micropython/stmhal/rtc.c

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#include <stdio.h>
#include "stm32f4xx_hal.h"
#include "misc.h"
#include "mpconfig.h"
#include "qstr.h"
#include "obj.h"
#include "runtime.h"
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#include "rtc.h"
/// \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;
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// rtc_info indicates various things about RTC startup
// it's a bit of a hack at the moment
static machine_uint_t rtc_info;
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// Note: LSI is around (32KHz), these dividers should work either way
// ck_spre(1Hz) = RTCCLK(LSE) /(uwAsynchPrediv + 1)*(uwSynchPrediv + 1)
#define RTC_ASYNCH_PREDIV (0x7f)
#define RTC_SYNCH_PREDIV (0x00ff)
#if 0
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#define RTC_INFO_USE_EXISTING (0)
#define RTC_INFO_USE_LSE (1)
#define RTC_INFO_USE_LSI (3)
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void rtc_init(void) {
// Enable the PWR clock
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
// Allow access to RTC
PWR_BackupAccessCmd(ENABLE);
if (RTC_ReadBackupRegister(RTC_BKP_DR0) == 0x32F2) {
// RTC still alive, so don't re-init it
// wait for RTC APB register synchronisation
RTC_WaitForSynchro();
rtc_info = RTC_INFO_USE_EXISTING;
return;
}
uint32_t timeout = 10000000;
// Enable the PWR clock
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
// Allow access to RTC
PWR_BackupAccessCmd(ENABLE);
// Enable the LSE OSC
RCC_LSEConfig(RCC_LSE_ON);
// Wait till LSE is ready
machine_uint_t sys_tick = sys_tick_counter;
while((RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET) && (--timeout > 0)) {
}
// record how long it took for the RTC to start up
rtc_info = (sys_tick_counter - sys_tick) << 2;
// If LSE timed out, use LSI instead
if (timeout == 0) {
// Disable the LSE OSC
RCC_LSEConfig(RCC_LSE_OFF);
// Enable the LSI OSC
RCC_LSICmd(ENABLE);
// Wait till LSI is ready
while(RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) {
}
// Use LSI as the RTC Clock Source
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);
// record that we are using the LSI
rtc_info |= RTC_INFO_USE_LSI;
} else {
// Use LSE as the RTC Clock Source
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
// record that we are using the LSE
rtc_info |= RTC_INFO_USE_LSE;
}
// Note: LSI is around (32KHz), these dividers should work either way
// ck_spre(1Hz) = RTCCLK(LSE) /(uwAsynchPrediv + 1)*(uwSynchPrediv + 1)
uint32_t uwSynchPrediv = 0xFF;
uint32_t uwAsynchPrediv = 0x7F;
// Enable the RTC Clock
RCC_RTCCLKCmd(ENABLE);
// Wait for RTC APB registers synchronisation
RTC_WaitForSynchro();
// Configure the RTC data register and RTC prescaler
RTC_InitTypeDef RTC_InitStructure;
RTC_InitStructure.RTC_AsynchPrediv = uwAsynchPrediv;
RTC_InitStructure.RTC_SynchPrediv = uwSynchPrediv;
RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;
RTC_Init(&RTC_InitStructure);
// Set the date (BCD)
RTC_DateTypeDef RTC_DateStructure;
RTC_DateStructure.RTC_Year = 0x13;
RTC_DateStructure.RTC_Month = RTC_Month_October;
RTC_DateStructure.RTC_Date = 0x26;
RTC_DateStructure.RTC_WeekDay = RTC_Weekday_Saturday;
RTC_SetDate(RTC_Format_BCD, &RTC_DateStructure);
// Set the time (BCD)
RTC_TimeTypeDef RTC_TimeStructure;
RTC_TimeStructure.RTC_H12 = RTC_H12_AM;
RTC_TimeStructure.RTC_Hours = 0x01;
RTC_TimeStructure.RTC_Minutes = 0x53;
RTC_TimeStructure.RTC_Seconds = 0x00;
RTC_SetTime(RTC_Format_BCD, &RTC_TimeStructure);
// Indicator for the RTC configuration
RTC_WriteBackupRegister(RTC_BKP_DR0, 0x32F2);
}
#endif
static void RTC_CalendarConfig(void);
void rtc_init(void) {
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RTCHandle.Instance = RTC;
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/* Configure RTC prescaler and RTC data registers */
/* RTC configured as follow:
