ＲＴＣの機能により起動時からの経過時間や任意時間によるインターバル割込み及び定期的な周期割込みを管理できるライブラリ。ＲＴＣは低消費電力処理用途には向いているが低分解能(約30.5us)である。
ちなみにAVR0/1以外ならcalib()で誤差補正が可能。
RTCを使うには、
[avr8_config.h] #define CONFIG_RTC_USE 1
の設定が必要となる。
【サンプルコード (Microchip Studio)】
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#include "avr8_rtc.h" void func1(void) { /* 100ms RTC interrupt */ } void func2(void) { /* 250ms PIT interrupt */ } void func3(void) { /* 500ms interval */ } int main() { /* Enable Interrupt */ sei(); /* RTC初期化 */ Rtc::begin(); /* 任意割込み設定 (RTC) */ Rtc::callback(func1); Rtc::interrupt(RTC_US2TICK(100000)); /* 周期割込み設定 (PIT) */ Rtc::callbackPIT(func2); Rtc::interruptPIT(Rtc::PERIOD_CYC8192); /* RTC起動 */ Rtc::run(); /* メイン・ループ */ uint32_t t = Rtc::read(); while (1) { while (Rtc::read() - t < RTC_US2TICK(500000)) continue; t += RTC_US2TICK(500000); func3(); } } |
【ライブラリ】
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/* avr8_rtc.h - RTC Driver for Microchip AVR8 Series Copyright (c) 2025 Sasapea's Lab. All right reserved. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or at your option) any later version. This program 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>. */ #pragma once #include "avr8_config.h" #include "avr8_rtc_dfp.h" #if CONFIG_RTC_USE #define RTC_HZ2TICK(f) (32768UL / (f)) /* must be PRESCALER_DIV1 */ #define RTC_US2TICK(t) ((uint64_t)(t) * 512 / 15625) /* must be PRESCALER_DIV1 */ #define RTC_TICK2US(c) ((uint64_t)(c) * 15625 / 512) /* must be PRESCALER_DIV1 */ class Rtc { public: /* RTC Clock Select select */ typedef enum RTC_CLKSEL_enum { #if defined(CLKCTRL_OSCHFCTRLA) CLKSEL_OSC32K = RTC_CLKSEL_OSC32K_gc, /* 32.768 kHz from OSC32K */ CLKSEL_OSC1K = RTC_CLKSEL_OSC1K_gc, /* 1.024 kHz from OSC32K */ CLKSEL_XOSC32K = RTC_CLKSEL_XOSC32K_gc, /* 32.768 kHz from XOSC32K */ CLKSEL_EXTCLK = RTC_CLKSEL_EXTCLK_gc, /* External Clock */ #else CLKSEL_OSC32K = RTC_CLKSEL_INT32K_gc, /* Internal 32kHz OSC */ CLKSEL_OSC1K = RTC_CLKSEL_INT1K_gc, /* Internal 1kHz OSC */ CLKSEL_EXTCLK = RTC_CLKSEL_EXTCLK_gc, /* External Clock */ #endif } CLKSEL; /* RTC Prescaling Factor select */ typedef enum { PRESCALER_DIV1 = RTC_PRESCALER_DIV1_gc, /* RTC Clock / 1 */ PRESCALER_DIV2 = RTC_PRESCALER_DIV2_gc, /* RTC Clock / 2 */ PRESCALER_DIV4 = RTC_PRESCALER_DIV4_gc, /* RTC Clock / 4 */ PRESCALER_DIV8 = RTC_PRESCALER_DIV8_gc, /* RTC Clock / 8 */ PRESCALER_DIV16 = RTC_PRESCALER_DIV16_gc, /* RTC Clock / 16 */ PRESCALER_DIV32 = RTC_PRESCALER_DIV32_gc, /* RTC Clock / 32 */ PRESCALER_DIV64 = RTC_PRESCALER_DIV64_gc, /* RTC Clock / 64 */ PRESCALER_DIV128 = RTC_PRESCALER_DIV128_gc, /* RTC Clock / 128 */ PRESCALER_DIV256 = RTC_PRESCALER_DIV256_gc, /* RTC Clock / 256 */ PRESCALER_DIV512 = RTC_PRESCALER_DIV512_gc, /* RTC Clock / 512 */ PRESCALER_DIV1024 = RTC_PRESCALER_DIV1024_gc, /* RTC Clock / 1024 */ PRESCALER_DIV2048 = RTC_PRESCALER_DIV2048_gc, /* RTC