278 lines
8.3 KiB
C
278 lines
8.3 KiB
C
/**
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******************************************************************************
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* @file sys.c
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* @author AE Team
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* @version V1.3.9
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* @date 28/08/2019
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* @brief This file provides all the sys firmware functions.
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******************************************************************************
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* @copy
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*
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* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
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* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
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* TIME. AS A RESULT, MindMotion SHALL NOT BE HELD LIABLE FOR ANY
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* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
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* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
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* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
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*
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* <h2><center>© COPYRIGHT 2019 MindMotion</center></h2>
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*/
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#include "sys.h"
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extern u32 SystemCoreClock;
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//设置向量表偏移地址
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//NVIC_VectTab:基址
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//Offset:偏移量
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void MY_NVIC_SetVectorTable(u32 NVIC_VectTab, u32 Offset)
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{
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SCB->VTOR = NVIC_VectTab | (Offset & (u32)0x1FFFFF80); //设置NVIC的向量表偏移寄存器
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//用于标识向量表是在CODE区还是在RAM区
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}
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//设置NVIC分组
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//NVIC_Group:NVIC分组 0~4 总共5组
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void MY_NVIC_PriorityGroupConfig(u8 NVIC_Group)
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{
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u32 temp, temp1;
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temp1 = (~NVIC_Group) & 0x07; //取后三位
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temp1 <<= 8;
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temp = SCB->AIRCR; //读取先前的设置
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temp &= 0X0000F8FF; //清空先前分组
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temp |= 0X05FA0000; //写入钥匙
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temp |= temp1;
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SCB->AIRCR = temp; //设置分组
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}
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//设置NVIC
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//NVIC_PreemptionPriority:抢占优先级
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//NVIC_SubPriority :响应优先级
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//NVIC_Channel :中断编号
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//NVIC_Group :中断分组 0~4
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//注意优先级不能超过设定的组的范围!否则会有意想不到的错误
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//组划分:
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//组0:0位抢占优先级,4位响应优先级
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//组1:1位抢占优先级,3位响应优先级
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//组2:2位抢占优先级,2位响应优先级
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//组3:3位抢占优先级,1位响应优先级
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//组4:4位抢占优先级,0位响应优先级
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//NVIC_SubPriority和NVIC_PreemptionPriority的原则是,数值越小,越优先
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void MY_NVIC_Init(u8 NVIC_PreemptionPriority, u8 NVIC_SubPriority, u8 NVIC_Channel, u8 NVIC_Group)
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{
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u32 temp;
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MY_NVIC_PriorityGroupConfig(NVIC_Group);//设置分组
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temp = NVIC_PreemptionPriority << (4 - NVIC_Group);
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temp |= NVIC_SubPriority & (0x0f >> NVIC_Group);
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temp &= 0xf; //取低四位
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NVIC->ISER[NVIC_Channel / 32] |= (1 << NVIC_Channel % 32); //使能中断位(要清除的话,相反操作就OK)
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NVIC->IP[NVIC_Channel] |= temp << 4; //设置响应优先级和抢断优先级
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}
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//外部中断配置函数
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//只针对GPIOA~G;不包括PVD,RTC和USB唤醒这三个
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//参数:
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//GPIOx:0~6,代表GPIOA~G
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//BITx:需要使能的位;
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//TRIM:触发模式,1,下升沿;2,上降沿;3，任意电平触发
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//该函数一次只能配置1个IO口,多个IO口,需多次调用
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//该函数会自动开启对应中断,以及屏蔽线
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void Ex_NVIC_Config(u8 GPIOx, u8 BITx, u8 TRIM)
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{
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u8 EXTADDR;
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u8 EXTOFFSET;
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EXTADDR = BITx / 4; //得到中断寄存器组的编号
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EXTOFFSET = (BITx % 4) * 4;
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RCC->APB2ENR |= 0x01; //使能io复用时钟
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AFIO->EXTICR[EXTADDR] &= ~(0x000F << EXTOFFSET); //清除原来设置！！！
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AFIO->EXTICR[EXTADDR] |= GPIOx << EXTOFFSET; //EXTI.BITx映射到GPIOx.BITx
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//自动设置
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EXTI->IMR |= 1 << BITx; // 开启line BITx上的中断
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//EXTI->EMR|=1<<BITx;//不屏蔽line BITx上的事件 (如果不屏蔽这句,在硬件上是可以的,但是在软件仿真的时候无法进入中断!)
