163 lines
6.6 KiB
C
163 lines
6.6 KiB
C
/* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/** library to communicate with the Maxim DS1307 I2C RTC IC (API)
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* @file rtc_ds1307.h
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* @author King Kévin <kingkevin@cuvoodoo.info>
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* @date 2016
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* @note user RAM is not handled
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* @note peripherals used: I2C @ref rtc_ds1307_i2c, GPIO & timer @ref rtc_ds1307_square_wave_timer
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*/
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#pragma once
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/** @defgroup rtc_ds1307_i2c I2C peripheral used to communication with the DS1307 RTC IC
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* @{
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*/
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/** I2C peripheral */
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#define RTC_DS1307_I2C I2C1 /**< I2C peripheral */
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#define RTC_DS1307_I2C_RCC RCC_I2C1 /**< I2C peripheral clock */
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#define RTC_DS1307_I2C_PORT_RCC RCC_GPIOB /**< I2C I/O peripheral clock */
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#define RTC_DS1307_I2C_PORT GPIOB /**< I2C I/O peripheral port */
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#define RTC_DS1307_I2C_PIN_SDA GPIO_I2C1_SDA /**< I2C peripheral data pin (PB7) */
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#define RTC_DS1307_I2C_PIN_SCL GPIO_I2C1_SCL /**< I2C peripheral clock pin (PB6) */
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#define RTC_DS1307_I2C_ADDR 0x68 /**< DS1307 I2C address (fixed to 0b1101000) */
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/** @} */
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/** @defgroup rtc_ds1307_square_wave_timer timer peripheral used to count timer based on RTC IC square wave output
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* @note comment out SQUARE_WAVE_TICS to not disable feature
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* @{
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*/
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#define RTC_DS1307_SQUARE_WAVE_TICKS (RTC_DS1307_SQUARE_WAVE_FREQUENCY/256) /**< number of square wave tics before setting rtc_ds1307_tic_flag */
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#define RTC_DS1307_SQUARE_WAVE_FREQUENCY 4096 /**< square wave output frequency from the RTC IC */
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#define RTC_DS1307_SQUARE_WAVE_TIMER TIM2 /**< timer peripheral */
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#define RTC_DS1307_SQUARE_WAVE_TIMER_RCC RCC_TIM2 /**< timer peripheral clock */
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#define RTC_DS1307_SQUARE_WAVE_TIMER_IC TIM_IC1 /**< input capture channel (for TIM2_CH1) */
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#define RTC_DS1307_SQUARE_WAVE_TIMER_IN TIM_IC_IN_TI1 /**< input capture input source (TIM2_CH1 becomes TI1, then TI1F, then TI1FP1) */
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#define RTC_DS1307_SQUARE_WAVE_TIMER_TS TIM_SMCR_TS_IT1FP1 /**< input capture trigger (actually TI1FP1) */
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#define RTC_DS1307_SQUARE_WAVE_TIMER_IRQ NVIC_TIM2_IRQ /**< timer interrupt */
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#define RTC_DS1307_SQUARE_WAVE_TIMER_ISR tim2_isr /**< timer interrupt service routine */
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#define RTC_DS1307_SQUARE_WAVE_GPIO_RCC RCC_GPIOA /**< timer port peripheral clock (TIM2_CH1 on PA0)*/
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#define RTC_DS1307_SQUARE_WAVE_GPIO_PORT GPIOA /**< timer port (TIM2_CH1 on PA0) */
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#define RTC_DS1307_SQUARE_WAVE_GPIO_PIN GPIO_TIM2_CH1_ETR /**< timer pin input, connect to RTC IC square wave output (TIM2_CH1 on PA0) */
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/** @} */
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#if defined(RTC_DS1307_SQUARE_WAVE_TICKS)
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extern volatile uint32_t rtc_ds1307_ticks; /**< increment on SQUARE_WAVE_TICS square wave ticks */
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extern volatile bool rtc_ds1307_tick_flag; /**< set on SQUARE_WAVE_TICS square wave ticks */
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#endif
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/** setup communication with RTC IC
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* configure the I2C port defined in the sources
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*/
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void rtc_ds1307_setup(void);
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/** verify if oscillator is disabled
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* @return if oscillator is disabled
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*/
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bool rtc_ds1307_oscillator_disabled(void);
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/** read square wave output frequency (in Hz)
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* @return square wave output frequency in Hz, 0 if disabled
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*/
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uint16_t rtc_ds1307_read_square_wave(void);
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/** read seconds from RTC IC
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* @return number of seconds (0-59) of the current time
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*/
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uint8_t rtc_ds1307_read_seconds(void);
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/** read minutes from RTC IC
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* @return number of minutes (0-59) of the current time
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*/
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uint8_t rtc_ds1307_read_minutes(void);
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/** read hours from RTC IC
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* @return number of hours (0-23) of the current time
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*/
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uint8_t rtc_ds1307_read_hours(void);
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/** read day from RTC IC