Clock / 2048 */ PRESCALER_DIV4096 = RTC_PRESCALER_DIV4096_gc, /* RTC Clock / 4096 */ PRESCALER_DIV8192 = RTC_PRESCALER_DIV8192_gc, /* RTC Clock / 8192 */ PRESCALER_DIV16384 = RTC_PRESCALER_DIV16384_gc, /* RTC Clock / 16384 */ PRESCALER_DIV32768 = RTC_PRESCALER_DIV32768_gc, /* RTC Clock / 32768 */ } PRESCALER; /* PIT Period select */ typedef enum { PERIOD_OFF = RTC_PERIOD_OFF_gc, /* Off */ PERIOD_CYC4 = RTC_PERIOD_CYC4_gc, /* RTC Clock Cycles 4 */ PERIOD_CYC8 = RTC_PERIOD_CYC8_gc, /* RTC Clock Cycles 8 */ PERIOD_CYC16 = RTC_PERIOD_CYC16_gc, /* RTC Clock Cycles 16 */ PERIOD_CYC32 = RTC_PERIOD_CYC32_gc, /* RTC Clock Cycles 32 */ PERIOD_CYC64 = RTC_PERIOD_CYC64_gc, /* RTC Clock Cycles 64 */ PERIOD_CYC128 = RTC_PERIOD_CYC128_gc, /* RTC Clock Cycles 128 */ PERIOD_CYC256 = RTC_PERIOD_CYC256_gc, /* RTC Clock Cycles 256 */ PERIOD_CYC512 = RTC_PERIOD_CYC512_gc, /* RTC Clock Cycles 512 */ PERIOD_CYC1024 = RTC_PERIOD_CYC1024_gc, /* RTC Clock Cycles 1024 */ PERIOD_CYC2048 = RTC_PERIOD_CYC2048_gc, /* RTC Clock Cycles 2048 */ PERIOD_CYC4096 = RTC_PERIOD_CYC4096_gc, /* RTC Clock Cycles 4096 */ PERIOD_CYC8192 = RTC_PERIOD_CYC8192_gc, /* RTC Clock Cycles 8192 */ PERIOD_CYC16384 = RTC_PERIOD_CYC16384_gc, /* RTC Clock Cycles 16384 */ PERIOD_CYC32768 = RTC_PERIOD_CYC32768_gc, /* RTC Clock Cycles 32768 */ } PERIOD; #if defined(RTC_EVGEN0SEL_gm) /* Event Generation 0 Select */ typedef enum { EVGEN0SEL_OFF = RTC_EVGEN0SEL_OFF_gc, /* No Event Generated */ EVGEN0SEL_DIV4 = RTC_EVGEN0SEL_DIV4_gc, /* CLK_RTC divided by 4 */ EVGEN0SEL_DIV8 = RTC_EVGEN0SEL_DIV8_gc, /* CLK_RTC divided by 8 */ EVGEN0SEL_DIV16 = RTC_EVGEN0SEL_DIV16_gc, /* CLK_RTC divided by 16 */ EVGEN0SEL_DIV32 = RTC_EVGEN0SEL_DIV32_gc, /* CLK_RTC divided by 32 */ EVGEN0SEL_DIV64 = RTC_EVGEN0SEL_DIV64_gc, /* CLK_RTC divided by 64 */ EVGEN0SEL_DIV128 = RTC_EVGEN0SEL_DIV128_gc, /* CLK_RTC divided by 128 */ EVGEN0SEL_DIV256 = RTC_EVGEN0SEL_DIV256_gc, /* CLK_RTC divided by 256 */ EVGEN0SEL_DIV512 = RTC_EVGEN0SEL_DIV512_gc, /* CLK_RTC divided by 512 */ EVGEN0SEL_DIV1024 = RTC_EVGEN0SEL_DIV1024_gc, /* CLK_RTC divided by 1024 */ EVGEN0SEL_DIV2048 = RTC_EVGEN0SEL_DIV2048_gc, /* CLK_RTC divided by 2048 */ EVGEN0SEL_DIV4096 = RTC_EVGEN0SEL_DIV4096_gc, /* CLK_RTC divided by 4096 */ EVGEN0SEL_DIV8192 = RTC_EVGEN0SEL_DIV8192_gc, /* CLK_RTC divided by 8192 */ EVGEN0SEL_DIV16384 = RTC_EVGEN0SEL_DIV16384_gc, /* CLK_RTC divided by 16384 */ EVGEN0SEL_DIV32768 = RTC_EVGEN0SEL_DIV32768_gc, /* CLK_RTC divided by 32768 */ } EVGEN0SEL; /* Event Generation 1 Select */ typedef enum { EVGEN1SEL_OFF = RTC_EVGEN1SEL_OFF_gc, /* No Event Generated */ EVGEN1SEL_DIV4 = RTC_EVGEN1SEL_DIV4_gc, /* CLK_RTC divided by 4 */ EVGEN1SEL_DIV8 = RTC_EVGEN1SEL_DIV8_gc, /* CLK_RTC divided by 8 */ EVGEN1SEL_DIV16 = RTC_EVGEN1SEL_DIV16_gc, /* CLK_RTC divided by 16 */ EVGEN1SEL_DIV32 = RTC_EVGEN1SEL_DIV32_gc, /* CLK_RTC divided by 32 */ EVGEN1SEL_DIV64 = RTC_EVGEN1SEL_DIV64_gc, /* CLK_RTC divided by 64 */ EVGEN1SEL_DIV128 = RTC_EVGEN1SEL_DIV128_gc, /* CLK_RTC divided by 128 */ EVGEN1SEL_DIV256 = RTC_EVGEN1SEL_DIV256_gc, /* CLK_RTC divided by 256 */ EVGEN1SEL_DIV512 = RTC_EVGEN1SEL_DIV512_gc, /* CLK_RTC divided by 512 */ EVGEN1SEL_DIV1024 = RTC_EVGEN1SEL_DIV1024_gc, /* CLK_RTC divided by 1024 */ EVGEN1SEL_DIV2048 = RTC_EVGEN1SEL_DIV2048_gc, /* CLK_RTC divided by 2048 */ EVGEN1SEL_DIV4096 = RTC_EVGEN1SEL_DIV4096_gc, /* CLK_RTC divided by 4096 */ EVGEN1SEL_DIV8192 = RTC_EVGEN1SEL_DIV8192_gc, /* CLK_RTC divided by 8192 */ EVGEN1SEL_DIV16384 = RTC_EVGEN1SEL_DIV16384_gc, /* CLK_RTC divided by 16384 */ EVGEN1SEL_DIV32768 = RTC_EVGEN1SEL_DIV32768_gc, /* CLK_RTC divided by 32768 */ } EVGEN1SEL; #endif /* Type of Callback Function */ typedef void (*callback_t)(void); static void begin(CLKSEL clksel = CLKSEL_OSC32K, PRESCALER prescaler = PRESCALER_DIV1) { end(); #if defined(RTC_EVGEN0SEL_gm) RTC.PITEVGENCTRLA = 0; #endif #if defined(RTC_ERROR_gm) RTC.CALIB = 0; #endif RTC.PITDBGCTRL = 0; RTC.PITINTFLAGS = RTC_PI_bm; RTC.PITINTCTRL = 0; RTC.DBGCTRL = 0; RTC.INTFLAGS = RTC_OVF_bm | RTC_CMP_bm; RTC.INTCTRL = RTC_OVF_bm; RTC.CLKSEL = clksel; regCNT(0); regPER(0xFFFF); regCTRLA(prescaler); } static void end(void) { regCTRLA(0); regPITCTRLA(0); } static void runstdby(bool enable = true) { regCTRLA((RTC.CTRLA & ~RTC_RUNSTDBY_bm) | (enable ? RTC_RUNSTDBY_bm : 0)); } static void dbgctrl(bool dbgrun = false) { RTC.PITDBGCTRL = dbgrun ? RTC_DBGRUN_bm : 0; RTC.DBGCTRL = dbgrun ? RTC_DBGRUN_bm : 0; } static void run(bool enable = true) { regCTRLA((RTC.CTRLA & ~RTC_RTCEN_bm) | (enable ? RTC_RTCEN_bm : 0)); } #if defined(RTC_ERROR_gm) static void calib(int8_t ppm = 0) { RTC.CALIB = ppm; regCTRLA((RTC.CTRLA & ~RTC_CORREN_bm) | (ppm ? RTC_CORREN_bm : 0)); } #endif #if defined(RTC_EVGEN0SEL_gm) static void event(EVGEN0SEL evgen0 = EVGEN0SEL_OFF, EVGEN1SEL evgen1 = EVGEN1SEL_OFF) { RTC.PITEVGENCTRLA = evgen1 | evgen0; } #endif static void callback(callback_t func) { _callback[0] = func; } static void interval(uint32_t tick) { if (tick) _interval = tick; } static void interrupt(uint32_t tick) { if (tick) { interval(tick); regCMP(RTC.CNT); setup(); RTC.INTCTRL |= (RTC.INTFLAGS = RTC_CMP_bm); } else { RTC.INTCTRL &= ~RTC_CMP_bm; } } static void callbackPIT(callback_t func) { _callback[1] = func; } static void intervalPIT(PERIOD period) { regPITCTRLA((RTC.PITCTRLA & ~(RTC_PERIOD_gm | RTC_PITEN_bm)) | period | (period != PERIOD_OFF ? RTC_PITEN_bm : 0)); } static void interruptPIT(PERIOD period) { intervalPIT(period); if (period != PERIOD_OFF) RTC.PITINTCTRL = (RTC.PITINTFLAGS = RTC_PI_bm); else RTC.PITINTCTRL = 0; } static uint32_t read(void) { union { uint32_t d; struct { uint16_t l, h; } w; } x; do { x.w.h = _overflow; x.w.l = RTC.CNT; } while (x.w.h != _overflow); return x.d; } static void delay(uint32_t tick) { for (uint32_t t = read(); read() - t < tick; ) avr8_yield(); } protected: static uint16_t _khz; static volatile uint16_t _overflow; static volatile uint16_t _counter; static uint32_t _interval; static callback_t _callback[2]; friend void rtc_isr_cnt(void); friend void rtc_isr_pit(void); inline static void isr_cnt(void) { uint8_t flags = RTC.INTFLAGS = RTC.INTFLAGS; if (flags & RTC_OVF_bm) ++_overflow; if (flags & RTC_CMP_bm) { if (--_counter) regCMP(RTC.CMP + 0x8000); else { if (_callback[0]) _callback[0](); setup(); } } } inline static void isr_pit(void) { if ((RTC.PITINTFLAGS = RTC.PITINTFLAGS) & RTC_PI_bm) { if (_callback[1]) _callback[1](); } } static void setup(void) __attribute__((noinline)) { int16_t next = (int16_t)_interval; if ((_counter = ((uint16_t)(_interval >> 16) << 1) | (next < 0 ? 1 : 0))) next |= 0x8000; else _counter = 1; regCMP(RTC.CMP + next); } static void regCTRLA(uint8_t value) { while (RTC.STATUS & RTC_CTRLABUSY_bm) continue; RTC.CTRLA = value; } static void regCNT(uint16_t value) { while (RTC.STATUS & RTC_CNTBUSY_bm) continue; RTC.CNT = value; } static void regPER(uint16_t value) { while (RTC.STATUS & RTC_PERBUSY_bm) continue; RTC.PER = value; } static void regCMP(uint16_t value) { while (RTC.STATUS & RTC_CMPBUSY_bm) continue; RTC.CMP = value; } static void regPITCTRLA(uint8_t value) { while (RTC.PITSTATUS & RTC_CTRLBUSY_bm) continue; RTC.PITCTRLA = value; } }; #endif |
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/* avr8_rtc.cpp - RTC Driver for Microchip AVR8 Series Copyright (c) 2025 Sasapea's Lab. All right reserved. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or at your option) any later version. This program 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>. */ #include "avr8_rtc.h" #if CONFIG_RTC_USE uint16_t Rtc::_khz; volatile uint16_t Rtc::_overflow; volatile uint16_t Rtc::_counter; uint32_t Rtc::_interval; Rtc::callback_t Rtc::_callback[]; inline void rtc_isr_cnt(void) { Rtc::isr_cnt(); } inline void rtc_isr_pit(void) { Rtc::isr_pit(); } ISR(RTC_CNT_vect) { rtc_isr_cnt(); } ISR(RTC_PIT_vect) { rtc_isr_pit(); } #endif |
【関連投稿】
Microchip AVR8 用のライブラリを自作する。(GPIO)
Microchip AVR8 用のライブラリを自作する。(FUSE)
Microchip AVR8 用のライブラリを自作する。(CLOCK)
Microchip AVR8 用のライブラリを自作する。(RESET)
Microchip AVR8 用のライブラリを自作する。(PORTMUX)
Microchip AVR8 用のライブラリを自作する。(USART)
Microchip AVR8 用のライブラリを自作する。(RTC)
Microchip AVR8 用のライブラリを自作する。(TCA)
Microchip AVR8 用のライブラリを自作する。(TCB)
Microchip AVR8 用のライブラリを自作する。(VREF)
Microchip AVR8 用のライブラリを自作する。(DAC)
Microchip AVR8 用のライブラリを自作する。(AC)
Microchip AVR8 用のライブラリを自作する。(ADC)
Microchip AVR8 用のライブラリを自作する。(ZCD)
Microchip AVR8 用のライブラリを自作する。(SPI)
Microchip AVR8 用のライブラリを自作する。(TWI)
Microchip AVR8 用のライブラリを自作する。(YIELD)
Microchip AVR8 用のライブラリを自作する。(CONFIG)