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CH32V00x/User/system_ch32v00x.c

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/********************************** (C) COPYRIGHT *******************************
* File Name : system_ch32v00x.c
* Author : WCH
* Version : V1.0.0
* Date : 2022/08/08
* Description : CH32V00x Device Peripheral Access Layer System Source File.
* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
* SPDX-License-Identifier: Apache-2.0
*********************************************************************************/
#include <ch32v00x.h>
/*
* Uncomment the line corresponding to the desired System clock (SYSCLK) frequency (after
* reset the HSI is used as SYSCLK source).
* If none of the define below is enabled, the HSI is used as System clock source.
*/
//#define SYSCLK_FREQ_8MHz_HSI 8000000
//#define SYSCLK_FREQ_24MHZ_HSI HSI_VALUE
#define SYSCLK_FREQ_48MHZ_HSI 48000000
//#define SYSCLK_FREQ_8MHz_HSE 8000000
//#define SYSCLK_FREQ_24MHz_HSE HSE_VALUE
//#define SYSCLK_FREQ_48MHz_HSE 48000000
/* Clock Definitions */
#ifdef SYSCLK_FREQ_8MHz_HSI
uint32_t SystemCoreClock = SYSCLK_FREQ_8MHz_HSI; /* System Clock Frequency (Core Clock) */
#elif defined SYSCLK_FREQ_24MHZ_HSI
uint32_t SystemCoreClock = SYSCLK_FREQ_24MHZ_HSI; /* System Clock Frequency (Core Clock) */
#elif defined SYSCLK_FREQ_48MHZ_HSI
uint32_t SystemCoreClock = SYSCLK_FREQ_48MHZ_HSI; /* System Clock Frequency (Core Clock) */
#elif defined SYSCLK_FREQ_8MHz_HSE
uint32_t SystemCoreClock = SYSCLK_FREQ_8MHz_HSE; /* System Clock Frequency (Core Clock) */
#elif defined SYSCLK_FREQ_24MHz_HSE
uint32_t SystemCoreClock = SYSCLK_FREQ_24MHz_HSE; /* System Clock Frequency (Core Clock) */
#elif defined SYSCLK_FREQ_48MHz_HSE
uint32_t SystemCoreClock = SYSCLK_FREQ_48MHz_HSE; /* System Clock Frequency (Core Clock) */
#else
uint32_t SystemCoreClock = HSI_VALUE;
#endif
__I uint8_t AHBPrescTable[16] = {1, 2, 3, 4, 5, 6, 7, 8, 1, 2, 3, 4, 5, 6, 7, 8};
/* system_private_function_proto_types */
static void SetSysClock(void);
#ifdef SYSCLK_FREQ_8MHz_HSI
static void SetSysClockTo_8MHz_HSI(void);
#elif defined SYSCLK_FREQ_24MHZ_HSI
static void SetSysClockTo_24MHZ_HSI(void);
#elif defined SYSCLK_FREQ_48MHZ_HSI
static void SetSysClockTo_48MHZ_HSI(void);
#elif defined SYSCLK_FREQ_8MHz_HSE
static void SetSysClockTo_8MHz_HSE(void);
#elif defined SYSCLK_FREQ_24MHz_HSE
static void SetSysClockTo_24MHz_HSE(void);
#elif defined SYSCLK_FREQ_48MHz_HSE
static void SetSysClockTo_48MHz_HSE(void);
#endif
/*********************************************************************
* @fn SystemInit
*
* @brief Setup the microcontroller system Initialize the Embedded Flash Interface,
* the PLL and update the SystemCoreClock variable.
*
* @return none
*/
void SystemInit (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;
SetSysClock();
}
/*********************************************************************
* @fn SystemCoreClockUpdate
*
* @brief Update SystemCoreClock variable according to Clock Register Values.
*
* @return none
*/
void SystemCoreClockUpdate (void)
{
uint32_t tmp = 0, pllsource = 0;
tmp = RCC->CFGR0 & RCC_SWS;
switch (tmp)
{
case 0x00:
SystemCoreClock = HSI_VALUE;
break;
case 0x04:
SystemCoreClock = HSE_VALUE;
break;
case 0x08:
pllsource = RCC->CFGR0 & RCC_PLLSRC;
if (pllsource == 0x00)
{
SystemCoreClock = HSI_VALUE * 2;
}
else
{
SystemCoreClock = HSE_VALUE * 2;
}
break;
default:
SystemCoreClock = HSI_VALUE;
break;
}
tmp = AHBPrescTable[((RCC->CFGR0 & RCC_HPRE) >> 4)];
if(((RCC->CFGR0 & RCC_HPRE) >> 4) < 8)
{
SystemCoreClock /= tmp;
}
else
{
SystemCoreClock >>= tmp;
}
}
/*********************************************************************
* @fn SetSysClock
*
* @brief Configures the System clock frequency, HCLK, PCLK2 and PCLK1 prescalers.
