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dc32-retro-tech-addon/firmware/ch32v003_bootloader/periph/src/ch32v00x_rcc.c

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/********************************** (C) COPYRIGHT *******************************
* File Name : ch32v00x_rcc.c
* Author : WCH
* Version : V1.0.0
* Date : 2022/08/08
* Description : This file provides all the RCC firmware functions.
*********************************************************************************
* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
* Attention: This software (modified or not) and binary are used for
* microcontroller manufactured by Nanjing Qinheng Microelectronics.
*******************************************************************************/
#include <ch32v00x_rcc.h>
/* RCC registers bit address in the alias region */
#define RCC_OFFSET (RCC_BASE - PERIPH_BASE)
/* BDCTLR Register */
#define BDCTLR_OFFSET (RCC_OFFSET + 0x20)
/* RCC registers bit mask */
/* CTLR register bit mask */
#define CTLR_HSEBYP_Reset ((uint32_t)0xFFFBFFFF)
#define CTLR_HSEBYP_Set ((uint32_t)0x00040000)
#define CTLR_HSEON_Reset ((uint32_t)0xFFFEFFFF)
#define CTLR_HSEON_Set ((uint32_t)0x00010000)
#define CTLR_HSITRIM_Mask ((uint32_t)0xFFFFFF07)
#define CFGR0_PLL_Mask ((uint32_t)0xFFC0FFFF)
#define CFGR0_PLLMull_Mask ((uint32_t)0x003C0000)
#define CFGR0_PLLSRC_Mask ((uint32_t)0x00010000)
#define CFGR0_PLLXTPRE_Mask ((uint32_t)0x00020000)
#define CFGR0_SWS_Mask ((uint32_t)0x0000000C)
#define CFGR0_SW_Mask ((uint32_t)0xFFFFFFFC)
#define CFGR0_HPRE_Reset_Mask ((uint32_t)0xFFFFFF0F)
#define CFGR0_HPRE_Set_Mask ((uint32_t)0x000000F0)
#define CFGR0_PPRE1_Reset_Mask ((uint32_t)0xFFFFF8FF)
#define CFGR0_PPRE1_Set_Mask ((uint32_t)0x00000700)
#define CFGR0_PPRE2_Reset_Mask ((uint32_t)0xFFFFC7FF)
#define CFGR0_PPRE2_Set_Mask ((uint32_t)0x00003800)
#define CFGR0_ADCPRE_Reset_Mask ((uint32_t)0xFFFF07FF)
#define CFGR0_ADCPRE_Set_Mask ((uint32_t)0x0000F800)
/* RSTSCKR register bit mask */
#define RSTSCKR_RMVF_Set ((uint32_t)0x01000000)
/* RCC Flag Mask */
#define FLAG_Mask ((uint8_t)0x1F)
/* INTR register byte 2 (Bits[15:8]) base address */
#define INTR_BYTE2_ADDRESS ((uint32_t)0x40021009)
/* INTR register byte 3 (Bits[23:16]) base address */
#define INTR_BYTE3_ADDRESS ((uint32_t)0x4002100A)
/* CFGR0 register byte 4 (Bits[31:24]) base address */
#define CFGR0_BYTE4_ADDRESS ((uint32_t)0x40021007)
/* BDCTLR register base address */
#define BDCTLR_ADDRESS (PERIPH_BASE + BDCTLR_OFFSET)
static __I uint8_t APBAHBPrescTable[16] = {1, 2, 3, 4, 5, 6, 7, 8, 1, 2, 3, 4, 5, 6, 7, 8};
static __I uint8_t ADCPrescTable[20] = {2, 4, 6, 8, 4, 8, 12, 16, 8, 16, 24, 32, 16, 32, 48, 64, 32, 64, 96, 128};
/*********************************************************************
* @fn RCC_DeInit
*
* @brief Resets the RCC clock configuration to the default reset state.
