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Jérôme Delacotte
2025-03-06 11:15:32 +01:00
commit 7b30d6e298
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85
libraries/AVR_Standard_C_Time_Library/src/AVR_RTC.h Normal file
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/*
* (C)2020 Phillip Stevens All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer. Redistributions in binary
* form must reproduce the above copyright notice, this list of conditions
* and the following disclaimer in the documentation and/or other materials
* provided with the distribution. Neither the name of the copyright holders
* nor the names of contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef AVR_RTC_H
#define AVR_RTC_H
#ifdef __cplusplus
extern "C" {
#endif
#include <time.h>
/**
The tm structure contains a representation of time 'broken down' into components of the
Gregorian calendar.
The normal ranges of the elements are..
\code
tm_sec seconds after the minute - [ 0 to 59 ]
tm_min minutes after the hour - [ 0 to 59 ]
tm_hour hours since midnight - [ 0 to 23 ]
tm_mday day of the month - [ 1 to 31 ]
tm_wday days since Sunday - [ 0 to 6 ]
tm_mon months since January - [ 0 to 11 ]
tm_year years since 2000
tm_yday days since January 1 - [ 0 to 365 ]
tm_isdst Daylight Saving Time flag *
\endcode
*The value of tm_isdst is zero if Daylight Saving Time is not in effect, and is negative if
the information is not available.
When Daylight Saving Time is in effect, the value represents the number of
seconds the clock is advanced.
*/
typedef struct tm tm;
/**
Convert a Y2K time stamp into a FAT file system time stamp.
*/
uint32_t system_fatfs(const struct tm * timeptr);
/**
Convert a FAT file system time stamp into a Y2K time stamp.
*/
uint32_t fatfs_system( uint16_t fsdate, uint16_t fstime, struct tm * timeptr);
/**
* Perform hardware setup to enable 1 second sys_tick() from RTC on Timer 2.
*/
void setup_RTC_interrupt( void );
#ifdef __cplusplus
}
#endif
#endif /* AVR_RTC_H */

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libraries/AVR_Standard_C_Time_Library/src/fatfs_time.c Normal file
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/*
* (C)2012 Michael Duane Rice All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer. Redistributions in binary
* form must reproduce the above copyright notice, this list of conditions
* and the following disclaimer in the documentation and/or other materials
* provided with the distribution. Neither the name of the copyright holders
* nor the names of contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/* $Id$ */
/*
Return a value suitable for use as a FAT file system time stamp.
*/
#include "AVR_RTC.h"
uint32_t
system_fatfs(const struct tm * timeptr)
{
uint32_t ret;
uint32_t n;
n = timeptr->tm_year - 80;
n <<= 25;
ret = n;
n = timeptr->tm_mon + 1;
n <<= 21;
ret |= n;
n = timeptr->tm_mday;
n <<= 16;
ret |= n;
n = timeptr->tm_hour;
n <<= 11;
ret |= n;
n = timeptr->tm_min;
n <<= 5;
ret |= n;
ret |= timeptr->tm_sec >> 1;
return ret;
}
/**
Convert a FAT file system time stamp into a Y2K time stamp.
wFatDate [in]
The MS-DOS date. The date is a packed value with the following format.
Bits Description
0-4 Day of the month (1–31)
5-8 Month (1 = January, 2 = February, and so on)
9-15 Year offset from 1980, subtract 20 to get Y2K year, add 2000 for Gregorian year.
wFatTime [in]
The MS-DOS time. The time is a packed value with the following format.
Bits Description
0-4 Second divided by 2
5-10 Minute (0–59)
11-15 Hour (0–23 on a 24-hour clock)
*/
uint32_t
fatfs_system( uint16_t fsdate, uint16_t fstime, struct tm * timeptr)
{
timeptr->tm_year = ((fsdate >> 9) & 0x007F) + 80;
timeptr->tm_mon = ((uint8_t)(fsdate >> 5 ) & 0x0F) - 1;
timeptr->tm_mday = (uint8_t) fsdate & 0x1F;
timeptr->tm_hour = (uint8_t)(fstime >> 11) & 0x1F;
timeptr->tm_min = (uint8_t)(fstime >> 5) & 0x3F;
timeptr->tm_sec = ((uint8_t) fstime & 0x001F) << 1;
return mktime( timeptr );
}

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libraries/AVR_Standard_C_Time_Library/src/timer2.c Normal file
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/*
Set up the RTC based on using the AVR Timer 2 attached Clock Crystal.
Developed for the Goldilocks Analogue, but also relevant for the Arduino Mega
*/
#include <stdlib.h>
#include <util/atomic.h>
#include <avr/interrupt.h>
#include "AVR_RTC.h"
void
setup_RTC_interrupt( void )
{
/* Using 8bit Timer2 to generate the tick.
* A 32.768 KHz crystal must be attached to the appropriate pins.
* We then adjust the scale factor and counter to roll over at the top
* so we can get EXACT seconds for the Real Time clock.
*
* This code is correct for an ATmega328p (Arduino Uno) but will fail to function
* because the pins are used for an external crystal.
*/
ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
{
TIMSK2 &= ~( _BV(OCIE2B)|_BV(OCIE2A)|_BV(TOIE2) ); // disable all Timer2 interrupts
TIFR2 |= _BV(OCF2B)|_BV(OCF2A)|_BV(TOV2); // clear all pending interrupts
ASSR = _BV(AS2); // set Timer/Counter2 to be asynchronous from the CPU clock
// with a second external clock (32,768kHz) driving it.
TCNT2 = 0x00; // zero out the counter
TCCR2A = 0x00; // Normal mode
TCCR2B = _BV(CS22) | _BV(CS20); // divide timer clock by 128 so counter will roll over at MAX
while( ASSR & (_BV(TCN2UB)|_BV(OCR2AUB)|_BV(TCR2AUB))); // Wait until Timer2 update complete
/* Enable the interrupt - this is okay as interrupts are currently globally disabled. */
TIMSK2 |= _BV(TOIE2); // When the TOIE2 bit is written to one, the interrupt is enabled
}
}
/*
* Tick ISR for the RTC. All this does is increment the RTC tick count, once per second.
* Use ISR_NOBLOCK where there is an important timer running, that should preempt the RTC.
* As long as it completes within one second, then there is no issue.
*/
ISR(TIMER2_OVF_vect, ISR_NAKED ISR_NOBLOCK ) __attribute__ ((hot, flatten));
ISR(TIMER2_OVF_vect)
{
system_tick();
reti();
}