www.pudn.com > Micrium-ST-uCOS-II-LCD-STM32-SK.rar > stm32f10x_rcc.c
/******************** (C) COPYRIGHT 2007 STMicroelectronics ********************
* File Name : stm32f10x_rcc.c
* Author : MCD Application Team
* Date First Issued : 09/29/2006
* Description : This file provides all the RCC firmware functions.
********************************************************************************
* History:
* 05/21/2007: V0.3
* 04/02/2007: V0.2
* 02/05/2007: V0.1
* 09/29/2006: V0.01
********************************************************************************
* THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
* CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_rcc.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* ------------ RCC registers bit address in the alias region ----------- */
#define RCC_OFFSET (RCC_BASE - PERIPH_BASE)
/* --- CR Register ---*/
/* Alias word address of HSION bit */
#define CR_OFFSET (RCC_OFFSET + 0x00)
#define HSION_BitNumber 0x00
#define CR_HSION_BB (PERIPH_BB_BASE + (CR_OFFSET * 32) + (HSION_BitNumber * 4))
/* Alias word address of PLLON bit */
#define PLLON_BitNumber 0x18
#define CR_PLLON_BB (PERIPH_BB_BASE + (CR_OFFSET * 32) + (PLLON_BitNumber * 4))
/* Alias word address of CSSON bit */
#define CSSON_BitNumber 0x13
#define CR_CSSON_BB (PERIPH_BB_BASE + (CR_OFFSET * 32) + (CSSON_BitNumber * 4))
/* --- CFGR Register ---*/
/* Alias word address of USBPRE bit */
#define CFGR_OFFSET (RCC_OFFSET + 0x04)
#define USBPRE_BitNumber 0x16
#define CFGR_USBPRE_BB (PERIPH_BB_BASE + (CFGR_OFFSET * 32) + (USBPRE_BitNumber * 4))
/* --- BDCR Register ---*/
/* Alias word address of RTCEN bit */
#define BDCR_OFFSET (RCC_OFFSET + 0x20)
#define RTCEN_BitNumber 0x0F
#define BDCR_RTCEN_BB (PERIPH_BB_BASE + (BDCR_OFFSET * 32) + (RTCEN_BitNumber * 4))
/* Alias word address of BDRST bit */
#define BDRST_BitNumber 0x10
#define BDCR_BDRST_BB (PERIPH_BB_BASE + (BDCR_OFFSET * 32) + (BDRST_BitNumber * 4))
/* --- CSR Register ---*/
/* Alias word address of LSION bit */
#define CSR_OFFSET (RCC_OFFSET + 0x24)
#define LSION_BitNumber 0x00
#define CSR_LSION_BB (PERIPH_BB_BASE + (CSR_OFFSET * 32) + (LSION_BitNumber * 4))
/* ---------------------- RCC registers bit mask ------------------------ */
/* CR register bit mask */
#define CR_HSEBYP_Reset ((u32)0xFFFBFFFF)
#define CR_HSEBYP_Set ((u32)0x00040000)
#define CR_HSEON_Reset ((u32)0xFFFEFFFF)
#define CR_HSEON_Set ((u32)0x00010000)
#define CR_HSITRIM_Mask ((u32)0xFFFFFF07)
/* CFGR register bit mask */
#define CFGR_PLL_Mask ((u32)0xFFC0FFFF)
#define CFGR_PLLMull_Mask ((u32)0x003C0000)
#define CFGR_PLLSRC_Mask ((u32)0x00010000)
#define CFGR_PLLXTPRE_Mask ((u32)0x00020000)
#define CFGR_SWS_Mask ((u32)0x0000000C)
#define CFGR_SW_Mask ((u32)0xFFFFFFFC)
#define CFGR_HPRE_Reset_Mask ((u32)0xFFFFFF0F)
#define CFGR_HPRE_Set_Mask ((u32)0x000000F0)
#define CFGR_PPRE1_Reset_Mask ((u32)0xFFFFF8FF)
#define CFGR_PPRE1_Set_Mask ((u32)0x00000700)
#define CFGR_PPRE2_Reset_Mask ((u32)0xFFFFC7FF)
#define CFGR_PPRE2_Set_Mask ((u32)0x00003800)
#define CFGR_ADCPRE_Reset_Mask ((u32)0xFFFF3FFF)
#define CFGR_ADCPRE_Set_Mask ((u32)0x0000C000)
/* CSR register bit mask */
#define CSR_RMVF_Set ((u32)0x01000000)
/* RCC Flag Mask */
#define FLAG_Mask ((u8)0x1F)
/* Typical Value of the HSI in Hz */
#define HSI_Value ((u32)8000000)
/* BDCR register base address */
#define BDCR_BASE (PERIPH_BASE + BDCR_OFFSET)
/* Time out for HSE start up */
#define HSEStartUp_TimeOut 128
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
static uc8 APBAHBPrescTable[16] = {0, 0, 0, 0, 1, 2, 3, 4, 1, 2, 3, 4, 6, 7, 8, 9};
static uc8 ADCPrescTable[4] = {2, 4, 6, 8};
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name : RCC_DeInit
* Description : Deinitializes the RCC peripheral registers to their default
* reset values.