*
* @return none
*/
void RCC_DeInit(void)
{
RCC->CTLR |= (uint32_t)0x00000001;
RCC->CFGR0 &= (uint32_t)0xFCFF0000;
RCC->CTLR &= (uint32_t)0xFEF6FFFF;
RCC->CTLR &= (uint32_t)0xFFFBFFFF;
RCC->CFGR0 &= (uint32_t)0xFFFEFFFF;
RCC->INTR = 0x009F0000;
}
/*********************************************************************
* @fn RCC_HSEConfig
*
* @brief Configures the External High Speed oscillator (HSE).
*
* @param RCC_HSE -
* RCC_HSE_OFF - HSE oscillator OFF.
* RCC_HSE_ON - HSE oscillator ON.
* RCC_HSE_Bypass - HSE oscillator bypassed with external clock.
* Note-
* HSE can not be stopped if it is used directly or through the PLL as system clock.
* @return none
*/
void RCC_HSEConfig(uint32_t RCC_HSE)
{
RCC->CTLR &= CTLR_HSEON_Reset;
RCC->CTLR &= CTLR_HSEBYP_Reset;
switch(RCC_HSE)
{
case RCC_HSE_ON:
RCC->CTLR |= CTLR_HSEON_Set;
break;
case RCC_HSE_Bypass:
RCC->CTLR |= CTLR_HSEBYP_Set | CTLR_HSEON_Set;
break;
default:
break;
}
}
/*********************************************************************
* @fn RCC_WaitForHSEStartUp
*
* @brief Waits for HSE start-up.
*
* @return READY - HSE oscillator is stable and ready to use.
* NoREADY - HSE oscillator not yet ready.
*/
ErrorStatus RCC_WaitForHSEStartUp(void)
{
__IO uint32_t StartUpCounter = 0;
ErrorStatus status = NoREADY;
FlagStatus HSEStatus = RESET;
do
{
HSEStatus = RCC_GetFlagStatus(RCC_FLAG_HSERDY);
StartUpCounter++;
} while((StartUpCounter != HSE_STARTUP_TIMEOUT) && (HSEStatus == RESET));
if(RCC_GetFlagStatus(RCC_FLAG_HSERDY) != RESET)
{
status = READY;
}
else
{
status = NoREADY;
}
return (status);
}
/*********************************************************************
* @fn RCC_AdjustHSICalibrationValue
*
* @brief Adjusts the Internal High Speed oscillator (HSI) calibration value.
*
* @param HSICalibrationValue - specifies the calibration trimming value.
* This parameter must be a number between 0 and 0x1F.
*
* @return none
*/
void RCC_AdjustHSICalibrationValue(uint8_t HSICalibrationValue)
{
uint32_t tmpreg = 0;
tmpreg = RCC->CTLR;
tmpreg &= CTLR_HSITRIM_Mask;
tmpreg |= (uint32_t)HSICalibrationValue << 3;
RCC->CTLR = tmpreg;
}
/*********************************************************************
* @fn RCC_HSICmd
*
* @brief Enables or disables the Internal High Speed oscillator (HSI).
*
* @param NewState - ENABLE or DISABLE.
*
* @return none
*/
void RCC_HSICmd(FunctionalState NewState)
{
if(NewState)
{
RCC->CTLR |= (1 << 0);
}
else
{
RCC->CTLR &= ~(1 << 0);
}
}
/*********************************************************************
* @fn RCC_PLLConfig
*
* @brief Configures the PLL clock source and multiplication factor.
*
* @param RCC_PLLSource - specifies the PLL entry clock source.
* RCC_PLLSource_HSI_MUL2 - HSI oscillator clock*2
* selected as PLL clock entry.
* RCC_PLLSource_HSE_MUL2 - HSE oscillator clock*2
* selected as PLL clock entry.
*
* @return none
*/
void RCC_PLLConfig(uint32_t RCC_PLLSource)
{
uint32_t tmpreg = 0;
tmpreg = RCC->CFGR0;
tmpreg &= CFGR0_PLL_Mask;
tmpreg |= RCC_PLLSource;
RCC->CFGR0 = tmpreg;
}
/*********************************************************************
* @fn RCC_PLLCmd
*
* @brief Enables or disables the PLL.
