290 lines
7.8 KiB
C
290 lines
7.8 KiB
C
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/**
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****************************************************************************************************
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* @file fm33lg0xx_fl_cmu.c
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* @author FMSH Application Team
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* @brief Src file of CMU FL Module
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****************************************************************************************************
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* @attention
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*
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* Copyright (c) [2021] [Fudan Microelectronics]
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* THIS SOFTWARE is licensed under Mulan PSL v2.
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* You can use this software according to the terms and conditions of the Mulan PSL v2.
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* You may obtain a copy of Mulan PSL v2 at:
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* http://license.coscl.org.cn/MulanPSL2
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PSL v2 for more details.
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*
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****************************************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "fm33lg0xx_fl.h"
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/** @addtogroup FM33LG0XX_FL_Driver
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* @{
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*/
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/** @addtogroup CMU
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* @{
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*/
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#ifdef FL_CMU_DRIVER_ENABLED
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/* Exported functions --------------------------------------------------------*/
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/** @addtogroup CMU_FL_EF_QUERY
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* @{
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*/
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/**
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* @brief 获取系统当前工作时钟SYSCLK。
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* @param None
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* @note 函数中用到了XTHF_VALUE 宏，这个宏应该被定义为外部晶振的输入频率值。
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*
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* @retval 系统时钟频率 (Hz)。
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*
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*/
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uint32_t FL_CMU_GetSystemClockFreq(void)
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{
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uint32_t frequency = 0;
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/* 获取系统时钟源 */
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switch(FL_CMU_GetSystemClockSource())
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{
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/* 系统时钟源为内部RCHF */
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case FL_CMU_SYSTEM_CLK_SOURCE_RCHF:
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/* 内部RCHF默认为8MHz ,可以配置为16或24M */
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frequency = FL_CMU_GetRCHFClockFreq();
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break;
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/* 系统时钟源为XTHF */
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case FL_CMU_SYSTEM_CLK_SOURCE_XTHF:
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frequency = XTHFClock;
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break;
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/* 系统时钟源为PLL */
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case FL_CMU_SYSTEM_CLK_SOURCE_PLL:
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frequency = FL_CMU_GetPLLClockFreq();
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break;
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/* 系统时钟源为内部RCLF */
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case FL_CMU_SYSTEM_CLK_SOURCE_RCLF:
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/* 根据RC4M的分频配置得出系统时钟 */
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frequency = FL_CMU_GetRCLFClockFreq();
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break;
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/* 系统时钟源为XTLF */
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case FL_CMU_SYSTEM_CLK_SOURCE_XTLF:
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/* 根据外部晶振的频率得出系统时钟 */
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frequency = XTLFClock;
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break;
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/* 系统时钟源为RCLP */
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case FL_CMU_SYSTEM_CLK_SOURCE_RCLP:
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frequency = 32768;
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break;
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default:
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frequency = FL_CMU_GetRCHFClockFreq();
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break;
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}
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return frequency;
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}
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/**
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* @brief 获取 AHB 总线时钟频率。
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*
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* @param SYSCLK_Frequency 系统主时钟频率SYSCLK
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*
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* @retval AHB 总线时钟频率(Hz)
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*
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*/
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uint32_t FL_CMU_GetAHBClockFreq(void)
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{
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uint32_t frequency = 0;
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/* 获取AHB分频系数，AHB源自系统主时钟 */
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switch(FL_CMU_GetAHBPrescaler())
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{
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case FL_CMU_AHBCLK_PSC_DIV1:
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frequency = FL_CMU_GetSystemClockFreq();
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break;
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case FL_CMU_AHBCLK_PSC_DIV2:
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frequency = FL_CMU_GetSystemClockFreq() / 2;
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break;
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case FL_CMU_AHBCLK_PSC_DIV4:
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frequency = FL_CMU_GetSystemClockFreq() / 4;
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break;
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case FL_CMU_AHBCLK_PSC_DIV8:
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frequency = FL_CMU_GetSystemClockFreq() / 8;
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break;
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case FL_CMU_AHBCLK_PSC_DIV16:
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frequency = FL_CMU_GetSystemClockFreq() / 16;
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break;
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default:
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frequency = FL_CMU_GetSystemClockFreq();
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break;
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}
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return frequency;
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}
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/**
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* @brief 获取当前系统的APB总线时钟
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* @param APB_Frequency APB总线的时钟频率
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*
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* @retval APB clock frequency (in Hz)
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*
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*/
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uint32_t FL_CMU_GetAPBClockFreq(void)
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{
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uint32_t frequency = 0;
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/* 获取APB1分频系数，APB源自AHB */
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switch(FL_CMU_GetAPBPrescaler())
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{
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case FL_CMU_APBCLK_PSC_DIV1:
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frequency = FL_CMU_GetAHBClockFreq();
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break;
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case FL_CMU_APBCLK_PSC_DIV2:
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frequency = FL_CMU_GetAHBClockFreq() / 2;
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break;
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case FL_CMU_APBCLK_PSC_DIV4:
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frequency = FL_CMU_GetAHBClockFreq() / 4;
