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micropython/ports/stm32/rtc.c
Damien George 8f20cdc353 all: Rename absolute time-based functions to include "epoch". 
For time-based functions that work with absolute time there is the need for
an Epoch, to set the zero-point at which the absolute time starts counting.
Such functions include time.time() and filesystem stat return values.  And
different ports may use a different Epoch.

To make it clearer what functions use the Epoch (whatever it may be), and
make the ports more consistent with their use of the Epoch, this commit
renames all Epoch related functions to include the word "epoch" in their
name (and remove references to "2000").

Along with this rename, the following things have changed:

- mp_hal_time_ns() is now specified to return the number of nanoseconds
  since the Epoch, rather than since 1970 (but since this is an internal
  function it doesn't change anything for the user).

- littlefs timestamps on the esp8266 have been fixed (they were previously
  off by 30 years in nanoseconds).

Otherwise, there is no functional change made by this commit.

Signed-off-by: Damien George <damien@micropython.org>
2020-09-18 17:20:34 +10:00

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdio.h>
#include "py/runtime.h"
#include "lib/timeutils/timeutils.h"
#include "extint.h"
#include "rtc.h"
#include "irq.h"
#if defined(STM32WB)
#define RCC_CSR_LSION RCC_CSR_LSI1ON
#define RCC_FLAG_LSIRDY RCC_FLAG_LSI1RDY
#define RCC_OSCILLATORTYPE_LSI RCC_OSCILLATORTYPE_LSI1
#define __HAL_RCC_LSI_ENABLE __HAL_RCC_LSI1_ENABLE
#define __HAL_RCC_LSI_DISABLE __HAL_RCC_LSI1_DISABLE
#endif
/// \moduleref pyb
/// \class RTC - real time clock
///
/// The RTC is and independent clock that keeps track of the date
/// and time.
///
/// Example usage:
///
/// rtc = pyb.RTC()
/// rtc.datetime((2014, 5, 1, 4, 13, 0, 0, 0))
/// print(rtc.datetime())
RTC_HandleTypeDef RTCHandle;
// rtc_info indicates various things about RTC startup
// it's a bit of a hack at the moment
static mp_uint_t rtc_info;
// Note: LSI is around (32KHz), these dividers should work either way
// ck_spre(1Hz) = RTCCLK(LSE) /(uwAsynchPrediv + 1)*(uwSynchPrediv + 1)
// modify RTC_ASYNCH_PREDIV & RTC_SYNCH_PREDIV in board/<BN>/mpconfigport.h to change sub-second ticks
// default is 3906.25 us, min is ~30.52 us (will increase Ivbat by ~500nA)
#ifndef RTC_ASYNCH_PREDIV
#define RTC_ASYNCH_PREDIV (0x7f)
#endif
#ifndef RTC_SYNCH_PREDIV
#define RTC_SYNCH_PREDIV (0x00ff)
#endif
STATIC HAL_StatusTypeDef PYB_RTC_Init(RTC_HandleTypeDef *hrtc);
STATIC void PYB_RTC_MspInit_Kick(RTC_HandleTypeDef *hrtc, bool rtc_use_lse, bool rtc_use_byp);
STATIC HAL_StatusTypeDef PYB_RTC_MspInit_Finalise(RTC_HandleTypeDef *hrtc);
STATIC void RTC_CalendarConfig(void);
#if MICROPY_HW_RTC_USE_LSE || MICROPY_HW_RTC_USE_BYPASS
STATIC bool rtc_use_lse = true;
#else
STATIC bool rtc_use_lse = false;
#endif
STATIC uint32_t rtc_startup_tick;
STATIC bool rtc_need_init_finalise = false;
#if defined(STM32L0)
#define BDCR CSR
#define RCC_BDCR_RTCEN RCC_CSR_RTCEN
#define RCC_BDCR_RTCSEL RCC_CSR_RTCSEL
#define RCC_BDCR_RTCSEL_0 RCC_CSR_RTCSEL_0
#define RCC_BDCR_RTCSEL_1 RCC_CSR_RTCSEL_1
#define RCC_BDCR_LSEON RCC_CSR_LSEON
#define RCC_BDCR_LSERDY RCC_CSR_LSERDY
#define RCC_BDCR_LSEBYP RCC_CSR_LSEBYP
#endif
void rtc_init_start(bool force_init) {
RTCHandle.Instance = RTC;
/* Configure RTC prescaler and RTC data registers */
