float temperatureC;
    Float currentsensor;
} TempMsg;

over 11 years ago

0 Emmanuel Trinidad - Alicea over 11 years ago

TI__Genius 10260 points

Hi Bin,

The issue is due bad memory alignment. Align = 0 causes SYS/BIOS to use the platform default alignment (8 in the case of the M3; 2 for the C28x). By adding your currentsensor variable, TempMsg changed the block size from 40 to 44 thus causing the error. Adding another variable to the TempMsg structure will change block size to 48, restoring alignment on the M3.

typedef struct TempMsg {
    MessageQ_MsgHeader hdr;
    Float temperatureF;
    Float temperatureC;
    Float currentsensor;
    Float dummy;
} TempMsg;

Here are some links to help out:

SYS/BIOS User's Guide (Section 6.8 Heap Implementations): http://www.ti.com/lit/ug/spruex3m/spruex3m.pdf

Heap Buffer API: http://software-dl.ti.com/dsps/dsps_public_sw/sdo_sb/targetcontent/bios/sysbios/6_35_04_50/exports/bios_6_35_04_50/docs/cdoc/index.html

Thanks,

-- Emmanuel

0 Bin Li1 over 11 years ago in reply to Emmanuel Trinidad - Alicea

Expert 1305 points

Hi Emmanuel,

Thanks for your reply. I tried to add more variables and it solved the problem.

Many Thanks,

Bin

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Heap problem of Demo example