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