315 lines
9.8 KiB
C++
315 lines
9.8 KiB
C++
#include "Sys.h"
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TSys Sys;
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#ifndef BIT
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#define BIT(x) (1 << (x))
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#endif
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#define RCC_CFGR_USBPRE_Div1 ((uint32_t)0x00400000) /*!< USB Device prescaler */
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#define RCC_CFGR_USBPRE_1Div5 ((uint32_t)0x00000000) /*!< USB Device prescaler */
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#define RCC_CFGR_USBPRE_Div2 ((uint32_t)0x00C00000) /*!< USB Device prescaler */
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#define RCC_CFGR_USBPRE_2Div5 ((uint32_t)0x00800000) /*!< USB Device prescaler */
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#define GD32_PLL_MASK 0x20000000
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byte fac_us;//全局变量
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volatile uint TickStat;//全局变量 为延时函数服务
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/****************************************************
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函数功能：延时初始化
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输入参数：SYSCLK : 系统时钟
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输出参数：无
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备 注：无
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*****************************************************/
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void delay_init(uint clk)
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{
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NVIC_InitTypeDef NVIC_InitStructure;
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/****************************************
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*SystemFrequency/1000 1ms中断一次 *
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*SystemFrequency/100000 10us中断一次 *
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*SystemFrequency/1000000 1us中断一次 *
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*****************************************/
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SysTick->CTRL &=~BIT(2);//选择外部时钟
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SysTick->CTRL |=BIT(1);//开启定时器减到0后的中断请求
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fac_us = clk/8;//计算好SysTick加载值
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/*初始化部分代码*/
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SysTick->LOAD = (uint)fac_us*1000-1;//加载时间值
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SysTick->VAL = 1;//随便写个值，清除加载寄存器的值
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SysTick->CTRL |= BIT(0);//SysTick使能
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/* Configure the NVIC Preemption Priority Bits */
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NVIC_InitStructure.NVIC_IRQChannel = (byte)SysTick_IRQn;
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#ifdef STM32F10X
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
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#else
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NVIC_InitStructure.NVIC_IRQChannelPriority = 0x00; //想在中断里使用延时函数就必须让此中断优先级最高
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#endif
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStructure);
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}
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__asm void TSys::DisableInterrupts()
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{
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/*
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register UINT32 Primask __asm("primask");
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UINT32 m = Primask;
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__disable_irq();
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return m ^ 1;
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*/
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#ifdef STM32F10X //stm32f030的汇编与此有所区别
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MRS r0,PRIMASK
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CPSID i
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EOR r0,r0,#1
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BX lr
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#else
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BX lr
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#endif
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}
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__asm void TSys::EnableInterrupts()
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{
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/*
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register UINT32 Primask __asm("primask");
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UINT32 m = Primask;
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__enable_irq();
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return m ^ 1;
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*/
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// 这里打开中断以后，经常发生各种各样的异常，没有关系，并不是这里的错，而是之前可能就已经发生了异常，只不过无法产生中断，等到这里而已
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#ifdef STM32F10X //stm32f030的汇编与此有所区别
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MRS r0,PRIMASK
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CPSIE i
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EOR r0,r0,#1
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BX lr
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#else
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BX lr
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#endif
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}
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//利用SysTick定时器产生1ms时基
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// SysTick_Handler 滴答定时器中断
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void SysTick_Handler(void) //需要最高优先级 必须有抢断任何其他中断的能力才能 //供其他中断内延时使用
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{
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if(TickStat)
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TickStat--;
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}
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/****************************************************
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函数功能：ms级延时
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输入参数：nms : 毫秒
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输出参数：无
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备 注：调用此函数前，需要初始化Delay_Init()函数
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*****************************************************/
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void TSys::Sleep(uint ms)
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{
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TickStat = ms;
