CIU32_L051_M307R/Peripheral/CIU32L051_Lib/Source/ciu32l051_std_rcc.c

/************************************************************************************************/
/**
* @file               ciu32l051_std_rcc.c
* @author             MCU Ecosystem Development Team
* @brief              RCC STD<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
*                     ʵ<EFBFBD><EFBFBD>RCCʱ<EFBFBD><EFBFBD>Ƶ<EFBFBD>ʻ<EFBFBD>ȡ<EFBFBD><EFBFBD>API<EFBFBD><EFBFBD>
*
*
**************************************************************************************************
* @attention
* Copyright (c) CEC Huada Electronic Design Co.,Ltd. All rights reserved.
*
**************************************************************************************************
*/

/************************************************************************************************/
/**
* @addtogroup CIU32L051_STD_Driver
* @{
*/

/**
* @addtogroup RCC 
* @{
*
*/
/************************************************************************************************/


/*------------------------------------------includes--------------------------------------------*/
#include "ciu32l051_std.h"

/*-------------------------------------------functions------------------------------------------*/

/************************************************************************************************/
/**
* @addtogroup RCC_External_Functions 
* @{
*
*/
/************************************************************************************************/ 

/**
* @brief  <EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD>ǰϵͳʱ<EFBFBD><EFBFBD>Ƶ<EFBFBD>ʣ<EFBFBD>SYSCLK<EFBFBD><EFBFBD>
* @retval <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵͳʱ<EFBFBD><EFBFBD>Ƶ<EFBFBD>ʣ<EFBFBD>Hz<EFBFBD><EFBFBD>
*/
uint32_t std_rcc_get_sysclkfreq(void)
{
    uint32_t frequency = 0;
    uint32_t tmp = 0;
    
    /* <20><>ȡ<EFBFBD><C8A1>ǰϵͳʱ<CDB3><CAB1>Դ */
    switch(std_rcc_get_sysclk_source())
    {
        /* ϵͳʱ<CDB3><CAB1>ΪHXTAL<41><4C>HXTALĬ<4C><C4AC>8MHz */
        case RCC_SYSCLK_SRC_STATUS_HXTAL:
        {
            frequency = HXTAL_VALUE;
        }break;
        
        /* ϵͳʱ<CDB3><CAB1>ΪPLL */
        case RCC_SYSCLK_SRC_STATUS_PLLCLK:
        {
            frequency = std_rcc_get_pllfreq();
        }break;
        
        /* ϵͳʱ<CDB3><CAB1>ΪRCL */
        case RCC_SYSCLK_SRC_STATUS_RCL:
        {
            frequency = RCL_VALUE;
        }break;
        
        /* ϵͳʱ<CDB3><CAB1>ΪLXTAL */
        case RCC_SYSCLK_SRC_STATUS_LXTAL:
        {
            frequency = LXTAL_VALUE;
        }break;
        
        /* ϵͳʱ<CDB3><CAB1>ΪRCHSYS */
        case RCC_SYSCLK_SRC_STATUS_RCHSYS:
        default:
        {
            tmp = (1UL << ((RCC->CSR1 & (RCC_CSR1_RCHDIV_MASK))>> RCC_CSR1_RCHDIV_POS));
            frequency = RCH_VALUE/tmp;
        }break;
    }
    return frequency;
}

/**
* @brief  <EFBFBD><EFBFBD>ȡPLLʱ<EFBFBD><EFBFBD>Ƶ<EFBFBD>ʣ<EFBFBD>SYSCLK<EFBFBD><EFBFBD>
* @retval <EFBFBD><EFBFBD><EFBFBD><EFBFBD>PLLʱ<EFBFBD><EFBFBD>Ƶ<EFBFBD>ʣ<EFBFBD>Hz<EFBFBD><EFBFBD>
*/
uint32_t std_rcc_get_pllfreq(void)
{
    uint32_t frequency = 0;
    uint32_t tmp = 0;
    uint32_t pllm, plln, plldiv;
    
