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RTOS/TM4C129XNCZAD: single step exception

Part Number: TM4C129XNCZAD

Tool/software: TI-RTOS

Hi all,

i am working on a new platform with TM4C129X and an Blackhawk USB 560V2 debugger. CCS  is 6.1.3

I  wrote a small application  based on the UART Driver example for TI-RTOS.

Everything works fine, but I have a problem when I try debugging in single step. In single step I get the following exception. The error occurs not in every line. The stack is large enough.

I dont know, where to find the reason.

Any ideas?

Thank you in advance

Frank

Console:

FSR = 0x0008
HFSR = 0x40000000
DFSR = 0x00000001
MMAR = 0xe000ed34
BFAR = 0xe000ed38
AFSR = 0x00000000
Terminating execution...

ROV: