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547 lines
18 KiB
547 lines
18 KiB
/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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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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*
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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 <stdio.h>
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#include STM32_HAL_H
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#include "py/runtime.h"
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#include "rtc.h"
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/// \moduleref pyb
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/// \class RTC - real time clock
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///
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/// The RTC is and independent clock that keeps track of the date
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/// and time.
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///
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/// Example usage:
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///
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/// rtc = pyb.RTC()
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/// rtc.datetime((2014, 5, 1, 4, 13, 0, 0, 0))
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/// print(rtc.datetime())
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RTC_HandleTypeDef RTCHandle;
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// rtc_info indicates various things about RTC startup
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// it's a bit of a hack at the moment
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static mp_uint_t rtc_info;
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// Note: LSI is around (32KHz), these dividers should work either way
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// ck_spre(1Hz) = RTCCLK(LSE) /(uwAsynchPrediv + 1)*(uwSynchPrediv + 1)
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#define RTC_ASYNCH_PREDIV (0x7f)
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#define RTC_SYNCH_PREDIV (0x00ff)
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#if 0
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#define RTC_INFO_USE_EXISTING (0)
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#define RTC_INFO_USE_LSE (1)
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#define RTC_INFO_USE_LSI (3)
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void rtc_init(void) {
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// Enable the PWR clock
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
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// Allow access to RTC
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PWR_BackupAccessCmd(ENABLE);
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if (RTC_ReadBackupRegister(RTC_BKP_DR0) == 0x32F2) {
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// RTC still alive, so don't re-init it
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// wait for RTC APB register synchronisation
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RTC_WaitForSynchro();
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rtc_info = RTC_INFO_USE_EXISTING;
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return;
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}
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uint32_t timeout = 10000000;
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// Enable the PWR clock
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
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// Allow access to RTC
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PWR_BackupAccessCmd(ENABLE);
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// Enable the LSE OSC
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RCC_LSEConfig(RCC_LSE_ON);
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// Wait till LSE is ready
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mp_uint_t sys_tick = sys_tick_counter;
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while((RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET) && (--timeout > 0)) {
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}
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// record how long it took for the RTC to start up
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rtc_info = (sys_tick_counter - sys_tick) << 2;
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// If LSE timed out, use LSI instead
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if (timeout == 0) {
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// Disable the LSE OSC
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RCC_LSEConfig(RCC_LSE_OFF);
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// Enable the LSI OSC
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RCC_LSICmd(ENABLE);
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// Wait till LSI is ready
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while(RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) {
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}
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// Use LSI as the RTC Clock Source
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RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);
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// record that we are using the LSI
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rtc_info |= RTC_INFO_USE_LSI;
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} else {
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// Use LSE as the RTC Clock Source
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RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
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// record that we are using the LSE
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rtc_info |= RTC_INFO_USE_LSE;
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}
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// Note: LSI is around (32KHz), these dividers should work either way
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// ck_spre(1Hz) = RTCCLK(LSE) /(uwAsynchPrediv + 1)*(uwSynchPrediv + 1)
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uint32_t uwSynchPrediv = 0xFF;
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uint32_t uwAsynchPrediv = 0x7F;
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// Enable the RTC Clock
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RCC_RTCCLKCmd(ENABLE);
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// Wait for RTC APB registers synchronisation
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RTC_WaitForSynchro();
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// Configure the RTC data register and RTC prescaler
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RTC_InitTypeDef RTC_InitStructure;
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RTC_InitStructure.RTC_AsynchPrediv = uwAsynchPrediv;
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RTC_InitStructure.RTC_SynchPrediv = uwSynchPrediv;
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RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;
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RTC_Init(&RTC_InitStructure);
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// Set the date (BCD)
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RTC_DateTypeDef RTC_DateStructure;