*
* @return none
*/
static void SetSysClock(void)
{
#ifdef SYSCLK_FREQ_8MHz_HSI
SetSysClockTo_8MHz_HSI();
#elif defined SYSCLK_FREQ_24MHZ_HSI
SetSysClockTo_24MHZ_HSI();
#elif defined SYSCLK_FREQ_48MHZ_HSI
SetSysClockTo_48MHZ_HSI();
#elif defined SYSCLK_FREQ_8MHz_HSE
SetSysClockTo_8MHz_HSE();
#elif defined SYSCLK_FREQ_24MHz_HSE
SetSysClockTo_24MHz_HSE();
#elif defined SYSCLK_FREQ_48MHz_HSE
SetSysClockTo_48MHz_HSE();
#endif
/* If none of the define above is enabled, the HSI is used as System clock<63><6B>
* source (default after reset)
*/
}
#ifdef SYSCLK_FREQ_8MHz_HSI
/*********************************************************************
* @fn SetSysClockTo_8MHz_HSI
*
* @brief Sets HSE as System clock source and configure HCLK, PCLK2 and PCLK1 prescalers.
*
* @return none
*/
static void SetSysClockTo_8MHz_HSI(void)
{
/* Flash 0 wait state */
FLASH->ACTLR &= (uint32_t)((uint32_t)~FLASH_ACTLR_LATENCY);
FLASH->ACTLR |= (uint32_t)FLASH_ACTLR_LATENCY_0;
/* HCLK = SYSCLK = APB1 */
RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV3;
}
#elif defined SYSCLK_FREQ_24MHZ_HSI
/*********************************************************************
* @fn SetSysClockTo_24MHZ_HSI
*
* @brief Sets System clock frequency to 24MHz and configure HCLK, PCLK2 and PCLK1 prescalers.
*
* @return none
*/
static void SetSysClockTo_24MHZ_HSI(void)
{
/* Flash 0 wait state */
FLASH->ACTLR &= (uint32_t)((uint32_t)~FLASH_ACTLR_LATENCY);
FLASH->ACTLR |= (uint32_t)FLASH_ACTLR_LATENCY_0;
/* HCLK = SYSCLK = APB1 */
RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV1;
}
#elif defined SYSCLK_FREQ_48MHZ_HSI
/*********************************************************************
* @fn SetSysClockTo_48MHZ_HSI
*
* @brief Sets System clock frequency to 48MHz and configure HCLK, PCLK2 and PCLK1 prescalers.
*
* @return none
*/
static void SetSysClockTo_48MHZ_HSI(void)
{
/* Flash 0 wait state */
FLASH->ACTLR &= (uint32_t)((uint32_t)~FLASH_ACTLR_LATENCY);
FLASH->ACTLR |= (uint32_t)FLASH_ACTLR_LATENCY_1;
/* HCLK = SYSCLK = APB1 */
RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV1;
/* PLL configuration: PLLCLK = HSI * 2 = 48 MHz */
RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_PLLSRC));
RCC->CFGR0 |= (uint32_t)(RCC_PLLSRC_HSI_Mul2);
/* Enable PLL */
RCC->CTLR |= RCC_PLLON;
/* Wait till PLL is ready */
while((RCC->CTLR & RCC_PLLRDY) == 0)
{
}
/* Select PLL as system clock source */
RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_SW));
RCC->CFGR0 |= (uint32_t)RCC_SW_PLL;
/* Wait till PLL is used as system clock source */
while ((RCC->CFGR0 & (uint32_t)RCC_SWS) != (uint32_t)0x08)
{
}
}
#elif defined SYSCLK_FREQ_8MHz_HSE
/*********************************************************************
* @fn SetSysClockTo_8MHz_HSE
*
* @brief Sets System clock frequency to 56MHz and configure HCLK, PCLK2 and PCLK1 prescalers.
*
* @return none
*/
static void SetSysClockTo_8MHz_HSE(void)
{
__IO uint32_t StartUpCounter = 0, HSEStatus = 0;
/* Close PA0-PA1 GPIO function */
RCC->APB2PCENR |= RCC_AFIOEN;
AFIO->PCFR1 |= (1<<15);
RCC->CTLR |= ((uint32_t)RCC_HSEON);
/* Wait till HSE is ready and if Time out is reached exit */
do
{
HSEStatus = RCC->CTLR & RCC_HSERDY;
StartUpCounter++;
} while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
RCC->APB2PCENR |= RCC_AFIOEN;
AFIO->PCFR1 |= (1<<15);
if ((RCC->CTLR & RCC_HSERDY) != RESET)
{
HSEStatus = (uint32_t)0x01;
}
else
{
HSEStatus = (uint32_t)0x00;
}
if (HSEStatus == (uint32_t)0x01)
{
/* Flash 0 wait state */
FLASH->ACTLR &= (uint32_t)((uint32_t)~FLASH_ACTLR_LATENCY);
FLASH->ACTLR |= (uint32_t)FLASH_ACTLR_LATENCY_0;
/* HCLK = SYSCLK = APB1 */
RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV3;
/* Select HSE as system clock source */
RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_SW));
RCC->CFGR0 |= (uint32_t)RCC_SW_HSE;
/* Wait till HSE is used as system clock source */
while ((RCC->CFGR0 & (uint32_t)RCC_SWS) != (uint32_t)0x04)
{
}
}
else
{
/*
* If HSE fails to start-up, the application will have wrong clock
* configuration. User can add here some code to deal with this error
*/
}
}
#elif defined SYSCLK_FREQ_24MHz_HSE
/*********************************************************************
* @fn SetSysClockTo_24MHz_HSE
*
* @brief Sets System clock frequency to 72MHz and configure HCLK, PCLK2 and PCLK1 prescalers.
