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Using OpenOCD to debug KBox
Thomas Sarlandie edited this page Apr 28, 2018
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Note: this has been tested on Linux only at the moment.
KBox includes a 10 pin standardized Cortex debug connector. This connector allows us to connect a debugger and truly debug the code running on the board.
We recommend using a CMSIS-DAP compatible SWD/JTAG connector. The Armstart IBDAP-CMSIS-DAP is only $19 and widely available.
Follow the Armstart instructions to compile OpenOCD with CMSIS-DAP support. EDIT: Apparently Armstart disappeared. Backup of the instructions found here.
To run OpenOCD, simply type:
$ openocd -f openocd.cfg
Open On-Chip Debugger 0.10.0-dev-00191-gae8cdc1 (2016-01-16-20:05)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
Info : only one transport option; autoselect 'swd'
Info : add flash_bank kinetis k40.flash
adapter speed: 1000 kHz
none separate
cortex_m reset_config sysresetreq
adapter speed: 1000 kHz
srst_only separate srst_nogate srst_open_drain connect_deassert_srst
Info : add flash_bank kinetis pflash.0
Info : CMSIS-DAP: SWD Supported
Info : CMSIS-DAP: JTAG Supported
Info : CMSIS-DAP: Interface Initialised (SWD)
Info : CMSIS-DAP: FW Version = 1.0
Info : SWCLK/TCK = 1 SWDIO/TMS = 1 TDI = 1 TDO = 1 nTRST = 0 nRESET = 1
Info : CMSIS-DAP: Interface ready
Info : clock speed 1000 kHz
Info : SWD IDCODE 0x2ba01477
Info : k40.cpu: hardware has 6 breakpoints, 4 watchpoints
Info : MDM: Chip is unsecured. Continuing.
Now open a different terminal to flash or debug the program.
$ platformio run
[ ... building the .elf file ... ]
$ arm-none-eabi-objcopy -O binary .pioenvs/teensy31/firmware.elf
firmware.bin
$ telnet localhost 4444
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
Open On-Chip Debugger
> reset halt
MDM: Chip is unsecured. Continuing.
k40.cpu: target state: halted
target halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0x000001bc msp: 0x20008000
> flash write_image erase firmware.bin 0x0
auto erase enabled
Probing flash info for bank 0
flash configuration field erased, please reset the device
wrote 79872 bytes from file firmware.bin in 4.921926s (15.847 KiB/s)
>
>
> reset run
MDM: Chip is unsecured. Continuing.
$ arm-none-eabi-gdb .pioenvs/teensy31/firmware.elf
GNU gdb (GNU Tools for ARM Embedded Processors) 7.10.1.20151217-cvs
Copyright (C) 2015 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "--host=x86_64-unknown-linux-gnu --target=arm-none-eabi".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from .pioenvs/teensy31/firmware.elf...done.
(gdb) target remote localhost:3333
Remote debugging using localhost:3333
0x0000a534 in ILI9341_t3::waitTransmitComplete (this=0x1fff9d88, mcr=2149515264)
at .pioenvs/teensy31/ILI9341_t3/ILI9341_t3.h:254
254 uint32_t sr = KINETISK_SPI0.SR;
(gdb) break EncoderTestPage.cpp:25
Breakpoint 1 at 0x958: file src/EncoderTestPage.cpp, line 25.
(gdb) c
Continuing.
Note: automatically using hardware breakpoints for read-only addresses.
Breakpoint 1, EncoderTestPage::processEvent (this=0x1fff9e20, e=...) at src/EncoderTestPage.cpp:26
26 if (longClickTrigger && millis() > longClickTrigger) {
(gdb) p longClickTrigger
$1 = 0
(gdb) n
25 bool EncoderTestPage::processEvent(const TickEvent &e) {
(gdb) step
26 if (longClickTrigger && millis() > longClickTrigger) {
(gdb)
31 timer = e.getMillis();
(gdb) p timer
$2 = 5834
(gdb)
To load a firmware with GDB, simply use the load command:
(gdb) load
Loading section .text, size 0x125ac lma 0x0
Loading section .fini, size 0x4 lma 0x125ac
Loading section .ARM.exidx, size 0x8 lma 0x125b0
Loading section .data, size 0xe4c lma 0x125b8
Start address 0x0, load size 78852
Transfer rate: 14 KB/sec, 9856 bytes/write.
(gdb)