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EK-TM4C123GXL: About the UART interface.

Part Number: EK-TM4C123GXL

Hi teams:

Attachment is my main function which modify from "~\ccsv5\TivaWare_C_Series-1.0\examples\boards\ek-tm4c123gxl-boostxl-senshub\compdcm_mpu9150" in the Tivaware software.
In this project, Both mpu9150 and UART work well if I only use four lines of code"LCD_Draw_Char(...);". But if I use more than 4 lines of this code, the UART serial port received only one data and stopped. I want to know what causes that?

Best regards

K.K