218 lines
4.6 KiB
C
218 lines
4.6 KiB
C
/************************************************************************************************/
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/**
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* @file ciu32l051_std_rcc.c
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* @author MCU Ecosystem Development Team
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* @brief RCC STD库驱动。
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* 实现RCC时钟频率获取等API。
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*
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*
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**************************************************************************************************
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* @attention
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* Copyright (c) CEC Huada Electronic Design Co.,Ltd. All rights reserved.
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*
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**************************************************************************************************
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*/
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/************************************************************************************************/
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/**
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* @addtogroup CIU32L051_STD_Driver
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* @{
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*/
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/**
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* @addtogroup RCC
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* @{
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*
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*/
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/************************************************************************************************/
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/*------------------------------------------includes--------------------------------------------*/
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#include "ciu32l051_std.h"
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/*-------------------------------------------functions------------------------------------------*/
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/************************************************************************************************/
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/**
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* @addtogroup RCC_External_Functions
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* @{
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*
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*/
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/************************************************************************************************/
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/**
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* @brief 获取当前系统时钟频率（SYSCLK）
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* @retval 返回系统时钟频率（Hz）
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*/
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uint32_t std_rcc_get_sysclkfreq(void)
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{
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uint32_t frequency = 0;
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uint32_t tmp = 0;
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/* 获取当前系统时钟源 */
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switch(std_rcc_get_sysclk_source())
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{
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/* 系统时钟为HXTAL，HXTAL默认8MHz */
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case RCC_SYSCLK_SRC_STATUS_HXTAL:
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{
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frequency = HXTAL_VALUE;
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}break;
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/* 系统时钟为PLL */
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case RCC_SYSCLK_SRC_STATUS_PLLCLK:
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{
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frequency = std_rcc_get_pllfreq();
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}break;
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/* 系统时钟为RCL */
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case RCC_SYSCLK_SRC_STATUS_RCL:
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{
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frequency = RCL_VALUE;
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}break;
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/* 系统时钟为LXTAL */
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case RCC_SYSCLK_SRC_STATUS_LXTAL:
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{
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frequency = LXTAL_VALUE;
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}break;
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/* 系统时钟为RCHSYS */
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case RCC_SYSCLK_SRC_STATUS_RCHSYS:
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default:
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{
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tmp = (1UL << ((RCC->CSR1 & (RCC_CSR1_RCHDIV_MASK))>> RCC_CSR1_RCHDIV_POS));
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frequency = RCH_VALUE/tmp;
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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时钟频率（SYSCLK）
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* @retval 返回PLL时钟频率（Hz）
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*/
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uint32_t std_rcc_get_pllfreq(void)
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{
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uint32_t frequency = 0;
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uint32_t tmp = 0;
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uint32_t pllm, plln, plldiv;
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/* 获取当前系统时钟源 */
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if(std_rcc_get_pllsource() == RCC_PLLSRC_HXTAL)
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{
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/* PLL时钟源为HXTAL */
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tmp = HXTAL_VALUE;
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}
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else
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{
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/* PLL时钟源为RCH */
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tmp = RCH_VALUE;
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}
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pllm = (RCC->PLLCFG & RCC_PLLCFG_PLLM_MASK)>>RCC_PLLCFG_PLLM_POS;
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plln = (RCC->PLLCFG & RCC_PLLCFG_PLLN_MASK)>>RCC_PLLCFG_PLLN_POS;
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if(pllm == 0)
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{
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pllm = 32;
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}
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if(plln == 0)
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{
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plln = 8;
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}
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tmp = tmp*pllm/plln;
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plldiv = (RCC->PLLCFG & RCC_PLLCFG_PLLDIV_MASK)>>RCC_PLLCFG_PLLDIV_POS;
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frequency = tmp/(1UL<<plldiv);
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return frequency;
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}
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/**
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* @brief 获取AHB时钟频率（HCLK）
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* @retval 返回HCLK时钟频率（Hz）
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*/
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uint32_t std_rcc_get_hclkfreq(void)
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{
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uint32_t frequency = 0;
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uint32_t tmp, hclk_div;
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tmp = std_rcc_get_sysclkfreq();
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/* 获取AHB分频因子 */
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hclk_div = std_rcc_get_ahbdiv()>>RCC_CFG_HPRE_POS;
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frequency = tmp >> hclk_div;
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return frequency;
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}
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/**
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* @brief 获取APB1时钟频率（PCLK1）
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* @retval 返回PCLK1时钟频率（Hz）
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*/
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uint32_t std_rcc_get_pclk1freq(void)
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{
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uint32_t frequency = 0;
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uint32_t tmp, pclk1_div;
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tmp = std_rcc_get_hclkfreq();
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/* 获取APB1分频因子 */
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pclk1_div = std_rcc_get_apb1div()>>RCC_CFG_P1PRE_POS;
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if (pclk1_div < 3)
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{
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frequency = tmp;
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}
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else
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{
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pclk1_div -= 3;
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frequency = tmp >> pclk1_div;
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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APB2时钟频率（PCLK2）
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* @retval 返回PCLK2时钟频率（Hz）
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*/
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uint32_t std_rcc_get_pclk2freq(void)
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{
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uint32_t frequency = 0;
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uint32_t tmp, pclk2_div;
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tmp = std_rcc_get_hclkfreq();
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/* 获取APB2分频因子 */
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pclk2_div = std_rcc_get_apb2div()>>RCC_CFG_P2PRE_POS;
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if (pclk2_div < 3)
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{
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frequency = tmp;
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}
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else
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{
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pclk2_div -= 3;
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frequency = tmp >> pclk2_div;
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}
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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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/**
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* @}
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*/
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/**
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* @}
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*/
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