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CCS/EK-TM4C123GXL: SysCtlDelay() is not working properly

Part Number: EK-TM4C123GXL

Tool/software: Code Composer Studio

Hi everyone,

I''m very new to the this Evaluation kit TM4C123GXL. i started with blink program for learning the peripherals. the LED was blinking properly with this delay function. but once i started inserting the UART printf() function in between these lines the delay got reduced and the LED started blinking fastly comparing before. but, in fact i didn't touch the Delay fuction for any modification. What is exactly happening at background?