* Note-The PLL can not be disabled if it is used as system clock.
*
*
* @param NewState - ENABLE or DISABLE.
*
* @return none
*/
void RCC_PLLCmd(FunctionalState NewState)
{
if(NewState)
{
RCC->CTLR |= (1 << 24);
}
else
{
RCC->CTLR &= ~(1 << 24);
}
}
/*********************************************************************
* @fn RCC_SYSCLKConfig
*
* @brief Configures the system clock (SYSCLK).
*
* @param RCC_SYSCLKSource - specifies the clock source used as system clock.
* RCC_SYSCLKSource_HSI - HSI selected as system clock.
* RCC_SYSCLKSource_HSE - HSE selected as system clock.
* RCC_SYSCLKSource_PLLCLK - PLL selected as system clock.
*
* @return none
*/
void RCC_SYSCLKConfig(uint32_t RCC_SYSCLKSource)
{
uint32_t tmpreg = 0;
tmpreg = RCC->CFGR0;
tmpreg &= CFGR0_SW_Mask;
tmpreg |= RCC_SYSCLKSource;
RCC->CFGR0 = tmpreg;
}
/*********************************************************************
* @fn RCC_GetSYSCLKSource
*
* @brief Returns the clock source used as system clock.
*
* @return 0x00 - HSI used as system clock.
* 0x04 - HSE used as system clock.
* 0x08 - PLL used as system clock.
*/
uint8_t RCC_GetSYSCLKSource(void)
{
return ((uint8_t)(RCC->CFGR0 & CFGR0_SWS_Mask));
}
/*********************************************************************
* @fn RCC_HCLKConfig
*
* @brief Configures the AHB clock (HCLK).
*
* @param RCC_SYSCLK - defines the AHB clock divider. This clock is derived from
* the system clock (SYSCLK).
* RCC_SYSCLK_Div1 - AHB clock = SYSCLK.
* RCC_SYSCLK_Div2 - AHB clock = SYSCLK/2.
* RCC_SYSCLK_Div3 - AHB clock = SYSCLK/3.
* RCC_SYSCLK_Div4 - AHB clock = SYSCLK/4.
* RCC_SYSCLK_Div5 - AHB clock = SYSCLK/5.
* RCC_SYSCLK_Div6 - AHB clock = SYSCLK/6.
* RCC_SYSCLK_Div7 - AHB clock = SYSCLK/7.
* RCC_SYSCLK_Div8 - AHB clock = SYSCLK/8.
* RCC_SYSCLK_Div16 - AHB clock = SYSCLK/16.
* RCC_SYSCLK_Div32 - AHB clock = SYSCLK/32.
* RCC_SYSCLK_Div64 - AHB clock = SYSCLK/64.
* RCC_SYSCLK_Div128 - AHB clock = SYSCLK/128.
* RCC_SYSCLK_Div256 - AHB clock = SYSCLK/256.
*
* @return none
*/
void RCC_HCLKConfig(uint32_t RCC_SYSCLK)
{
uint32_t tmpreg = 0;
tmpreg = RCC->CFGR0;
tmpreg &= CFGR0_HPRE_Reset_Mask;
tmpreg |= RCC_SYSCLK;
RCC->CFGR0 = tmpreg;
}
/*********************************************************************
* @fn RCC_ITConfig
*
* @brief Enables or disables the specified RCC interrupts.
*
* @param RCC_IT - specifies the RCC interrupt sources to be enabled or disabled.
* RCC_IT_LSIRDY - LSI ready interrupt.
* RCC_IT_HSIRDY - HSI ready interrupt.
* RCC_IT_HSERDY - HSE ready interrupt.
* RCC_IT_PLLRDY - PLL ready interrupt.
* NewState - ENABLE or DISABLE.