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RTC_DateStructure.RTC_Year = 0x13;
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RTC_DateStructure.RTC_Month = RTC_Month_October;
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RTC_DateStructure.RTC_Date = 0x26;
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RTC_DateStructure.RTC_WeekDay = RTC_Weekday_Saturday;
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RTC_SetDate(RTC_Format_BCD, &RTC_DateStructure);
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// Set the time (BCD)
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RTC_TimeTypeDef RTC_TimeStructure;
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RTC_TimeStructure.RTC_H12 = RTC_H12_AM;
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RTC_TimeStructure.RTC_Hours = 0x01;
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RTC_TimeStructure.RTC_Minutes = 0x53;
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RTC_TimeStructure.RTC_Seconds = 0x00;
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RTC_SetTime(RTC_Format_BCD, &RTC_TimeStructure);
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// Indicator for the RTC configuration
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RTC_WriteBackupRegister(RTC_BKP_DR0, 0x32F2);
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}
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#endif
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STATIC void RTC_CalendarConfig(void);
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void rtc_init(void) {
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RTCHandle.Instance = RTC;
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/* Configure RTC prescaler and RTC data registers */
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/* RTC configured as follow:
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- Hour Format = Format 24
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- Asynch Prediv = Value according to source clock
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- Synch Prediv = Value according to source clock
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- OutPut = Output Disable
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- OutPutPolarity = High Polarity
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- OutPutType = Open Drain */
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RTCHandle.Init.HourFormat = RTC_HOURFORMAT_24;
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RTCHandle.Init.AsynchPrediv = RTC_ASYNCH_PREDIV;
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RTCHandle.Init.SynchPrediv = RTC_SYNCH_PREDIV;
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RTCHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
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RTCHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
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RTCHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
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mp_uint_t tick = HAL_GetTick();
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if (HAL_RTC_Init(&RTCHandle) != HAL_OK) {
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// init error
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rtc_info = 0xffff; // indicate error
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return;
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}
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// record how long it took for the RTC to start up
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rtc_info = HAL_GetTick() - tick;
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// check data stored in BackUp register0
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if (HAL_RTCEx_BKUPRead(&RTCHandle, RTC_BKP_DR0) != 0x32f2) {
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// fresh reset; configure RTC Calendar
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RTC_CalendarConfig();
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} else {
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// RTC was previously set, so leave it alone
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if(__HAL_RCC_GET_FLAG(RCC_FLAG_PORRST) != RESET) {
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// power on reset occurred
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rtc_info |= 0x10000;
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}
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if(__HAL_RCC_GET_FLAG(RCC_FLAG_PINRST) != RESET) {
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// external reset occurred
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rtc_info |= 0x20000;
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}
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// Clear source Reset Flag
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__HAL_RCC_CLEAR_RESET_FLAGS();
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}
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}
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STATIC void RTC_CalendarConfig(void) {
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// set the date to 1st Jan 2014
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RTC_DateTypeDef date;
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date.Year = 14;
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date.Month = 1;
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date.Date = 1;
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date.WeekDay = RTC_WEEKDAY_WEDNESDAY;
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if(HAL_RTC_SetDate(&RTCHandle, &date, FORMAT_BIN) != HAL_OK) {
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// init error
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return;
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}
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// set the time to 00:00:00
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RTC_TimeTypeDef time;
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time.Hours = 0;
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time.Minutes = 0;
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time.Seconds = 0;
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time.TimeFormat = RTC_HOURFORMAT12_AM;
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time.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
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time.StoreOperation = RTC_STOREOPERATION_RESET;
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if (HAL_RTC_SetTime(&RTCHandle, &time, FORMAT_BIN) != HAL_OK) {
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// init error
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return;
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}
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// write data to indicate the RTC has been set
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HAL_RTCEx_BKUPWrite(&RTCHandle, RTC_BKP_DR0, 0x32f2);
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}
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/*
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Note: Care must be taken when HAL_RCCEx_PeriphCLKConfig() is used to select
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the RTC clock source; in this case the Backup domain will be reset in
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order to modify the RTC Clock source, as consequence RTC registers (including
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the backup registers) and RCC_BDCR register are set to their reset values.
