ARM-USB-OCD-H / ARM-JTAG-SWD OpenOCD Issues

[joe]

We're working on programming an STM32 via the ARM-USB-OCD-H + ARM-JTAG-SWD using OpenOCD.

We're having trouble under a variety of scenarios, and I wanted to see if my understanding of the pinouts are correct.

My OpenOCD .cfg:

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source [find interface/ftdi/olimex-arm-usb-ocd-h.cfg]
source [find interface/ftdi/olimex-arm-jtag-swd.cfg]
source [find target/stm32l4x.cfg]
# use hardware reset
reset_config srst_only srst_nogate

To reduce confusion, I've reduced it to only the pins I think are *required* for SWD debugging/programming.

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Pin Out

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          [Olimex]            (Adapter)               STM32

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# 3  - [TTRST_N]    (TRST)                 nRST

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# 5  - [TTDI]          (TDI)

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# 7  - [TTMS]         (TMS_SWDIO)      SWIO

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# 9  - [TTCK]         (TCK)                   SWCLK

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# 11 - [TRTCK]      (RTCK)         

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# 13 - [TTDO]        (TDO_SWO)       

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# 15 - [TSRST_N]   (SRT)
# 20 -[GND]     (GND)          GND

I've connected nRST, SWIO, SWCLK, and GND, and the devide to be programmed is self powered.
Am I missing something in terms of the pinouts, or is my translation of pin functions incorrect?

Thank you,
Joe

[LubOlimex]

You need to connect VCC, it is used to "sense" the voltage of the target.

[joe]

Thank you - I've tried that as well (using pin 2), but no luck.
I also tried switching the resets around and tried reset_config trst_only since I'm only connecting to what I believe is trst -> nRST

I continue to receive the following message:

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Info : FTDI SWD mode enabled
Info : DEPRECATED target event trace-config; use TPIU events {pre,post}-{enable,disable}
srst_only separate srst_nogate srst_open_drain connect_deassert_srst

Info : clock speed 500 kHz
Error: Error connecting DP: cannot read IDR
in procedure 'program'
** OpenOCD init failed **
shutdown command invoked


[LubOlimex]

TRST/nRST is an optional signal, you can skip connecting it.

On the contrary SRST/SRT is mandatory and should be connected (pin #15 of big connector that is routed to pin #10 of small connector).