Content originally posted in LPCWare by R2D2 on Mon Apr 29 23:08:33 MST 2013
Quote: cwpjr
Or in the case of any custom HW - I have a factory new chip thats never been connected to. What is it's known state.:)
Empty. So there's no valid checksum entry and it's starting in ISP.
Quote: cwpjr
So All I can do is look at the signal;s and report what I see. Feels like I'm blinded asking for help.
First thing to do is to switch to ISP and enable Vector catch. Then check your hardware. That's not too difficult, because ISP doesn't need much.
With connected power, SWD and pullups for Reset and ISP, SWD is working.
If you leave ISP and start your code, there are a lot of other things which can disturb your SWD. But until now I don't know which MCU you are using and which hardware. Also I don't know what you've tried already. Feels like a blind asked for help.