Change HSE to 8MHz in conf/stm32f4xx_conf.h.
Change HSE to 8MHz in conf/stm32f4xx_conf.h.

The original one is 25MHz. However, Discovery board uses 8MHz.

zzz0072/STM32F429-Discovery-Disco-Pratice,zzz0072/STM32F429-Discovery-Disco-Pratice