/* RTC configured as follow:
- Hour Format = Format 24
- Asynch Prediv = Value according to source clock
- Synch Prediv = Value according to source clock
- OutPut = Output Disable
- OutPutPolarity = High Polarity
- OutPutType = Open Drain */
RTCHandle.Init.HourFormat = RTC_HOURFORMAT_24;
RTCHandle.Init.AsynchPrediv = RTC_ASYNCH_PREDIV;
RTCHandle.Init.SynchPrediv = RTC_SYNCH_PREDIV;
RTCHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
RTCHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
RTCHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
rtc_need_init_finalise = false;
if (!force_init) {
uint32_t bdcr = RCC->BDCR;
if ((bdcr & (RCC_BDCR_RTCEN | RCC_BDCR_RTCSEL | RCC_BDCR_LSEON | RCC_BDCR_LSERDY))
== (RCC_BDCR_RTCEN | RCC_BDCR_RTCSEL_0 | RCC_BDCR_LSEON | RCC_BDCR_LSERDY)) {
// LSE is enabled & ready --> no need to (re-)init RTC
// remove Backup Domain write protection
HAL_PWR_EnableBkUpAccess();
// Clear source Reset Flag
__HAL_RCC_CLEAR_RESET_FLAGS();
// provide some status information
rtc_info |= 0x40000 | (RCC->BDCR & 7) | (RCC->CSR & 3) << 8;
return;
} else if ((bdcr & (RCC_BDCR_RTCEN | RCC_BDCR_RTCSEL))
== (RCC_BDCR_RTCEN | RCC_BDCR_RTCSEL_1)) {
// LSI configured as the RTC clock source --> no need to (re-)init RTC
// remove Backup Domain write protection
HAL_PWR_EnableBkUpAccess();
// Clear source Reset Flag
__HAL_RCC_CLEAR_RESET_FLAGS();
// Turn the LSI on (it may need this even if the RTC is running)
RCC->CSR |= RCC_CSR_LSION;
// provide some status information
rtc_info |= 0x80000 | (RCC->BDCR & 7) | (RCC->CSR & 3) << 8;
return;
}
}
rtc_startup_tick = HAL_GetTick();
rtc_info = 0x3f000000 | (rtc_startup_tick & 0xffffff);
PYB_RTC_MspInit_Kick(&RTCHandle, rtc_use_lse, MICROPY_HW_RTC_USE_BYPASS);
}
void rtc_init_finalise() {
if (!rtc_need_init_finalise) {
return;
}
rtc_info = 0;
while (PYB_RTC_Init(&RTCHandle) != HAL_OK) {
if (rtc_use_lse) {
#if MICROPY_HW_RTC_USE_BYPASS
if (RCC->BDCR & RCC_BDCR_LSEBYP) {
// LSEBYP failed, fallback to LSE non-bypass
rtc_info |= 0x02000000;
} else
#endif
{
// LSE failed, fallback to LSI
rtc_use_lse = false;
rtc_info |= 0x01000000;
}
rtc_startup_tick = HAL_GetTick();
PYB_RTC_MspInit_Kick(&RTCHandle, rtc_use_lse, false);
HAL_PWR_EnableBkUpAccess();
RTCHandle.State = HAL_RTC_STATE_RESET;
} else {
// init error
rtc_info |= 0xffff; // indicate error
return;
}
}
// RTC started successfully
rtc_info = 0x20000000;
// record if LSE or LSI is used
rtc_info |= (rtc_use_lse << 28);
// record how long it took for the RTC to start up
rtc_info |= (HAL_GetTick() - rtc_startup_tick) & 0xffff;
// fresh reset; configure RTC Calendar
RTC_CalendarConfig();
#if defined(STM32L4) || defined(STM32WB)
if (__HAL_RCC_GET_FLAG(RCC_FLAG_BORRST) != RESET) {
#else
if (__HAL_RCC_GET_FLAG(RCC_FLAG_PORRST) != RESET) {
#endif
// power on reset occurred
rtc_info |= 0x10000;
}
if (__HAL_RCC_GET_FLAG(RCC_FLAG_PINRST) != RESET) {
// external reset occurred
rtc_info |= 0x20000;
}
// Clear source Reset Flag
__HAL_RCC_CLEAR_RESET_FLAGS();
rtc_need_init_finalise = false;
}
STATIC HAL_StatusTypeDef PYB_RCC_OscConfig(RCC_OscInitTypeDef *RCC_OscInitStruct) {
/*------------------------------ LSI Configuration -------------------------*/
if ((RCC_OscInitStruct->OscillatorType & RCC_OSCILLATORTYPE_LSI) == RCC_OSCILLATORTYPE_LSI) {
// Check the LSI State
if (RCC_OscInitStruct->LSIState != RCC_LSI_OFF) {
// Enable the Internal Low Speed oscillator (LSI).
__HAL_RCC_LSI_ENABLE();
} else {
// Disable the Internal Low Speed oscillator (LSI).
__HAL_RCC_LSI_DISABLE();
}
}
/*------------------------------ LSE Configuration -------------------------*/
if ((RCC_OscInitStruct->OscillatorType & RCC_OSCILLATORTYPE_LSE) == RCC_OSCILLATORTYPE_LSE) {
#if !defined(STM32H7) && !defined(STM32WB)
// Enable Power Clock
__HAL_RCC_PWR_CLK_ENABLE();
#endif
// Enable access to the backup domain
HAL_PWR_EnableBkUpAccess();
uint32_t tickstart = HAL_GetTick();
#if defined(STM32F7) || defined(STM32L4) || defined(STM32H7) || defined(STM32WB)
// __HAL_RCC_PWR_CLK_ENABLE();
// Enable write access to Backup domain
// PWR->CR1 |= PWR_CR1_DBP;
// Wait for Backup domain Write protection disable
while ((PWR->CR1 & PWR_CR1_DBP) == RESET) {
if (HAL_GetTick() - tickstart > RCC_DBP_TIMEOUT_VALUE) {
return HAL_TIMEOUT;
}
}
#else
// Enable write access to Backup domain
// PWR->CR |= PWR_CR_DBP;
// Wait for Backup domain Write protection disable
while ((PWR->CR & PWR_CR_DBP) == RESET) {
if (HAL_GetTick() - tickstart > RCC_DBP_TIMEOUT_VALUE) {
return HAL_TIMEOUT;
}
}
#endif
#if MICROPY_HW_RTC_USE_BYPASS
// If LSEBYP is enabled and new state is non-bypass then disable LSEBYP
if (RCC_OscInitStruct->LSEState == RCC_LSE_ON && (RCC->BDCR & RCC_BDCR_LSEBYP)) {
CLEAR_BIT(RCC->BDCR, RCC_BDCR_LSEON);
while (RCC->BDCR & RCC_BDCR_LSERDY) {
}
CLEAR_BIT(RCC->BDCR, RCC_BDCR_LSEBYP);
}
#endif
// Set the new LSE configuration
__HAL_RCC_LSE_CONFIG(RCC_OscInitStruct->LSEState);
}
return HAL_OK;
}
STATIC HAL_StatusTypeDef PYB_RTC_Init(RTC_HandleTypeDef *hrtc) {
// Check the RTC peripheral state
if (hrtc == NULL) {
return HAL_ERROR;
}
if (hrtc->State == HAL_RTC_STATE_RESET) {
// Allocate lock resource and initialize it
hrtc->Lock = HAL_UNLOCKED;
// Initialize RTC MSP
if (PYB_RTC_MspInit_Finalise(hrtc) != HAL_OK) {
return HAL_ERROR;
}
}
// Set RTC state
hrtc->State = HAL_RTC_STATE_BUSY;
// Disable the write protection for RTC registers
__HAL_RTC_WRITEPROTECTION_DISABLE(hrtc);
// Set Initialization mode
if (RTC_EnterInitMode(hrtc) != HAL_OK) {
// Enable the write protection for RTC registers
__HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);
// Set RTC state
hrtc->State = HAL_RTC_STATE_ERROR;
return HAL_ERROR;
} else {
// Clear RTC_CR FMT, OSEL and POL Bits
hrtc->Instance->CR &= ((uint32_t) ~(RTC_CR_FMT | RTC_CR_OSEL | RTC_CR_POL));
// Set RTC_CR register
hrtc->Instance->CR |= (uint32_t)(hrtc->Init.HourFormat | hrtc->Init.OutPut | hrtc->Init.OutPutPolarity);
// Configure the RTC PRER
hrtc->Instance->PRER = (uint32_t)(hrtc->Init.SynchPrediv);