    /* <20><>ȡ<EFBFBD><C8A1>ǰϵͳʱ<CDB3><CAB1>Դ */
    if(std_rcc_get_pllsource() == RCC_PLLSRC_HXTAL)
    {      
        /* PLLʱ<4C><CAB1>ԴΪHXTAL */
         tmp = HXTAL_VALUE;
    }
    else
    {   
        /* PLLʱ<4C><CAB1>ԴΪRCH */
        tmp = RCH_VALUE;
    }
    
    pllm = (RCC->PLLCFG & RCC_PLLCFG_PLLM_MASK)>>RCC_PLLCFG_PLLM_POS;
    plln = (RCC->PLLCFG & RCC_PLLCFG_PLLN_MASK)>>RCC_PLLCFG_PLLN_POS;
            
    if(pllm == 0)
    {
        pllm = 32;
    }
            
    if(plln == 0)
    {
        plln = 8;
    }

    tmp = tmp*pllm/plln;            
    plldiv = (RCC->PLLCFG & RCC_PLLCFG_PLLDIV_MASK)>>RCC_PLLCFG_PLLDIV_POS;                        
    frequency = tmp/(1UL<<plldiv);
    
    return frequency;
}

/**
* @brief  <EFBFBD><EFBFBD>ȡAHBʱ<EFBFBD><EFBFBD>Ƶ<EFBFBD>ʣ<EFBFBD>HCLK<EFBFBD><EFBFBD>
* @retval <EFBFBD><EFBFBD><EFBFBD><EFBFBD>HCLKʱ<EFBFBD><EFBFBD>Ƶ<EFBFBD>ʣ<EFBFBD>Hz<EFBFBD><EFBFBD>
*/
uint32_t std_rcc_get_hclkfreq(void)
{
    uint32_t frequency = 0;
    uint32_t tmp, hclk_div;
    
    tmp = std_rcc_get_sysclkfreq();
    
    /* <20><>ȡAHB<48><42>Ƶ<EFBFBD><C6B5><EFBFBD><EFBFBD> */
    hclk_div = std_rcc_get_ahbdiv()>>RCC_CFG_HPRE_POS;
    frequency = tmp >> hclk_div;    

    return frequency;
}

/**
* @brief  <EFBFBD><EFBFBD>ȡAPB1ʱ<EFBFBD><EFBFBD>Ƶ<EFBFBD>ʣ<EFBFBD>PCLK1<EFBFBD><EFBFBD>
* @retval <EFBFBD><EFBFBD><EFBFBD><EFBFBD>PCLK1ʱ<EFBFBD><EFBFBD>Ƶ<EFBFBD>ʣ<EFBFBD>Hz<EFBFBD><EFBFBD>
*/
uint32_t std_rcc_get_pclk1freq(void)
{
    uint32_t frequency = 0;
    uint32_t tmp, pclk1_div;
    
    tmp = std_rcc_get_hclkfreq();
    
    /* <20><>ȡAPB1<42><31>Ƶ<EFBFBD><C6B5><EFBFBD><EFBFBD> */
    pclk1_div = std_rcc_get_apb1div()>>RCC_CFG_P1PRE_POS;
    
    if (pclk1_div < 3)
    {
        frequency = tmp;
    }
    else
    {
        pclk1_div -= 3;
        frequency = tmp >> pclk1_div;
    }
    
    return frequency;
}

/**
* @brief  <EFBFBD><EFBFBD>ȡAPB2ʱ<EFBFBD><EFBFBD>Ƶ<EFBFBD>ʣ<EFBFBD>PCLK2<EFBFBD><EFBFBD>
* @retval <EFBFBD><EFBFBD><EFBFBD><EFBFBD>PCLK2ʱ<EFBFBD><EFBFBD>Ƶ<EFBFBD>ʣ<EFBFBD>Hz<EFBFBD><EFBFBD>
*/
uint32_t std_rcc_get_pclk2freq(void)
{
    uint32_t frequency = 0;
    uint32_t tmp, pclk2_div;
    
    tmp = std_rcc_get_hclkfreq();
    
    /* <20><>ȡAPB2<42><32>Ƶ<EFBFBD><C6B5><EFBFBD><EFBFBD> */
    pclk2_div = std_rcc_get_apb2div()>>RCC_CFG_P2PRE_POS;

    if (pclk2_div < 3)
    {
        frequency = tmp;
    }
    else
    {
        pclk2_div -= 3;
        frequency = tmp >> pclk2_div;
    }    
    
    return frequency;
}


/** 
* @} 
*/



/** 
* @} 
*/

/** 
* @} 
*/