The LPC4357 is a dual-core with ARM Cortex-M4 and Cortex-M0 cores, which are accessed via the following Debug Protocols:
By default winIDEA tries to connect to all available cores. When selecting the SWD Debug Protocol, winIDEA should connect only to Cortex-M4 core.
1. Open Hardware menu / CPU Options / SoC.
2. Make sure SWD Debug Protocol is selected.
3. Go to Cores / CortexM0 page.
4. Make sure the option Connect to core at session start is disabled.
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