161 lines
3.5 KiB
C
161 lines
3.5 KiB
C
/*
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* Copyright (c) 2006-2020, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2020-06-08 hqfang first implementation.
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*/
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#include "drv_rtc.h"
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#ifdef BSP_USING_RTC
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static time_t get_timestamp(void)
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{
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return (time_t)rtc_counter_get();
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}
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static int set_timestamp(time_t timestamp)
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{
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/* wait until last write operation on RTC registers has finished */
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rtc_lwoff_wait();
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/* change the current time */
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rtc_counter_set((uint32_t)timestamp);
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/* wait until last write operation on RTC registers has finished */
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rtc_lwoff_wait();
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return RT_EOK;
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}
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static void rtc_configuration(void)
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{
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/* enable PMU and BKPI clocks */
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rcu_periph_clock_enable(RCU_BKPI);
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rcu_periph_clock_enable(RCU_PMU);
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/* allow access to BKP domain */
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pmu_backup_write_enable();
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/* reset backup domain */
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bkp_deinit();
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/* enable LXTAL */
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rcu_osci_on(RCU_LXTAL);
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/* wait till LXTAL is ready */
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rcu_osci_stab_wait(RCU_LXTAL);
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/* select RCU_LXTAL as RTC clock source */
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rcu_rtc_clock_config(RCU_RTCSRC_LXTAL);
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/* enable RTC Clock */
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rcu_periph_clock_enable(RCU_RTC);
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/* wait for RTC registers synchronization */
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rtc_register_sync_wait();
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/* wait until last write operation on RTC registers has finished */
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rtc_lwoff_wait();
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/* wait until last write operation on RTC registers has finished */
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rtc_lwoff_wait();
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/* set RTC prescaler: set RTC period to 1s */
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rtc_prescaler_set(32767);
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/* wait until last write operation on RTC registers has finished */
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rtc_lwoff_wait();
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}
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static rt_err_t gd32_rtc_init(rt_device_t dev)
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{
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if (bkp_data_read(BKP_DATA_0) != 0xA5A5)
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{
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rtc_configuration();
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bkp_data_write(BKP_DATA_0, 0xA5A5);
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}
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else
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{
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/* allow access to BKP domain */
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rcu_periph_clock_enable(RCU_PMU);
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pmu_backup_write_enable();
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/* wait for RTC registers synchronization */
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rtc_register_sync_wait();
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/* wait until last write operation on RTC registers has finished */
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rtc_lwoff_wait();
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}
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return RT_EOK;
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}
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static rt_err_t gd32_rtc_open(rt_device_t dev, rt_uint16_t oflag)
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{
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return RT_EOK;
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}
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static rt_err_t gd32_rtc_close(rt_device_t dev)
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{
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return RT_EOK;
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}
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static rt_size_t gd32_rtc_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)
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{
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return RT_EOK;
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}
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static rt_size_t gd32_rtc_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
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{
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return RT_EOK;
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}
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static rt_err_t gd32_rtc_control(rt_device_t dev, int cmd, void *args)
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{
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RT_ASSERT(dev != RT_NULL);
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switch (cmd)
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{
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case RT_DEVICE_CTRL_RTC_GET_TIME:
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{
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*(uint32_t *)args = get_timestamp();
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}
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break;
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case RT_DEVICE_CTRL_RTC_SET_TIME:
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{
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set_timestamp(*(time_t *)args);
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}
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break;
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default:
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return RT_EINVAL;
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}
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return RT_EOK;
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}
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static struct rt_device rtc_device =
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{
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.type = RT_Device_Class_RTC,
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.init = gd32_rtc_init,
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.open = gd32_rtc_open,
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.close = gd32_rtc_close,
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.read = gd32_rtc_read,
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.write = gd32_rtc_write,
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.control = gd32_rtc_control,
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};
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int rt_hw_rtc_init(void)
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{
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rt_err_t ret = RT_EOK;
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ret = rt_device_register(&rtc_device, "rtc", RT_DEVICE_FLAG_RDWR);
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rt_device_open(&rtc_device, RT_DEVICE_OFLAG_RDWR);
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return RT_EOK;
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}
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INIT_DEVICE_EXPORT(rt_hw_rtc_init);
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#endif /* BSP_USING_RTC */
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