* - The HSITRIM[4:0] bits in RCC_CR register are not modified
* by this function.
* - The RCC_BDCR and RCC_CSR registers are not reset by this
* function.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void RCC_DeInit(void)
{
/* Disable APB2 Peripheral Reset */
RCC->APB2RSTR = 0x00000000;
/* Disable APB1 Peripheral Reset */
RCC->APB1RSTR = 0x00000000;
/* FLITF and SRAM Clock ON */
RCC->AHBENR = 0x00000014;
/* Disable APB2 Peripheral Clock */
RCC->APB2ENR = 0x00000000;
/* Disable APB1 Peripheral Clock */
RCC->APB1ENR = 0x00000000;
/* Set HSION bit */
RCC->CR |= (u32)0x00000001;
/* Reset SW[1:0], HPRE[3:0], PPRE1[2:0], PPRE2[2:0], ADCPRE[1:0] and MCO[2:0] bits*/
RCC->CFGR &= 0xF8FF0000;
/* Reset HSEON, CSSON and PLLON bits */
RCC->CR &= 0xFEF6FFFF;
/* Reset HSEBYP bit */
RCC->CR &= 0xFFFBFFFF;
/* Reset PLLSRC, PLLXTPRE, PLLMUL[3:0] and USBPRE bits */
RCC->CFGR &= 0xFF80FFFF;
/* Disable all interrupts */
RCC->CIR = 0x00000000;
}
/*******************************************************************************
* Function Name : RCC_HSEConfig
* Description : Configures the External High Speed oscillator (HSE).
* HSE can not be stopped if it is used directly or through the
* PLL as system clock.
* Input : - RCC_HSE: specifies the new state of the HSE.
* This parameter can be one of the following values:
* - RCC_HSE_OFF: HSE oscillator OFF
* - RCC_HSE_ON: HSE oscillator ON
* - RCC_HSE_Bypass: HSE oscillator bypassed with external
* clock
* Output : None
* Return : None
*******************************************************************************/
void RCC_HSEConfig(u32 RCC_HSE)
{
/* Check the parameters */
assert(IS_RCC_HSE(RCC_HSE));
/* Reset HSEON and HSEBYP bits before configuring the HSE ------------------*/
/* Reset HSEON bit */
RCC->CR &= CR_HSEON_Reset;
/* Reset HSEBYP bit */
RCC->CR &= CR_HSEBYP_Reset;
/* Configure HSE (RCC_HSE_OFF is already covered by the code section above) */
switch(RCC_HSE)
{
case RCC_HSE_ON:
/* Set HSEON bit */
RCC->CR |= CR_HSEON_Set;
break;
case RCC_HSE_Bypass:
/* Set HSEBYP and HSEON bits */
RCC->CR |= CR_HSEBYP_Set | CR_HSEON_Set;
break;
default:
break;
}
}
/*******************************************************************************
* Function Name : RCC_WaitForHSEStartUp
* Description : Waits for HSE start-up.
* Input : None
* Output : None
* Return : An ErrorStatus enumuration value:
* - SUCCESS: HSE oscillator is stable and ready to use
* - ERROR: HSE oscillator not yet ready
*******************************************************************************/
ErrorStatus RCC_WaitForHSEStartUp(void)
{
vu32 StartUpCounter = 0;
/* Wait till HSE is ready and if Time out is reached exit */
while((RCC_GetFlagStatus(RCC_FLAG_HSERDY) == RESET) &&
(StartUpCounter != HSEStartUp_TimeOut))
{
StartUpCounter++;
}
if(RCC_GetFlagStatus(RCC_FLAG_HSERDY) != RESET)
{
return SUCCESS;
}
else
{
return ERROR;
}
}
/*******************************************************************************
* Function Name : RCC_AdjustHSICalibrationValue
* Description : Adjusts the Internal High Speed oscillator (HSI) calibration
* value.
* Input : - HSICalibrationValue: specifies the calibration trimming value.
* This parameter must be a number between 0 and 0x1F.
* Output : None
* Return : None
*******************************************************************************/
void RCC_AdjustHSICalibrationValue(u8 HSICalibrationValue)
{
u32 tmpreg = 0;
/* Check the parameters */
assert(IS_RCC_CALIBRATION_VALUE(HSICalibrationValue));
tmpreg = RCC->CR;
/* Clear HSITRIM[7:3] bits */
tmpreg &= CR_HSITRIM_Mask;
/* Set the HSITRIM[7:3] bits according to HSICalibrationValue value */
tmpreg |= (u32)HSICalibrationValue << 3;
/* Store the new value */
RCC->CR = tmpreg;
}
/*******************************************************************************
* Function Name : RCC_HSICmd
* Description : Enables or disables the Internal High Speed oscillator (HSI).
