Summary of doubts about STM32 serial communication-EEWORLD

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figure 1

As shown in the figure above, in line 1420, USART1_BASE is the base address of USART1. The function of (USART_TypeDef*) USART1_BASE is to convert USART1_BASE into a pointer of type USART_TypeDef*. The overall function of this statement is to convert USART1_BASE into a pointer of type USART_TypeDef*, and then name this pointer USART1. (Personal understanding: USART1 is a pointer to the USART_Typedef structure type, which is equivalent to USART1 being the address (first address) of a space. In this space, the members of this structure are arranged in sequence according to the order of the USART1 register address of STM32. The address (order) of each structure member corresponds to the corresponding register address on the STM32 hardware, and then the registers can be used at will through USART1.

As shown in Figure 2 and Figure 3, it is easy to see that the order of members in USART_TypeDef corresponds to the order of register addresses on the STM32 hardware.

figure 2

)

image 3

As shown in line 156 of Figure 4, the USART_DR register can be accessed through the pointer USART1.

Figure 4

Keywords：STM32 Reference address：Summary of doubts about STM32 serial communication

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