Hi guys, A strange problem on a custom board built using a Philips LPC2136 ARM7TDMI chip, may be someone will have an idea... :
- Software developped and tested on a Keil MCP2130 eval board (with a LPC2138), programmed and debugged with a Ulink JTAG probe, no problem
- Recompiled for the target chip (LPC2136), tested on the eval board (as only the flash memory is more limited), no problem
- JTAG probe connected to the target board, flash program & verify cycle executes OK, however the firmware is apparently not working at all
- Debug mode with the JTAG on the target board (step by step starting from reset) : very strange, the instructions displayed are the one from our firmware, but their behaviour is not consistent with the instruction (ex a jump doesn't change PC, etc). Seems like the debugger memory and the target memory are not in synch...
- Tried with a slower speed on the JTAG, same behaviour
I'm 99% sure there is something wrong on the JTAG itself, but I've checked
10 times and it seems well wired. Moreover I don't understand how a program& verify cycle could be ok if the jtag was wrong... Or something linked to the LPC rom boot code ?
Any idea will be appreciated !
Friendly, Robert