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- Hour Format = Format 24
- Asynch Prediv = Value according to source clock
- Synch Prediv = Value according to source clock
- OutPut = Output Disable
- OutPutPolarity = High Polarity
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- 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;
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machine_uint_t tick = HAL_GetTick();
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if (HAL_RTC_Init(&RTCHandle) != HAL_OK) {
// init error
rtc_info = 0xffff; // indicate error
return;
}
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// record how long it took for the RTC to start up
rtc_info = HAL_GetTick() - tick;
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// check data stored in BackUp register0
if (HAL_RTCEx_BKUPRead(&RTCHandle, RTC_BKP_DR0) != 0x32f2) {
// fresh reset; configure RTC Calendar
RTC_CalendarConfig();
} else {
// RTC was previously set, so leave it alone
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if(__HAL_RCC_GET_FLAG(RCC_FLAG_PORRST) != RESET) {
// power on reset occurred
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rtc_info |= 0x10000;
}
if(__HAL_RCC_GET_FLAG(RCC_FLAG_PINRST) != RESET) {
// external reset occurred
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rtc_info |= 0x20000;
}
// Clear source Reset Flag
__HAL_RCC_CLEAR_RESET_FLAGS();
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}
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}
static void RTC_CalendarConfig(void) {
// set the date to 1st Jan 2014
RTC_DateTypeDef date;
date.Year = 0x14;
date.Month = RTC_MONTH_JANUARY;
date.Date = 0x01;
date.WeekDay = RTC_WEEKDAY_WEDNESDAY;
if(HAL_RTC_SetDate(&RTCHandle, &date, FORMAT_BCD) != HAL_OK) {
// init error
return;
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}
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// set the time to 00:00:00
RTC_TimeTypeDef time;
time.Hours = 0x00;
time.Minutes = 0x00;
time.Seconds = 0x00;
time.TimeFormat = RTC_HOURFORMAT12_AM;
time.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
time.StoreOperation = RTC_STOREOPERATION_RESET;
if (HAL_RTC_SetTime(&RTCHandle, &time, FORMAT_BCD) != HAL_OK) {
// init error
return;
}
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// write data to indicate the RTC has been set
HAL_RTCEx_BKUPWrite(&RTCHandle, RTC_BKP_DR0, 0x32f2);
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}
/******************************************************************************/
// Micro Python bindings
typedef struct _pyb_rtc_obj_t {
mp_obj_base_t base;
} 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()
/// Create an RTC object.
STATIC mp_obj_t pyb_rtc_make_new(mp_obj_t type_in, uint n_args, uint 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_t)&pyb_rtc_obj;
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}
/// \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.
///
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/// `subseconds` is a free-running timer and counts down from 255 to 0, rolls around many times a second.
mp_obj_t pyb_rtc_datetime(uint n_args, const mp_obj_t *args) {
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, FORMAT_BIN);
HAL_RTC_GetDate(&RTCHandle, &date, 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(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, FORMAT_BCD);
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.SubSeconds = mp_obj_get_int(items[7]);
time.TimeFormat = RTC_HOURFORMAT12_AM;
time.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
time.StoreOperation = RTC_STOREOPERATION_SET;
HAL_RTC_SetTime(&RTCHandle, &time, FORMAT_BCD);
return mp_const_none;
}
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_rtc_datetime_obj, 1, 2, pyb_rtc_datetime);
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 },
};
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,
};