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break;
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case FL_CMU_APBCLK_PSC_DIV8:
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frequency = FL_CMU_GetAHBClockFreq() / 8;
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break;
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case FL_CMU_APBCLK_PSC_DIV16:
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frequency = FL_CMU_GetAHBClockFreq() / 16;
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break;
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default:
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frequency = FL_CMU_GetAHBClockFreq();
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break;
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}
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return frequency;
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}
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/**
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* @brief 获取RCLF输出时钟频率
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* @param None
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*
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* @retval 返回RCLF输出时钟频率(Hz)
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*
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*/
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uint32_t FL_CMU_GetRCLFClockFreq(void)
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{
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uint32_t frequency = 0;
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switch(FL_CMU_RCLF_GetPrescaler())
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{
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case FL_CMU_RCLF_PSC_DIV1:
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frequency = 614400;
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break;
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case FL_CMU_RCLF_PSC_DIV4:
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frequency = 153600;
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break;
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case FL_CMU_RCLF_PSC_DIV8:
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frequency = 76800;
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break;
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case FL_CMU_RCLF_PSC_DIV16:
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frequency = 38400;
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break;
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default:
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frequency = 614400;
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break;
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}
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return frequency;
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}
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/**
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* @brief 获取RCHF输出时钟频率
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* @param None
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*
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* @retval 返回RCHF输出时钟频率(Hz)
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*
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*/
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uint32_t FL_CMU_GetRCHFClockFreq(void)
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{
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uint32_t frequency = 0;
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switch(FL_CMU_RCHF_GetFrequency())
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{
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case FL_CMU_RCHF_FREQUENCY_8MHZ:
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frequency = 8000000;
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break;
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case FL_CMU_RCHF_FREQUENCY_16MHZ:
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frequency = 16000000;
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break;
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case FL_CMU_RCHF_FREQUENCY_24MHZ:
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frequency = 24000000;
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break;
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case FL_CMU_RCHF_FREQUENCY_32MHZ:
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frequency = 32000000;
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break;
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default:
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frequency = 8000000;
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break;
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}
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return frequency;
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}
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/**
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* @brief 获取PLL输出时钟频率
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* @param None
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*
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* @retval 返回PLL输出时钟频率(Hz)
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*
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*/
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uint32_t FL_CMU_GetPLLClockFreq(void)
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{
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uint32_t frequency = 0;
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uint32_t multiplier = 0;
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/* 获取PLL时钟源 */
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switch(FL_CMU_PLL_GetClockSource())
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{
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case FL_CMU_PLL_CLK_SOURCE_RCHF:
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/* 获取RCHF配置主频 */
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frequency = FL_CMU_GetRCHFClockFreq();
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break;
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case FL_CMU_PLL_CLK_SOURCE_XTHF:
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frequency = XTHFClock;
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break;
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default:
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frequency = FL_CMU_GetRCHFClockFreq();
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break;
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}
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/* 获取PLL时钟分频系数 */
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switch(FL_CMU_PLL_GetPrescaler())
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{
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case FL_CMU_PLL_PSC_DIV1:
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break;
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case FL_CMU_PLL_PSC_DIV2:
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frequency /= 2;
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break;
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case FL_CMU_PLL_PSC_DIV4:
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frequency /= 4;
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break;
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case FL_CMU_PLL_PSC_DIV8:
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frequency /= 8;
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break;
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case FL_CMU_PLL_PSC_DIV12:
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frequency /= 12;
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break;
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case FL_CMU_PLL_PSC_DIV16:
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frequency /= 16;
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break;
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case FL_CMU_PLL_PSC_DIV24:
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frequency /= 24;
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break;
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case FL_CMU_PLL_PSC_DIV32:
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frequency /= 32;
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break;
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default:
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break;
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}
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multiplier = FL_CMU_PLL_ReadMultiplier() + 1;
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frequency *= multiplier;
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return frequency;
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}
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/**
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* @}
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*/
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#endif /* FL_CMU_DRIVER_ENABLED */
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/**
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* @}
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*/
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/**
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* @}
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*/
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/********************** (C) COPYRIGHT Fudan Microelectronics **** END OF FILE ***********************/
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