* HSI can not be stopped if it is used directly or through the
* PLL as system clock.
* Input : - NewState: new state of the HSI.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void RCC_HSICmd(FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
*(vu32 *) CR_HSION_BB = (u32)NewState;
}
/*******************************************************************************
* Function Name : RCC_PLLConfig
* Description : Configures the PLL clock source and multiplication factor.
* This function must be used only when the PLL is disabled.
* Input : - RCC_PLLSource: specifies the PLL entry clock source.
* This parameter can be one of the following values:
* - RCC_PLLSource_HSI_Div2: HSI oscillator clock divided
* by 2 selected as PLL clock entry
* - RCC_PLLSource_HSE_Div1: HSE oscillator clock selected
* as PLL clock entry
* - RCC_PLLSource_HSE_Div2: HSE oscillator clock divided
* by 2 selected as PLL clock entry
* - RCC_PLLMul: specifies the PLL multiplication factor.
* This parameter can be RCC_PLLMul_x where x:[2,16]
* Output : None
* Return : None
*******************************************************************************/
void RCC_PLLConfig(u32 RCC_PLLSource, u32 RCC_PLLMul)
{
u32 tmpreg = 0;
/* Check the parameters */
assert(IS_RCC_PLL_SOURCE(RCC_PLLSource));
assert(IS_RCC_PLL_MUL(RCC_PLLMul));
tmpreg = RCC->CFGR;
/* Clear PLLSRC, PLLXTPRE and PLLMUL[21:18] bits */
tmpreg &= CFGR_PLL_Mask;
/* Set the PLL configuration bits */
tmpreg |= RCC_PLLSource | RCC_PLLMul;
/* Store the new value */
RCC->CFGR = tmpreg;
}
/*******************************************************************************
* Function Name : RCC_PLLCmd
* Description : Enables or disables the PLL.
* The PLL can not be disabled if it is used as system clock.
* Input : - NewState: new state of the PLL.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void RCC_PLLCmd(FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
*(vu32 *) CR_PLLON_BB = (u32)NewState;
}
/*******************************************************************************
* Function Name : RCC_SYSCLKConfig
* Description : Configures the system clock (SYSCLK).
* Input : - RCC_SYSCLKSource: specifies the clock source used as system
* clock. This parameter can be one of the following values:
* - RCC_SYSCLKSource_HSI: HSI selected as system clock
* - RCC_SYSCLKSource_HSE: HSE selected as system clock
* - RCC_SYSCLKSource_PLLCLK: PLL selected as system clock
* Output : None
* Return : None
*******************************************************************************/
void RCC_SYSCLKConfig(u32 RCC_SYSCLKSource)
{
u32 tmpreg = 0;
/* Check the parameters */
assert(IS_RCC_SYSCLK_SOURCE(RCC_SYSCLKSource));
tmpreg = RCC->CFGR;
/* Clear SW[1:0] bits */
tmpreg &= CFGR_SW_Mask;
/* Set SW[1:0] bits according to RCC_SYSCLKSource value */
tmpreg |= RCC_SYSCLKSource;
/* Store the new value */
RCC->CFGR = tmpreg;
}
/*******************************************************************************
* Function Name : RCC_GetSYSCLKSource
* Description : Returns the clock source used as system clock.
* Input : None
* Output : None
* Return : The clock source used as system clock. The returned value can
* be one of the following:
* - 0x00: HSI used as system clock
* - 0x04: HSE used as system clock
* - 0x08: PLL used as system clock
*******************************************************************************/
u8 RCC_GetSYSCLKSource(void)
{
return ((u8)(RCC->CFGR & CFGR_SWS_Mask));
}
/*******************************************************************************
* Function Name : RCC_HCLKConfig
* Description : Configures the AHB clock (HCLK).
* Input : - RCC_HCLK: defines the AHB clock. This clock is derived
* from the system clock (SYSCLK).
* This parameter can be one of the following values:
* - RCC_SYSCLK_Div1: AHB clock = SYSCLK
* - RCC_SYSCLK_Div2: AHB clock = SYSCLK/2
* - RCC_SYSCLK_Div4: AHB clock = SYSCLK/4
* - RCC_SYSCLK_Div8: AHB clock = SYSCLK/8
* - RCC_SYSCLK_Div16: AHB clock = SYSCLK/16
* - RCC_SYSCLK_Div64: AHB clock = SYSCLK/64
* - RCC_SYSCLK_Div128: AHB clock = SYSCLK/128
* - RCC_SYSCLK_Div256: AHB clock = SYSCLK/256
* - RCC_SYSCLK_Div512: AHB clock = SYSCLK/512
* Output : None
* Return : None
*******************************************************************************/
void RCC_HCLKConfig(u32 RCC_HCLK)
{
u32 tmpreg = 0;
/* Check the parameters */
assert(IS_RCC_HCLK(RCC_HCLK));
tmpreg = RCC->CFGR;
/* Clear HPRE[7:4] bits */
tmpreg &= CFGR_HPRE_Reset_Mask;
/* Set HPRE[7:4] bits according to RCC_HCLK value */
tmpreg |= RCC_HCLK;
/* Store the new value */
RCC->CFGR = tmpreg;
}
/*******************************************************************************
* Function Name : RCC_PCLK1Config
* Description : Configures the Low Speed APB clock (PCLK1).
