1 /*
2 * Copyright 2018 NXP.
3 * All rights reserved.
4 *
5 * SPDX-License-Identifier: BSD-3-Clause
6 */
7
8 /*
9 * How to set up clock using clock driver functions:
10 *
11 * 1. Setup clock sources.
12 *
13 * 2. Setup voltage for the fastest of the clock outputs
14 *
15 * 3. Set up wait states of the flash.
16 *
17 * 4. Set up all dividers.
18 *
19 * 5. Set up all selectors to provide selected clocks.
20 */
21
22 /* TEXT BELOW IS USED AS SETTING FOR TOOLS *************************************
23 !!GlobalInfo
24 product: Clocks v5.0
25 processor: LPC51U68
26 mcu_data: ksdk2_0
27 processor_version: 0.0.4
28 * BE CAREFUL MODIFYING THIS COMMENT - IT IS YAML SETTINGS FOR TOOLS **********/
29
30 #include "fsl_power.h"
31 #include "fsl_clock.h"
32 #include "clock_config.h"
33
34 /*******************************************************************************
35 * Definitions
36 ******************************************************************************/
37
38 /*******************************************************************************
39 * Variables
40 ******************************************************************************/
41 /* System clock frequency. */
42 extern uint32_t SystemCoreClock;
43
44 /*******************************************************************************
45 ************************ BOARD_InitBootClocks function ************************
46 ******************************************************************************/
BOARD_InitBootClocks(void)47 void BOARD_InitBootClocks(void)
48 {
49 BOARD_BootClockRUN();
50 }
51
52 /*******************************************************************************
53 ********************** Configuration BOARD_BootClockRUN ***********************
54 ******************************************************************************/
55 /* TEXT BELOW IS USED AS SETTING FOR TOOLS *************************************
56 !!Configuration
57 name: BOARD_BootClockRUN
58 called_from_default_init: true
59 outputs:
60 - {id: SYSTICK_clock.outFreq, value: 12 MHz}
61 - {id: System_clock.outFreq, value: 12 MHz}
62 * BE CAREFUL MODIFYING THIS COMMENT - IT IS YAML SETTINGS FOR TOOLS **********/
63
64 /*******************************************************************************
65 * Variables for BOARD_BootClockRUN configuration
66 ******************************************************************************/
67 /*******************************************************************************
68 * Code for BOARD_BootClockRUN configuration
69 ******************************************************************************/
BOARD_BootClockRUN(void)70 void BOARD_BootClockRUN(void)
71 {
72 /*!< Set up the clock sources */
73 /*!< Set up FRO */
74 POWER_DisablePD(kPDRUNCFG_PD_FRO_EN); /*!< Ensure FRO is on */
75 CLOCK_SetupFROClocking(12000000U); /*!< Set up FRO to the 12 MHz, just for sure */
76 CLOCK_AttachClk(kFRO12M_to_MAIN_CLK); /*!< Switch to FRO 12MHz first to ensure we can change voltage without accidentally
77 being below the voltage for current speed */
78 POWER_SetVoltageForFreq(12000000U); /*!< Set voltage for the one of the fastest clock outputs: System clock output */
79 CLOCK_SetFLASHAccessCyclesForFreq(12000000U); /*!< Set FLASH wait states for core */
80
81 /*!< Set up dividers */
82 CLOCK_SetClkDiv(kCLOCK_DivAhbClk, 1U, false); /*!< Set AHBCLKDIV divider to value 1 */
83 CLOCK_SetClkDiv(kCLOCK_DivSystickClk, 0U, true); /*!< Reset SYSTICKCLKDIV divider counter and halt it */
84 CLOCK_SetClkDiv(kCLOCK_DivSystickClk, 1U, false); /*!< Set SYSTICKCLKDIV divider to value 1 */
85
86 /*!< Set up clock selectors - Attach clocks to the peripheries */
87 CLOCK_AttachClk(kFRO12M_to_MAIN_CLK); /*!< Switch MAIN_CLK to FRO12M */
88 /*!< Set SystemCoreClock variable. */
89 SystemCoreClock = BOARD_BOOTCLOCKRUN_CORE_CLOCK;
90 }
91
92
