1. GD32F4串口引脚查询
| TX | RX | CK | CTS | RTS | |
| USART0 | PA9,PA15,PB6 | PA10,PB3,PB7 | PA8 | PA11 | PA12 |
| USART1 | PA2,PD5 | PA3,PD6 | PA4,PD7 | PA0,PD3 | PA1,PD4 |
| USART2 | PB10,PC10,PD8 | PB11,PC5,PD9 | PB12,PC12,PD10 | PB13,PD11 | PB14,PD12 |
| UART3 | PA0,PC10 | PA1,PC11 | |||
| UART4 | PC12 | PD2 | |||
| USART5 | PA11,PC6,PG14 | PA12,PC7,PG9 | PC8,PG7 | PG13,PG15 | PG8,PG12 |
| UART6 | PF7,PE8 | PF6,PE7 | |||
| UART7 | PE1 | PE0 |
2. GD32F4复用功能查询
2.1 PA
2.2 PB
2.3 PC
2.4 PD
2.5 PE
2.6 PF
2.7 PG
2.8 PH
2.9 PI
