140 lines
3.2 KiB
C
140 lines
3.2 KiB
C
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/*
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* Copyright (c) 2006-2021, 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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* 2021-02-20 iysheng first version
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*/
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#include <board.h>
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#include <sys/time.h>
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#include <drivers/drv_comm.h>
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#define DBG_TAG "drv.rtc"
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#define DBG_LVL DBG_INFO
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#include <rtdbg.h>
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#ifdef RT_USING_RTC
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typedef struct {
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struct rt_device rtc_dev;
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} gd32_rtc_device;
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static gd32_rtc_device g_gd32_rtc_dev;
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static time_t get_rtc_timestamp(void)
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{
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time_t rtc_counter;
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rtc_counter = (time_t)RTC_GetCounter();
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return rtc_counter;
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}
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static rt_err_t set_rtc_timestamp(time_t time_stamp)
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{
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uint32_t rtc_counter;
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rtc_counter = (uint32_t)time_stamp;
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/* wait until LWOFF bit in RTC_CTL to 1 */
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RTC_WaitLWOFF();
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/* enter configure mode */
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RTC_EnterConfigMode();
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/* write data to rtc register */
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RTC_SetCounter(rtc_counter);
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/* exit configure mode */
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RTC_ExitConfigMode();
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/* wait until LWOFF bit in RTC_CTL to 1 */
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RTC_WaitLWOFF();
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return RT_EOK;
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}
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static rt_err_t rt_gd32_rtc_control(rt_device_t dev, int cmd, void *args)
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{
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rt_err_t result = RT_EOK;
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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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*(rt_uint32_t *)args = get_rtc_timestamp();
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break;
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case RT_DEVICE_CTRL_RTC_SET_TIME:
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if (set_rtc_timestamp(*(rt_uint32_t *)args))
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{
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result = -RT_ERROR;
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}
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break;
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}
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return result;
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}
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#ifdef RT_USING_DEVICE_OPS
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const static struct rt_device_ops g_gd32_rtc_ops =
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{
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RT_NULL,
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RT_NULL,
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RT_NULL,
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RT_NULL,
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RT_NULL,
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rt_gd32_rtc_control
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};
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#endif
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static int rt_hw_rtc_init(void)
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{
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rt_err_t ret;
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time_t rtc_counter;
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rcu_periph_clock_enable(RCU_PMU);
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PWR_BackupAccess_Enable(ENABLE);
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rcu_periph_clock_enable(RCU_BKPI);
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rtc_counter = get_rtc_timestamp();
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/* once the rtc clock source has been selected, if can't be changed
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* anymore unless the Backup domain is reset */
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rcu_bkp_reset_enable();
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rcu_bkp_reset_disable();
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rcu_periph_clock_enable(RCU_RTC);
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rcu_osci_on(RCU_LXTAL);
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if (SUCCESS == rcu_osci_stab_wait(RCU_LXTAL))
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{
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/* set lxtal as rtc clock source */
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rcu_rtc_clock_config(RCU_RTCSRC_LXTAL);
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}
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set_rtc_timestamp(rtc_counter);
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#ifdef RT_USING_DEVICE_OPS
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g_gd32_rtc_dev.rtc_dev.ops = &g_gd32_rtc_ops;
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#else
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g_gd32_rtc_dev.rtc_dev.init = RT_NULL;
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g_gd32_rtc_dev.rtc_dev.open = RT_NULL;
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g_gd32_rtc_dev.rtc_dev.close = RT_NULL;
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g_gd32_rtc_dev.rtc_dev.read = RT_NULL;
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g_gd32_rtc_dev.rtc_dev.write = RT_NULL;
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g_gd32_rtc_dev.rtc_dev.control = rt_gd32_rtc_control;
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#endif
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g_gd32_rtc_dev.rtc_dev.type = RT_Device_Class_RTC;
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g_gd32_rtc_dev.rtc_dev.rx_indicate = RT_NULL;
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g_gd32_rtc_dev.rtc_dev.tx_complete = RT_NULL;
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g_gd32_rtc_dev.rtc_dev.user_data = RT_NULL;
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ret = rt_device_register(&g_gd32_rtc_dev.rtc_dev, "rtc", \
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RT_DEVICE_FLAG_RDWR);
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if (ret != RT_EOK)
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{
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LOG_E("failed register internal rtc device, err=%d", ret);
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}
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return ret;
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}
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INIT_DEVICE_EXPORT(rt_hw_rtc_init);
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#endif
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