*
* @return none
*/
void RCC_ITConfig(uint8_t RCC_IT, FunctionalState NewState)
{
if(NewState != DISABLE)
{
*(__IO uint8_t *)INTR_BYTE2_ADDRESS |= RCC_IT;
}
else
{
*(__IO uint8_t *)INTR_BYTE2_ADDRESS &= (uint8_t)~RCC_IT;
}
}
/*********************************************************************
* @fn RCC_ADCCLKConfig
*
* @brief Configures the ADC clock (ADCCLK).
*
* @param RCC_PCLK2 - defines the ADC clock divider. This clock is derived from
* the APB2 clock (PCLK2).
* 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.
* RCC_PCLK2_Div12 - ADC clock = PCLK2/12.
* RCC_PCLK2_Div16 - ADC clock = PCLK2/16.
* RCC_PCLK2_Div24 - ADC clock = PCLK2/24.
* RCC_PCLK2_Div32 - ADC clock = PCLK2/32.
* RCC_PCLK2_Div48 - ADC clock = PCLK2/48.
* RCC_PCLK2_Div64 - ADC clock = PCLK2/64.
* RCC_PCLK2_Div96 - ADC clock = PCLK2/96.
* RCC_PCLK2_Div128 - ADC clock = PCLK2/128.
*
* @return none
*/
void RCC_ADCCLKConfig(uint32_t RCC_PCLK2)
{
uint32_t tmpreg = 0;
tmpreg = RCC->CFGR0;
tmpreg &= CFGR0_ADCPRE_Reset_Mask;
tmpreg |= RCC_PCLK2;
RCC->CFGR0 = tmpreg;
}
/*********************************************************************
* @fn RCC_LSICmd
*
* @brief Enables or disables the Internal Low Speed oscillator (LSI).
* Note-
* LSI can not be disabled if the IWDG is running.
*
* @param NewState - ENABLE or DISABLE.
*
* @return none
*/
void RCC_LSICmd(FunctionalState NewState)
{
if(NewState)
{
RCC->RSTSCKR |= (1 << 0);
}
else
{
RCC->RSTSCKR &= ~(1 << 0);
}
}
/*********************************************************************
* @fn RCC_GetClocksFreq
*
* @brief The result of this function could be not correct when using
* fractional value for HSE crystal.
*
* @param RCC_Clocks - pointer to a RCC_ClocksTypeDef structure which will hold
* the clocks frequencies.
*
* @return none
*/
void RCC_GetClocksFreq(RCC_ClocksTypeDef *RCC_Clocks)
{
uint32_t tmp = 0, pllsource = 0, presc = 0;
tmp = RCC->CFGR0 & CFGR0_SWS_Mask;
switch(tmp)
{
case 0x00:
RCC_Clocks->SYSCLK_Frequency = HSI_VALUE;
break;
case 0x04:
RCC_Clocks->SYSCLK_Frequency = HSE_VALUE;
break;
case 0x08:
pllsource = RCC->CFGR0 & CFGR0_PLLSRC_Mask;
if(pllsource == 0x00)
{
RCC_Clocks->SYSCLK_Frequency = HSI_VALUE * 2;
}
else
{
RCC_Clocks->SYSCLK_Frequency = HSE_VALUE * 2;
}
break;
default:
RCC_Clocks->SYSCLK_Frequency = HSI_VALUE;
break;
}
tmp = RCC->CFGR0 & CFGR0_HPRE_Set_Mask;
tmp = tmp >> 4;
presc = APBAHBPrescTable[tmp];
if(((RCC->CFGR0 & CFGR0_HPRE_Set_Mask) >> 4) < 8)
{
RCC_Clocks->HCLK_Frequency = RCC_Clocks->SYSCLK_Frequency / presc;
}
else
{
RCC_Clocks->HCLK_Frequency = RCC_Clocks->SYSCLK_Frequency >> presc;
}
RCC_Clocks->PCLK1_Frequency = RCC_Clocks->HCLK_Frequency;
RCC_Clocks->PCLK2_Frequency = RCC_Clocks->HCLK_Frequency;
tmp = RCC->CFGR0 & CFGR0_ADCPRE_Set_Mask;
tmp = tmp >> 11;
tmp = ((tmp & 0x18) >> 3) | ((tmp & 0x7) << 2);
if((tmp & 0x13) >= 4)
{
tmp -= 12;
}
presc = ADCPrescTable[tmp];
RCC_Clocks->ADCCLK_Frequency = RCC_Clocks->PCLK2_Frequency / presc;
}
/*********************************************************************
* @fn RCC_AHBPeriphClockCmd
*
* @brief Enables or disables the AHB peripheral clock.
