77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
/***************************************************************
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*Copyright (C), 2017, Shanghai Eastsoft Microelectronics Co., Ltd
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*文件名： system_ES8P508x.c
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*作 者： Liut
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*版 本： V1.00
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*日 期： 2017/07/14
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*描 述： 库函数配置文件
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*备 注： 适用于 ES8P508x芯片
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本软件仅供学习和演示使用，对用户直接引用代码所带来的风险或后果不承担任何法律责任。
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***************************************************************/
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#include "system_ES8P508x.h"
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#include "lib_config.h"
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uint32_t SystemCoreClock = 48000000;
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/***************************************************************
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函数名：SystemCoreClockUpdate
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描 述：系统时钟配置为内部时钟20MHZ，同时设置SystemCoreClock
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输入值：无
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输出值：无
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返回值：无
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***************************************************************/
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void SystemCoreClockUpdate (void)
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{
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uint32_t Prot_Temp;
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uint16_t Count=0;
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SystemClockSelect(SCU_SysClk_HRC , CLK_SEL_HRC); //选择系统时钟为HRC时钟
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PLLClock_Config(DISABLE, SCU_PLL_HRC, SCU_PLL_48M,ENABLE); //PLL禁止
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Prot_Temp = SCU->PROT.PROT;
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if(Prot_Temp != 0) //写保护了
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{SCU->PROT.Word = 0x55AA6996;} //解锁
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SCU->SCLKEN1.HRC_EN = 1; //使能内部20MHZ
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do
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{
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Count++;
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}
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while((SCU->SCLKEN1.HRC_RDY == 0)&&(Count != 0xFFF)); //等待时钟开启
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if(Count == 0xFFF)
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{
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return ;
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}
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SCU->SCLKEN0.SYSCLK_DIV = 0; //系统时钟后分频1:1
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switch(SCU->SCLKEN0.CLK_SEL)
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{
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case 0:
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SystemCoreClock = 20000000; //HRC
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break;
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case 1:
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SystemCoreClock = 32000; //LRC
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break;
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default:
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break;
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}
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if(Prot_Temp != 0) //写保护了
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{SCU->PROT.Word = 0x00000000;} //打开写保护
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}
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/***************************************************************
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函数名：SystemInit
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描 述：系统初始化，设置时钟
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输入值：无
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输出值：无
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返回值：无
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***************************************************************/
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void SystemInit (void)
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{
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SystemCoreClockUpdate();
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}
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/*************************END OF FILE**********************/
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