290 lines
7.3 KiB
C++
290 lines
7.3 KiB
C++
#include "RTC.h"
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#include "TTime.h"
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#include "Platform\stm32.h"
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//#define TIME_DEBUG DEBUG
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/************************************************ HardRTC ************************************************/
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bool RTC_WaitForLastTask2(uint retry = 300)
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{
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while(RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET && --retry);
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return retry > 0;
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}
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void RTC_Configuration(bool init, bool ext)
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{
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/* 备份寄存器模块复位，将BKP的全部寄存器重设为缺省值 */
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if(init) BKP_DeInit();
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if(!ext)
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{
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/* Enable LSI */
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RCC_LSICmd(ENABLE);
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/* 等待稳定 */
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while(RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET);
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// 使用内部 32 KHz 晶振作为 RTC 时钟源
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RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);
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}
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else
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{
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/* 设置外部低速晶振(LSE)32.768K 参数指定LSE的状态，可以是：RCC_LSE_ON：LSE晶振ON */
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RCC_LSEConfig(RCC_LSE_ON);
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/* 等待稳定 */
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while(RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET);
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// RTC时钟源配置成LSE（外部32.768K）
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RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
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}
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/* 使能RTC时钟 */
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RCC_RTCCLKCmd(ENABLE);
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/* 开启后需要等待APB1时钟与RTC时钟同步，才能读写寄存器 */
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RTC_WaitForSynchro();
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/* 每一次读写寄存器前，要确定上一个操作已经结束 */
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RTC_WaitForLastTask2();
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/* 使能秒中断 */
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//RTC_ITConfig(RTC_IT_SEC, ENABLE);
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/* 每一次读写寄存器前，要确定上一个操作已经结束 */
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//RTC_WaitForLastTask2();
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if(init)
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{
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/* 设置RTC分频器，使RTC时钟为1Hz */
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//if(!ext)
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//RTC_SetPrescaler(31999); /* RTC period = RTCCLK/RTC_PR = (32.000 KHz)/(31999+1) */
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//else
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//RTC_SetPrescaler(32767); /* RTC period = RTCCLK/RTC_PR = (32.768 KHz)/(32767+1) */
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// 为了使用低功耗，时钟为1kHz
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// 1ms计数，32位定时器，最大计时约49天
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RTC_SetPrescaler(32);
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/* 每一次读写寄存器前，要确定上一个操作已经结束 */
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RTC_WaitForLastTask2();
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}
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}
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static uint g_NextSave; // 下一次保存Ticks的时间，避免频繁保存
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void AlarmHandler(ushort num, void* param);
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void HardRTC::Init()
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{
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/*****************************/
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/* GD32和STM32最大的区别就是STM32给寄存器默认值，而GD32没有给默认值 */
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/* 虽然RTC靠电池工作，断电后能保持配置，但是在GD32还是得重新打开时钟 */
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/* 启用PWR和BKP的时钟 */
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);
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/* 后备域解锁 */
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PWR_BackupAccessCmd(ENABLE);
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// 下一次保存Ticks的数值，避免频繁保存
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g_NextSave = 0;
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Opened = true;
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if(ReadBackup(0) != 0xABCD)
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{
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RTC_Configuration(true, External);
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WriteBackup(0, 0xABCD);
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}
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else
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{
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//虽然RTC模块不需要重新配置，且掉电后依靠后备电池依然运行
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//但是每次上电后，还是要使能RTCCLK
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RTC_Configuration(false, External);
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// 从RTC还原滴答
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LoadTime();
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}
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if(LowPower)
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{
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EXTI_ClearITPendingBit(EXTI_Line17);
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EXTI_InitTypeDef exit;
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exit.EXTI_Line = EXTI_Line17;
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exit.EXTI_Mode = EXTI_Mode_Interrupt;
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exit.EXTI_Trigger = EXTI_Trigger_Rising;
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exit.EXTI_LineCmd = ENABLE;
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EXTI_Init(&exit);
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Interrupt.SetPriority(RTCAlarm_IRQn, 0);
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Interrupt.Activate(RTCAlarm_IRQn, AlarmHandler, this);
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}
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}
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void HardRTC::LoadTime()
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{
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if(!Opened) return;
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auto& time = (TTime&)Time;
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// 计数器记录保存时间以来经过的毫秒数
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uint ms = RTC_GetCounter();
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// 采用第二个后备寄存器保存秒以上的数据
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uint sec = ReadBackup(2);
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// 谨记sec + ms/1000就是当前绝对时间，要减去系统启动以来的总秒数，才能作为系统基准时间
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time.BaseSeconds = sec + (ms / 1000) - time.Seconds;
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}
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void HardRTC::SaveTime()
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{
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if(!Opened) return;
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if(g_NextSave > 0 && Time.Seconds < g_NextSave) return;
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#if TIME_DEBUG
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if(g_NextSave == 0)