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*/
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void HAL_RTC_MspInit(RTC_HandleTypeDef *hrtc) {
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RCC_OscInitTypeDef RCC_OscInitStruct;
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RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;
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/* To change the source clock of the RTC feature (LSE, LSI), You have to:
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- Enable the power clock using __PWR_CLK_ENABLE()
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- Enable write access using HAL_PWR_EnableBkUpAccess() function before to
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configure the RTC clock source (to be done once after reset).
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- Reset the Back up Domain using __HAL_RCC_BACKUPRESET_FORCE() and
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__HAL_RCC_BACKUPRESET_RELEASE().
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- Configure the needed RTc clock source */
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// RTC clock source uses LSE (external crystal) only if relevant
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// configuration variable is set. Otherwise it uses LSI (internal osc).
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RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
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RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
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#if defined(MICROPY_HW_RTC_USE_LSE) && MICROPY_HW_RTC_USE_LSE
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RCC_OscInitStruct.LSEState = RCC_LSE_ON;
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RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
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#else
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RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
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RCC_OscInitStruct.LSIState = RCC_LSI_ON;
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#endif
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if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
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//Error_Handler();
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return;
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}
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PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;
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#if defined(MICROPY_HW_RTC_USE_LSE) && MICROPY_HW_RTC_USE_LSE
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PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSE;
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#else
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PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSI;
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#endif
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if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK) {
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//Error_Handler();
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return;
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}
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// enable RTC peripheral clock
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__HAL_RCC_RTC_ENABLE();
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}
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void HAL_RTC_MspDeInit(RTC_HandleTypeDef *hrtc) {
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__HAL_RCC_RTC_DISABLE();
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}
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/******************************************************************************/
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// Micro Python bindings
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typedef struct _pyb_rtc_obj_t {
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mp_obj_base_t base;
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} pyb_rtc_obj_t;
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STATIC const pyb_rtc_obj_t pyb_rtc_obj = {{&pyb_rtc_type}};
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/// \classmethod \constructor()
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/// Create an RTC object.
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STATIC mp_obj_t pyb_rtc_make_new(mp_obj_t type_in, mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args) {
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// check arguments
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mp_arg_check_num(n_args, n_kw, 0, 0, false);
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// return constant object
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return (mp_obj_t)&pyb_rtc_obj;
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}
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/// \method info()
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/// Get information about the startup time and reset source.
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///
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/// - The lower 0xffff are the number of milliseconds the RTC took to
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/// start up.
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/// - Bit 0x10000 is set if a power-on reset occurred.
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/// - Bit 0x20000 is set if an external reset occurred
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mp_obj_t pyb_rtc_info(mp_obj_t self_in) {
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return mp_obj_new_int(rtc_info);
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}
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MP_DEFINE_CONST_FUN_OBJ_1(pyb_rtc_info_obj, pyb_rtc_info);
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/// \method datetime([datetimetuple])
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/// Get or set the date and time of the RTC.
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///
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/// With no arguments, this method returns an 8-tuple with the current
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/// date and time. With 1 argument (being an 8-tuple) it sets the date
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/// and time.
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///
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/// The 8-tuple has the following format:
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///
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/// (year, month, day, weekday, hours, minutes, seconds, subseconds)
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///
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/// `weekday` is 1-7 for Monday through Sunday.
