1 /*************************************************************************//**
2 * @file system_RP2040.c
3 * @brief CMSIS-Core(M) Device Peripheral Access Layer Header File for
4 * Device RP2040
5 * @version V1.0.0
6 * @date 5. May 2021
7 *****************************************************************************/
8 /*
9 * Copyright (c) 2009-2021 Arm Limited. All rights reserved.
10 * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
11 *
12 * SPDX-License-Identifier: Apache-2.0
13 *
14 * Licensed under the Apache License, Version 2.0 (the License); you may
15 * not use this file except in compliance with the License.
16 * You may obtain a copy of the License at
17 *
18 * www.apache.org/licenses/LICENSE-2.0
19 *
20 * Unless required by applicable law or agreed to in writing, software
21 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
22 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
23 * See the License for the specific language governing permissions and
24 * limitations under the License.
25 *
26 * SPDX-License-Identifier: BSD-3-Clause
27 */
28
29 #include <stdint.h>
30 #include "RP2040.h"
31 #include "hardware/clocks.h"
32
33 /*---------------------------------------------------------------------------
34 System Core Clock Variable
35 *---------------------------------------------------------------------------*/
36 uint32_t SystemCoreClock; /* System Clock Frequency (Core Clock)*/
37
38 /*---------------------------------------------------------------------------
39 System Core Clock function
40 *---------------------------------------------------------------------------*/
SystemCoreClockUpdate(void)41 void SystemCoreClockUpdate (void)
42 {
43 SystemCoreClock = clock_get_hz(clk_sys);
44 }
45
46 /*---------------------------------------------------------------------------
47 System initialization function
48 *---------------------------------------------------------------------------*/
SystemInit(void)49 void __attribute__((constructor)) SystemInit (void)
50 {
51 SystemCoreClockUpdate();
52 }
