Seeeduino XIAO (ATSAMD21G18) のRTCライブラリ

最近、毎日何か作ってるような気もするが今度はＲＴＣライブラリを作って見た。モード２専用ではあるがモード０でもほぼ同じことができそう。でも、毎分とか毎時とか毎日とか毎月とか毎年とかのカレンダーでアラーム設定できるのはモード２だけだ。

ＲＴＣの年の値は0-63であるため、基準年を1900年にすると1963年までしか対応できないので基準年を2000年とした。これで2000-2063年まで対応できる。

C言語ランタイムのtime_t型は64-bit型になっているようなので2038年問題はないが2063年問題は残ることになる。が、若い人は別にしてあと43年も対応できれば十分だろう。

ちなみにデバッグ中にクロック・レジスタのリードに毎回1ms前後の時間がかかることを発見。それを解決するのに少々手間取ってしまった。リード同期がとれていない状態でクロック・レジスタをリードしてしまうとリード同期がとれるまでＣＰＵが止まってしまうらしい。リード・リクエスト(RREQ)とリード・コンティニュー(RCONT)を同時設定することでリード同期が完璧に決まる。一度、同期が取れればＣＰＵが止まることはないようだ。

【概要】

bool begin(bool clearOnMatch = false)

1	bool begin(bool clearOnMatch = false)

ライブラリを初期化する。

void end(void)

1	void end(void)

ライブラリを終了する。

void interrupt(RTCLOCK_CALLBACK cb)

1	void interrupt(RTCLOCK_CALLBACK cb)

割り込みを設定する。

EVENTSYS_GEN eventOutput(RTCLOCK_EVOSEL evsel, bool enable)

1	EVENTSYS_GEN eventOutput(RTCLOCK_EVOSEL evsel, bool enable)

イベント出力の設定をする。

void frequencyCorrection(int8_t value)

1	void frequencyCorrection(int8_t value)

ＲＴＣクロック(1.024KHz)の999424クロック毎の補正量を符号付で指定する。

void debugControl(bool dbgrun)

1	void debugControl(bool dbgrun)

デバッグ中の動作を設定する。

time_t time(void)

1	time_t time(void)

時刻を取得する。Ｃ言語のtime()と互換で1900/1/1からの秒数を返す。

void update(time_t time)

1	void update(time_t time)

時刻を設定する。

void alarm(RTCLOCK_ALARM mask, time_t time = 0)

1	void alarm(RTCLOCK_ALARM mask, time_t time = 0)

アラームを設定する。

【サンプルスケッチ】

#include “rtclock.h”

void setup()
{
  struct tm now;
  now.tm_sec  = 0;
  now.tm_min  = 0;
  now.tm_hour = 0;
  now.tm_mday = 1;
  now.tm_mon  = 1 - 1;
  now.tm_year = 2020 - 1900;
  RTClock::begin();
  RTClock::update(mktime(&now));
}

void loop()
{
  RTClock::time();
}

#include “rtclock.h”

void setup()

{

struct tm now;

now.tm_sec = 0;

now.tm_min = 0;

now.tm_hour = 0;

now.tm_mday = 1;

now.tm_mon = 1 - 1;

now.tm_year = 2020 - 1900;

RTClock::begin();

RTClock::update(mktime(&now));

}

void loop()

{

RTClock::time();

}

【修正】
2020-05-24
evetsys.hのインクルードとRTCLOCK_EVOSEL型を追加。eventOutput()を仕様変更しEVENTSYS_GEN型を返すように変更。

【ライブラリ】

/*
  rtclock.h - Real Time Clock Library for Microchip ATSAMD21 (Cortex®-M0+)

  Copyright (c) 2020 Sasapea's Lab. All right reserved.

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/
#ifndef __RTCLOCK_H
#define __RTCLOCK_H

#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <time.h>
#include "gclock.h"
#include "eventsys.h"

typedef enum
{
  RTCLOCK_EVOSEL_PER_0,
  RTCLOCK_EVOSEL_PER_1,
  RTCLOCK_EVOSEL_PER_2,
  RTCLOCK_EVOSEL_PER_3,
  RTCLOCK_EVOSEL_PER_4,
  RTCLOCK_EVOSEL_PER_5,
  RTCLOCK_EVOSEL_PER_6,
  RTCLOCK_EVOSEL_PER_7,
  RTCLOCK_EVOSEL_OVF,
  RTCLOCK_EVOSEL_ALARM,
} RTCLOCK_EVOSEL;

