STM32 Get the address of the register-EEWORLD

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If you need to use DMA transmission of TX1, it will involve configuring the peripheral address of DMA. Here, the peripheral address should be the address of DR register of USART1. But how to get the address of this register?

We have tested three methods and all of them are feasible.

method 1:

Directly query the register map in the manual, the DR address of USART1 is 0x40013804

Method 2:

According to the manual, the offset address of the DR register is 0X04, so the DR address of USART1 can be written as (USART1_BASE + 0X04).

Among them, USART1_BASE is defined in stm32f10xb.h

#define USART1_BASE (APB2PERIPH_BASE + 0x00003800U)

Method 3:

If we want to modify the value of DR to 0X03, we will write: USART1->DR = 0X03, then the address of DR is (uint32_t)(&USART1->DR)

The last method is the most pleasing and intuitive.

Keywords：STM32 Reference address：STM32 Get the address of the register

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