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///
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/// `subseconds` counts down from 255 to 0
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mp_obj_t pyb_rtc_datetime(mp_uint_t n_args, const mp_obj_t *args) {
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if (n_args == 1) {
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// get date and time
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// note: need to call get time then get date to correctly access the registers
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RTC_DateTypeDef date;
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RTC_TimeTypeDef time;
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HAL_RTC_GetTime(&RTCHandle, &time, FORMAT_BIN);
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HAL_RTC_GetDate(&RTCHandle, &date, FORMAT_BIN);
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mp_obj_t tuple[8] = {
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mp_obj_new_int(2000 + date.Year),
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mp_obj_new_int(date.Month),
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mp_obj_new_int(date.Date),
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mp_obj_new_int(date.WeekDay),
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mp_obj_new_int(time.Hours),
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mp_obj_new_int(time.Minutes),
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mp_obj_new_int(time.Seconds),
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mp_obj_new_int(time.SubSeconds),
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};
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return mp_obj_new_tuple(8, tuple);
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} else {
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// set date and time
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mp_obj_t *items;
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mp_obj_get_array_fixed_n(args[1], 8, &items);
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RTC_DateTypeDef date;
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date.Year = mp_obj_get_int(items[0]) - 2000;
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date.Month = mp_obj_get_int(items[1]);
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date.Date = mp_obj_get_int(items[2]);
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date.WeekDay = mp_obj_get_int(items[3]);
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HAL_RTC_SetDate(&RTCHandle, &date, FORMAT_BIN);
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RTC_TimeTypeDef time;
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time.Hours = mp_obj_get_int(items[4]);
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time.Minutes = mp_obj_get_int(items[5]);
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time.Seconds = mp_obj_get_int(items[6]);
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time.SubSeconds = mp_obj_get_int(items[7]);
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time.TimeFormat = RTC_HOURFORMAT12_AM;
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time.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
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time.StoreOperation = RTC_STOREOPERATION_SET;
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HAL_RTC_SetTime(&RTCHandle, &time, FORMAT_BIN);
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return mp_const_none;
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}
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}
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MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_rtc_datetime_obj, 1, 2, pyb_rtc_datetime);
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// wakeup(None)
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// wakeup(ms, callback=None)
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// wakeup(wucksel, wut, callback)
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mp_obj_t pyb_rtc_wakeup(mp_uint_t n_args, const mp_obj_t *args) {
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// wut is wakeup counter start value, wucksel is clock source
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// counter is decremented at wucksel rate, and wakes the MCU when it gets to 0
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// wucksel=0b000 is RTC/16 (RTC runs at 32768Hz)
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// wucksel=0b001 is RTC/8
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// wucksel=0b010 is RTC/4
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// wucksel=0b011 is RTC/2
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// wucksel=0b100 is 1Hz clock
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// wucksel=0b110 is 1Hz clock with 0x10000 added to wut
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// so a 1 second wakeup could be wut=2047, wucksel=0b000, or wut=4095, wucksel=0b001, etc
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// disable wakeup IRQ while we configure it
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HAL_NVIC_DisableIRQ(RTC_WKUP_IRQn);
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bool enable = false;
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mp_int_t wucksel;
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mp_int_t wut;
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mp_obj_t callback = mp_const_none;
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if (n_args <= 3) {
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if (args[1] == mp_const_none) {
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// disable wakeup
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} else {
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// time given in ms
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mp_int_t ms = mp_obj_get_int(args[1]);
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mp_int_t div = 2;
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wucksel = 3;
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while (div <= 16 && ms > 2000 * div) {