hrtc->Instance->PRER |= (uint32_t)(hrtc->Init.AsynchPrediv << 16);
// Exit Initialization mode
hrtc->Instance->ISR &= (uint32_t) ~RTC_ISR_INIT;
#if defined(STM32L0) || defined(STM32L4) || defined(STM32H7) || defined(STM32WB)
hrtc->Instance->OR &= (uint32_t) ~RTC_OR_ALARMOUTTYPE;
hrtc->Instance->OR |= (uint32_t)(hrtc->Init.OutPutType);
#elif defined(STM32F7)
hrtc->Instance->OR &= (uint32_t) ~RTC_OR_ALARMTYPE;
hrtc->Instance->OR |= (uint32_t)(hrtc->Init.OutPutType);
#else
hrtc->Instance->TAFCR &= (uint32_t) ~RTC_TAFCR_ALARMOUTTYPE;
hrtc->Instance->TAFCR |= (uint32_t)(hrtc->Init.OutPutType);
#endif
// Enable the write protection for RTC registers
__HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);
// Set RTC state
hrtc->State = HAL_RTC_STATE_READY;
return HAL_OK;
}
}
STATIC void PYB_RTC_MspInit_Kick(RTC_HandleTypeDef *hrtc, bool rtc_use_lse, bool rtc_use_byp) {
/* To change the source clock of the RTC feature (LSE, LSI), You have to:
- Enable the power clock using __PWR_CLK_ENABLE()
- Enable write access using HAL_PWR_EnableBkUpAccess() function before to
configure the RTC clock source (to be done once after reset).
- Reset the Back up Domain using __HAL_RCC_BACKUPRESET_FORCE() and
__HAL_RCC_BACKUPRESET_RELEASE().
- Configure the needed RTc clock source */
// RTC clock source uses LSE (external crystal) only if relevant
// configuration variable is set. Otherwise it uses LSI (internal osc).
RCC_OscInitTypeDef RCC_OscInitStruct;
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
#if MICROPY_HW_RTC_USE_BYPASS
if (rtc_use_byp) {
RCC_OscInitStruct.LSEState = RCC_LSE_BYPASS;
RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
} else
#endif
if (rtc_use_lse) {
RCC_OscInitStruct.LSEState = RCC_LSE_ON;
RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
} else {
RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
RCC_OscInitStruct.LSIState = RCC_LSI_ON;
}
PYB_RCC_OscConfig(&RCC_OscInitStruct);
// now ramp up osc. in background and flag calendear init needed
rtc_need_init_finalise = true;
}
#ifndef MICROPY_HW_RTC_LSE_TIMEOUT_MS
#define MICROPY_HW_RTC_LSE_TIMEOUT_MS 1000 // ST docs spec 2000 ms LSE startup, seems to be too pessimistic
#endif
#ifndef MICROPY_HW_RTC_LSI_TIMEOUT_MS
#define MICROPY_HW_RTC_LSI_TIMEOUT_MS 500 // this is way too pessimistic, typ. < 1ms
#endif
#ifndef MICROPY_HW_RTC_BYP_TIMEOUT_MS
#define MICROPY_HW_RTC_BYP_TIMEOUT_MS 150
#endif
STATIC HAL_StatusTypeDef PYB_RTC_MspInit_Finalise(RTC_HandleTypeDef *hrtc) {
// we already had a kick so now wait for the corresponding ready state...
