I have developing something for a couple of months now, I have a few target boards, all of which programmed in circuit with no issues, no if I try any of them, i get an SWD Communication Failure!!
I have reset targets, reset the PC, re-installed the Keil software, tried a different 20 way ribbon cable, tried the internal jumper in the 3.3v position, lowered the download speed, but nothing works.
Any ideas on what else I can try?
Has anyone else had this problem?