*
* @param RCC_AHBPeriph - specifies the AHB peripheral to gates its clock.
* RCC_AHBPeriph_DMA1.
* RCC_AHBPeriph_SRAM.
* Note-
* SRAM clock can be disabled only during sleep mode.
* NewState: ENABLE or DISABLE.
*
* @return none
*/
void RCC_AHBPeriphClockCmd(uint32_t RCC_AHBPeriph, FunctionalState NewState)
{
if(NewState != DISABLE)
{
RCC->AHBPCENR |= RCC_AHBPeriph;
}
else
{
RCC->AHBPCENR &= ~RCC_AHBPeriph;
}
}
/*********************************************************************
* @fn RCC_APB2PeriphClockCmd
*
* @brief Enables or disables the High Speed APB (APB2) peripheral clock.
*
* @param RCC_APB2Periph - specifies the APB2 peripheral to gates its clock.
* RCC_APB2Periph_AFIO.
* RCC_APB2Periph_GPIOA.
* RCC_APB2Periph_GPIOC.
* RCC_APB2Periph_GPIOD.
* RCC_APB2Periph_ADC1.
* RCC_APB2Periph_TIM1.
* RCC_APB2Periph_SPI1.
* RCC_APB2Periph_USART1.
* NewState - ENABLE or DISABLE
*
* @return none
*/
void RCC_APB2PeriphClockCmd(uint32_t RCC_APB2Periph, FunctionalState NewState)
{
if(NewState != DISABLE)
{
RCC->APB2PCENR |= RCC_APB2Periph;
}
else
{
RCC->APB2PCENR &= ~RCC_APB2Periph;
}
}
/*********************************************************************
* @fn RCC_APB1PeriphClockCmd
*
* @brief Enables or disables the Low Speed APB (APB1) peripheral clock.
*
* @param RCC_APB1Periph - specifies the APB1 peripheral to gates its clock.
* RCC_APB1Periph_TIM2.
* RCC_APB1Periph_WWDG.
* RCC_APB1Periph_I2C1.
* RCC_APB1Periph_PWR.
* NewState - ENABLE or DISABLE.
*
* @return none
*/
void RCC_APB1PeriphClockCmd(uint32_t RCC_APB1Periph, FunctionalState NewState)
{
if(NewState != DISABLE)
{
RCC->APB1PCENR |= RCC_APB1Periph;
}
else
{
RCC->APB1PCENR &= ~RCC_APB1Periph;
}
}
/*********************************************************************
* @fn RCC_APB2PeriphResetCmd
*
* @brief Forces or releases High Speed APB (APB2) peripheral reset.
*
* @param RCC_APB2Periph - specifies the APB2 peripheral to reset.
* RCC_APB2Periph_AFIO.
* RCC_APB2Periph_GPIOA.
* RCC_APB2Periph_GPIOC.
* RCC_APB2Periph_GPIOD.
* RCC_APB2Periph_ADC1.
* RCC_APB2Periph_TIM1.
* RCC_APB2Periph_SPI1.
* RCC_APB2Periph_USART1.
* NewState - ENABLE or DISABLE
*
* @return none
*/
void RCC_APB2PeriphResetCmd(uint32_t RCC_APB2Periph, FunctionalState NewState)
{
if(NewState != DISABLE)
{
RCC->APB2PRSTR |= RCC_APB2Periph;
}
else
{
RCC->APB2PRSTR &= ~RCC_APB2Periph;
}
}
/*********************************************************************
* @fn RCC_APB1PeriphResetCmd
*
* @brief Forces or releases Low Speed APB (APB1) peripheral reset.
