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external/CMSIS_5/Device/ARM/ARMCM7/Source/system_ARMCM7.c

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+/**************************************************************************//**
+ * @file     system_ARMCM7.c
+ * @brief    CMSIS Device System Source File for
+ *           ARMCM7 Device
+ * @version  V1.0.1
+ * @date     15. November 2019
+ ******************************************************************************/
+/*
+ * Copyright (c) 2009-2019 Arm Limited. All rights reserved.
+ *
+ * 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.
+ */
+
+#if defined (ARMCM7)
+  #include "ARMCM7.h"
+#elif defined (ARMCM7_SP)
+  #include "ARMCM7_SP.h"
+#elif defined (ARMCM7_DP)
+  #include "ARMCM7_DP.h"
+#else
+  #error device not specified!
+#endif
+
+/*----------------------------------------------------------------------------
+  Define clocks
+ *----------------------------------------------------------------------------*/
+#define  XTAL            (50000000UL)     /* Oscillator frequency */
+
+#define  SYSTEM_CLOCK    (XTAL / 2U)
+
+/*----------------------------------------------------------------------------
+  Exception / Interrupt Vector table
+ *----------------------------------------------------------------------------*/
+extern const VECTOR_TABLE_Type __VECTOR_TABLE[240];
+
+
+/*----------------------------------------------------------------------------
+  System Core Clock Variable
+ *----------------------------------------------------------------------------*/
+uint32_t SystemCoreClock = SYSTEM_CLOCK;  /* System Core Clock Frequency */
+
+
+/*----------------------------------------------------------------------------
+  System Core Clock update function
+ *----------------------------------------------------------------------------*/
+void SystemCoreClockUpdate (void)
+{
+  SystemCoreClock = SYSTEM_CLOCK;
+}
+
+/*----------------------------------------------------------------------------
+  System initialization function
+ *----------------------------------------------------------------------------*/
+void SystemInit (void)
+{
+
+#if defined (__VTOR_PRESENT) && (__VTOR_PRESENT == 1U)
+  SCB->VTOR = (uint32_t) &(__VECTOR_TABLE[0]);
+#endif
+
+#if defined (__FPU_USED) && (__FPU_USED == 1U)
+  SCB->CPACR |= ((3U << 10U*2U) |           /* enable CP10 Full Access */
+                 (3U << 11U*2U)  );         /* enable CP11 Full Access */
+#endif
+
+#ifdef UNALIGNED_SUPPORT_DISABLE
+  SCB->CCR |= SCB_CCR_UNALIGN_TRP_Msk;
+#endif
+
+  SystemCoreClock = SYSTEM_CLOCK;
+}