topic Re: Pinout for MCU-Link Pro to LPC832 in CMSIS-DAP debugging in LPC Microcontrollers

Pinout for MCU-Link Pro to LPC832 in CMSIS-DAP debugging

aaronm — Tue, 14 Feb 2023 07:02:51 GMT

Hi. I'm using a free-standing LPC832 - not part of any EVK - and the SWD connections as referenced in *1 work fine if I'm using the J-Link debugger. However, if I debug with LinkServer and the MCU-Link Pro, with the same pin connections, I get the following:

02: Failed on Connect
Target marked as not debuggable.
Probe(0): Connected&Reset
Remote communication error. Target disconnected.: Connection reset by peer.

Does the stand-alone LPC832 not support CMSIS-DAP debugging? Are my pins connected incorrectly? I could flash the MCU-Link Pro with Segger firmware and use it as another J-Link debug probe, but I'd rather have two types of probes.

Thanks

*1: https://community.nxp.com/t5/LPC-Microcontrollers/Pinout-and-debugger-configuration-for-reliable-SWD-on-LPC810/m-p/693794

Re: Pinout for MCU-Link Pro to LPC832 in CMSIS-DAP debugging

frank_m — Tue, 14 Feb 2023 07:58:22 GMT

Some debug probes have configurable options to enable/disable the 3.3V supply to the target through the debug adapter.
Perhaps this is your problem ?

Re: Pinout for MCU-Link Pro to LPC832 in CMSIS-DAP debugging

aaronm — Tue, 14 Feb 2023 23:52:35 GMT

I figured it out: the TDO pin needs to be connected for CMSIS-DAP debugging. Evidently, this is not necessary with J-Link debugging - as I've experienced in actual practice. The MCU-LINK Pro schematic helped. See page 4, "Cortex Debug (SWD/JTAG) interface."

https://www.nxp.com/downloads/en/schematics/MCU-LINK-SCH.pdf

Re: Pinout for MCU-Link Pro to LPC832 in CMSIS-DAP debugging

brendonslade — Wed, 15 Feb 2023 00:30:50 GMT

Good point, but MCU-Link (base model) cant power a target. MCU-Link Pro can.