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- /*!
- \file main.c
- \brief standby wakeup through RTC alarm interrupt
- \version 2021-12-30, V1.0.0, firmware for GD32F30x
- */
- /*
- Copyright (c) 2021, GigaDevice Semiconductor Inc.
- Redistribution and use in source and binary forms, with or without modification,
- are permitted provided that the following conditions are met:
- 1. Redistributions of source code must retain the above copyright notice, this
- list of conditions and the following disclaimer.
- 2. 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.
- 3. Neither the name of the copyright holder nor the names of its 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 HOLDER 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.
- */
- #include "gd32f30x.h"
- #include "gd32f307c_eval.h"
- #include "systick.h"
- #include "main.h"
- void led_config(void);
- void rtc_configuration(void);
- /*!
- \brief main function
- \param[in] none
- \param[out] none
- \retval none
- */
- int main(void)
- {
- systick_config();
- /* LED configuration and turn on all LEDs */
- led_config();
- gd_eval_led_on(LED2);
- gd_eval_led_on(LED3);
- gd_eval_led_on(LED4);
- gd_eval_led_on(LED5);
- /* delay 2s */
- delay_1ms(2000);
- /* enable PMU clock */
- rcu_periph_clock_enable(RCU_PMU);
- /* configure RTC */
- rtc_configuration();
- /* PMU enters standby mode */
- pmu_to_standbymode();
- while(1) {
- }
- }
- /*!
- \brief configure LEDs
- \param[in] none
- \param[out] none
- \retval none
- */
- void led_config(void)
- {
- gd_eval_led_init(LED2);
- gd_eval_led_init(LED3);
- gd_eval_led_init(LED4);
- gd_eval_led_init(LED5);
- }
- /*!
- \brief configure the RTC
- \param[in] none
- \param[out] none
- \retval none
- */
- void rtc_configuration(void)
- {
- /* enable BKPI clock */
- rcu_periph_clock_enable(RCU_BKPI);
- /* allow access to backup domain */
- pmu_backup_write_enable();
- /* reset backup domain */
- bkp_deinit();
- /* enable IRC40K */
- rcu_osci_on(RCU_IRC40K);
- /* wait till IRC40K is ready */
- rcu_osci_stab_wait(RCU_IRC40K);
- /* select RCU_IRC40K as RTC clock source */
- rcu_rtc_clock_config(RCU_RTCSRC_IRC40K);
- /* enable RTC clock */
- rcu_periph_clock_enable(RCU_RTC);
- /* wait for RTC registers synchronization */
- rtc_register_sync_wait();
- /* wait until last write operation on RTC registers has finished */
- rtc_lwoff_wait();
- /* enable the RTC alarm interrupt */
- rtc_interrupt_enable(RTC_INT_ALARM);
- /* wait until last write operation on RTC registers has finished */
- rtc_lwoff_wait();
- /* set RTC prescaler: set RTC period to 1s */
- rtc_prescaler_set(40000);
- /* wait until last write operation on RTC registers has finished */
- rtc_lwoff_wait();
- rtc_counter_set(0U);
- /* wait until last write operation on RTC registers has finished */
- rtc_lwoff_wait();
- rtc_alarm_config(ALARM_TIME_INTERVAL);
- /* wait until last write operation on RTC registers has finished */
- rtc_lwoff_wait();
- /* clear the RTC alarm flag */
- rtc_flag_clear(RTC_FLAG_ALARM);
- }
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