TMS320F280049: Flash could not be programmed after a few times of programming

Hi Wayne,

Were you able to connect the device at least on other boards? 

For the above message to pop up their could be multiple issues:

Technically speaking, this happens if the JTAG debugger fails to access an ICEPick register (exceptions are MSP430, Stellaris and some C2000 Wireless connectivity and Digital Power MCUs, which do not have an ICEPICK). If the ICEPick driver reports this error immediately upon connect, it's likely a hard fail with the JTAG connection itself (loose cables or connections, etc.). However, if the error happens later in the debug session the reasons are different (perhaps the reliability of the JTAG connection due to noise, or improper firmware that causes the device to power cycle or reset, etc.).

Please refer to below material:

JTAG guide: http://www.ti.com/lit/an/spracf0/spracf0.pdf  

TI Resource Explorer (XDS): http://dev.ti.com/tirex/explore/node?node=AL8OWQmGKOMEKEatbOtBgg__FUz-xrs__LATEST

Debugging JTAG: https://software-dl.ti.com/ccs/esd/documents/ccs_debugging_jtag_connectivity_issues.html#host-connection-error

Best Regards,

Nirav