Dear experts,
When making a QN9080 application system, I understand that the "external target debug interface" on the QN9080-DK board can be used for the debugging of the external device.
And there are quite many ports on the external target debug interface, mostly for SWD and JTAG communication. I will connect pin 2 and pin 4 of the interface to PA22 and PA23 of the external QN908x, and the ISPEN (pin 9) to pin 33 (CHIPMODE/PB02) of the external device.
And, should I leave the other pins (pin 1, 6, 8, 9, 10 of the external target debug interface) as floating pins?
What is the role of pin 1 (connected to somewhere invisible), and pin 6 (if_detect)?
Thank you for reading it.
Best regards, DY.
Hi @DeeY,
In order to program an off-board target, these jumper configurations are needed (Section 3.1.2 CMSIS-DAP to off-board target, QN908x DK User Guide
Pin 1 is connected to VCC depending on JP2 configuration:
Pin 9 (IF_DETECTED) is connected directly into LPC4322:
This schematic is located in QN9080DK's page, in the section of Design Resources (Design files for QN9080-DK).
As for design and connections, please help me looking into Design Considerations for Debug. I hope you find this helpful!
Best regards,
Julián