* Input : - RCC_PCLK1: defines the APB1 clock. This clock is derived
* from the AHB clock (HCLK).
* This parameter can be one of the following values:
* - RCC_HCLK_Div1: APB1 clock = HCLK
* - RCC_HCLK_Div2: APB1 clock = HCLK/2
* - RCC_HCLK_Div4: APB1 clock = HCLK/4
* - RCC_HCLK_Div8: APB1 clock = HCLK/8
* - RCC_HCLK_Div16: APB1 clock = HCLK/16
* Output : None
* Return : None
*******************************************************************************/
void RCC_PCLK1Config(u32 RCC_PCLK1)
{
u32 tmpreg = 0;
/* Check the parameters */
assert(IS_RCC_PCLK(RCC_PCLK1));
tmpreg = RCC->CFGR;
/* Clear PPRE1[10:8] bits */
tmpreg &= CFGR_PPRE1_Reset_Mask;
/* Set PPRE1[10:8] bits according to RCC_PCLK1 value */
tmpreg |= RCC_PCLK1;
/* Store the new value */
RCC->CFGR = tmpreg;
}
/*******************************************************************************
* Function Name : RCC_PCLK2Config
* Description : Configures the High Speed APB clock (PCLK2).
* Input : - RCC_PCLK2: defines the APB2 clock. This clock is derived
* from the AHB clock (HCLK).
* This parameter can be one of the following values:
* - RCC_HCLK_Div1: APB2 clock = HCLK
* - RCC_HCLK_Div2: APB2 clock = HCLK/2
* - RCC_HCLK_Div4: APB2 clock = HCLK/4
* - RCC_HCLK_Div8: APB2 clock = HCLK/8
* - RCC_HCLK_Div16: APB2 clock = HCLK/16
* Output : None
* Return : None
*******************************************************************************/
void RCC_PCLK2Config(u32 RCC_PCLK2)
{
u32 tmpreg = 0;
/* Check the parameters */
assert(IS_RCC_PCLK(RCC_PCLK2));
tmpreg = RCC->CFGR;
/* Clear PPRE2[13:11] bits */
tmpreg &= CFGR_PPRE2_Reset_Mask;
/* Set PPRE2[13:11] bits according to RCC_PCLK2 value */
tmpreg |= RCC_PCLK2 << 3;
/* Store the new value */
RCC->CFGR = tmpreg;
}
/*******************************************************************************
* Function Name : RCC_ITConfig
* Description : Enables or disables the specified RCC interrupts.
* Input : - RCC_IT: specifies the RCC interrupt sources to be enabled
* or disabled.
* This parameter can be any combination of the following values:
* - RCC_IT_LSIRDY: LSI ready interrupt
* - RCC_IT_LSERDY: LSE ready interrupt
* - RCC_IT_HSIRDY: HSI ready interrupt
* - RCC_IT_HSERDY: HSE ready interrupt
* - RCC_IT_PLLRDY: PLL ready interrupt
* - NewState: new state of the specified RCC interrupts.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void RCC_ITConfig(u8 RCC_IT, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_RCC_IT(RCC_IT));
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Perform Byte access to RCC_CIR[12:8] bits to enable the selected interrupts */
*(vu8 *) 0x40021009 |= RCC_IT;
}
else
{
/* Perform Byte access to RCC_CIR[12:8] bits to disable the selected interrupts */
*(vu8 *) 0x40021009 &= ~(u32)RCC_IT;
}
}
/*******************************************************************************
* Function Name : RCC_USBCLKConfig
* Description : Configures the USB clock (USBCLK).
* Input : - RCC_USBCLKSource: specifies the USB clock source. This clock
* is derived from the PLL output.
* This parameter can be one of the following values:
* - RCC_USBCLKSource_PLLCLK_1Div5: PLL clock divided by 1,5
* selected as USB clock source
* - RCC_USBCLKSource_PLLCLK_Div1: PLL clock selected as USB
* clock source
* Output : None
* Return : None
*******************************************************************************/
void RCC_USBCLKConfig(u32 RCC_USBCLKSource)
{
/* Check the parameters */
assert(IS_RCC_USBCLK_SOURCE(RCC_USBCLKSource));
*(vu32 *) CFGR_USBPRE_BB = RCC_USBCLKSource;
}
/*******************************************************************************
* Function Name : RCC_ADCCLKConfig
* Description : Configures the ADC clock (ADCCLK).