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div *= 2;
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wucksel -= 1;
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}
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if (div <= 16) {
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wut = 32768 / div * ms / 1000;
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} else {
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wucksel = 4;
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wut = ms / 1000;
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if (ms > 0x10000) {
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wucksel = 5;
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ms -= 0x10000;
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if (ms > 0x10000) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "wakeup value too large"));
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}
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}
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}
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wut -= 1;
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enable = true;
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}
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if (n_args == 3) {
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callback = args[2];
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}
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} else {
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// config values given directly
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wucksel = mp_obj_get_int(args[1]);
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wut = mp_obj_get_int(args[2]);
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callback = args[3];
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enable = true;
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}
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// set the callback
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MP_STATE_PORT(pyb_extint_callback)[22] = callback;
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// disable register write protection
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RTC->WPR = 0xca;
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RTC->WPR = 0x53;
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// clear WUTE
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RTC->CR &= ~(1 << 10);
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// wait until WUTWF is set
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while (!(RTC->ISR & (1 << 2))) {
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}
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if (enable) {
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// program WUT
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RTC->WUTR = wut;
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// set WUTIE to enable wakeup interrupts
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// set WUTE to enable wakeup
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// program WUCKSEL
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RTC->CR |= (1 << 14) | (1 << 10) | (wucksel & 7);
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// enable register write protection
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RTC->WPR = 0xff;
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// enable external interrupts on line 22
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EXTI->IMR |= 1 << 22;
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EXTI->RTSR |= 1 << 22;
|
|
|
|
// clear interrupt flags
|
|
RTC->ISR &= ~(1 << 10);
|
|
EXTI->PR = 1 << 22;
|
|
|
|
HAL_NVIC_SetPriority(RTC_WKUP_IRQn, 0x0f, 0x0f);
|
|
HAL_NVIC_EnableIRQ(RTC_WKUP_IRQn);
|
|
|
|
//printf("wut=%d wucksel=%d\n", wut, wucksel);
|
|
} else {
|
|
// clear WUTIE to disable interrupts
|
|
RTC->CR &= ~(1 << 14);
|
|
|
|
// enable register write protection
|
|
RTC->WPR = 0xff;
|
|
|
|
// disable external interrupts on line 22
|
|
EXTI->IMR &= ~(1 << 22);
|
|
}
|
|
|
|
return mp_const_none;
|
|
}
|
|
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_rtc_wakeup_obj, 2, 4, pyb_rtc_wakeup);
|
|
|
|
// calibration(None)
|
|
// calibration(cal)
|
|
// When an integer argument is provided, check that it falls in the range [-511 to 512]
|
|
// and set the calibration value; otherwise return calibration value
|
|
mp_obj_t pyb_rtc_calibration(mp_uint_t n_args, const mp_obj_t *args) {
|
|
mp_int_t cal;
|
|
if (n_args == 2) {
|
|
cal = mp_obj_get_int(args[1]);
|
|
mp_uint_t cal_p, cal_m;
|
|
if (cal < -511 || cal > 512) {
|
|
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError,
|
|
"calibration value out of range"));
|
|
}
|
|
if (cal > 0) {
|
|
cal_p = RTC_SMOOTHCALIB_PLUSPULSES_SET;
|
|
cal_m = 512 - cal;
|
|
} else {
|
|
cal_p = RTC_SMOOTHCALIB_PLUSPULSES_RESET;
|
|
cal_m = -cal;
|
|
}
|
|
HAL_RTCEx_SetSmoothCalib(&RTCHandle, RTC_SMOOTHCALIB_PERIOD_32SEC, cal_p, cal_m);
|
|
return mp_const_none;
|
|
} else {
|
|
// printf("CALR = 0x%x\n", (mp_uint_t) RTCHandle.Instance->CALR); // DEBUG
|
|
// Test if CALP bit is set in CALR:
|
|
if (RTCHandle.Instance->CALR & 0x8000) {
|
|
cal = 512 - (RTCHandle.Instance->CALR & 0x1ff);
|
|
} else {
|
|
cal = -(RTCHandle.Instance->CALR & 0x1ff);
|
|
}
|
|
return mp_obj_new_int(cal);
|
|
}
|
|
}
|
|
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_rtc_calibration_obj, 1, 2, pyb_rtc_calibration);
|
|
|
|
STATIC const mp_map_elem_t pyb_rtc_locals_dict_table[] = {
|
|
{ MP_OBJ_NEW_QSTR(MP_QSTR_info), (mp_obj_t)&pyb_rtc_info_obj },
|
|
{ MP_OBJ_NEW_QSTR(MP_QSTR_datetime), (mp_obj_t)&pyb_rtc_datetime_obj },
|
|
{ MP_OBJ_NEW_QSTR(MP_QSTR_wakeup), (mp_obj_t)&pyb_rtc_wakeup_obj },
|
|
{ MP_OBJ_NEW_QSTR(MP_QSTR_calibration), (mp_obj_t)&pyb_rtc_calibration_obj },
|
|
};
|
|
STATIC MP_DEFINE_CONST_DICT(pyb_rtc_locals_dict, pyb_rtc_locals_dict_table);
|
|
|
|
const mp_obj_type_t pyb_rtc_type = {
|
|
{ &mp_type_type },
|
|
.name = MP_QSTR_RTC,
|
|
.make_new = pyb_rtc_make_new,
|
|
.locals_dict = (mp_obj_t)&pyb_rtc_locals_dict,
|
|
};
|
|
|