typedef enum
{
  RTCLOCK_ALARM_DISABLE      = 0x0, // Alarm Disabled
  RTCLOCK_ALARM_SS           = 0x1, // Match seconds only
  RTCLOCK_ALARM_MMSS         = 0x2, // Match seconds and minutes only
  RTCLOCK_ALARM_HHMMSS       = 0x3, // Match seconds, minutes, and hours only
  RTCLOCK_ALARM_DDHHMMSS     = 0x4, // Match seconds, minutes, hours, and days only
  RTCLOCK_ALARM_MMDDHHMMSS   = 0x5, // Match seconds, minutes, hours, days, and months only
  RTCLOCK_ALARM_YYMMDDHHMMSS = 0x6, // Match seconds, minutes, hours, days, months, and years
} RTCLOCK_ALARM;

typedef enum
{
  RTCLOCK_INT_ALARM,
  RTCLOCK_INT_OVF,
} RTCLOCK_INT;

typedef void (*RTCLOCK_CALLBACK)(RTCLOCK_INT);

class RTClock
{
  private:

    static void setCallback(RTCLOCK_CALLBACK cb);

    static void sync(void)
    {
      while (RTC->MODE2.CTRL.bit.SWRST || RTC->MODE2.STATUS.bit.SYNCBUSY)
        continue;
    }

    static bool enableGCLK(void)
    {
      // GCLK = 32.768KHz / (1 << (4 + 1)) = 1.024KHz
      GCLOCK_GEN gen = GClock::config(GCLOCK_SRC_XOSC32K, 4, true);
      if (gen == GCLOCK_GEN_NONE)
        return false;
      GClock::select(GCLOCK_ID_RTC, gen);
      GClock::control(GCLOCK_ID_RTC, true);
      return true;
    }

  public:

    static bool begin(bool clearOnMatch = false)
    {
      if (!enableGCLK())
        return false;
      RTC->MODE2.CTRL.reg = RTC_MODE2_CTRL_SWRST;
      sync();
      RTC->MODE2.CTRL.reg = RTC_MODE2_CTRL_ENABLE
        | RTC_MODE2_CTRL_MODE_CLOCK
        | (clearOnMatch ? RTC_MODE2_CTRL_MATCHCLR : 0)
        | RTC_MODE2_CTRL_PRESCALER_DIV1024;
      sync();
      NVIC_EnableIRQ(RTC_IRQn);
      NVIC_SetPriority(RTC_IRQn, 0);
      RTC->MODE2.READREQ.reg = RTC_READREQ_RREQ | RTC_READREQ_RCONT;
      sync();
      return true;
    }

    static void end(void)
    {
      if (RTC->MODE2.CTRL.bit.ENABLE)
      {
        NVIC_DisableIRQ(RTC_IRQn);
        RTC->MODE2.CTRL.reg = RTC_MODE0_CTRL_SWRST;
        sync();
        GClock::control(GCLOCK_ID_RTC, false);
      }
    }

    static void interrupt(RTCLOCK_CALLBACK cb)
    {
      setCallback(cb);
      if (cb)
        RTC->MODE2.INTENSET.reg = RTC_MODE2_INTENSET_ALARM0 | RTC_MODE2_INTENSET_OVF;
      else
        RTC->MODE2.INTENCLR.reg = RTC_MODE2_INTENCLR_ALARM0 | RTC_MODE2_INTENCLR_OVF;
    }

    static EVENTSYS_GEN eventOutput(RTCLOCK_EVOSEL evsel, bool enable)
    {
      switch (evsel)
      {
        case RTCLOCK_EVOSEL_PER_0: RTC->MODE2.EVCTRL.bit.PEREO0   = enable; return EVENTSYS_GEN_RTC_PER_0;
        case RTCLOCK_EVOSEL_PER_1: RTC->MODE2.EVCTRL.bit.PEREO1   = enable; return EVENTSYS_GEN_RTC_PER_1;
        case RTCLOCK_EVOSEL_PER_2: RTC->MODE2.EVCTRL.bit.PEREO2   = enable; return EVENTSYS_GEN_RTC_PER_2;
        case RTCLOCK_EVOSEL_PER_3: RTC->MODE2.EVCTRL.bit.PEREO3   = enable; return EVENTSYS_GEN_RTC_PER_3;
        case RTCLOCK_EVOSEL_PER_4: RTC->MODE2.EVCTRL.bit.PEREO4   = enable; return EVENTSYS_GEN_RTC_PER_4;
        case RTCLOCK_EVOSEL_PER_5: RTC->MODE2.EVCTRL.bit.PEREO5   = enable; return EVENTSYS_GEN_RTC_PER_5;
        case RTCLOCK_EVOSEL_PER_6: RTC->MODE2.EVCTRL.bit.PEREO6   = enable; return EVENTSYS_GEN_RTC_PER_6;
        case RTCLOCK_EVOSEL_PER_7: RTC->MODE2.EVCTRL.bit.PEREO7   = enable; return EVENTSYS_GEN_RTC_PER_7;
        case RTCLOCK_EVOSEL_OVF  : RTC->MODE2.EVCTRL.bit.OVFEO    = enable; return EVENTSYS_GEN_RTC_OVF;
        case RTCLOCK_EVOSEL_ALARM: RTC->MODE2.EVCTRL.bit.ALARMEO0 = enable; return EVENTSYS_GEN_RTC_CMP_0;
      }
      return EVENTSYS_GEN_NONE;
    }

