I believe that's someone's STM32 port of the CMSIS-DAP firmware. Here's
the most official looking version I could find :)
http://www.keil.com/pack/doc/CMSIS/DAP/html/index.html
Cheers,
Phil
On Wed, Feb 24, 2016 at 11:24 AM, Márton Miklós <martonmiklosq...@gmail.com>
wrote:
> FYI there is an "official documentation" out in the wild about the CMSIS
> DAP (which includes the JTAG mode):
> https://github.com/x893/CMSIS-DAP/tree/master/html
>
> I have also started implementing this stuff ~ year ago, but I have not
> finished it yet.
>
> Regards,
> Miklós Márton
>
> 2016-02-24 18:38 keltezéssel, Phillip Pearson írta:
>
> Weird coincidence... I was just looking at implementing JTAG support in
> the OpenOCD CMSIS-DAP driver last night. You want to look at the code in
> interface/Common/src/DAP.c and interface/Common/inc/DAP.h in the CMSIS-DAP
> code on https://github.com/mbedmicro/CMSIS-DAP -- there's a whole lot of
> high level JTAG stuff that's specific to ARM processors, but if you want
> low level JTAG access, there's these two:
>
> The DAP_SWJ_Sequence function (DAP command id 0x12, CMD_DAP_SWJ_SEQ in
> cmsis_dap_usb.c) will clock a sequence of bits out TMS (=SWDIO) so you can
> change TAP states.
>
> The DAP_JTAG_Sequence function (DAP command id 0x14, CMD_DAP_SWJ_SEQ in
> cmsis_dap_usb.c) will clock a sequence of bits out TDI and collect the
> response from TDO, while holding TMS high or low as specified in the info
> argument.
>
> Then in cmsis_dap_execute_command you'll need to implement the missing
> JTAG commands. I've done JTAG_TLR_RESET, and JTAG_PATHMOVE is pretty easy,
> so if you want to avoid duplicating effort you could start on JTAG_SCAN,
> which is the most complex one. If you look at the other JTAG interfaces
> (ulink.c, usbprog.c etc) there'll be a ton of code to work from.
>
> You should be able to get it working without changing anything in the
> jtag_interface struct... just change the cmsis_dap_transport line to
> include jtag and it'll become user selectable from config using 'transport
> select jtag'.
>
> static const char * const cmsis_dap_transport[] = { "swd", "jtag", NULL };
>
> Cheers,
> Phil
>
>
>
> On Wed, Feb 24, 2016 at 8:20 AM, Martin Pruscha <pruscha.mar...@gmail.com>
> wrote:
>
>> Hello Openocd devs!
>>
>> I would like to be able to use cmsis-dap with jtag transport.
>> However, only swd transport seems to be implemented.
>>
>> At what level should I implement the "choose jtag or swd" option?
>> The best place for that seems to be the tcl/target .cfg files, but there
>> seems to be no good way to choose the transport for a certain
>> adapter/interface yet.
>>
>> There also seems to be a lot of mixing of swd and jtag, for example the
>> ".swd" field in the "jtag_interface" struct. I am trying to clean this
>> up/remove this field and instead choose the driver/transport at a later
>> stage by user input from the cfg files.
>>
>> Regards
>>
>>
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