* Input : - RCC_ADCCLK: defines the ADC clock. This clock is derived
* from the APB2 clock (PCLK2).
* This parameter can be one of the following values:
* - RCC_PCLK2_Div2: ADC clock = PCLK2/2
* - RCC_PCLK2_Div4: ADC clock = PCLK2/4
* - RCC_PCLK2_Div6: ADC clock = PCLK2/6
* - RCC_PCLK2_Div8: ADC clock = PCLK2/8
* Output : None
* Return : None
*******************************************************************************/
void RCC_ADCCLKConfig(u32 RCC_ADCCLK)
{
u32 tmpreg = 0;
/* Check the parameters */
assert(IS_RCC_ADCCLK(RCC_ADCCLK));
tmpreg = RCC->CFGR;
/* Clear ADCPRE[15:14] bits */
tmpreg &= CFGR_ADCPRE_Reset_Mask;
/* Set ADCPRE[15:14] bits according to RCC_ADCCLK value */
tmpreg |= RCC_ADCCLK;
/* Store the new value */
RCC->CFGR = tmpreg;
}
/*******************************************************************************
* Function Name : RCC_LSEConfig
* Description : Configures the External Low Speed oscillator (LSE).
* Input : - RCC_LSE: specifies the new state of the LSE.
* This parameter can be one of the following values:
* - RCC_LSE_OFF: LSE oscillator OFF
* - RCC_LSE_ON: LSE oscillator ON
* - RCC_LSE_Bypass: LSE oscillator bypassed with external
* clock
* Output : None
* Return : None
*******************************************************************************/
void RCC_LSEConfig(u32 RCC_LSE)
{
/* Check the parameters */
assert(IS_RCC_LSE(RCC_LSE));
/* Reset LSEON and LSEBYP bits before configuring the LSE ------------------*/
/* Reset LSEON bit */
*(vu8 *) BDCR_BASE = RCC_LSE_OFF;
/* Reset LSEBYP bit */
*(vu8 *) BDCR_BASE = RCC_LSE_OFF;
/* Configure LSE (RCC_LSE_OFF is already covered by the code section above) */
switch(RCC_LSE)
{
case RCC_LSE_ON:
/* Set LSEON bit */
*(vu8 *) BDCR_BASE = RCC_LSE_ON;
break;
case RCC_LSE_Bypass:
/* Set LSEBYP and LSEON bits */
*(vu8 *) BDCR_BASE = RCC_LSE_Bypass | RCC_LSE_ON;
break;
default:
break;
}
}
/*******************************************************************************
* Function Name : RCC_LSICmd
* Description : Enables or disables the Internal Low Speed oscillator (LSI).
* LSI can not be disabled if the IWDG is running.
* Input : - NewState: new state of the LSI.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void RCC_LSICmd(FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
*(vu32 *) CSR_LSION_BB = (u32)NewState;
}
/*******************************************************************************
* Function Name : RCC_RTCCLKConfig
* Description : Configures the RTC clock (RTCCLK).
* Once the RTC clock is selected it can’t be changed unless the
* Backup domain is reset.
* Input : - RCC_RTCCLKSource: specifies the RTC clock source.
* This parameter can be one of the following values:
* - RCC_RTCCLKSource_LSE: LSE selected as RTC clock
* - RCC_RTCCLKSource_LSI: LSI selected as RTC clock
* - RCC_RTCCLKSource_HSE_Div128: HSE clock divided by 128
* selected as RTC clock
* Output : None
* Return : None
*******************************************************************************/
void RCC_RTCCLKConfig(u32 RCC_RTCCLKSource)
{
/* Check the parameters */
assert(IS_RCC_RTCCLK_SOURCE(RCC_RTCCLKSource));
/* Select the RTC clock source */
RCC->BDCR |= RCC_RTCCLKSource;
}
/*******************************************************************************
* Function Name : RCC_RTCCLKCmd
* Description : Enables or disables the RTC clock.
* This function must be used only after the RTC clock was
* selected using the RCC_RTCCLKConfig function.
* Input : - NewState: new state of the RTC clock.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void RCC_RTCCLKCmd(FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
*(vu32 *) BDCR_RTCEN_BB = (u32)NewState;
}
/*******************************************************************************
* Function Name : RCC_GetClocksFreq
* Description : Returns the frequencies of different on chip clocks.
* Input : - RCC_Clocks: pointer to a RCC_ClocksTypeDef structure which
* will hold the clocks frequencies.
