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+/*****************************************************************************/
+/**
+ * Description: System bus protocol head file.
+ *
+ * Date: 2023-05-06 10:12
+ * Last Edit Time: [2023-05-06 10:13]
+ *
+ * Revisions: Rev 0.0
+ * History:
+ * [2023-05-06]: Initial version.
+ *
+ * Copyright(c) 2021 Beijing Institute of Technology.
+ *
+ ******************************************************************************/
+
+#ifndef __SYSTEMBUS_H_
+#define __SYSTEMBUS_H_
+
+/***************************** Include Files *********************************/
+#include "systembus_uart.h" // SystemBus UART driver
+#include "circ_queue.h"
+#include <stdint.h>
+#include <stdbool.h>
+
+/************************** Constant Definitions *****************************/
+/************************** Data Type Definitions ****************************/
+// Definition of SystemBus instance.
+typedef struct
+{
+    uintptr_t baseAddr;
+    uint32_t txQueueMax;
+    uint32_t rxQueueMax;
+} SYSBUS_CONFIG;
+
+typedef struct
+{
+    SYSBUS_CONFIG config;
+    SYSBUS_UART *uartInst;
+    CIRC_QUEUE *txQueue;
+    CIRC_QUEUE *rxQueue;
+    bool isRxDone;
+    bool isTxDone;
+} SYSBUS;
+
+/************************** Function Prototypes ******************************/
+
+int32_t SystemBus_Init(SYSBUS **instPtr, SYSBUS_CONFIG *config);
+
+int32_t SystemBus_HandleCmd(SYSBUS *instPtr);
+
+int32_t SystemBus_FLJ_PeriodUpdate(SYSBUS *instPtr);
+int32_t SystemBus_LJ_PeriodUpdate(SYSBUS *instPtr);
+
+int32_t SystemBus_MakeResp(SYSBUS *instPtr);
+
+int32_t SystemBus_TxIntrHandler(SYSBUS *instPtr);
+int32_t SystemBus_RxIntrHandler(SYSBUS *instPtr);
+
+bool SystemBus_IsReqPendding(SYSBUS *instPtr);
+bool SystemBus_IsRsqPendding(SYSBUS *instPtr);
+
+bool SystemBus_IsTxBusy(SYSBUS *instPtr);
+bool SystemBus_IsRxBusy(SYSBUS *instPtr);
+
+#endif //__SYSTEMBUS_H_