更改协议处理部分，但是串口没反应？

inc/rs485_protocol.h

@@ -13,13 +13,12 @@
 #include "fwdgt.h"
 #include <stddef.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include "ultrasonic_analog.h"
 
 /******************************************************************************/
 
-#define RX_BUFFER_SIZE            32
-
 #define PROTOCOL_PACKAGE_HEADER   0xD5
 #define PROTOCOL_BOARD_TYPE       0x04
 #define PROTOCOL_PACKAGE_LENGTH   0x02
@@ -43,10 +42,16 @@ typedef enum
     PS_PAYLOAD,
     PS_CRC,
     PS_NULL
-} packet_state;
+} packet_state_t;
 
 /******************************************************************************/
 
+#define BUF_SIZE              8
+#define MAX_CMD_SIZE          16
+#define PACKET_START_BYTE     0xD5
+
+
+bool code_seen(char code);
 // void process_command(uint8_t* cmd, size_t length);
 void process_command(void);
 

inc/usart.h

@@ -8,8 +8,29 @@
 #include "gd32e23x.h"
 #include "board_config.h"
 
+#define RX_BUFFER_SIZE            64
+
+typedef struct
+{
+    unsigned char buffer[RX_BUFFER_SIZE];
+    volatile unsigned int head;
+    volatile unsigned int tail;
+}ring_buffer;
+
 void usart_config(void);
 
 void rs485_config(void);
 
+void store_char(unsigned char data, ring_buffer *rx_buffer);
+
+uint16_t uart_available(void);
+
+int uart_read(void);
+
+void store_char(unsigned char data, ring_buffer *rx_buffer);
+
+uint16_t uart_available(void);
+
+int uart_read(void);
+
 #endif //USART_H