    static void debugControl(bool dbgrun)
    {
      RTC->MODE2.DBGCTRL.reg = (dbgrun ? RTC_DBGCTRL_DBGRUN : 0);
    }

    static void frequencyCorrection(int8_t value)
    {
      RTC->MODE2.FREQCORR.reg = value;
      sync();
    }

    static time_t time(void)
    {
      RTC_MODE2_CLOCK_Type c;
      struct tm t;
      memset(&t, 0, sizeof(t));
      c.reg = RTC->MODE2.CLOCK.reg;
      t.tm_sec  = c.bit.SECOND;
      t.tm_min  = c.bit.MINUTE;
      t.tm_hour = c.bit.HOUR;
      t.tm_mday = c.bit.DAY;
      t.tm_mon  = c.bit.MONTH - 1;
      t.tm_year = c.bit.YEAR + 100;
      return mktime(&t);
    }

    static void update(time_t time)
    {
      RTC_MODE2_CLOCK_Type c;
      struct tm t;
      localtime_r(&time, &t);
      c.bit.SECOND = t.tm_sec;
      c.bit.MINUTE = t.tm_min;
      c.bit.HOUR   = t.tm_hour;
      c.bit.DAY    = t.tm_mday;
      c.bit.MONTH  = t.tm_mon + 1;
      c.bit.YEAR   = t.tm_year % 100;
      RTC->MODE2.CLOCK.reg = c.reg;
      sync();
      RTC->MODE2.READREQ.reg = RTC_READREQ_RREQ | RTC_READREQ_RCONT;
      sync();
    }

    static void alarm(RTCLOCK_ALARM mask, time_t time = 0)
    {
      if (mask != RTCLOCK_ALARM_DISABLE)
      {
        RTC_MODE2_ALARM_Type c;
        struct tm t;
        localtime_r(&time, &t);
        c.bit.SECOND = t.tm_sec;
        c.bit.MINUTE = t.tm_min;
        c.bit.HOUR   = t.tm_hour;
        c.bit.DAY    = t.tm_mday;
        c.bit.MONTH  = t.tm_mon + 1;
        c.bit.YEAR   = t.tm_year % 100;
        RTC->MODE2.Mode2Alarm[0].ALARM.reg = c.reg;
        sync();
      }
      RTC->MODE2.Mode2Alarm[0].MASK.reg = RTC_MODE2_MASK_SEL(mask);
      sync();
    }
};

#endif

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rtclock.h - Real Time Clock Library for Microchip ATSAMD21 (Cortex®-M0+)

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Lesser General Public

License as published by the Free Software Foundation; either

version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public

License along with this library; if not, write to the Free Software

Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

#ifndef __RTCLOCK_H

#define __RTCLOCK_H

#include <stdint.h>

#include <stdbool.h>

#include <string.h>

#include <time.h>

#include "gclock.h"

#include "eventsys.h"

typedef enum

{

RTCLOCK_EVOSEL_PER_0,

RTCLOCK_EVOSEL_PER_1,

RTCLOCK_EVOSEL_PER_2,

RTCLOCK_EVOSEL_PER_3,

RTCLOCK_EVOSEL_PER_4,

RTCLOCK_EVOSEL_PER_5,

RTCLOCK_EVOSEL_PER_6,

RTCLOCK_EVOSEL_PER_7,

RTCLOCK_EVOSEL_OVF,

RTCLOCK_EVOSEL_ALARM,

} RTCLOCK_EVOSEL;

typedef enum

{

RTCLOCK_ALARM_DISABLE = 0x0, // Alarm Disabled

RTCLOCK_ALARM_SS = 0x1, // Match seconds only

RTCLOCK_ALARM_MMSS = 0x2, // Match seconds and minutes only

RTCLOCK_ALARM_HHMMSS = 0x3, // Match seconds, minutes, and hours only

RTCLOCK_ALARM_DDHHMMSS = 0x4, // Match seconds, minutes, hours, and days only

RTCLOCK_ALARM_MMDDHHMMSS = 0x5, // Match seconds, minutes, hours, days, and months only

