Hello! After programming the LPC1778 chip with a J-Link debugger, the target chip cannot be connected. This same fault has happened on two distinct circuit boards in my possession.
I confirm the issue is not caused by the programmed application code. The data I programmed is full-chip random values, and programming the exact same random dataset using a different programming tool does not produce this connectivity issue.
The initial connection and programming process complete normally without any error alerts. After power cycling the board post-programming, all communication with the hardware fails. The connection log is listed below:
Connecting ...
- Connecting via USB to probe/ programmer device 0
- Probe/ Programmer firmware: J-Link V9 compiled May 7 2021 16:26:12
- Probe/ Programmer S/N: 69401860
- Device "LPC1778" selected.
- Target interface speed: 4000 kHz (Fixed)
- VTarget = 3.283V
- Failed to attach to CPU. Trying connect under reset.
- ERROR: Failed to connect.
Could not establish a connection to target.
General troubleshooting guide: https://kb.segger.com/J-Link_Troubleshooting
- ERROR: Connect failed
Addtionally, I capture waveforms with a logic analyzer, the DP port of the SWD interface works normally, whereas all AP accesses result in ACK FAULT responses.
