I am using STM32F407VET6 with 25MHz crystal by STM32Cube_FW_F4_V1.16. I have changed HSE_VALUE to 25000000 in system_stm32f4xx.c and RCC_OscInitStruct.PLL.PLLM = 25 in SystemClock_Config main.c, but I found that usart3 baud rate is not correct. I set the baud rate to 9600, but I got 30075 from Oscilloscope. The method I used is in http://www.st.com/content/ccc/resource/technical/document/application_note/group0/66/fa/62/a2/5c/75/48/a8/DM00327191/fil… Page 9.
Here is my result.
Please help me. Thank you