242 lines
7.1 KiB
C
242 lines
7.1 KiB
C
/********************************** (C) COPYRIGHT *******************************
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* File Name : system_ch32x035.c
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* Author : WCH
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* Version : V1.0.0
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* Date : 2023/04/06
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* Description : CH32X035 Device Peripheral Access Layer System Source File.
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*********************************************************************************
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* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
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* Attention: This software (modified or not) and binary are used for
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* microcontroller manufactured by Nanjing Qinheng Microelectronics.
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*******************************************************************************/
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#include "ch32x035.h"
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/*
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* Uncomment the line corresponding to the desired System clock (SYSCLK) frequency (after
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* reset the HSI is used as SYSCLK source).
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*/
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//#define SYSCLK_FREQ_8MHz_HSI 8000000
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//#define SYSCLK_FREQ_12MHz_HSI 12000000
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//#define SYSCLK_FREQ_16MHz_HSI 16000000
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//#define SYSCLK_FREQ_24MHz_HSI 24000000
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#define SYSCLK_FREQ_48MHz_HSI HSI_VALUE
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/* Clock Definitions */
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#ifdef SYSCLK_FREQ_8MHz_HSI
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uint32_t SystemCoreClock = SYSCLK_FREQ_8MHz_HSI; /* System Clock Frequency (Core Clock) */
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#elif defined SYSCLK_FREQ_12MHz_HSI
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uint32_t SystemCoreClock = SYSCLK_FREQ_12MHz_HSI; /* System Clock Frequency (Core Clock) */
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#elif defined SYSCLK_FREQ_16MHz_HSI
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uint32_t SystemCoreClock = SYSCLK_FREQ_16MHz_HSI; /* System Clock Frequency (Core Clock) */
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#elif defined SYSCLK_FREQ_24MHz_HSI
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uint32_t SystemCoreClock = SYSCLK_FREQ_24MHz_HSI; /* System Clock Frequency (Core Clock) */
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#else
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uint32_t SystemCoreClock = HSI_VALUE; /* System Clock Frequency (Core Clock) */
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#endif
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__I uint8_t AHBPrescTable[16] = {1, 2, 3, 4, 5, 6, 7, 8, 1, 2, 3, 4, 5, 6, 7, 8};
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/* system_private_function_proto_types */
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static void SetSysClock(void);
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#ifdef SYSCLK_FREQ_8MHz_HSI
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static void SetSysClockTo8_HSI( void );
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#elif defined SYSCLK_FREQ_12MHz_HSI
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static void SetSysClockTo12_HSI( void );
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#elif defined SYSCLK_FREQ_16MHz_HSI
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static void SetSysClockTo16_HSI( void );
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#elif defined SYSCLK_FREQ_24MHz_HSI
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static void SetSysClockTo24_HSI( void );
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#elif defined SYSCLK_FREQ_48MHz_HSI
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static void SetSysClockTo48_HSI( void );
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#endif
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/*********************************************************************
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* @fn SystemInit
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*
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* @brief Setup the microcontroller system Initialize the Embedded Flash Interface,
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* update the SystemCoreClock variable.
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*
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* @return none
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*/
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void SystemInit (void)
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{
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RCC->CTLR |= (uint32_t)0x00000001;
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RCC->CFGR0 |= (uint32_t)0x00000050;
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RCC->CFGR0 &= (uint32_t)0xF8FFFF5F;
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SetSysClock();
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}
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/*********************************************************************
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* @fn SystemCoreClockUpdate
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*
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* @brief Update SystemCoreClock variable according to Clock Register Values.
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*
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* @return none
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*/
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void SystemCoreClockUpdate (void)
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{
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uint32_t tmp = 0;
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SystemCoreClock = HSI_VALUE;
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tmp = AHBPrescTable[((RCC->CFGR0 & RCC_HPRE) >> 4)];
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if(((RCC->CFGR0 & RCC_HPRE) >> 4) < 8)
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{
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SystemCoreClock /= tmp;
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}
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else
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{
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SystemCoreClock >>= tmp;
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}
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}
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/*********************************************************************
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* @fn SetSysClock
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*
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* @brief Configures the System clock frequency, HCLK prescalers.
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*
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* @return none
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*/
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static void SetSysClock(void)
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{
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// GPIO_IPD_Unused();
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#ifdef SYSCLK_FREQ_8MHz_HSI
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SetSysClockTo8_HSI();
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#elif defined SYSCLK_FREQ_12MHz_HSI
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SetSysClockTo12_HSI();
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#elif defined SYSCLK_FREQ_16MHz_HSI
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SetSysClockTo16_HSI();
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#elif defined SYSCLK_FREQ_24MHz_HSI
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SetSysClockTo24_HSI();
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#elif defined SYSCLK_FREQ_48MHz_HSI
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SetSysClockTo48_HSI();
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#endif
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}
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#ifdef SYSCLK_FREQ_8MHz_HSI
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/*********************************************************************
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* @fn SetSysClockTo8_HSI
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*
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* @brief Sets HSE as System clock source and configure HCLK prescalers.
