ST STM3240G-SK/KEI handbook
Datasheet
The Keil starter kit for STM32F4 series microcontrollers (STM32F407IG MCU) is a complete, cost-effective solution for starting application development and evaluating the STMicroelectronics STM32F4 series ARM Cortex™-M4 processor-based microcontrollers. It provides all the hardware and software you need to start developing applications for the STM32 ARM core-based families of microcontrollers.