I have 5 TWR-K21D50M boards, 2 of the have following problems:
1.They wont program unless I use 'Mass erase on connect' and hold them in reset before starting programming.
2. While using sdk example (as GPIO one) it will program succesfully, but disconnect debugging in about 30 seconds.
3. When I am trieng to load a bigger binary I am getting error:
Loading programming algorithm ...
Processing Object File Data ...
Error communicating to target processor - try a RESET.
Error loading CRC-16 algorithm.
Error loading CRC-16 Algorithm.
Error verifying flash of device
Error occured during Flash programming.
PE-ERROR: Error downloading to the device.
The other 3 boards work fine, all of them have the same version of firmware. I am using KDS. Debugging through onboard usb using P&E.
Any sugestion what could be wrong with them before I send them back to suplier?