gdb - Need help debugging my bare metal Cortex-m3 system -


i trying setup bare-metal environment cortex-m3. first hands-on arm. hardware-wise, using stm32l-discovery board. toolchain-wise, using gnu toolchain (found on internet, readily-compiled win7). debuggin-wise, using gnu gdb (insight) , openocd on st_link on discovery kit.

a brief explanation of trying on m3... trying write startup routine in assembly, low-level initialisation in c , main() routine in c. write linker script myself. purposes of doing these go low-level , understand basics...

the system initialisation routines (clock setup, core voltage setup etc) using c file generated clock tool provided stmicroelectronics.

attached zip: source/object files here

startup.s:

  • setup vector table in rom.
  • reset_handler branch lowlevelinit.c
  • after return lowlevelinit(), carry out copying of code/data rom ram.
  • after finish rom2ram copy, branch main

lowlevelinit.c:

  • setup vector table in ram.
  • call systeminit() setup clock , core voltage.
  • remap memory prepare running of main code ram

main.c:

  • setup gpio port b output mode
  • set pb6 , pb7 1 turn on leds attached
  • go endless loop

the compilation , linking went ok , return no errors.. did objdump on .elf , sections address looked ok.

i use objcopy .hex elf , flashed hex board using stm32 st-link utility , downloading looks ok.

however, on reset, leds still off... :(

when try debug using gdb-insight , openocd. openocd can connect board. insight can connect openocd gdb server.

but not know how proceed here debug program... did 'load' in gdb-console , realised 'start address' odd value (0x80000f7)!!

i realised .rambss output section (.bss equivalent) has got lma automatically set vma (ram)... how set section vma-only?

i have attached files on zip , hope kind answer of queries , take little time debug program...

  1. the start address in insight location set in linker script @ entry(location)?? showing odd-value address because reset_handler .thumb_func??

  2. i know how use insight debug on simulator mode in general when connect insight physical board, , load elf board, how insight sync free-running board? how insight halt board @ entry(location) after board power up?

thank much


Comments

Post a Comment

Popular posts from this blog

apache - Remove .php and add trailing slash in url using htaccess not loading css -

i have add following code htaccess file removing .php extension , add trailing slash urls. worked fine reduced page loading speed , css code not loading @ all. pages ugly. please help rewriteengine on rewritebase / ## hide .php extension snippet # externally redirect /dir/foo.php /dir/foo rewritecond %{the_request} ^[a-z]{3,}\s([^.]+)\.php [nc] rewriterule ^ %1/ [r,l] # add trailing slash rewritecond %{request_filename} !-f rewritecond %{request_uri} !/$ rewriterule . %{request_uri}/ [l,r=301] # internally forward /dir/foo /dir/foo.php rewritecond %{request_filename} !-d rewritecond %{request_filename}.php -f rewriterule ^(.*?)/?$ $1.php [l] we can rewrite urls using .htaccess files. before writing in .htaccess files need verify kind of server using. can check server adding a <?php phpinfo(); ?> in php page. ensure mod_rewrite module enabled in apache server. can identified checking phpinfo included page. common methods used url rewriting follows ...
Read more

javascript - jQuery show full size image on click -

pretty self explanatory not workking . i want display full image when user click on image... yes know there tons of plugins but i want keep simple. any idea ? css : .full { display: none; width: 500px; height: 500px; margin-left: 100px; margin-top: -300px; position: fixed; background-color: #f00; z-index: 6; } .thumbnail { width: 50px; height: 50px; } html: <img class="thumbnail" src="http://4.bp.blogspot.com/-uhbdp2esxng/txneptvi92i/aaaaaaaaaky/upfqis7zto0/s1600/rihanna-wallpaper.jpg"> jquery: $(document).ready(function() { $('.thumbnail').on('click', function() { var img = $('<img />',{src:this.src,'class':'full'}); $('.full').html(img).show(); console.log('done!'); }); }); try looking how jquery works. $(document).ready(function() { $('.thumbnail').on('click', function(...
Read more