Arm Cortex-M LPC4357: Debugging M4 core via SWD Debug Protocol

The LPC4357 is a dual-core with ARM Cortex-M4 and Cortex-M0 cores, which are accessed via the following Debug Protocols: 

• Cortex-M4 on JTAG and SWD
• Cortex-M0 only on JTAG

Possible solution

1. Open Hardware |  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.

More resources in winIDEA Help

• SoC
• Core-specific options