Hi, Which compiler versio are you using? I added the following line LinaRegs.SCIFLR.bit.IDLE= 0x1; in the sci_ex1_echoback example located at \device_support\f28002x\examples\sci but did not face any issue during compilation, Please refer the following example and see if it resolves the issue. https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1255805/tms320f280039c-clash-of-symbol-idle-in-device_support-of-c2000-ware-5-0-0-0/4752768#4752768 Best Regards Siddharth
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