Re: [OpenOCD-user] Flashing STM32f1 with Segger JLink problems

[Leonardo S. d. S. <leo...@gm...>]

Hello Tomas,

Thanks for taking the time to test this.


On Tue, Apr 4, 2017 at 1:08 PM, Tomas Vanek <to...@us...>
wrote:

> On 02.04.2017 17:48, Leonardo Sabino dos Santos wrote:
>
>> Looking at the NRST line with a scope while OpenOCD starts, without
>> connect_assert_srst I see 3 reset pulses of ~60ms; with connect_assert_srst
>> I see a single pulse of ~11 ms.
>>
> It is strange. There should be only one reset pulse.


Never mind that. I forgot to mention that I was running OpenOCD inside
Eclipse, which starts a gdb session and programs the Flash automatically,
so the extra resets must come from that.



> Could you add
>
> $_TARGETNAME configure -event reset-assert-post { mdw 0xe000edfc }
>
> to your cfg and test again? I suspect write to DEMCR is not effective in
> time of SRST deasserting, some
> extra SWCLK pulses may solve it. No idea why the problem appears only with
> connect_assert_srst.


Tested it. It didn't make a difference. Here is the mdw output in case it's
relevant (read result is the same with or without connect_assert_srst):

Debug: 719 396 cortex_m.c:583 cortex_m_halt(): target->state: reset
Debug: 720 396 command.c:143 script_debug(): command - ocd_command
ocd_command type ocd_stm32f1x.cpu invoke-event reset-assert-post
Debug: 721 396 command.c:143 script_debug(): command - ocd_stm32f1x.cpu
ocd_stm32f1x.cpu invoke-event reset-assert-post
Debug: 722 396 target.c:4313 target_handle_event(): target: (0)
stm32f1x.cpu (cortex_m) event: 10 (reset-assert-post) action:  mdw
0xe000edfc
Debug: 723 397 command.c:143 script_debug(): command - ocd_command
ocd_command type ocd_mdw 0xe000edfc
Debug: 724 397 command.c:143 script_debug(): command - mdw ocd_mdw
0xe000edfc
Debug: 726 397 cmsis_dap_usb.c:599 cmsis_dap_swd_run_queue(): Executing 5
queued transactions
Debug: 727 397 cmsis_dap_usb.c:622 cmsis_dap_swd_run_queue(): DP write reg
8 0
Debug: 728 397 cmsis_dap_usb.c:622 cmsis_dap_swd_run_queue(): AP write reg
4 e000edfc
Debug: 729 397 cmsis_dap_usb.c:622 cmsis_dap_swd_run_queue(): AP write reg
0 a2000022
Debug: 730 398 cmsis_dap_usb.c:622 cmsis_dap_swd_run_queue(): AP read reg c
0
Debug: 731 398 cmsis_dap_usb.c:622 cmsis_dap_swd_run_queue(): DP read reg c
0
Debug: 732 401 cmsis_dap_usb.c:677 cmsis_dap_swd_run_queue(): Read result:
1000501
Debug: 733 401 cmsis_dap_usb.c:677 cmsis_dap_swd_run_queue(): Read result:
1000501
User : 734 401 command.c:544 command_print(): 0xe000edfc: 01000501


This issue could be related to my debug adapter. Maybe you can recommend a
good inexpensive CMSIS-DAP adapter? I use a pair of IBDAP from Armstart,
very inexpensive and generally work fine, but I guess they were never
popular and Armstart seems not to exist anymore (website disappeared and
Facebook page completely inactive).


Regards,

Leonardo