资 源 简 介
stm32F4 PID 和FPU程序，来源于STM32F4_DISCOVERY_JULIA，包括库文件，LCD显示
Main Changes
First official release for STM32F40x/41x devices
stm32f4xx_rtc.c: remove useless code from RTC_GetDate() function
stm32f4xx_rcc.c, stm32f4xx_spi.c, stm32f4xx_wwdg.c and stm32f4xx_syscfg.c: driver"s comments update
