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Debug - ISR fault

Shoba Thurairaja
Prodigy 250 points
Other Parts Discussed in Thread: TCA8418, TM4C123GH6PGE

CCSV6, windows8.1, 64bit, XDS200USB probes

I am using a TM4C123GH6PGE micro controller, and LCD screen from Kentec (3.5inch) to display message and user enter a code using a I2C interface IC (TCA8418 chip to interface with 12 matrix keypad). The operation sequence is, when we press 99, the display will change messages, when ever we tried pressing the key faster, the display stop responding (screen suppose to change between two screen messages) and became none responsive whole hardware.

I debug the code using the XDS200 probes, while it is in running I tried to press the key faster and faster  as I can and  hit the ISR faults, and captured the following message. 

I do see the systick was Entry to exception and Exit from exception and encountering exception overflow handling. this is also captured below.

Thanks,

Shoba