* Output : None
* Return : None
*******************************************************************************/
void RCC_GetClocksFreq(RCC_ClocksTypeDef* RCC_Clocks)
{
u32 tmp = 0, pllmull = 0, pllsource = 0, presc = 0;
/* Get SYSCLK source -------------------------------------------------------*/
tmp = RCC->CFGR & CFGR_SWS_Mask;
switch (tmp)
{
case 0x00: /* HSI used as system clock */
RCC_Clocks->SYSCLK_Frequency = HSI_Value;
break;
case 0x04: /* HSE used as system clock */
RCC_Clocks->SYSCLK_Frequency = HSE_Value;
break;
case 0x08: /* PLL used as system clock */
/* Get PLL clock source and multiplication factor ----------------------*/
pllmull = RCC->CFGR & CFGR_PLLMull_Mask;
pllmull = ( pllmull >> 18) + 2;
pllsource = RCC->CFGR & CFGR_PLLSRC_Mask;
if (pllsource == 0x00)
{/* HSI oscillator clock divided by 2 selected as PLL clock entry */
RCC_Clocks->SYSCLK_Frequency = (HSI_Value >> 1) * pllmull;
}
else
{/* HSE selected as PLL clock entry */
if ((RCC->CFGR & CFGR_PLLXTPRE_Mask) != (u32)RESET)
{/* HSE oscillator clock divided by 2 */
RCC_Clocks->SYSCLK_Frequency = (HSE_Value >> 1) * pllmull;
}
else
{
RCC_Clocks->SYSCLK_Frequency = HSE_Value * pllmull;
}
}
break;
default:
RCC_Clocks->SYSCLK_Frequency = HSI_Value;
break;
}
/* Compute HCLK, PCLK1, PCLK2 and ADCCLK clocks frequencies ----------------*/
/* Get HCLK prescaler */
tmp = RCC->CFGR & CFGR_HPRE_Set_Mask;
tmp = tmp >> 4;
presc = APBAHBPrescTable[tmp];
/* HCLK clock frequency */
RCC_Clocks->HCLK_Frequency = RCC_Clocks->SYSCLK_Frequency >> presc;
/* Get PCLK1 prescaler */
tmp = RCC->CFGR & CFGR_PPRE1_Set_Mask;
tmp = tmp >> 8;
presc = APBAHBPrescTable[tmp];
/* PCLK1 clock frequency */
RCC_Clocks->PCLK1_Frequency = RCC_Clocks->HCLK_Frequency >> presc;
/* Get PCLK2 prescaler */
tmp = RCC->CFGR & CFGR_PPRE2_Set_Mask;
tmp = tmp >> 11;
presc = APBAHBPrescTable[tmp];
/* PCLK2 clock frequency */
RCC_Clocks->PCLK2_Frequency = RCC_Clocks->HCLK_Frequency >> presc;
/* Get ADCCLK prescaler */
tmp = RCC->CFGR & CFGR_ADCPRE_Set_Mask;
tmp = tmp >> 14;
presc = ADCPrescTable[tmp];
/* ADCCLK clock frequency */
RCC_Clocks->ADCCLK_Frequency = RCC_Clocks->PCLK2_Frequency / presc;
}
/*******************************************************************************
* Function Name : RCC_AHBPeriphClockCmd
* Description : Enables or disables the AHB peripheral clock.
* Input : - RCC_AHBPeriph: specifies the AHB peripheral to gates its clock.
* This parameter can be any combination of the following values:
* - RCC_AHBPeriph_DMA
* - RCC_AHBPeriph_SRAM
* - RCC_AHBPeriph_FLITF
* SRAM and FLITF clock can be disabled only during sleep mode.
* - NewState: new state of the specified peripheral clock.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void RCC_AHBPeriphClockCmd(u32 RCC_AHBPeriph, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_RCC_AHB_PERIPH(RCC_AHBPeriph));
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
RCC->AHBENR |= RCC_AHBPeriph;
}
else
{
RCC->AHBENR &= ~RCC_AHBPeriph;
}
}
/*******************************************************************************
* Function Name : RCC_APB2PeriphClockCmd
* Description : Enables or disables the High Speed APB (APB2) peripheral clock.
* Input : - RCC_APB2Periph: specifies the APB2 peripheral to gates its
* clock.
* This parameter can be any combination of the following values:
* - RCC_APB2Periph_AFIO, RCC_APB2Periph_GPIOA, RCC_APB2Periph_GPIOB
* RCC_APB2Periph_GPIOC, RCC_APB2Periph_GPIOD, RCC_APB2Periph_GPIOE
* RCC_APB2Periph_ADC1, RCC_APB2Periph_ADC2, RCC_APB2Periph_TIM1
* RCC_APB2Periph_SPI1, RCC_APB2Periph_USART1, RCC_APB2Periph_ALL
* - NewState: new state of the specified peripheral clock.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void RCC_APB2PeriphClockCmd(u32 RCC_APB2Periph, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_RCC_APB2_PERIPH(RCC_APB2Periph));
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
RCC->APB2ENR |= RCC_APB2Periph;
}
else
{
RCC->APB2ENR &= ~RCC_APB2Periph;
}
}
/*******************************************************************************
* Function Name : RCC_APB1PeriphClockCmd
* Description : Enables or disables the Low Speed APB (APB1) peripheral clock.
