This is a step-by-step to let you debug your board using OpenOCD:
First of all you need to install CMSIS-DAP firmware:
https://acassis.wordpress.com/2013/03/17/changing-frdm-kl25z-boards-firmware-to-become-cmsis-dap-compatible/
You need to install libusb version 1.0:
$ sudo apt-get install libusb-1.0-0-dev
Download and compile OpenOCD with CMSIS-DAP support:
$ git clone https://github.com/TheShed/OpenOCD-CMSIS-DAP.git $ cd OpenOCD-CMSIS-DAP $ git checkout -b cmsis origin/cmsis-dap $ ./bootstrap $ ./configure --enable-maintainer-mode --enable-cmsis-dap $ make $ sudo make install
Time to run OpenOCD:
# openocd -c "interface cmsis-dap" -f tcl/target/kl25.cfg Open On-Chip Debugger 0.7.0-dev-g1d8f0c1 (2013-03-18-19:24) Licensed under GNU GPL v2 For bug reports, read http://openocd.sourceforge.net/doc/doxygen/bugs.html Info : only one transport option; autoselect 'cmsis-dap' Info : CMSIS-ADI: cmsis_dap_select Info : CMSIS-DAP: cmsis_dap_swd_init Info : kernel driver active Info : kernel driver now detached. Info : CMSIS-DAP: SWD Supported Info : CMSIS-DAP: Interface Initialised (SWD) cortex_m3 reset_config sysresetreq adapter speed: 50 kHz Info : CMSIS-DAP: cmsis_dap_init Info : CMSIS-DAP: FW Version = 1.0 Info : CMSIS-DAP: Packet Size = 64 Info : CMSIS-DAP: Packet Count = 32 Info : SWCLK/TCK = 0 SWDIO/TMS = 1 TDI = 0 TDO = 0 nTRST = 0 nRESET = 1 Info : CMSIS-DAP: cmsis_dap_reset_link Info : DAP_SWJ Sequence (reset: 50+ '1' followed by 0) Info : DAP Read IDCODE Info : CMSIS-DAP: Interface ready Info : clock speed 50 kHz Info : CMSIS-ADI: cmsis_dap_init Info : CMSIS-ADI: cmsis_dap_queue_idcode_read Info : CMSIS-ADI: cmsis_dap_queue_dp_read 00 Info : 0bc11477 Info : IDCODE 0x0bc11477 Info : CMSIS-ADI: cmsis_dap_queue_ap_abort START... Info : CMSIS-ADI: cmsis_dap_queue_dp_read 04 Info : 00000040 Info : CMSIS-ADI: cmsis_dap_queue_dp_write 04 00000020 Info : CMSIS-ADI: cmsis_dap_queue_dp_read 04 Info : 00000040 Info : CMSIS-ADI: cmsis_dap_queue_dp_write 04 50000000 Info : CMSIS-ADI: cmsis_dap_queue_dp_read 04 Info : f0000040 Info : CMSIS-ADI: cmsis_dap_run Info : CMSIS-ADI: cmsis_dap_queue_dp_read 04 Info : f0000040 Info : CMSIS-ADI: cmsis_dap_queue_dp_write 08 00000000 Info : CMSIS-ADI: cmsis_dap_queue_ap_read 00 Info : CMSIS-ADI: cmsis_dap_queue_dp_write 08 00000000 Info : 03000040 Info : CMSIS-ADI: cmsis_dap_queue_ap_read 04 Info : ddfdffff Info : CMSIS-ADI: cmsis_dap_queue_dp_write 08 000000f0 Info : CMSIS-ADI: cmsis_dap_queue_ap_read f4 Info : CMSIS-ADI: cmsis_dap_queue_dp_write 08 000000f0 Info : 00000000 Info : CMSIS-ADI: cmsis_dap_queue_ap_read f8 Info : f0002003 Info : CMSIS-ADI: cmsis_dap_queue_ap_read fc Info : 04770031 Info : CMSIS-ADI: cmsis_dap_queue_dp_write 08 00000000 Info : CMSIS-ADI: cmsis_dap_queue_ap_write 00 a2000012 Info : CMSIS-ADI: cmsis_dap_queue_dp_write 08 00000000 Info : CMSIS-ADI: cmsis_dap_queue_ap_write 04 e000ed00 Info : CMSIS-ADI: cmsis_dap_queue_ap_read_block 01 Info : CMSIS-ADI: cmsis_dap_run Info : CMSIS-ADI: cmsis_dap_queue_ap_write 04 e0002000 Info : CMSIS-ADI: cmsis_dap_queue_ap_read_block 01 Info : CMSIS-ADI: cmsis_dap_run Info : CMSIS-ADI: cmsis_dap_queue_ap_write 04 e0001000 Info : CMSIS-ADI: cmsis_dap_queue_ap_read_block 01 Info : CMSIS-ADI: cmsis_dap_run Info : kl25.cpu: hardware has 2 breakpoints, 2 watchpoints END...
Now you can debug the FRDM board with openocd normally and even integrated on Eclipse.
That’s all folks, good luck!
UPDATE: After some more tests I noticed the debugging using GDB is not completely functional, then the best approach will be connecting to OpenOCD over telnet at port 4444 and execute the commands to access registers and memory.
