Hi Samruddhi, A few things: If you run the sci_ex2_loopback_interrupts example unchanged, can you verify that everything is working fine? If you run the code and it doesn't hit the ESTOP in the error() function, operation should be working correctly. The sci_ex2_loopback_interrupts example uses a 2-byte FIFO level to trigger the interrupt. Have you verified that at least 2 bytes of data are being received on GPIO 28? What changes have you made to the example code exactly? You will need to disable loopback mode to transmit/receive with the SCI module on the physical GPIO pins. To clarify, are you using the CPU timer to clear the SCI flags? If so, I wouldn't recommend this. You only want to clear these flags inside the ISR once all necessary ISR code has been run (except clearing the ACK bit) so that further interrupts can trigger. Best Regards, Delaney
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