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Problem with linking : undefined symbols

Flavien CASSAGNE

Hi all,

I make my first steps on STM32F4-discovery. I want to create my own base project with Keil µVision V5 13.0.0

I created a blank project with some includes but when i want to compile i have these errors :

linking...
.\Objects\First_project.axf: Error: L6218E: Undefined symbol EXTI_Init (referred from stm32f4_discovery.o).
.\Objects\First_project.axf: Error: L6218E: Undefined symbol GPIO_Init (referred from stm32f4_discovery.o).
.\Objects\First_project.axf: Error: L6218E: Undefined symbol GPIO_ReadInputDataBit (referred from stm32f4_discovery.o).
.\Objects\First_project.axf: Error: L6218E: Undefined symbol RCC_AHB1PeriphClockCmd (referred from stm32f4_discovery.o).
.\Objects\First_project.axf: Error: L6218E: Undefined symbol RCC_APB2PeriphClockCmd (referred from stm32f4_discovery.o).
.\Objects\First_project.axf: Error: L6218E: Undefined symbol SYSCFG_EXTILineConfig (referred from stm32f4_discovery.o).
.\Objects\First_project.axf: Error: L6218E: Undefined symbol RCC_APB2PeriphResetCmd (referred from stm32f4xx_adc.o).

I down know how to solve it. Someone can help me please ?

Thanks !