SAVE MEMORY CONTENTS TO A FILE for STM32F3

love-peace2001 · ‎2014-01-29

Posted on January 29, 2014 at 17:00

Hi all;

I'm working with the discoveryF3 board, i'm using the ST-Link debugger.

I want to save two float arrays into a file when debugging.

My IDE is µVision4.

I found that the command ''save'' can do that but when i used it, i have wrong values.

Someone has an another technique to this stuff.

Thanks in advance

Tesla DeLorean · ‎2014-01-29

Posted on January 29, 2014 at 17:39

SAVE is pretty much the way to do this, it outputs Intel HEX format which complicates post processing a little. Then again you're using float's which should be decodable by a Windows based compiler or otherwise using the IEEE-754 format.

Other methods would perhaps to be save it onto an SD card attached to the system, or stream out via the serial port in a manner/format that suits you.

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love-peace2001 · ‎2014-01-30

Posted on January 30, 2014 at 13:52

Thank you clive1 for your quick response.

what about ''fopen'' and ''fwrite'' ? we can't use them to open and write into a file ?

Tesla DeLorean · ‎2014-01-30

Posted on January 30, 2014 at 16:37

what about ''fopen'' and ''fwrite'' ? we can't use them to open and write into a file ?

Where would such a file go, and what code do you have to support that operation? This is embedded, unless you've implemented some file system or OS it's not happening.

You could output data via a serial port, or the SWV (View -> Serial Windows -> Debug (printf) Viewer) on the PB3 pin with SB10 bridged.

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love-peace2001 · ‎2014-01-30

Posted on January 30, 2014 at 17:39

''unless you've implemented some file system''

How can i implement file system ? it will be great.

''You could output data via a serial port'': yes i have tried to do that but no success, the communication works but when i send or receive data, i get wrong values so i dropped.

Ideally, i want to store my two arrays into a file and then plot them with excel for example.

Tesla DeLorean · ‎2014-01-30

Posted on January 30, 2014 at 19:59

Not sure why you have a problem with serial. Remember the STM32 uses CMOS levels, and won't connect directly to RS232 devices. You might want to look at USB-To-CMOS Serial type devices (FTDI, SiLabs, Prolific, etc)

File systems, on an STM32F3-Discovery you'd had to add an SD card socket/interface, add code to support that, and then add a file system like FatFs

If serial is a challenge, consider using the SWV

http://www.keil.com/download/files/swv_on_cortex-m3.pdf

http://www.keil.com/download/files/labst.pdf

It works on the ST-LINK used on the STM32F3-DISCO board, you just need to bridge SB10 on the back to get the pin connectivity

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love-peace2001 · ‎2014-02-03

Posted on February 03, 2014 at 18:26

Hi again,

Thanks you clive1 for your help, i appreciate it.

I use the SWV it works fine for simple data like printf(''hello word'').

But when i want to print my two float arrays, i can't get all my data,my arrays are both 1024 samples, it jumps some value and i don't know why, for example it shows some thing like this:

k=0 MES_1: -0.483102 MES_2: 0.347957

k=1 MES_1: -0.585388 MES_2: -0.821821

k=2 MES_1: -0.585826 MES_2: -0.821255

k=3 MES_1: -0.586605 MES_2: -0.819777

k=4 MES_1: -0.586402 MES_2: -0.819633

k=5 MES_1: -0.586548 MES_2: -0.821310

k=6 MES_1: -0.586817 MES_2: -0.821821

k=7 MES_1: -0.586755 MES_2: -0.821742

k=8 MES_1: -0.588197 MES_2: -0.819091

k=9 MES_1: -0.588505 MES_2: -0.818651

k=10 MES_1: -0.588773 MES_2: -0.817754

k=11 MES_1: -0.589459 MES_2: -0.823334

k=12 MES_1: -0.589924 MES_2: -0.818838

k=13 MES_1: -0.592064 MES_2: -0.820421

k=14 MES_1: -0.590832 MES_2: -0.817722

k=15 MES_1: -0.591669 MES_2: -0.816614

k=16 MES_1: -0.592894 MES_2: -0.816938

k=17 MES_1: -0.594940 MES_2: -0.815876

k=18 MES_1: -0.595303 MES_2: -0.814116

k=19 MES_1: -0.596574 MES_2: -0.814893

k=20 MES_1: -0.597424 MES_2: -0.814350

k=21 MES_1: -0.598700 MES_2: -0.813246

k=22 MES_1: -0.599896 MES_2: -0.812544

k=23 MES_1: -0.601454 MES_2: -0.813172

k=24 MES_1: -0.602724 MES_2: -0.810391

k=25 MES_1: -0.602640 MES_2: -0.811990

k=26 MES_1: -0.604783 MES_2: -0.810818

k=27 MES_1: -0.605809 MES_2: -0.808267

k=28 MES_1: -0.608684 MES_2: -0.808539

k=29 MES_1: -0.609863 MES_2: -0.806906

k=30 MES_1: -0.609863 MES_2: -0.805966

k=31 MES_1: -0.611337 MES_2: -0.807800

k=32 MES_1: -0.614956 MES_2: -0.803744

k=33 MES_1: -0.615910 MES_2: -0.802969

k=34 MES_1: -0.616941 MES_2: -0.804142

k=35 MES_1: -0.619237 MES_2: -0.801086

k=36 MES_1: -0.620757 MES_2: -0.799753

k=37 MES_1: -0.625475 MES_2: -0.802851

k=38 MES_1: -0.624527 MES_2: -0.798632

k=39 MES_1: -0.626367 MES_2: -0.795911

k=40 MES_1: MES_1: -0.521140 MES_2: 0.329964

k=233 MES_1: -0.510823 MES_2: 0.336236

k=234 MES_1: -0.503895 MES_2: 0.334139

k=235 MES_1: -0.492707 MES_2: 0.340790

k=236 MES_1: -0.480857 MES_2: 0.345976

k=237 MES_1: -0.470579 MES_2: 0.351589

k=238 MES_1: -0.461573 MES_2: 0.355391

k=239 MES_1: -0.450505 MES_2: 0.356636

k=240 MES_1: -0.441443 MES_2: 0.350977

k=241 MES_1: -0.430641 MES_2: 0.366206

k=242 MES_1: -0.425337 MES_2: 0.352911

k=243 MES_1: -0.411351 MES_2: 0.367043

k=244 40 MES_1: 0.321546 MES_2: -0.211932

..........................

........................

Do you have an idea what would be the problem ? i miss some configuration of the Trace ?

Thanks in advance

love-peace2001 · ‎2014-02-03

Posted on February 03, 2014 at 18:29

I would know if it possible to export value showed in one of the memory (memory1,2,3,4) to a file

Tesla DeLorean · ‎2014-02-03

Posted on February 03, 2014 at 18:36

The SWV implementation has a finite buffer in the ST-LINK (J-LINK not much better), you might want to stop periodically. Serial is better for this because you can use flow-control.

If you copy (or have) your memory buffers in a known location like 0x20003000 you can SAVE that buffer. SAVE might also recognize symbols, although I've not used it in that fashion.

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love-peace2001 · ‎2014-02-03

Posted on February 03, 2014 at 22:43

And then how can i convert the Hex to float? do you know a software tool that can do this please ?