定义
#define	LL_USART_TXRX_STANDARD 0x00000000U
#define	LL_USART_TXRX_SWAPPED (USART_CR2_SWAP)

定义文档

#define LL_USART_TXRX_STANDARD 0x00000000U

TX/RX pins are used as defined in standard pinout

Definition at line 410 of file stm32g4xx_ll_usart.h.

#define LL_USART_TXRX_SWAPPED (USART_CR2_SWAP)

TX and RX pins functions are swapped.

Definition at line 411 of file stm32g4xx_ll_usart.h.