*
* @param RCC_APB1Periph - specifies the APB1 peripheral to reset.
* RCC_APB1Periph_TIM2.
* RCC_APB1Periph_WWDG.
* RCC_APB1Periph_I2C1.
* RCC_APB1Periph_PWR.
* NewState - ENABLE or DISABLE.
*
* @return none
*/
void RCC_APB1PeriphResetCmd(uint32_t RCC_APB1Periph, FunctionalState NewState)
{
if(NewState != DISABLE)
{
RCC->APB1PRSTR |= RCC_APB1Periph;
}
else
{
RCC->APB1PRSTR &= ~RCC_APB1Periph;
}
}
/*********************************************************************
* @fn RCC_ClockSecuritySystemCmd
*
* @brief Enables or disables the Clock Security System.
*
* @param NewState - ENABLE or DISABLE.
*
* @return none
*/
void RCC_ClockSecuritySystemCmd(FunctionalState NewState)
{
if(NewState)
{
RCC->CTLR |= (1 << 19);
}
else
{
RCC->CTLR &= ~(1 << 19);
}
}
/*********************************************************************
* @fn RCC_MCOConfig
*
* @brief Selects the clock source to output on MCO pin.
*
* @param RCC_MCO - specifies the clock source to output.
* 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 - PLL clock selected.
*
* @return none
*/
void RCC_MCOConfig(uint8_t RCC_MCO)
{
*(__IO uint8_t *)CFGR0_BYTE4_ADDRESS = RCC_MCO;
}
/*********************************************************************
* @fn RCC_GetFlagStatus
*
* @brief Checks whether the specified RCC flag is set or not.
*
* @param RCC_FLAG - specifies the flag to check.
* RCC_FLAG_HSIRDY - HSI oscillator clock ready.
* RCC_FLAG_HSERDY - HSE oscillator clock ready.
* RCC_FLAG_PLLRDY - PLL 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.
*
* @return FlagStatus - SET or RESET.
*/
FlagStatus RCC_GetFlagStatus(uint8_t RCC_FLAG)
{
uint32_t tmp = 0;
uint32_t statusreg = 0;
FlagStatus bitstatus = RESET;
tmp = RCC_FLAG >> 5;
if(tmp == 1)
{
statusreg = RCC->CTLR;
}
else
{
statusreg = RCC->RSTSCKR;
}
tmp = RCC_FLAG & FLAG_Mask;
if((statusreg & ((uint32_t)1 << tmp)) != (uint32_t)RESET)
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
/*********************************************************************
* @fn RCC_ClearFlag
*
* @brief Clears the RCC reset flags.
* Note-
* The reset flags are: RCC_FLAG_PINRST, RCC_FLAG_PORRST, RCC_FLAG_SFTRST,
* RCC_FLAG_IWDGRST, RCC_FLAG_WWDGRST, RCC_FLAG_LPWRRST
* @return none
*/
void RCC_ClearFlag(void)
{
RCC->RSTSCKR |= RSTSCKR_RMVF_Set;
}
/*********************************************************************
* @fn RCC_GetITStatus
*
* @brief Checks whether the specified RCC interrupt has occurred or not.
*
* @param RCC_IT - specifies the RCC interrupt source to check.
* RCC_IT_LSIRDY - LSI 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.
*
* @return ITStatus - SET or RESET.
*/
ITStatus RCC_GetITStatus(uint8_t RCC_IT)
{
ITStatus bitstatus = RESET;
if((RCC->INTR & RCC_IT) != (uint32_t)RESET)
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
/*********************************************************************
* @fn RCC_ClearITPendingBit
*
* @brief Clears the RCC's interrupt pending bits.
*
* @param RCC_IT - specifies the interrupt pending bit to clear.
* RCC_IT_LSIRDY - LSI 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.
*
* @return none
*/
void RCC_ClearITPendingBit(uint8_t RCC_IT)
{
*(__IO uint8_t *)INTR_BYTE3_ADDRESS = RCC_IT;
}
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