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*
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* @return none
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*/
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static void SetSysClockTo8_HSI(void)
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{
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/* Flash 2 wait state */
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FLASH->ACTLR &= (uint32_t)((uint32_t)~FLASH_ACTLR_LATENCY);
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FLASH->ACTLR |= (uint32_t)FLASH_ACTLR_LATENCY_2;
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/* HCLK = SYSCLK = APB1 */
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RCC->CFGR0 &= (uint32_t)0xFFFFFF0F;
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RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV6;
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/* Flash 0 wait state */
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FLASH->ACTLR &= (uint32_t)((uint32_t)~FLASH_ACTLR_LATENCY);
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FLASH->ACTLR |= (uint32_t)FLASH_ACTLR_LATENCY_0;
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}
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#elif defined SYSCLK_FREQ_12MHz_HSI
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/*********************************************************************
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* @fn SetSysClockTo12_HSI
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*
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* @brief Sets System clock frequency to 12MHz and configure HCLK prescalers.
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*
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* @return none
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*/
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static void SetSysClockTo12_HSI(void)
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{
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/* Flash 2 wait state */
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FLASH->ACTLR &= (uint32_t)((uint32_t)~FLASH_ACTLR_LATENCY);
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FLASH->ACTLR |= (uint32_t)FLASH_ACTLR_LATENCY_2;
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/* HCLK = SYSCLK = APB1 */
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RCC->CFGR0 &= (uint32_t)0xFFFFFF0F;
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RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV4;
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/* Flash 0 wait state */
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FLASH->ACTLR &= (uint32_t)((uint32_t)~FLASH_ACTLR_LATENCY);
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FLASH->ACTLR |= (uint32_t)FLASH_ACTLR_LATENCY_0;
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}
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#elif defined SYSCLK_FREQ_16MHz_HSI
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/*********************************************************************
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* @fn SetSysClockTo16_HSI
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*
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* @brief Sets System clock frequency to 16MHz and configure HCLK prescalers.
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*
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* @return none
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*/
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static void SetSysClockTo16_HSI(void)
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{
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/* Flash 2 wait state */
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FLASH->ACTLR &= (uint32_t)((uint32_t)~FLASH_ACTLR_LATENCY);
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FLASH->ACTLR |= (uint32_t)FLASH_ACTLR_LATENCY_2;
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/* HCLK = SYSCLK = APB1 */
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RCC->CFGR0 &= (uint32_t)0xFFFFFF0F;
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RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV3;
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/* Flash 0 wait state */
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FLASH->ACTLR &= (uint32_t)((uint32_t)~FLASH_ACTLR_LATENCY);
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FLASH->ACTLR |= (uint32_t)FLASH_ACTLR_LATENCY_1;
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}
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#elif defined SYSCLK_FREQ_24MHz_HSI
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/*********************************************************************
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* @fn SetSysClockTo24_HSI
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*
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* @brief Sets System clock frequency to 24MHz and configure HCLK prescalers.
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*
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* @return none
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*/
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static void SetSysClockTo24_HSI(void)
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{
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/* Flash 2 wait state */
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FLASH->ACTLR &= (uint32_t)((uint32_t)~FLASH_ACTLR_LATENCY);
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FLASH->ACTLR |= (uint32_t)FLASH_ACTLR_LATENCY_2;
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/* HCLK = SYSCLK = APB1 */
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RCC->CFGR0 &= (uint32_t)0xFFFFFF0F;
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RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV2;
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/* Flash 1 wait state */
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FLASH->ACTLR = (uint32_t)FLASH_ACTLR_LATENCY_1;
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}
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#elif defined SYSCLK_FREQ_48MHz_HSI
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/*********************************************************************
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* @fn SetSysClockTo48_HSI
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*
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* @brief Sets System clock frequency to 48MHz and configure HCLK prescalers.
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*
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* @return none
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*/
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static void SetSysClockTo48_HSI(void)
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{
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/* Flash 2 wait state */
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FLASH->ACTLR &= (uint32_t)((uint32_t)~FLASH_ACTLR_LATENCY);
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FLASH->ACTLR |= (uint32_t)FLASH_ACTLR_LATENCY_2;
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/* HCLK = SYSCLK = APB1 */
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RCC->CFGR0 &= (uint32_t)0xFFFFFF0F;
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RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV1;
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}
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#endif
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