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STM32F4 USART send differently before and after reset button is pressed

Question asked by Az_Zahra.Itsna on Aug 7, 2015
I use STM32F4 Discovery and a USB TTL to serially connect the ARM and the computer I use. I got a serial program and it is Parallax Terminal. The problem is when I download the program to the ARM, the character shown in Parallax is different from what I sent (according to ASCII table), but after I pressed the reset button in the ARM, the character received shown in the computer is correct, I wonder why?