I finally got my hands on a known-good board with a non-ARM JTAG target on
it, and verified that my code worked to at least do the initial reset and
IDCODE read. It's still very hacky (lots of debug output) but if anyone
with a CMSIS-DAP adapter and a known-good JTAG chain would like to give it
a try, clone this repo and check out the cmsis-dap-jtag branch:
https://github.com/myelin/openocd
openocd -d -f interface/cmsis-dap.cfg -c 'transport select jtag' -f
target/...
Especially awesome would be anyone who has a non-ARM target (FPGA, boundary
scan, other processor...) handy, and can verify further than just that the
IDCODE reads out properly, but anything would be good.
So far I've tested it with an LPC-Link II (with the latest CMSIS-DAP
firmware programmed in) against an Atmel ATMEGA32U4 target.
Cheers,
Phil
On Thu, Feb 25, 2016 at 3:57 AM, Spencer Oliver <s...@spen-soft.co.uk>
wrote:
> On 25 February 2016 at 09:38, Paul Fertser <fercer...@gmail.com> wrote:
> > Hey Spencer,
> >
> > On Thu, Feb 25, 2016 at 08:49:13AM +0000, Spencer Oliver wrote:
> >> If I recall the details CMSIS-DAP operates at the ADIv5 layer so from
> >> OpenOCD's point of view we still use the swd driver mode but change
> >> the actual adapter to JTAG mode.
> >>
> >> We should not need to implement the full jtag_interface. Try setting
> >> cmsis_dap_usg::swd_mode to false as a start.
> >
> > I'd disagree. If raw JTAG mode is implemented, CMSIS-DAP adapters
> > would become useful for all kind of OpenOCD work, including
> > heterogeneous JTAG chains, boundary scan, FPGA/CPLD configuration
> > etc. Adding just the ADIv5 JTAG mode won't buy us much, IMHO. Why
> > agree for less when we can get more? ;)
> >
>
> I agree that is a better overall solution, if someone has time to
> implement it then great.
>
> Spen
>
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