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if(TRIM & 0x01)EXTI->FTSR |= 1 << BITx; //line BITx上事件下降沿触发
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if(TRIM & 0x02)EXTI->RTSR |= 1 << BITx; //line BITx上事件上升降沿触发
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}
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//不能在这里执行所有外设复位!否则至少引起串口不工作.
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//把所有时钟寄存器复位
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void MYRCC_DeInit(void)
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{
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RCC->APB1RSTR = 0x00000000;//复位结束
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RCC->APB2RSTR = 0x00000000;
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RCC->AHBENR = 0x00000014; //睡眠模式闪存和SRAM时钟使能.其他关闭.
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RCC->APB2ENR = 0x00000000; //外设时钟关闭.
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RCC->APB1ENR = 0x00000000;
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RCC->CR |= 0x00000001; //使能内部高速时钟HSION
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RCC->CFGR &= 0xF8FF0000; //复位SW[1:0],HPRE[3:0],PPRE1[2:0],PPRE2[2:0],ADCPRE[1:0],MCO[2:0]
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RCC->CR &= 0xFEF6FFFF; //复位HSEON,CSSON,PLLON
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RCC->CR &= 0xFFFBFFFF; //复位HSEBYP
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RCC->CFGR &= 0xFF80FFFF; //复位PLLSRC, PLLXTPRE, PLLMUL[3:0] and USBPRE
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RCC->CIR = 0x00000000; //关闭所有中断
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//配置向量表
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#ifdef VECT_TAB_RAM
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MY_NVIC_SetVectorTable(0x20000000, 0x0);
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#else
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MY_NVIC_SetVectorTable(0x08000000, 0x0);
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#endif
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}
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//THUMB指令不支持汇编内联
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//采用如下方法实现执行汇编指令WFI
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void WFI_SET(void)
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{
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__ASM volatile("wfi");
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}
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//关闭所有中断
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void INTX_DISABLE(void)
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{
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__ASM volatile("cpsid i");
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}
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//开启所有中断
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void INTX_ENABLE(void)
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{
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__ASM volatile("cpsie i");
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}
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//进入待机模式
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void Sys_Standby(void)
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{
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SCB->SCR |= SCB_SCR_SLEEPDEEP; //使能SLEEPDEEP位 (SYS->CTRL)
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RCC->APB1ENR |= RCC_APB1RSTR_PWRRST; //使能电源时钟
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PWR->CSR |= PWR_CSR_EWUP; //设置WKUP用于唤醒
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PWR->CR |= PWR_CR_CWUF; //清除Wake-up 标志
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PWR->CR |= PWR_CR_PDDS; //PDDS置位
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WFI_SET(); //执行WFI指令
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}
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//系统软复位
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void Sys_Soft_Reset(void)
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{
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SCB->AIRCR = 0X05FA0000 | (u32)0x04;
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}
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//JTAG模式设置,用于设置JTAG的模式
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//mode:jtag,swd模式设置;00,全使能;01,使能SWD;10,全关闭;
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//#define JTAG_SWD_DISABLE 0X02
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//#define SWD_ENABLE 0X01
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//#define JTAG_SWD_ENABLE 0X00
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void JTAG_Set(u8 mode)
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{
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u32 temp;
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temp = mode;
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temp <<= 25;
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RCC->APB2ENR |= RCC_APB2RSTR_AFIORST; //开启辅助时钟
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AFIO->MAPR &= 0XF8FFFFFF; //清除MAPR的[26:24]
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AFIO->MAPR |= temp; //设置jtag模式
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}
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//系统时钟初始化函数
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//pll:选择的倍频数，从2开始，最大值为16
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void System_Clock_Init(u8 PLL)
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{
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unsigned char temp = 0;
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MYRCC_DeInit(); //复位并配置向量表
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RCC->CR |= RCC_CR_HSEON; //外部高速时钟使能HSEON
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while(!(RCC->CR & RCC_CR_HSERDY)); //等待外部时钟就绪
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RCC->CFGR = RCC_CFGR_PPRE1_2; //APB1=DIV2;APB2=DIV1;AHB=DIV1;
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RCC->CFGR |= RCC_CFGR_PLLSRC; //PLLSRC ON
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RCC->CR &= ~(RCC_CR_PLLON); //清PLL// RCC->CR &=~(7<<20); //清PLL
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RCC->CR &= ~(0x1f << 26);
