I am bring up a custom board based on the DA14706 and cannot get JLINK connection working or uart serial bootingI can do a basic connection in jlink but it doesnt respond to any commands (mem, reset, halt, etc...)Is there something I need to do to a new chip to get it started?
Hi There,Thank you for posting your question online.
dovoto said:I am bring up a custom board based on the DA14706 and cannot get JLINK connection working or uart serial booting
Did you follow the DA1470x HW Guidelines AN-B-087 when designing the board?Please refer on the User Manual DA14706 PRO Development Kit UM-B-148, on sections 4.2 USB to UART and 4.3 USB to Serial Wire Debug Port (SWD).Please also refer on the DA1470x Datasheet. I believe you have used the correct SWD pins for the Cortex-M33Have you connected the Reset pin on your J-link probe? If yes, is it connected to the Flash as well?Best Regards,OV_Renesas
Yes, my board is designed directly from the 14706 daughter board. Which means reset from jlink is connected but not to flash....should it be? I dont see any notes about that.The only difference between mine is I do not have level translators on jlink or uart and am running them both at 3v.
Hi For all the Da series do not connect the reset, the reset on the DA series is unusual as it is active high not low, and the jlink keeps the reset high until resetting, We had this issue with the DA14683, took forever to find the issue. Once we disconnected the reset all worked fine. Hope this helps
Hi There,Thank you for the reply.You mentioned that you tried both J-link and UART serial programming/booting. The Reset is necessary for the UART serial programming, and I think all the J-Link probes have a Reset pin exposed. I was wondering if you have connected that as well. As Jeff mentioned, most of our DA BLE products have a Reset of active high, while the J-Link expects an active low. On our Dev Kits there is a level shifter so J-link can receive the correct Reset. It would be helpful if you shared the J-link probe you have and the connections you have made. I think most of the J-link probes have 5V exposed pin and not 3V. Best Regards,OV_Renesas
Active hi reset....who..what...omg...i hope thats it. Ill let you know when i get back to my office...if so, life saver.
Nearly all modern jlink have a vref for setting io voltage. I tried 3.0 and 1.8. I have a new probe ill try today and investigate the reset. Thanks for the active feedback. Ill let you know!