Hoping someone might be able to point me in the right direction here.
I've been battling for a few weeks trying to get UART access to my car's head unit (who doesn't get excited at hidden debug interfaces??).
After getting the LA out I realised I was getting a few erroneous spikes - not enough to generate frame errors or misinterpreted breaks but enough to throw off any of my adapters.
So I whipped out my opto isolated (adum3201) ft232rl and happily receives correctly (so assuming ground loop/noise with my non isolated adapter):
XTP_Cache( ) XTP_DramBank( ) XTP_DramAddr( ) XTP_DramBit( ) XTP_DramRef( ) XTP_RamBacc( ) XTP_RamWacc( ) XTP_RamBacc2( ) XTP_MMU( ) XTP_FLASH( ) XTP_FLASHRom3( ) XTP_WD1( ) XTP_WD2( ) XTP_INT( ) XTP_SCU( ) Hit any key:
Downside being that it seemingly doesn't want to respond to me when I hit any key.
Unfortunately I'm really not much of an EE (although slowly trying to learn!)
I can't quite get my head around the diagram and what the transistors are actually doing TX side - "PC_IT" > "PC_CPU".
Any help understanding where I could be going wrong would be greatly appreciated!