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while(TickStat);
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}
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/****************************************************
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函数功能：us级延时
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输入参数：nus : 微秒
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输出参数：无
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备 注：调用此函数前，需要初始化Delay_Init()函数
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*****************************************************/
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void TSys::Delay(uint us)
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{
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uint t = SysTick->CTRL&0x00ffffff; //SysTick 为24位倒计数定时器
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uint tc = fac_us * us;
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//if(nus<100){for();retrun} //低于100微秒的延时就没有必要使用定时器作为时基了
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if(us > 1000) //如果延迟超过1ms
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{
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Sleep(us / 1000);
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// if(tc%1000==0)return; //几率比较小 忽略此句、
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tc=(tc%1000)*fac_us;
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}
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if((t-tc)>0)
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{
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while(SysTick->CTRL>(t-tc));
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return;
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}
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else if((t-tc)==0)
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{
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while(SysTick->CTRL);
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return;
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}
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else
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{
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tc= SysTick->LOAD -(tc-t); //低于1s 所以
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while(SysTick->CTRL!=tc);
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return;
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}
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}
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#if GD32F1
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// 获取JTAG编号，ST是0x041，GD是0x7A3
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uint16_t Get_JTAG_ID()
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{
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if( *( uint8_t *)( 0xE00FFFE8 ) & 0x08 )
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{
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return ((*(uint8_t *)(0xE00FFFD0) & 0x0F ) << 8 ) |
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((*(uint8_t *)(0xE00FFFE4) & 0xFF ) >> 3 ) |
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((*(uint8_t *)(0xE00FFFE8) & 0x07 ) << 5 ) + 1 ;
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}
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return 0;
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}
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void STM32_BootstrapCode()
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{
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uint n = 0;
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uint RCC_CFGR_ADC_BITS = RCC_CFGR_ADCPRE_DIV8;
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uint FLASH_ACR_LATENCY_BITS = 0;
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uint RCC_CFGR_USBPRE_BIT = 0;
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uint mull, mull2;
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// 是否GD
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bool isGD = Get_JTAG_ID() == 0x7A3;
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if(isGD && Sys.Clock == 72000000) Sys.Clock = 120000000;
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// 确保关闭中断，为了方便调试，Debug时不关闭
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#ifndef DEBUG
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//__disable_irq();
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#endif
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n = Sys.Clock / 14000000;
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if (n < 6)
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RCC_CFGR_ADC_BITS = RCC_CFGR_ADCPRE_DIV6;
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else
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RCC_CFGR_ADC_BITS = RCC_CFGR_ADCPRE_DIV8;
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// GD32的Flash零等待
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if (isGD)
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FLASH_ACR_LATENCY_BITS = FLASH_ACR_LATENCY_0; // 不允许等待
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else
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FLASH_ACR_LATENCY_BITS = FLASH_ACR_LATENCY_2; // 等待两个
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// 配置JTAG调试支持
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DBGMCU->CR = DBGMCU_CR_DBG_TIM2_STOP | DBGMCU_CR_DBG_SLEEP;
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// 允许访问未对齐内存，不强制8字节栈对齐
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SCB->CCR &= ~(SCB_CCR_UNALIGN_TRP | SCB_CCR_STKALIGN);
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// 捕获所有异常
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CoreDebug->DEMCR |= CoreDebug_DEMCR_VC_HARDERR_Msk | CoreDebug_DEMCR_VC_INTERR_Msk |
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CoreDebug_DEMCR_VC_BUSERR_Msk | CoreDebug_DEMCR_VC_STATERR_Msk |
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CoreDebug_DEMCR_VC_CHKERR_Msk | CoreDebug_DEMCR_VC_NOCPERR_Msk |
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CoreDebug_DEMCR_VC_MMERR_Msk;
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// 为了配置时钟，CPU必须运行在8MHz晶振上
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RCC->CR |= RCC_CR_HSION;
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while(!(RCC->CR & RCC_CR_HSIRDY));
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// 切换到内部时钟
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RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));
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// RCC_CFGR_SW_HSI是0，一点意义都没有
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RCC->CFGR |= RCC_CFGR_SW_HSI; // sysclk = AHB = APB1 = APB2 = HSI (8MHz)
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// 关闭 HSE 时钟
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RCC->CR &= ~RCC_CR_HSEON;
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// 关闭 HSE & PLL
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RCC->CR &= ~RCC_CR_PLLON;
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RCC->CR |= ((uint32_t)RCC_CR_HSEON);