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{
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debug_printf("LoadTime: ");
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DateTime::Now().Show(true);
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}
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#endif
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/* 等待最近一次对RTC寄存器的写操作完成，也即等待RTC寄存器同步 */
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RTC_WaitForSynchro();
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uint sec = Time.BaseSeconds + Time.Seconds;
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uint ms = (uint)(Time.Current() - Time.Milliseconds);
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#if TIME_DEBUG
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debug_printf("SaveTime %ds %dms\r\n", sec, ms);
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#endif
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// 绝对总秒数存储后备寄存器
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WriteBackup(2, sec);
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// 剩余毫秒数设置计数器
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RTC_SetCounter(ms);
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// 必须打开时钟和后备域，否则写不进去时间
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// Check if the Power On Reset flag is set
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//RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
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/* Allow access to BKP Domain */
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//PWR_BackupAccessCmd(ENABLE);
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// 这里对时间要求非常苛刻，不能等待
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RTC_WaitForLastTask2();
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// 每秒钟保存一次
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g_NextSave = Time.Seconds + 5;
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}
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// 暂停系统一段时间
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int HardRTC::Sleep(int ms)
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{
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if(!Opened || !LowPower) return ms;
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if(ms <= 0) return 0;
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//int second = ms / 1000;
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//if(second <= 0) return;
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#if TIME_DEBUG
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debug_printf("进入低功耗模式 %d 毫秒\r\n", ms);
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#endif
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//SaveTime();
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// 打开RTC报警中断
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RTC_ITConfig(RTC_IT_ALR, ENABLE);
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// 设定报警时间
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RTC_SetAlarm(RTC_GetCounter() + ms);
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//RTC_SetCounter(0);
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//RTC_SetAlarm(ms);
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// 等待写入操作完成
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RTC_WaitForLastTask2();
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Sys.Trace(1);
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// 进入低功耗模式
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//PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFI);
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// 直接进入低功耗，不去控制电源，唤醒以后不需要配置系统时钟
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__WFI();
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//debug_printf("离开低功耗模式\r\n");
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return 0;
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}
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uint HardRTC::ReadBackup(byte addr)
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{
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if(!Opened) return 0;
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// BKP寄存器是16位，小端写入
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uint v = BKP_ReadBackupRegister(BKP_DR1 + (addr << 2));
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addr++;
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v |= BKP_ReadBackupRegister(BKP_DR1 + (addr << 2)) << 16;
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return v;
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}
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void HardRTC::WriteBackup(byte addr, uint value)
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{
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if(!Opened) return;
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// BKP寄存器是16位，小端写入
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BKP_WriteBackupRegister(BKP_DR1 + (addr << 2), value & 0xFFFF);
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addr++;
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BKP_WriteBackupRegister(BKP_DR1 + (addr << 2), value >> 16);
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}
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// 从停止模式醒来后配置系统时钟，打开HSE/PLL，选择PLL作为系统时钟源
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void SYSCLKConfig_STOP(void)
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{
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/* Enable HSE */
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RCC_HSEConfig(RCC_HSE_ON);
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/* Wait till HSE is ready */
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if(RCC_WaitForHSEStartUp() == SUCCESS)
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{
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#ifdef STM32F10X_CL
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/* Enable PLL2 */
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RCC_PLL2Cmd(ENABLE);
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/* Wait till PLL2 is ready */
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while(RCC_GetFlagStatus(RCC_FLAG_PLL2RDY) == RESET);
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#endif
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/* Enable PLL */
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RCC_PLLCmd(ENABLE);
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/* Wait till PLL is ready */
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while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);
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/* Select PLL as system clock source */
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RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
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/* Wait till PLL is used as system clock source */
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while(RCC_GetSYSCLKSource() != 0x08);
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}
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}
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void AlarmHandler(ushort num, void* param)
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{
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SmartIRQ irq;
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Sys.Trace(4);
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//HardRTC* rtc = (HardRTC*)param;
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if(RTC_GetITStatus(RTC_IT_ALR) != RESET)
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{
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EXTI_ClearITPendingBit(EXTI_Line17);
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// 检查唤醒标志是否设置
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if(PWR_GetFlagStatus(PWR_FLAG_WU) != RESET) PWR_ClearFlag(PWR_FLAG_WU);
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RTC_WaitForLastTask2();
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RTC_ClearITPendingBit(RTC_IT_ALR);
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RTC_WaitForLastTask2();
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}
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//SYSCLKConfig_STOP();
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//rtc->LoadTime();
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#if TIME_DEBUG
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debug_printf("离开低功耗模式\r\n");
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#endif
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}
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