添加协议解析

inc/board_config.h

@@ -31,7 +31,7 @@
 #define USART_PHY            USART0
 #define USART_PHY_BAUDRATE   115200U
 #define RS485_EN_PORT        GPIOA
-#define RS485_EN_PIN         GPIO_PIN_1
+#define RS485_EN_PIN         GPIO_PIN_4
 
 /******************************************************************************/
 

inc/gd32e23x_it.h

@@ -39,6 +39,9 @@ OF SUCH DAMAGE.
 #include "main.h"
 #include "systick.h"
 #include "board_config.h"
+#include "usart.h"
+#include "fwdgt.h"
+#include "rs485_protocol.h"
 
 /* function declarations */
 /* this function handles NMI exception */

inc/rs485_protocol.h

@@ -0,0 +1,51 @@
+//
+// Created by yelv1 on 24-12-31.
+//
+
+#ifndef RS485_PROTOCOL_H
+#define RS485_PROTOCOL_H
+
+#include "gd32e23x.h"
+#include "systick.h"
+#include "gd32e23x_libopt.h"
+#include "board_config.h"
+#include "usart.h"
+#include "fwdgt.h"
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+
+/******************************************************************************/
+
+#define RX_BUFFER_SIZE            32
+
+#define PROTOCOL_PACKAGE_HEADER   0xD5
+#define PROTOCOL_BOARD_TYPE       0x03
+#define PROTOCOL_PACKAGE_LENGTH   0x02
+
+/******************************************************************************/
+
+typedef enum
+{
+    VALIDATION_SUCCESS = 0,
+    VALIDATION_CRC_ERROR = 1,
+    VALIDATION_HEADER_ERROR = 2,
+    VALIDATION_TYPE_ERROR = 4,
+    VALIDATION_LENGTH_ERROR = 8
+} validation_result_t;
+
+/******************************************************************************/
+
+void process_command(uint8_t* cmd, size_t length);
+
+uint8_t calculate_crc(uint8_t data[], uint8_t data_length);
+
+validation_result_t validate_package_crc(uint8_t* data, uint8_t data_length);
+
+validation_result_t validate_package_header(uint8_t* data);
+
+validation_result_t validate_package_type(uint8_t* data);
+
+validation_result_t validate_data_length(uint8_t* data);
+
+#endif //RS485_PROTOCOL_H