We have been working on I.MX8MPLUS EVK while debugging getting an failed to connect to the target(Failed to connect to any devices on the target. Check that the target is correctly connected to the debug probe and powered on. Failed to connect to any devices on the target. Check that the target is correctly connected to the debug probe and powered on) error.
while debugging we observed on each and every pin of JTAG in oscilloscope then we found that TDO pin is 0.5v continuously when connected to DSTREAM debugger.
we are using ARM Development Studio 2025.0-1(Windows) and DSTREAM-ST debugger
==>We had previously worked on i.MX6 we are able to connect through JTAG with DSTREAM-ST and DS-5.
==>As same procedure we followed for I.MX8MPLUS also, but unable to connect and getting mentioned error.
IDLE STATE Debugging(connected JTAG through DSTREAM-ST)
---------------------------------------------------------------------------------------------------------
VTRF: 1.8V(high) 1.8V(high)
TMS: 0V(low) high low(changing)
TCK: 0V(low) depends on CLK values
TDI: 1.8V(high) data
TDO: 0.5V 0.5V
Reset: 1.8V(high) 1.8V(high)
my questions are:-
1.Why the error is coming, as we followed the procedure as mentioned in the arm website(https://developer.arm.com/documentation/102707/0100/Configure-a-debug-connection).
2. Does TDO will effect the JTAG detection.