CCS/TM4C1237H6PM: SSI Slave Mode No Replies After the First Transmission

Tool/software: Code Composer Studio

Hello,

I am trying to implement a SSI slave where I read 1 byte commands and return the result when the next command is received. 

The problem I am facing is after the first transmission I receive zeroes even If I put new data to the TX buffers.

Also when I poll GetDataNonBlocking It shows RX buffer to be empty even though on the logic analyzer I see the master sending the data.

To check the operation I put 2 bytes in the TX buffer and send 2 commands waiting sometime in between.

Here is my configuration: 

And I tried to read using 

SPIDataGet and the nonblocking version like this 

while(!SSIDataGetNonBlocking(SSI0_BASE, &ret_val)){}

After the first receive this is the status of the flags: 

As it is seen the transmit fifo still has data but because SSI is somehow stuck that data never gets sent.

If I reconfigure the SPI after the first transmission I see both of the values on transfers so I am not sure why the issue gets the module stuck. 

Does anyone have any clue on why the module might be getting stuck? 

Thanks for reading.