* Input : - RCC_APB1Periph: specifies the APB1 peripheral to gates its
* clock.
* This parameter can be any combination of the following values:
* - RCC_APB1Periph_TIM2, RCC_APB1Periph_TIM3, RCC_APB1Periph_TIM4
* RCC_APB1Periph_WWDG, RCC_APB1Periph_SPI2, RCC_APB1Periph_USART2
* RCC_APB1Periph_USART3, RCC_APB1Periph_I2C1, RCC_APB1Periph_I2C2
* RCC_APB1Periph_USB, RCC_APB1Periph_CAN, RCC_APB1Periph_BKP
* RCC_APB1Periph_PWR, RCC_APB1Periph_ALL
* - NewState: new state of the specified peripheral clock.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void RCC_APB1PeriphClockCmd(u32 RCC_APB1Periph, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_RCC_APB1_PERIPH(RCC_APB1Periph));
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
RCC->APB1ENR |= RCC_APB1Periph;
}
else
{
RCC->APB1ENR &= ~RCC_APB1Periph;
}
}
/*******************************************************************************
* Function Name : RCC_APB2PeriphResetCmd
* Description : Forces or releases High Speed APB (APB2) peripheral reset.
* Input : - RCC_APB2Periph: specifies the APB2 peripheral to reset.
* This parameter can be any combination of the following values:
* - RCC_APB2Periph_AFIO, RCC_APB2Periph_GPIOA, RCC_APB2Periph_GPIOB
* RCC_APB2Periph_GPIOC, RCC_APB2Periph_GPIOD, RCC_APB2Periph_GPIOE
* RCC_APB2Periph_ADC1, RCC_APB2Periph_ADC2, RCC_APB2Periph_TIM1
* RCC_APB2Periph_SPI1, RCC_APB2Periph_USART1, RCC_APB2Periph_ALL
* - NewState: new state of the specified peripheral reset.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void RCC_APB2PeriphResetCmd(u32 RCC_APB2Periph, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_RCC_APB2_PERIPH(RCC_APB2Periph));
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
RCC->APB2RSTR |= RCC_APB2Periph;
}
else
{
RCC->APB2RSTR &= ~RCC_APB2Periph;
}
}
/*******************************************************************************
* Function Name : RCC_APB1PeriphResetCmd
* Description : Forces or releases Low Speed APB (APB1) peripheral reset.
* Input : - RCC_APB1Periph: specifies the APB1 peripheral to reset.
* This parameter can be any combination of the following values:
* - RCC_APB1Periph_TIM2, RCC_APB1Periph_TIM3, RCC_APB1Periph_TIM4
* RCC_APB1Periph_WWDG, RCC_APB1Periph_SPI2, RCC_APB1Periph_USART2
* RCC_APB1Periph_USART3, RCC_APB1Periph_I2C1, RCC_APB1Periph_I2C2
* RCC_APB1Periph_USB, RCC_APB1Periph_CAN, RCC_APB1Periph_BKP
* RCC_APB1Periph_PWR, RCC_APB1Periph_ALL
* - NewState: new state of the specified peripheral clock.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void RCC_APB1PeriphResetCmd(u32 RCC_APB1Periph, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_RCC_APB1_PERIPH(RCC_APB1Periph));
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
RCC->APB1RSTR |= RCC_APB1Periph;
}
else
{
RCC->APB1RSTR &= ~RCC_APB1Periph;
}
}
/*******************************************************************************
* Function Name : RCC_BackupResetCmd
* Description : Forces or releases the Backup domain reset.
* Input : - NewState: new state of the Backup domain reset.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void RCC_BackupResetCmd(FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
*(vu32 *) BDCR_BDRST_BB = (u32)NewState;
}
/*******************************************************************************
* Function Name : RCC_ClockSecuritySystemCmd
* Description : Enables or disables the Clock Security System.
* Input : - NewState: new state of the Clock Security System..
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void RCC_ClockSecuritySystemCmd(FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
*(vu32 *) CR_CSSON_BB = (u32)NewState;
}
/*******************************************************************************
* Function Name : RCC_MCOConfig
* Description : Selects the clock source to output on MCO pin.
* Input : - RCC_MCO: specifies the clock source to output.
* This parameter can be one of the following values:
* - RCC_MCO_NoClock: No clock selected
* - RCC_MCO_SYSCLK: System clock selected
* - RCC_MCO_HSI: HSI oscillator clock selected
* - RCC_MCO_HSE: HSE oscillator clock selected
* - RCC_MCO_PLLCLK_Div2: PLL clock divided by 2 selected
* Output : None
* Return : None
*******************************************************************************/
void RCC_MCOConfig(u8 RCC_MCO)
{
/* Check the parameters */
assert(IS_RCC_MCO(RCC_MCO));
/* Perform Byte access to MCO[26:24] bits to select the MCO source */
*(vu8 *) 0x40021007 = RCC_MCO;
}
/*******************************************************************************
* Function Name : RCC_GetFlagStatus
* Description : Checks whether the specified RCC flag is set or not.
