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Open source ARM Debugger
By Solderburns
I have an issue with the STLINK v2 ISOL connected to a STM32F407 micro controller when using OpenOCD (0.9.0) on Linux:

I want (or better need) to debug it using the JTAG transport. So what I did was using this configuration:
Code: Select all
source [find interface/stlink-v2.cfg]
transport select hla_jtag
source [find target/stm32f4x.cfg]
reset_config trst_only
I have no System Reset available on the board's connector, which is why it is trst_only.

The thing is, that it does not connect to the chip at all.

I wired VDD, GND, JNTRST, TMS, TCK, TDI, TDO (accoring to ST UM1075 chapter 4.2). Whenever I try to connect, it finally ends up with claiming the target voltage being too low (see debug log here:

However, connecting JNTRST and TDI to ground and using the SWD transport, it works without problems - also detecting a sufficient voltage (see debug log here:

BTW: I have perfect 3.3V on the supply pins when I measure the voltage with a multimeter.

When using the ST-Tool under Windows I also cannot connect using JTAG, whereas SWD has no problems.

Any idea what is going wrong here? What configuration am I missing?
By hsutherl
Weird. It almost sounds as if your STLiNK v2 ISOL has subtle issues. The code in your STM32F407 is not re-purposing the TDI or JNTRST pins?
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