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* @return day of the week (1-7, 1 is Sunday) of the current time, 1 being Sunday
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*/
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uint8_t rtc_ds1307_read_day(void);
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/** read date from RTC IC
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* @return day of the month (1-31) of the current time
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*/
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uint8_t rtc_ds1307_read_date(void);
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/** read month from RTC IC
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* @return month of the year (1-12) of the current time
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*/
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uint8_t rtc_ds1307_read_month(void);
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/** read year from RTC IC
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* @return year of the century (00-99) of the current time
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*/
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uint8_t rtc_ds1307_read_year(void);
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/** read time from RTC IC
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* @return array of {seconds, minutes, hours, day, date, month, year} as defined above
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*/
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uint8_t* rtc_ds1307_read_time(void);
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/** disable RTC IC oscillator
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* @return if disabling oscillator succeeded
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*/
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bool rtc_ds1307_oscillator_disable(void);
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/** enable RTC IC oscillator
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* @return if enabling oscillator succeeded
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*/
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bool rtc_ds1307_oscillator_enable(void);
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/** write square wave output frequency (in Hz)
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* @param[in] frequency square wave output frequency in Hz (0 to disable, 1, 4096, 8192, 32768)
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* @return if write succeeded
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*/
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bool rtc_ds1307_write_square_wave(uint16_t frequency);
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/** write seconds into RTC IC
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* @param[in] seconds number of seconds (0-59)
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* @return if write succeeded
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*/
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bool rtc_ds1307_write_seconds(uint8_t seconds);
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/** write minutes into RTC IC
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* @param[in] minutes number of minutes (0-59)
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* @return if write succeeded
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*/
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bool rtc_ds1307_write_minutes(uint8_t minutes);
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/** write hours into RTC IC
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* @param[in] hours number of hours (0-23)
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* @return if write succeeded
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*/
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bool rtc_ds1307_write_hours(uint8_t hours);
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/** write day into RTC IC
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* @param[in] day day of the week (1-7, 1 is Sunday)
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* @return if write succeeded
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*/
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bool rtc_ds1307_write_day(uint8_t day);
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/** write date into RTC IC
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* @param[in] date day of the month (1-31)
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* @return if write succeeded
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*/
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bool rtc_ds1307_write_date(uint8_t date);
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/** write month into RTC IC
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* @param[in] month month of the year (1-12)
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* @return if write succeeded
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*/
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bool rtc_ds1307_write_month(uint8_t month);
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/** write year into RTC IC
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* @param[in] year year of the century (00-99)
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* @return if write succeeded
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*/
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bool rtc_ds1307_write_year(uint8_t year);
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/** write time into RTC IC
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* @param[in] seconds number of seconds (0-59)
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* @param[in] minutes number of minutes (0-59)
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* @param[in] hours number of hours (0-23)
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* @param[in] day day of the week (1-7, 1 is Sunday)
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* @param[in] date day of the month (1-31)
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* @param[in] month month of the year (1-12)
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* @param[in] year year of the century (00-99)
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* @return if write succeeded
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*/
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bool rtc_ds1307_write_time(uint8_t seconds, uint8_t minutes, uint8_t hours, uint8_t day, uint8_t date, uint8_t month, uint8_t year);
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