Max Regan
a7f1ffc1b5
The display currently shows the time, with hours and minutes, and is capable of receiving input with buttons (though does nothing). It sleeps during intervals where nothing is happening. The display task runs once per second, and RTC alarm A is used for periodic alarms to update the system time.
66 lines
2.1 KiB
C++
66 lines
2.1 KiB
C++
/*
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* Copyright (C) 2019 Max Regan
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "SystemTime.h"
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#include "LowPower.h"
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#include "macros.h"
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#include "stm32l0xx.h"
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namespace BSP {
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using Common::ReturnCode;
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ReturnCode LowPower::init()
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{
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/* Enable Clocks */
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SET(RCC->APB1ENR, RCC_APB1ENR_PWREN);
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// FIXME: Make these configurable, will mess with power consumption
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SET(DBGMCU->CR, DBGMCU_CR_DBG_STOP);
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SET(DBGMCU->CR, DBGMCU_CR_DBG_SLEEP);
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SET(DBGMCU->CR, DBGMCU_CR_DBG_STANDBY);
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return ReturnCode::OK;
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}
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ReturnCode LowPower::sleep()
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{
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// TODO: unimplemented
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return ReturnCode::FAIL;
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}
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ReturnCode LowPower::stop()
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{
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SET(PWR->CR, PWR_CR_CWUF); // clear wakeup flag
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while(PWR->CSR & PWR_CSR_WUF) {};
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CLR(PWR->CR, PWR_CR_PDDS); // Enter stop mode when the CPU enters deepsleep
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CLR(RCC->CFGR, RCC_CFGR_STOPWUCK); // MSI oscillator is wake-up from stop clock
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SET(SCB->SCR, SCB_SCR_SLEEPDEEP_Msk); // low-power mode = stop mode
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__WFI(); // enter low-power mode (Wake from interrupt)
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return ReturnCode::OK;
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}
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}
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