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Statup Source Code Error, Please help me

Question asked by DoHyun Kim on Apr 13, 2018

I am using the IAR compiler with the Cortex-M3 EVB board. I am trying to upload a simple USART Firmware on the EVB board using the Standard Peripheral Library. If you add a file to the startup code file (even though I did not add it), the system timing will be faster and the USART will not work properly. (MAKE works well without warning or error.) What's wrong?

I am using the STM32F103RBT6 chip.
Internal clock 8MHZ is used and no PLL is used.