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while(!(RCC->CR & RCC_CR_HSERDY));
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// 设置Flash访问时间，并打开预读缓冲
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FLASH->ACR = FLASH_ACR_LATENCY_BITS | FLASH_ACR_PRFTBE;
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RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMULL));
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// 支持超频，主频必须是8M的倍频
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mull = Sys.Clock / Sys.CystalClock;
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mull2 = (mull - 2) << 18;
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// 处理0.5倍频
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if( (mull * Sys.CystalClock + Sys.CystalClock / 2) == Sys.Clock )
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{
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mull = 2 * Sys.Clock / Sys.CystalClock;
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// 对于GD32的108MHz，没有除尽。
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if( isGD && mull > 17 )
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mull2 = (mull - 17) << 18 | RCC_CFGR_PLLXTPRE_HSE_Div2 | GD32_PLL_MASK;
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else
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mull2 = (mull - 2 ) << 18 | RCC_CFGR_PLLXTPRE_HSE_Div2;
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}
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RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC_HSE | mull2);
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switch ( 2 * Sys.Clock / 48000000 )
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{
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case 2:
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RCC_CFGR_USBPRE_BIT = RCC_CFGR_USBPRE_Div1;
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break;
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case 3:
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RCC_CFGR_USBPRE_BIT = RCC_CFGR_USBPRE_1Div5;
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break;
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case 4:
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RCC_CFGR_USBPRE_BIT = RCC_CFGR_USBPRE_Div2;
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break;
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case 5:
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RCC_CFGR_USBPRE_BIT = RCC_CFGR_USBPRE_2Div5;
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break;
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default:
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RCC_CFGR_USBPRE_BIT = RCC_CFGR_USBPRE_Div1;
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break;
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}
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// 最终时钟配置
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RCC->CFGR |= RCC_CFGR_USBPRE_BIT // USB clock
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| RCC_CFGR_HPRE_DIV1 // AHB clock
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| RCC_CFGR_PPRE1_DIV2 // APB1 clock
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| RCC_CFGR_PPRE2_DIV1 // APB2 clock
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| RCC_CFGR_ADC_BITS; // ADC clock (max 14MHz)
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// 打开 HSE & PLL
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RCC->CR |= RCC_CR_PLLON;// | RCC_CR_HSEON;
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// 等到 PPL 达到时钟频率
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while(!(RCC->CR & RCC_CR_PLLRDY));
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// 最终时钟配置
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RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));
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RCC->CFGR |= RCC_CFGR_SW_PLL; // sysclk = pll out (SYSTEM_CLOCK_HZ)
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while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x08);
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// 最小化外设时钟
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RCC->AHBENR = RCC_AHBENR_SRAMEN | RCC_AHBENR_FLITFEN;
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RCC->APB2ENR = RCC_APB2ENR_AFIOEN;
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RCC->APB1ENR = RCC_APB1ENR_PWREN;
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// 关闭 HSI 时钟
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RCC->CR &= ~RCC_CR_HSION;
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// 计算当前工作频率
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mull = RCC->CFGR & ((int)0x3C0000 | GD32_PLL_MASK);
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if((mull & GD32_PLL_MASK) != 0) // 兼容GD32的108MHz
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mull = (((mull)&(0x003C0000)) >> 18) + 17;
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else
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mull = ( mull >> 18) + 2;
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//TSys::Frequency = HSI_VALUE * pllmull;
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// 不能直接用HSI_VALUE，因为不同的硬件设备使用不同的晶振
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Sys.Clock = Sys.CystalClock * mull;
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if( (RCC->CFGR & RCC_CFGR_PLLXTPRE_HSE_Div2) && !isGD ) Sys.Clock /= 2;
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}
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#endif
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void TSys::Init(void)
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{
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#ifndef GD32F1
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RCC_ClocksTypeDef clock;
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RCC_GetClocksFreq(&clock);
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Clock = clock.SYSCLK_Frequency;
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#endif
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#ifdef STM32F10X
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NVIC_PriorityGroupConfig( NVIC_PriorityGroup_4); //中断优先级分配方案4 四位都是抢占优先级
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#endif
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ID[0] = *(__IO uint *)(0X1FFFF7F0); // 高字节
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ID[1] = *(__IO uint *)(0X1FFFF7EC); //
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ID[2] = *(__IO uint *)(0X1FFFF7E8); // 低字节
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FlashSize = *(__IO ushort *)(0X1FFFF7E0); // 容量
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#if GD32F1
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STM32_BootstrapCode();
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#endif
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delay_init(Clock/1000000);
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}
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