1 /*
2  * Copyright (c) 2006-2021, RT-Thread Development Team
3  *
4  * SPDX-License-Identifier: Apache-2.0
5  *
6  * Change Logs:
7  * Date           Author       Notes
8  * 2024-04-10     shelton      first version
9  */
10 
11 #include "board.h"
12 
system_clock_config(void)13 void system_clock_config(void)
14 {
15   /* reset crm */
16   crm_reset();
17 
18   crm_clock_source_enable(CRM_CLOCK_SOURCE_HEXT, TRUE);
19 
20   /* wait till hext is ready */
21   while(crm_hext_stable_wait() == ERROR)
22   {
23   }
24 
25   /* config pll clock resource */
26   crm_pll_config(CRM_PLL_SOURCE_HEXT_DIV, CRM_PLL_MULT_48, CRM_PLL_OUTPUT_RANGE_GT72MHZ);
27 
28   /* config hext division */
29   crm_hext_clock_div_set(CRM_HEXT_DIV_2);
30 
31   /* enable pll */
32   crm_clock_source_enable(CRM_CLOCK_SOURCE_PLL, TRUE);
33 
34   /* wait till pll is ready */
35   while(crm_flag_get(CRM_PLL_STABLE_FLAG) != SET)
36   {
37   }
38 
39   /* config ahbclk */
40   crm_ahb_div_set(CRM_AHB_DIV_1);
41 
42   /* config apb2clk */
43   crm_apb2_div_set(CRM_APB2_DIV_2);
44 
45   /* config apb1clk */
46   crm_apb1_div_set(CRM_APB1_DIV_2);
47 
48   /* enable auto step mode */
49   crm_auto_step_mode_enable(TRUE);
50 
51   /* select pll as system clock source */
52   crm_sysclk_switch(CRM_SCLK_PLL);
53 
54   /* wait till pll is used as system clock source */
55   while(crm_sysclk_switch_status_get() != CRM_SCLK_PLL)
56   {
57   }
58 
59   /* disable auto step mode */
60   crm_auto_step_mode_enable(FALSE);
61 
62   /* update system_core_clock global variable */
63   system_core_clock_update();
64 }
65