dtu_simple/app/HW/include/usart.h

#ifndef USART_H
#define USART_H

#include "gd32f30x.h"

typedef struct usart_data_buf_s
{
	uint8_t data[256];
	uint16_t data_cnt;
} usart_data_buf_t;

#define DE485_PIN                        GPIO_PIN_8
#define DE485_GPIO_PORT                  GPIOA
#define DE485_GPIO_CLK                   RCU_GPIOA


#define COM_485	                       USART0 
#define COM_485_CLK                    RCU_USART0
#define COM_485_TX_PIN                 GPIO_PIN_9
#define COM_485_RX_PIN                 GPIO_PIN_10
#define COM_485_GPIO_PORT              GPIOA
#define COM_485_GPIO_CLK               RCU_GPIOA
#define COM_485_IT_HANDLER             USART0_IRQn




void config_485_port(uint32_t com,uint32_t baudrate, uint8_t databits, uint8_t stopbits, uint8_t parity);
void gd_com_485_send(uint8_t *message,uint16_t size);
void gd_485_DE_pin_init(void);
void gd_485_DE_tx(void);
void gd_485_DE_rx(void);



#endif