if (rtc_use_lse) {
// we now have to wait for LSE ready or timeout
uint32_t timeout = MICROPY_HW_RTC_LSE_TIMEOUT_MS;
#if MICROPY_HW_RTC_USE_BYPASS
if (RCC->BDCR & RCC_BDCR_LSEBYP) {
timeout = MICROPY_HW_RTC_BYP_TIMEOUT_MS;
}
#endif
uint32_t tickstart = rtc_startup_tick;
while (__HAL_RCC_GET_FLAG(RCC_FLAG_LSERDY) == RESET) {
if ((HAL_GetTick() - tickstart) > timeout) {
return HAL_TIMEOUT;
}
}
} else {
// we now have to wait for LSI ready or timeout
uint32_t tickstart = rtc_startup_tick;
while (__HAL_RCC_GET_FLAG(RCC_FLAG_LSIRDY) == RESET) {
if ((HAL_GetTick() - tickstart) > MICROPY_HW_RTC_LSI_TIMEOUT_MS) {
return HAL_TIMEOUT;
}
}
}
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;
if (rtc_use_lse) {
PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSE;
} else {
PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSI;
}
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK) {
// Error_Handler();
return HAL_ERROR;
}
// enable RTC peripheral clock
__HAL_RCC_RTC_ENABLE();
return HAL_OK;
}
STATIC void RTC_CalendarConfig(void) {
// set the date to 1st Jan 2015
RTC_DateTypeDef date;
date.Year = 15;
date.Month = 1;
date.Date = 1;
date.WeekDay = RTC_WEEKDAY_THURSDAY;
if (HAL_RTC_SetDate(&RTCHandle, &date, RTC_FORMAT_BIN) != HAL_OK) {
// init error
return;
}
// set the time to 00:00:00
RTC_TimeTypeDef time;
time.Hours = 0;
time.Minutes = 0;
time.Seconds = 0;
time.TimeFormat = RTC_HOURFORMAT12_AM;
time.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
time.StoreOperation = RTC_STOREOPERATION_RESET;
if (HAL_RTC_SetTime(&RTCHandle, &time, RTC_FORMAT_BIN) != HAL_OK) {
// init error
return;
}
}
uint64_t mp_hal_time_ns(void) {
uint64_t ns = 0;
#if MICROPY_HW_ENABLE_RTC
// Get current according to the RTC.
rtc_init_finalise();
RTC_TimeTypeDef time;
RTC_DateTypeDef date;
HAL_RTC_GetTime(&RTCHandle, &time, RTC_FORMAT_BIN);
HAL_RTC_GetDate(&RTCHandle, &date, RTC_FORMAT_BIN);
ns = timeutils_seconds_since_epoch(2000 + date.Year, date.Month, date.Date, time.Hours, time.Minutes, time.Seconds);
ns *= 1000000000ULL;
uint32_t usec = ((RTC_SYNCH_PREDIV - time.SubSeconds) * (1000000 / 64)) / ((RTC_SYNCH_PREDIV + 1) / 64);
ns += usec * 1000;
#endif
return ns;
}
/******************************************************************************/
// MicroPython bindings
typedef struct _pyb_rtc_obj_t {
mp_obj_base_t base;
} pyb_rtc_obj_t;
STATIC const pyb_rtc_obj_t pyb_rtc_obj = {{&pyb_rtc_type}};
/// \classmethod \constructor()
/// Create an RTC object.
STATIC mp_obj_t pyb_rtc_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
// check arguments
mp_arg_check_num(n_args, n_kw, 0, 0, false);
// return constant object
return MP_OBJ_FROM_PTR(&pyb_rtc_obj);
}
// force rtc to re-initialise
mp_obj_t pyb_rtc_init(mp_obj_t self_in) {
rtc_init_start(true);
rtc_init_finalise();
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_1(pyb_rtc_init_obj, pyb_rtc_init);
/// \method info()
/// Get information about the startup time and reset source.
///
/// - The lower 0xffff are the number of milliseconds the RTC took to
/// start up.
/// - Bit 0x10000 is set if a power-on reset occurred.
/// - Bit 0x20000 is set if an external reset occurred
mp_obj_t pyb_rtc_info(mp_obj_t self_in) {
return mp_obj_new_int(rtc_info);
}
MP_DEFINE_CONST_FUN_OBJ_1(pyb_rtc_info_obj, pyb_rtc_info);
/// \method datetime([datetimetuple])
/// Get or set the date and time of the RTC.
///
/// With no arguments, this method returns an 8-tuple with the current
/// date and time. With 1 argument (being an 8-tuple) it sets the date
/// and time.
///
/// The 8-tuple has the following format:
///
/// (year, month, day, weekday, hours, minutes, seconds, subseconds)
///
/// `weekday` is 1-7 for Monday through Sunday.
