add gd32e51x

GD32E51x/GD/GD32E51x/Include/system_gd32e51x.h

@@ -0,0 +1,56 @@
+/*!
+    \file  system_gd32e51x.h
+    \brief CMSIS Cortex-M33 Device Peripheral Access Layer Header File for
+           GD32E51x Device Series
+*/
+
+/*
+ * Copyright (c) 2009-2018 Arm Limited. All rights reserved.
+ * Copyright (c) 2024, GigaDevice Semiconductor Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the License); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an AS IS BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* This file refers the CMSIS standard, some adjustments are made according to GigaDevice chips */
+
+#ifndef SYSTEM_GD32E51X_H
+#define SYSTEM_GD32E51X_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+
+/* firmware version can be aquired by uncommenting the macro */
+#define __FIRMWARE_VERSION_DEFINE
+
+/* system clock frequency (core clock) */
+extern uint32_t SystemCoreClock;
+
+/* function declarations */
+/* initialize the system and update the SystemCoreClock variable */
+extern void SystemInit (void);
+/* update the SystemCoreClock with current core clock retrieved from CPU registers */
+extern void SystemCoreClockUpdate (void);
+#ifdef __FIRMWARE_VERSION_DEFINE
+/* get firmware version */
+extern uint32_t gd32e51x_firmware_version_get(void);
+#endif /* __FIRMWARE_VERSION_DEFINE */
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SYSTEM_GD32E51X_H */