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RCC->CR |= (PLL - 1) << 26; //设置PLL值 2~16
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FLASH->ACR |= FLASH_ACR_LATENCY_1 | FLASH_ACR_PRFTBE | FLASH_ACR_PRFTBS; //FLASH 2个延时周期
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RCC->CR |= RCC_CR_PLLON; //PLLON
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while(!(RCC->CR & RCC_CR_PLLRDY)); //等待PLL锁定
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RCC->CFGR |= RCC_CFGR_SW_PLL; //PLL作为系统时钟
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while(temp != 0x02) //等待PLL作为系统时钟设置成功
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{
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temp = RCC->CFGR >> 2;
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temp &= 0x03;
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}
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}
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/*
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HSE 外部时钟 8M
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*/
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#if 0
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void RCC_MCOConfig(uint8_t RCC_MCO)
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{
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/* Check the parameters */
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assert_param(IS_RCC_MCO(RCC_MCO));
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/* Perform Byte access to MCO[2:0] bits to select the MCO source */
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*(__IO uint8_t *) CFGR_BYTE4_ADDRESS = RCC_MCO;
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}
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#endif
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void SystemClk_Output(void)
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{
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// GPIO_InitTypeDef GPIO_InitStructure;
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// RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
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// GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //mco pa8
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// GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; // 推免复用输出
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// GPIO_Init(GPIOA, &GPIO_InitStructure);
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RCC->APB2ENR |= RCC_APB2ENR_IOPAEN; //使能PORTA时钟
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GPIOA->CRH &= 0XFFFFFFF0;
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GPIOA->CRH |= GPIO_CRH_MODE8; //PA8 推挽输出
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GPIOA->ODR |= GPIO_ODR_ODR8; //PA8 输出高
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//------------------------------------------------------------
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//add start
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/*
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#define RCC_CFGR_MCO_2 ((uint32_t)0x04000000)
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位26:24
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MCO： 微控制器时钟输出
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由软件置’1’或清零。
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00x：没有时钟输出；
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010：LSI 时钟输出；
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011：LSE 时钟输出；
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100：系统时钟(SYSCLK)输出；
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101：HSI 时钟输出；
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110：HSE 时钟输出；
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111：PLL 时钟2分频后输出。
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注意：
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- 该时钟输出在启动和切换MCO时钟源时可能会被截断。
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- 在系统时钟作为输出至MCO管脚时，请保证输出时钟频率不超过50MHz (IO口最高频率)
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*/
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// RCC->CR &= (uint32_t)~RCC_CFGR_MCO; //CLEAR pll PARAMETERS
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//-------------------------------------------------
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// RCC->CFGR |= (uint32_t)RCC_CFGR_MCO_PLL ;//PLL/2
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if(SystemCoreClock < 8000000)
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{
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//RCC_MCOConfig(RCC_MCO_HSE); //通过PA8 pin 观察频率
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RCC->CFGR |= (uint32_t)RCC_CFGR_MCO_HSE ;//PLL/2
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}
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else if(SystemCoreClock <= 48000000)
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{
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//RCC_MCOConfig(RCC_MCO_SYSCLK); //通过PA8 pin 观察频率 SYSCLK<48M
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RCC->CFGR |= (uint32_t)RCC_CFGR_MCO_SYSCLK ;//PLL/2
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}
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else
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{
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//RCC_MCOConfig(RCC_MCO_PLLCLK_Div2); //通过PA8 pin 观察频率
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RCC->CFGR |= (uint32_t)RCC_CFGR_MCO_PLL ;//PLL/2
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}
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}
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/**
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* @}
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*/
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/**
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* @}
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*/
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/**
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* @}
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*/
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/*-------------------------(C) COPYRIGHT 2019 MindMotion ----------------------*/
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