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UART

#define RXD 		GPIO_PA7
#define TXD		GPIO_PD4

LED

#define LED_BLUE        GPIO_PD4
#define LED_RED		GPIO_PD3
#define LED_GREEN	GPIO_PB1

EPD

https://www.waveshare.net/w/upload/5/57/2.13inch_e-Paper_HAT_Schematic.pdf

FPC-75288：SSD1680

#define EPD_ENABLE	GPIO_PA0
#define EPD_MOSI		GPIO_PB7
#define EPD_CLK		GPIO_PD7
#define EPD_CS		GPIO_PD2
#define EPD_DC 		GPIO_PB6
#define EPD_RESET 	GPIO_PB5
#define EPD_BUSY 	GPIO_PC6