Hello I am trying to use the TM4C123GH6PMI device on the LaunchPad to program and external TM4C1294NCPDT micro controller. I followed the next instructions:
""To use the EK-TM4C1294XL as a debug adapter to program and debug other Tiva C series devices several resistors must be removed. Remove the following resistors: R8, R10, R11, R15, R16.
Optionally remove R6 and R7. Removing these resistors allows the external use of the virtual serial port. To use the virtual serial port wire the off-board TX and RX signals to the test points labeled TXD and RXD. These test points are a part of X1 on the schematic and board. The transmit line of the MCU being debugged goes to TXD. The receive line of the MCU being debugged goes to RXD. NOTE: These are digital signals not RS232 signals the voltage range of these signals is 0V to 3.3V.
The sense circuit that is used to detect an external debug attachment must be disabled. There are at least two methods of doing this. The first and preferred method is to remove R40. The alternate method is to disconnect the U6 pin associated with R40 from the ground signal on the external target board. Ground or low voltage must not be seen by the TM4C123GH6PMI GPIO pin associated with R40.""
But I get the following:
""CORTEX_M4_0: GEL Output:
Memory Map Initialization Complete
CORTEX_M4_0: Error connecting to the target""
I added the necessary pull-up resistors to the TMS and TCK lines, can any of you help me understand how to program external TM4C micro controllers using the EK-TM4C1294XL debug out.