RTCLOCK_ALARM_YYMMDDHHMMSS = 0x6, // Match seconds, minutes, hours, days, months, and years

} RTCLOCK_ALARM;

typedef enum

{

RTCLOCK_INT_ALARM,

RTCLOCK_INT_OVF,

} RTCLOCK_INT;

typedef void (*RTCLOCK_CALLBACK)(RTCLOCK_INT);

class RTClock

{

private:

static void setCallback(RTCLOCK_CALLBACK cb);

static void sync(void)

{

while (RTC->MODE2.CTRL.bit.SWRST || RTC->MODE2.STATUS.bit.SYNCBUSY)

continue;

}

static bool enableGCLK(void)

{

// GCLK = 32.768KHz / (1 << (4 + 1)) = 1.024KHz

GCLOCK_GEN gen = GClock::config(GCLOCK_SRC_XOSC32K, 4, true);

if (gen == GCLOCK_GEN_NONE)

return false;

GClock::select(GCLOCK_ID_RTC, gen);

GClock::control(GCLOCK_ID_RTC, true);

return true;

}

public:

static bool begin(bool clearOnMatch = false)

{

if (!enableGCLK())

return false;

RTC->MODE2.CTRL.reg = RTC_MODE2_CTRL_SWRST;

sync();

RTC->MODE2.CTRL.reg = RTC_MODE2_CTRL_ENABLE

| RTC_MODE2_CTRL_MODE_CLOCK

| (clearOnMatch ? RTC_MODE2_CTRL_MATCHCLR : 0)

| RTC_MODE2_CTRL_PRESCALER_DIV1024;

sync();

NVIC_EnableIRQ(RTC_IRQn);

NVIC_SetPriority(RTC_IRQn, 0);

RTC->MODE2.READREQ.reg = RTC_READREQ_RREQ | RTC_READREQ_RCONT;

sync();

return true;

}

static void end(void)

{

if (RTC->MODE2.CTRL.bit.ENABLE)

{

NVIC_DisableIRQ(RTC_IRQn);

RTC->MODE2.CTRL.reg = RTC_MODE0_CTRL_SWRST;

sync();

GClock::control(GCLOCK_ID_RTC, false);

}

static void interrupt(RTCLOCK_CALLBACK cb)

{

setCallback(cb);

if (cb)

RTC->MODE2.INTENSET.reg = RTC_MODE2_INTENSET_ALARM0 | RTC_MODE2_INTENSET_OVF;

else

RTC->MODE2.INTENCLR.reg = RTC_MODE2_INTENCLR_ALARM0 | RTC_MODE2_INTENCLR_OVF;

}

static EVENTSYS_GEN eventOutput(RTCLOCK_EVOSEL evsel, bool enable)

{

switch (evsel)

{

case RTCLOCK_EVOSEL_PER_0: RTC->MODE2.EVCTRL.bit.PEREO0 = enable; return EVENTSYS_GEN_RTC_PER_0;

case RTCLOCK_EVOSEL_PER_1: RTC->MODE2.EVCTRL.bit.PEREO1 = enable; return EVENTSYS_GEN_RTC_PER_1;

case RTCLOCK_EVOSEL_PER_2: RTC->MODE2.EVCTRL.bit.PEREO2 = enable; return EVENTSYS_GEN_RTC_PER_2;

case RTCLOCK_EVOSEL_PER_3: RTC->MODE2.EVCTRL.bit.PEREO3 = enable; return EVENTSYS_GEN_RTC_PER_3;

case RTCLOCK_EVOSEL_PER_4: RTC->MODE2.EVCTRL.bit.PEREO4 = enable; return EVENTSYS_GEN_RTC_PER_4;

case RTCLOCK_EVOSEL_PER_5: RTC->MODE2.EVCTRL.bit.PEREO5 = enable; return EVENTSYS_GEN_RTC_PER_5;

case RTCLOCK_EVOSEL_PER_6: RTC->MODE2.EVCTRL.bit.PEREO6 = enable; return EVENTSYS_GEN_RTC_PER_6;

case RTCLOCK_EVOSEL_PER_7: RTC->MODE2.EVCTRL.bit.PEREO7 = enable; return EVENTSYS_GEN_RTC_PER_7;

case RTCLOCK_EVOSEL_OVF : RTC->MODE2.EVCTRL.bit.OVFEO = enable; return EVENTSYS_GEN_RTC_OVF;

case RTCLOCK_EVOSEL_ALARM: RTC->MODE2.EVCTRL.bit.ALARMEO0 = enable; return EVENTSYS_GEN_RTC_CMP_0;