*
* @return none
*/
static void SetSysClockTo_24MHz_HSE(void)
{
__IO uint32_t StartUpCounter = 0, HSEStatus = 0;
/* Close PA0-PA1 GPIO function */
RCC->APB2PCENR |= RCC_AFIOEN;
AFIO->PCFR1 |= (1<<15);
RCC->CTLR |= ((uint32_t)RCC_HSEON);
/* Wait till HSE is ready and if Time out is reached exit */
do
{
HSEStatus = RCC->CTLR & RCC_HSERDY;
StartUpCounter++;
} while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
RCC->APB2PCENR |= RCC_AFIOEN;
AFIO->PCFR1 |= (1<<15);
if ((RCC->CTLR & RCC_HSERDY) != RESET)
{
HSEStatus = (uint32_t)0x01;
}
else
{
HSEStatus = (uint32_t)0x00;
}
if (HSEStatus == (uint32_t)0x01)
{
/* Flash 0 wait state */
FLASH->ACTLR &= (uint32_t)((uint32_t)~FLASH_ACTLR_LATENCY);
FLASH->ACTLR |= (uint32_t)FLASH_ACTLR_LATENCY_0;
/* HCLK = SYSCLK = APB1 */
RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV1;
/* Select HSE as system clock source */
RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_SW));
RCC->CFGR0 |= (uint32_t)RCC_SW_HSE;
/* Wait till HSE is used as system clock source */
while ((RCC->CFGR0 & (uint32_t)RCC_SWS) != (uint32_t)0x04)
{
}
}
else
{
/*
* If HSE fails to start-up, the application will have wrong clock
* configuration. User can add here some code to deal with this error
*/
}
}
#elif defined SYSCLK_FREQ_48MHz_HSE
/*********************************************************************
* @fn SetSysClockTo_48MHz_HSE
*
* @brief Sets System clock frequency to 72MHz and configure HCLK, PCLK2 and PCLK1 prescalers.
*
* @return none
*/
static void SetSysClockTo_48MHz_HSE(void)
{
__IO uint32_t StartUpCounter = 0, HSEStatus = 0;
/* Close PA0-PA1 GPIO function */
RCC->APB2PCENR |= RCC_AFIOEN;
AFIO->PCFR1 |= (1<<15);
RCC->CTLR |= ((uint32_t)RCC_HSEON);
/* Wait till HSE is ready and if Time out is reached exit */
do
{
HSEStatus = RCC->CTLR & RCC_HSERDY;
StartUpCounter++;
} while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
if ((RCC->CTLR & RCC_HSERDY) != RESET)
{
HSEStatus = (uint32_t)0x01;
}
else
{
HSEStatus = (uint32_t)0x00;
}
if (HSEStatus == (uint32_t)0x01)
{
/* Flash 0 wait state */
FLASH->ACTLR &= (uint32_t)((uint32_t)~FLASH_ACTLR_LATENCY);
FLASH->ACTLR |= (uint32_t)FLASH_ACTLR_LATENCY_1;
/* HCLK = SYSCLK = APB1 */
RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV1;
/* PLL configuration: PLLCLK = HSE * 2 = 48 MHz */
RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_PLLSRC));
RCC->CFGR0 |= (uint32_t)(RCC_PLLSRC_HSE_Mul2);
/* Enable PLL */
RCC->CTLR |= RCC_PLLON;
/* Wait till PLL is ready */
while((RCC->CTLR & RCC_PLLRDY) == 0)
{
}
/* Select PLL as system clock source */
RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_SW));
RCC->CFGR0 |= (uint32_t)RCC_SW_PLL;
/* Wait till PLL is used as system clock source */
while ((RCC->CFGR0 & (uint32_t)RCC_SWS) != (uint32_t)0x08)
{
}
}
else
{
/*
* If HSE fails to start-up, the application will have wrong clock
* configuration. User can add here some code to deal with this error
*/
}
}
#endif
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