LPCXpresso LPC1769
Connecting J-Link to LPCXpresso LPC1769
For connecting J-Link with the LPC1769 the debug interface signal lines between the on-board debugger (LPC-Link) and the MCU must be separated, so that the LPC-Link cannot change pin states while the J-Link communicates with the target.
Some bridge wires in the middle of the board (J4) must be cut (for example by scratching):
1 <--> 2 ( 3V3 ==> don't change) 3 <--> 4 ( JTAG_TMS_SWDIO ==> cut ) 5 <--> 6 ( JTAG_TCLK_SWCLK ==> cut) 7 <--> 38 ( JTAG_TDO_SWO ==> cut ) 9 <--> 10 ( JTAG_TDI ==> cut ) 11 <--> 12 ( JTAG_RESET ==> cut ) 13 <--> 14 ( EXT_POW ==> don't change) 15 <--> 16 ( GDN ==> don't change)
After isolating the on-board debugger from the target MCU a new connector needs to be soldered to route debug interface signals to the J-Link.
J4 J-Link 2 <--> 1 (VTref) 4 <--> 7 (TMS) 6 <--> 9 (TCK) 8 <--> 13 (TDO) 10 <--> 5 (TDI) 12 <--> 15 (RESET) 16 <--> 4 (GND)
A successful connection should look like this: