stm32f4

the official website to find information.For beginners, there are two documents that are essential: data sheets and reference manuals. The data sheet is used to see what resources are available on the chip you are using, the pin-corresponding function, and so on. The reference manual is used for development, viewing some of the relevant register configurations when debugging, how to use related functions, etc.Of course, the two above is about the whole chip all the information, development time

of stm32f40xx. If you do not add the macro definition in the pre-processing of Keil, the compilation of stm32f40xx will certainly fail. if the definition is complete, there will be no problem, because in. the H file contains 1 #ifdef STM32F40XX2 #define STM32F40_41xxx3 #endif /* STM32F40XX */In a word, it is to be compatible with the previous definition. The correct definition of 1.3.0 407 is to define the macro stm32f40_41xxx. You can add this macro in Keil preprocessing or in stm32f4xx. h.

It is also a half-baked thing with simple interrupt processing.Software environment: mdk470aHardware environment: STM32F4-Discovery. Press the key B1 to connect to the F4 Chip's pa0 pin. When a key is pressed, the pin level is pulled to the bottom.Function Description: an external interrupt is triggered when the B1 button is pressed. After entering the interrupt processing function, send messages through the serial port.Steps:1. Enable the PA clock an