SAVE MEMORY CONTENTS TO A FILE for STM32F3

[love-peace2001]

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]

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.

[love-peace2001]

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]

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.

[love-peace2001]

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]

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 FatFsIf 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

[love-peace2001]

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]

Posted on February 03, 2014 at 18:29I would know if it possible to export value showed in one of the memory (memory1,2,3,4) to a file 

[Tesla DeLorean]

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.

[love-peace2001]

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 ?