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I have made a custom board using TM4C1230H6PM. I am using JTAG to load & debug the program into the board. The connections are made as shown in the picture below.
I am using the ICDI on TM4C123GXL launchpad load program into the board.
I tried using CCS v6, and it gives me error which says "Error connecting to target"
I tried using LMFlash programmer, and it gives me error "Error connecting to target - 0"
I have tried literally everything that this forum posts suggests, referred all documents relating to JTAG, but still no luck.
I have checked the pin to pin connections for all 4 JTAG signals - TCK, TMS, TDI and TDO. They are correct.
Somewhere in this forum, it was mentioned that the voltage on RESET pin after connection is made should be 3.3V, but here I am getting 2.7V. I tried using a different launchpad, and a different custom board, but still voltage is 2.7V.
How to diagnose this problem? What could have possibly gone wrong in this schematic?
Hi,
Please note some USB connection ports have 100 mA capability, while others have more, 500 mA. As there is an slew rate minimum imposed on startup conditions, a more capable port will behave better than a smaller one. Depends also on peripherals/circuits added by you, which also consume power at startup.
Amit Ashara said:I believe if you check that against your schematic you would have realized the mistake made.....
Yes Amit. I realized the mistake.
I assumed that VDDA is required for just ADC to operate. And as I was not using ADC module in the schematic, I kept it connected.
Once I connected VDDA to 3.3V, the problem was solved.
Thanks a lot.