Hai i am using LPC1857 in a custom designed card. I have followed the hardware design of MCB2300. My board was working well for months and suddenly it stopped working. Since it was working alright earlier, i didnt doubt the hardware design and hence made 4 more such boards. But now none of the boards are working/booting. In JTAG ( i am using both keil ULINK2 and Segger JLINK with KEIL microvision IDE) the core/cpu is not getting detected now. Also, i am not able to get any clock signals in the XTAL1 & 2 pins to which i have connected the 12MHz crystal. Even i tried giving an external oscillator signal to the GP_CLKIN but still not booting.
Can anyone help me out to solve this issue?
Hai,
The microcontroller core got detected when i selected SWD instead of JTAG in the KEIL IDE. But earlier when i was using the prototype board, i was working in JTAG mode. DOn't know why it is not working in JTAG mode now and only in SWD
Hai,
Thanks for the reply.
Can you please tell me how to perform the boundary scan test? Is it possible with the JTAG?
Thank you.
I googled for "jlink boundary scan", these are just the first 3 links which I think could show something useful:
How to do a simple JTAG (boundary) scan? - J-Link/Flasher related - SEGGER Forum