CC3200 Launchpad SWD

[ciaranmaca]

Hi,

I have JTAG connectivity working well with my CC3200 Launchpad (FTDI 2232 based debug connectivity). I want to switch to SWD to save pins. How can I do this?

I tried adding ‘transport select swd’ to one of my scripts but it also needed me to switch the jtag tap commands to ‘swd’  (and of course set the SOP settings right on my board). But I get errors in openocd. “ession transport is “swd” but your config requires JTAG” etc.

Any one done this?

Ciarán

 

[support]

Hi,

Have you tried explicitly selecting the SWD transport in the VisualGDB Project Properties window?

[ciaranmaca]

Hi,

No, that didn’t work either. I get the following error:

Ciarán

 

^error,msg=”-var-assign: Could not assign expression to variable object”
-exec-continue
^error,msg=”Warning:\nCannot insert breakpoint 1.\nCannot access memory at address 0x20004ac8\n”

— GDBServer output —
Open On-Chip Debugger 0.9.0 (2016-09-01) [https://github.com/sysprogs/openocd]

Licensed under GNU GPL v2

For bug reports, read

http://openocd.org/doc/doxygen/bugs.html

adapter speed: 1000 kHz

jtag

adapter_nsrst_delay: 100

jtag_ntrst_delay: 100

cortex_m reset_config sysresetreq

VisualGDB_OpenOCD_Ready

Info : clock speed 1000 kHz

Error: JTAG scan chain interrogation failed: all zeroes

Error: Check JTAG interface, timings, target power, etc.

Error: Trying to use configured scan chain anyway…

Error: cc3200.jrc: IR capture error; saw 0x00 not 0x01

Warn : Bypassing JTAG setup events due to errors

Info : accepting ‘gdb’ connection on tcp/63987

undefined debug reason 7 – target needs reset

Error: Target not examined yet

Error: Target not examined yet

Error: Target not examined yet

Error: Target not examined yet

Error: Target not examined yet

Error: JTAG scan chain interrogation failed: all zeroes

Error: Check JTAG interface, timings, target power, etc.

Error: Trying to use configured scan chain anyway…

[support]

Hi,

We have rechecked the OpenOCD support for FTDI and CC3200 and it looks like the current FTDI configuration files do not support the SWD signals yet.

There are third-party articles describing how to define them, but we have not retested those instructions. We would expect the OpenOCD maintainers to update the configuration files in the next few releases.

Also if you encounter errors like “The current target requires JTAG”, please try switching OpenOCD to manual configuration mode and replacing the cc3200.cfg script with the cc32xx.cfg.

If this does not help, please let us know.

[ciaranmaca]

Hi,

Thanks for the reply. Yes, I set the target to cc32xx.cfg and that got me partly there. I still hard an error about signal definitions. But taking inspiration from the gcc scripts in the tools folder of the TI SDK for CC3200 I added these two lines to the interface/ftdi/cc3200lp.cfg script:

# Add for SWD
ftdi_layout_signal SWD_EN -ndata 0x0080
ftdi_layout_signal SWDIO_OE -data 0x0008

And hurray, it works.

Thanks for your help. I consider the issue resolved.

Ciarán

[Author]

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