This problem is nothing to do with the problems detailed on the errata sheets, the lm3s8962 and lm3s6965 boards both have their default JTAG settings as JTAG output, i.e. you can debug another board from them. While this may seem an odd way round to make the defaults the fix to convert to JTAG input is quite simple, if a little awkward.
On the board you should find a gap marked “R27”, on the 8962 this is on the left side of the JTAG port when holding the board facing you with the JTAG port at the top, on the 6965 it’s between the JTAG port and the screen. You just need to replace this gap with a jumper or other connection, i.e. complete the connection. ALthough it’s marked “R27” it’s for a 0-ohm resistor so any wire or a solder bridge will do. If you use a jumper it will make converting between the two modes easier however will be harder to attach.
There is a small red LED, again (usually) to the left of the JTAG port, marked “DEBUG OUT”, if this is lit it means the board is in debug out mode, so you can debug another board with the current board. This may still occasionally come on, if it does just cycle the power until it doesn’t.
You should now be able to connect to, upload to and debug your boards.
RE: Can't connect JTAG to Luminary development board
This problem is nothing to do with the problems detailed on the errata sheets, the lm3s8962 and lm3s6965 boards both have their default JTAG settings as JTAG output, i.e. you can debug another board from them. While this may seem an odd way round to make the defaults the fix to convert to JTAG input is quite simple, if a little awkward.
On the board you should find a gap marked “R27”, on the 8962 this is on the left side of the JTAG port when holding the board facing you with the JTAG port at the top, on the 6965 it’s between the JTAG port and the screen. You just need to replace this gap with a jumper or other connection, i.e. complete the connection. ALthough it’s marked “R27” it’s for a 0-ohm resistor so any wire or a solder bridge will do. If you use a jumper it will make converting between the two modes easier however will be harder to attach.
There is a small red LED, again (usually) to the left of the JTAG port, marked “DEBUG OUT”, if this is lit it means the board is in debug out mode, so you can debug another board with the current board. This may still occasionally come on, if it does just cycle the power until it doesn’t.
You should now be able to connect to, upload to and debug your boards.
In summary: Bridge R27.
Thanks Alex. This is now
Thanks Alex. This is now working after connecting R27.
Best wishes, Dev.
Dev