///
/// `subseconds` counts down from 255 to 0
#define MEG_DIV_64 (1000000 / 64)
#define MEG_DIV_SCALE ((RTC_SYNCH_PREDIV + 1) / 64)
#if defined(MICROPY_HW_RTC_USE_US) && MICROPY_HW_RTC_USE_US
uint32_t rtc_subsec_to_us(uint32_t ss) {
return ((RTC_SYNCH_PREDIV - ss) * MEG_DIV_64) / MEG_DIV_SCALE;
}
uint32_t rtc_us_to_subsec(uint32_t us) {
return RTC_SYNCH_PREDIV - (us * MEG_DIV_SCALE / MEG_DIV_64);
}
#else
#define rtc_us_to_subsec
#define rtc_subsec_to_us
#endif
mp_obj_t pyb_rtc_datetime(size_t n_args, const mp_obj_t *args) {
rtc_init_finalise();
if (n_args == 1) {
// get date and time
// note: need to call get time then get date to correctly access the registers
RTC_DateTypeDef date;
RTC_TimeTypeDef time;
HAL_RTC_GetTime(&RTCHandle, &time, RTC_FORMAT_BIN);
HAL_RTC_GetDate(&RTCHandle, &date, RTC_FORMAT_BIN);
mp_obj_t tuple[8] = {
mp_obj_new_int(2000 + date.Year),
mp_obj_new_int(date.Month),
mp_obj_new_int(date.Date),
mp_obj_new_int(date.WeekDay),
mp_obj_new_int(time.Hours),
mp_obj_new_int(time.Minutes),
mp_obj_new_int(time.Seconds),
mp_obj_new_int(rtc_subsec_to_us(time.SubSeconds)),
};
return mp_obj_new_tuple(8, tuple);
} else {
// set date and time
mp_obj_t *items;
mp_obj_get_array_fixed_n(args[1], 8, &items);
RTC_DateTypeDef date;
date.Year = mp_obj_get_int(items[0]) - 2000;
date.Month = mp_obj_get_int(items[1]);
date.Date = mp_obj_get_int(items[2]);
date.WeekDay = mp_obj_get_int(items[3]);
HAL_RTC_SetDate(&RTCHandle, &date, RTC_FORMAT_BIN);
RTC_TimeTypeDef time;
time.Hours = mp_obj_get_int(items[4]);
time.Minutes = mp_obj_get_int(items[5]);
time.Seconds = mp_obj_get_int(items[6]);
time.TimeFormat = RTC_HOURFORMAT12_AM;
time.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
time.StoreOperation = RTC_STOREOPERATION_SET;
HAL_RTC_SetTime(&RTCHandle, &time, RTC_FORMAT_BIN);
return mp_const_none;
}
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_rtc_datetime_obj, 1, 2, pyb_rtc_datetime);
#if defined(STM32F0) || defined(STM32L0)
#define RTC_WKUP_IRQn RTC_IRQn
#endif
// wakeup(None)
// wakeup(ms, callback=None)
// wakeup(wucksel, wut, callback)
mp_obj_t pyb_rtc_wakeup(size_t n_args, const mp_obj_t *args) {
// wut is wakeup counter start value, wucksel is clock source
// counter is decremented at wucksel rate, and wakes the MCU when it gets to 0
// wucksel=0b000 is RTC/16 (RTC runs at 32768Hz)
// wucksel=0b001 is RTC/8
// wucksel=0b010 is RTC/4
// wucksel=0b011 is RTC/2
// wucksel=0b100 is 1Hz clock
// wucksel=0b110 is 1Hz clock with 0x10000 added to wut
// so a 1 second wakeup could be wut=2047, wucksel=0b000, or wut=4095, wucksel=0b001, etc
rtc_init_finalise();
// disable wakeup IRQ while we configure it
HAL_NVIC_DisableIRQ(RTC_WKUP_IRQn);
bool enable = false;
mp_int_t wucksel;
mp_int_t wut;
mp_obj_t callback = mp_const_none;
if (n_args <= 3) {
if (args[1] == mp_const_none) {
// disable wakeup
} else {
// time given in ms
mp_int_t ms = mp_obj_get_int(args[1]);
mp_int_t div = 2;
wucksel = 3;
while (div <= 16 && ms > 2000 * div) {
div *= 2;
wucksel -= 1;
}
if (div <= 16) {
wut = 32768 / div * ms / 1000;
} else {
// use 1Hz clock
wucksel = 4;
wut = ms / 1000;
if (wut > 0x10000) {
// wut too large for 16-bit register, try to offset by 0x10000
wucksel = 6;
wut -= 0x10000;
if (wut > 0x10000) {
// wut still too large