}

return EVENTSYS_GEN_NONE;

}

static void debugControl(bool dbgrun)

{

RTC->MODE2.DBGCTRL.reg = (dbgrun ? RTC_DBGCTRL_DBGRUN : 0);

}

static void frequencyCorrection(int8_t value)

{

RTC->MODE2.FREQCORR.reg = value;

sync();

}

static time_t time(void)

{

RTC_MODE2_CLOCK_Type c;

struct tm t;

memset(&t, 0, sizeof(t));

c.reg = RTC->MODE2.CLOCK.reg;

t.tm_sec = c.bit.SECOND;

t.tm_min = c.bit.MINUTE;

t.tm_hour = c.bit.HOUR;

t.tm_mday = c.bit.DAY;

t.tm_mon = c.bit.MONTH - 1;

t.tm_year = c.bit.YEAR + 100;

return mktime(&t);

}

static void update(time_t time)

{

RTC_MODE2_CLOCK_Type c;

struct tm t;

localtime_r(&time, &t);

c.bit.SECOND = t.tm_sec;

c.bit.MINUTE = t.tm_min;

c.bit.HOUR = t.tm_hour;

c.bit.DAY = t.tm_mday;

c.bit.MONTH = t.tm_mon + 1;

c.bit.YEAR = t.tm_year % 100;

RTC->MODE2.CLOCK.reg = c.reg;

sync();

RTC->MODE2.READREQ.reg = RTC_READREQ_RREQ | RTC_READREQ_RCONT;

sync();

}

static void alarm(RTCLOCK_ALARM mask, time_t time = 0)

{

if (mask != RTCLOCK_ALARM_DISABLE)

{

RTC_MODE2_ALARM_Type c;

struct tm t;

localtime_r(&time, &t);

c.bit.SECOND = t.tm_sec;

c.bit.MINUTE = t.tm_min;

c.bit.HOUR = t.tm_hour;

c.bit.DAY = t.tm_mday;

c.bit.MONTH = t.tm_mon + 1;

c.bit.YEAR = t.tm_year % 100;

RTC->MODE2.Mode2Alarm[0].ALARM.reg = c.reg;

sync();

}

RTC->MODE2.Mode2Alarm[0].MASK.reg = RTC_MODE2_MASK_SEL(mask);

sync();

}

};

#endif

/*
  rtclock.cpp - Real Time Clock Library for Microchip ATSAMD21 (Cortex®-M0+)

  Copyright (c) 2020 Sasapea's Lab. All right reserved.

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/
#include "rtclock.h"

static RTCLOCK_CALLBACK _callback;

void RTC_Handler(void)
{
  if (RTC->MODE2.INTFLAG.bit.ALARM0)
  {
    RTC->MODE2.INTFLAG.bit.ALARM0 = 1;
    if (_callback)
      _callback(RTCLOCK_INT_ALARM);      
  }
  if (RTC->MODE2.INTFLAG.bit.OVF)
  {
    RTC->MODE2.INTFLAG.bit.OVF = 1;
    if (_callback)
      _callback(RTCLOCK_INT_OVF);      
  }
}

void RTClock::setCallback(RTCLOCK_CALLBACK cb)
{
  _callback = cb;
}

rtclock.cpp - Real Time Clock Library for Microchip ATSAMD21 (Cortex®-M0+)

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Lesser General Public

License as published by the Free Software Foundation; either

version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public

License along with this library; if not, write to the Free Software

Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

#include "rtclock.h"

static RTCLOCK_CALLBACK _callback;

void RTC_Handler(void)

{

if (RTC->MODE2.INTFLAG.bit.ALARM0)

{

RTC->MODE2.INTFLAG.bit.ALARM0 = 1;

if (_callback)

_callback(RTCLOCK_INT_ALARM);

}

if (RTC->MODE2.INTFLAG.bit.OVF)

{

RTC->MODE2.INTFLAG.bit.OVF = 1;

if (_callback)

_callback(RTCLOCK_INT_OVF);

}

void RTClock::setCallback(RTCLOCK_CALLBACK cb)

{

_callback = cb;

}

【参照ライブラリ】
Seeeduino XIAO (ATSAMD21G18) のGCLKライブラリ (gclock.h/gclock.cpp)
Seeeduino XIAO (ATSAMD21G18) のEVSYSライブラリ (eventsys.h/eventsys.cpp)

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