* Input : - RCC_FLAG: specifies the flag to check.
* This parameter can be one of the following values:
* - RCC_FLAG_HSIRDY: HSI oscillator clock ready
* - RCC_FLAG_HSERDY: HSE oscillator clock ready
* - RCC_FLAG_PLLRDY: PLL clock ready
* - RCC_FLAG_LSERDY: LSE oscillator clock ready
* - RCC_FLAG_LSIRDY: LSI oscillator clock ready
* - RCC_FLAG_PINRST: Pin reset
* - RCC_FLAG_PORRST: POR/PDR reset
* - RCC_FLAG_SFTRST: Software reset
* - RCC_FLAG_IWDGRST: Independent Watchdog reset
* - RCC_FLAG_WWDGRST: Window Watchdog reset
* - RCC_FLAG_LPWRRST: Low Power reset
* Output : None
* Return : The new state of RCC_FLAG (SET or RESET).
*******************************************************************************/
FlagStatus RCC_GetFlagStatus(u8 RCC_FLAG)
{
u32 tmp = 0;
u32 statusreg = 0;
FlagStatus bitstatus = RESET;
/* Check the parameters */
assert(IS_RCC_FLAG(RCC_FLAG));
/* Get the RCC register index */
tmp = RCC_FLAG >> 5;
if (tmp == 1) /* The flag to check is in CR register */
{
statusreg = RCC->CR;
}
else if (tmp == 2) /* The flag to check is in BDCR register */
{
statusreg = RCC->BDCR;
}
else /* The flag to check is in CSR register */
{
statusreg = RCC->CSR;
}
/* Get the flag position */
tmp = RCC_FLAG & FLAG_Mask;
if ((statusreg & ((u32)1 << tmp)) != (u32)RESET)
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
/* Return the flag status */
return bitstatus;
}
/*******************************************************************************
* Function Name : RCC_ClearFlag
* Description : Clears the RCC reset flags.
* The reset flags are: RCC_FLAG_PINRST, RCC_FLAG_PORRST,
* RCC_FLAG_SFTRST, RCC_FLAG_IWDGRST, RCC_FLAG_WWDGRST,
* RCC_FLAG_LPWRRST
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void RCC_ClearFlag(void)
{
/* Set RMVF bit to clear the reset flags */
RCC->CSR |= CSR_RMVF_Set;
}
/*******************************************************************************
* Function Name : RCC_GetITStatus
* Description : Checks whether the specified RCC interrupt has occurred or not.
* Input : - RCC_IT: specifies the RCC interrupt source to check.
* This parameter can be one of the following values:
* - RCC_IT_LSIRDY: LSI ready interrupt
* - RCC_IT_LSERDY: LSE ready interrupt
* - RCC_IT_HSIRDY: HSI ready interrupt
* - RCC_IT_HSERDY: HSE ready interrupt
* - RCC_IT_PLLRDY: PLL ready interrupt
* - RCC_IT_CSS: Clock Security System interrupt
* Output : None
* Return : The new state of RCC_IT (SET or RESET).
*******************************************************************************/
ITStatus RCC_GetITStatus(u8 RCC_IT)
{
ITStatus bitstatus = RESET;
/* Check the parameters */
assert(IS_RCC_GET_IT(RCC_IT));
/* Check the status of the specified RCC interrupt */
if ((RCC->CIR & RCC_IT) != (u32)RESET)
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
/* Return the RCC_IT status */
return bitstatus;
}
/*******************************************************************************
* Function Name : RCC_ClearITPendingBit
* Description : Clears the RCC’s interrupt pending bits.
* Input : - RCC_IT: specifies the interrupt pending bit to clear.
* This parameter can be any combination of the following values:
* - RCC_IT_LSIRDY: LSI ready interrupt
* - RCC_IT_LSERDY: LSE ready interrupt
* - RCC_IT_HSIRDY: HSI ready interrupt
* - RCC_IT_HSERDY: HSE ready interrupt
* - RCC_IT_PLLRDY: PLL ready interrupt
* - RCC_IT_CSS: Clock Security System interrupt
* Output : None
* Return : None
*******************************************************************************/
void RCC_ClearITPendingBit(u8 RCC_IT)
{
/* Check the parameters */
assert(IS_RCC_CLEAR_IT(RCC_IT));
/* Perform Byte access to RCC_CIR[23:16] bits to clear the selected interrupt
pending bits */
*(vu8 *) 0x4002100A = RCC_IT;
}
/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/