mp_raise_ValueError(MP_ERROR_TEXT("wakeup value too large"));
}
}
}
// wut register should be 1 less than desired value, but guard against wut=0
if (wut > 0) {
wut -= 1;
}
enable = true;
}
if (n_args == 3) {
callback = args[2];
}
} else {
// config values given directly
wucksel = mp_obj_get_int(args[1]);
wut = mp_obj_get_int(args[2]);
callback = args[3];
enable = true;
}
// set the callback
MP_STATE_PORT(pyb_extint_callback)[EXTI_RTC_WAKEUP] = callback;
// disable register write protection
RTC->WPR = 0xca;
RTC->WPR = 0x53;
// clear WUTE
RTC->CR &= ~RTC_CR_WUTE;
// wait until WUTWF is set
while (!(RTC->ISR & RTC_ISR_WUTWF)) {
}
if (enable) {
// program WUT
RTC->WUTR = wut;
// set WUTIE to enable wakeup interrupts
// set WUTE to enable wakeup
// program WUCKSEL
RTC->CR = (RTC->CR & ~7) | (1 << 14) | (1 << 10) | (wucksel & 7);
// enable register write protection
RTC->WPR = 0xff;
// enable external interrupts on line EXTI_RTC_WAKEUP
#if defined(STM32L4) || defined(STM32WB)
EXTI->IMR1 |= 1 << EXTI_RTC_WAKEUP;
EXTI->RTSR1 |= 1 << EXTI_RTC_WAKEUP;
#elif defined(STM32H7)
EXTI_D1->IMR1 |= 1 << EXTI_RTC_WAKEUP;
EXTI->RTSR1 |= 1 << EXTI_RTC_WAKEUP;
#else
EXTI->IMR |= 1 << EXTI_RTC_WAKEUP;
EXTI->RTSR |= 1 << EXTI_RTC_WAKEUP;
#endif
// clear interrupt flags
RTC->ISR &= ~RTC_ISR_WUTF;
#if defined(STM32L4) || defined(STM32WB)
EXTI->PR1 = 1 << EXTI_RTC_WAKEUP;
#elif defined(STM32H7)
EXTI_D1->PR1 = 1 << EXTI_RTC_WAKEUP;
#else
EXTI->PR = 1 << EXTI_RTC_WAKEUP;
#endif
NVIC_SetPriority(RTC_WKUP_IRQn, IRQ_PRI_RTC_WKUP);
HAL_NVIC_EnableIRQ(RTC_WKUP_IRQn);
// printf("wut=%d wucksel=%d\n", wut, wucksel);
} else {
// clear WUTIE to disable interrupts
RTC->CR &= ~RTC_CR_WUTIE;
// enable register write protection
RTC->WPR = 0xff;
// disable external interrupts on line EXTI_RTC_WAKEUP
#if defined(STM32L4) || defined(STM32WB)
EXTI->IMR1 &= ~(1 << EXTI_RTC_WAKEUP);
#elif defined(STM32H7)
EXTI_D1->IMR1 |= 1 << EXTI_RTC_WAKEUP;
#else
EXTI->IMR &= ~(1 << EXTI_RTC_WAKEUP);
#endif
}
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(size_t n_args, const mp_obj_t *args) {
rtc_init_finalise();
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) {
#if defined(MICROPY_HW_RTC_USE_CALOUT) && MICROPY_HW_RTC_USE_CALOUT
if ((cal & 0xfffe) == 0x0ffe) {
// turn on/off X18 (PC13) 512Hz output
// Note:
// Output will stay active even in VBAT mode (and inrease current)
if (cal & 1) {
HAL_RTCEx_SetCalibrationOutPut(&RTCHandle, RTC_CALIBOUTPUT_512HZ);
} else {
HAL_RTCEx_DeactivateCalibrationOutPut(&RTCHandle);
}
return mp_obj_new_int(cal & 1);
} else {
mp_raise_ValueError(MP_ERROR_TEXT("calibration value out of range"));
}
#else
mp_raise_ValueError(MP_ERROR_TEXT("calibration value out of range"));
#endif
}
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_rom_map_elem_t pyb_rtc_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_init), MP_ROM_PTR(&pyb_rtc_init_obj) },
{ MP_ROM_QSTR(MP_QSTR_info), MP_ROM_PTR(&pyb_rtc_info_obj) },
{ MP_ROM_QSTR(MP_QSTR_datetime), MP_ROM_PTR(&pyb_rtc_datetime_obj) },
{ MP_ROM_QSTR(MP_QSTR_wakeup), MP_ROM_PTR(&pyb_rtc_wakeup_obj) },
{ MP_ROM_QSTR(MP_QSTR_calibration), MP_ROM_PTR(&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_dict_t *)&pyb_rtc_locals_dict,
};
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