Using 1 LPC4322 to debug both LPC55S69 and QN9090 on a Custom PCB Board

[SrinathVelavan]

Hello, 

I am developing a custom PCB board with LPC55S69 as the host MCU. Inorder to debug my SDK, I am using LPC4322 as used by the EVK board of LPC55S69. Now, I am including QN9090 as part of my custom board. 

In the DK006 QN9090 development kit, LPC4322 is used as a debugger for linking to QN9090 chip. 

Can I use 1 LPC4322 to debug both my LPC55S69 and QN9090 using the SWD interface? If so, should I use the same SWD pins or can I configure the GPIO pins of LPC4322 to pinout 2 separate SWD pins (1 for LPC55S69 and 1 for QN9090)? Is this possible to do or should I use 2 separate LPC4322 debugger chips on my custom board??

Please help with this query.

TIA

[ErichStyger · Accepted solution]

Unlike JTAG, SWD is not designed to debug multiple devices in a daisy chain or other ways. I suggest you add two SWD ports with two debug probes attached.

[SrinathVelavan]

Thank you for the clarification.