104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/*
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*Copyright (C),2023 , NANOCHAP
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*File name: ENS1_CLOCK.C
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*Author:
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*Version: V1.0
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*Date: 2023-11-
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*Description:
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*Function List:
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History:
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1.V1.0
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Date:
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Author:
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Modification: 初版
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*/
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#include "ENS1_CLOCK.h"
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uint32_t APB_Clock_Freq =0;
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//设置后的时钟频率请查看时钟树计算
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Clock_ConfigStructure CLOCKCFG=
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{
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.MCO_SEL = MCO_HSI ,
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.HSI_FREQ = HSI_32MHZ ,
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.HSE_OSC_FREQ = 0,
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.LSE_OSC_FREQ = 0,
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.SYSCLK_SEL = HSI_SYSCLK ,
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.ENS1_APB_PCLK_DIV_x = ENS1_APB_PCLK_DIV_1,
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.ENS1_AHB_PCLK_DIV_x = ENS1_AHB_HCLK_DIV_1,
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.LFCLK_SW_SEL = LSI_AS_LFCLK ,
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};
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uint32_t ClockInitSet(Clock_ConfigStructure* CLOCKCONFIG)
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{
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uint32_t clockfreq = 0;
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//配置系统各时钟初始化
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//1 确定输入频率
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CMSDK_SYSCON->CLK_CFG |= (CLOCKCONFIG->MCO_SEL<<16);
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if(CLOCKCONFIG->MCO_SEL == MCO_HSI)
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{
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CMSDK_SYSCON->HSI_CTRL |= (CLOCKCONFIG->HSI_FREQ << 4);
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clockfreq = (uint8_t)pow(2,CLOCKCONFIG->HSI_FREQ+2)*1000000;
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}
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else if(CLOCKCONFIG->MCO_SEL == MCO_HSE)
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{
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clockfreq = CLOCKCONFIG->HSE_OSC_FREQ * 1000000;
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}
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else if(CLOCKCONFIG->MCO_SEL == MCO_LSI)
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{
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clockfreq = 32768 ;
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}
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else if(CLOCKCONFIG->MCO_SEL == MCO_LSE)
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{
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clockfreq = CLOCKCONFIG->LSE_OSC_FREQ ;
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}
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else
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{
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CMSDK_SYSCON->HSI_CTRL |= (CLOCKCONFIG->HSI_FREQ << 4);
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clockfreq = (uint8_t)pow(2,CLOCKCONFIG->HSI_FREQ+2);
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}
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//2 选择系统的时钟源
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CMSDK_SYSCON->CLK_CFG |= (CLOCKCONFIG->SYSCLK_SEL);
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while((CMSDK_SYSCON->CLK_CFG >> 2 ) & 0x1);
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//3 基于系统时钟源的频率设置分频系数
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CMSDK_SYSCON->CLK_CFG |= (CLOCKCONFIG->ENS1_AHB_PCLK_DIV_x << 8);
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CMSDK_SYSCON->CLK_CFG |= (CLOCKCONFIG->ENS1_APB_PCLK_DIV_x << 12);
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if(CLOCKCONFIG->ENS1_AHB_PCLK_DIV_x > 0)
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clockfreq = (uint32_t)(clockfreq / pow(2,CLOCKCONFIG->ENS1_AHB_PCLK_DIV_x-3));
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if(CLOCKCONFIG->ENS1_APB_PCLK_DIV_x > 0)
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clockfreq = (uint32_t)(clockfreq / pow(2,CLOCKCONFIG->ENS1_APB_PCLK_DIV_x-3));
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return clockfreq; //返回时钟频率（分频后的APB上的时钟频率）
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}
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void ClockInit(void)
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{
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APB_Clock_Freq = ClockInitSet(&CLOCKCFG);
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CMSDK_SYSCON->APB_CLKEN = 0;
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}
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//PCLK时钟使能
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uint8_t PCLK_Enable(uint8_t APB_CLKEN_POS)
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{
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CMSDK_SYSCON->APB_CLKEN |= (0x1 << APB_CLKEN_POS);
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return 0;
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}
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//PCLK时钟关闭
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uint8_t PCLK_Disable(uint8_t APB_CLKEN_POS)
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{
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CMSDK_SYSCON->APB_CLKEN &=~ (0x1 << APB_CLKEN_POS);
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return 0;
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}
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//配置外部晶振，配置前请保留足够延时，否则无法二次烧录程序
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void HSE_ClockInit(uint32_t Clock_Freq)
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{
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CMSDK_GPIO->IE = (CMSDK_GPIO->IE & ~(0x01ul << 0)) | (0x01 << 0);
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CMSDK_GPIO->ALTFL = (CMSDK_GPIO->ALTFL & ~(0x03ul << 0)) | (0x02 << 0);
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CMSDK_SYSCON->CLK_CFG = (CMSDK_SYSCON->CLK_CFG & ~CMSDK_SYSCON_SYSCLK_SEL_Msk) | (0x1 << CMSDK_SYSCON_SYSCLK_SEL_Pos);
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while (((CMSDK_SYSCON->CLK_CFG & CMSDK_SYSCON_SYSCLK_SWSTS_Msk) >> CMSDK_SYSCON_SYSCLK_SWSTS_Pos) != 0x01) { }
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CMSDK_SYSCON->HSI_CTRL = (CMSDK_SYSCON->HSI_CTRL & ~CMSDK_SYSCON_HSI_EN_Msk);
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APB_Clock_Freq = Clock_Freq;//外部时钟频率
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}
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