188 lines
4.0 KiB
C
188 lines
4.0 KiB
C
/*
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* File : rtc.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://openlab.rt-thread.com/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2009-04-26 yi.qiu first version
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* 2010-03-18 Gary Lee add functions such as GregorianDay
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* and rtc_time_to_tm
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* 2009-03-20 yi.qiu clean up
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*/
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#include <rtthread.h>
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#include <time.h>
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#include <s3c24x0.h>
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// #define RTC_DEBUG
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#define RTC_ENABLE RTCCON |= 0x01; /*RTC read and write enable */
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#define RTC_DISABLE RTCCON &= ~0x01; /* RTC read and write disable */
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#define BCD2BIN(n) (((((n) >> 4) & 0x0F) * 10) + ((n) & 0x0F))
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#define BIN2BCD(n) ((((n) / 10) << 4) | ((n) % 10))
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/**
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* This function get rtc time
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*/
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void rt_hw_rtc_get(struct tm *ti)
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{
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rt_uint8_t sec, min, hour, mday, wday, mon, year;
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/* enable access to RTC registers */
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RTCCON |= RTC_ENABLE;
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/* read RTC registers */
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do
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{
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sec = BCDSEC;
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min = BCDMIN;
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hour = BCDHOUR;
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mday = BCDDATE;
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wday = BCDDAY;
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mon = BCDMON;
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year = BCDYEAR;
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} while (sec != BCDSEC);
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#ifdef RTC_DEBUG
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rt_kprintf("sec:%x min:%x hour:%x mday:%x wday:%x mon:%x year:%x\n",
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sec, min, hour, mday, wday, mon, year);
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#endif
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/* disable access to RTC registers */
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RTC_DISABLE
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ti->tm_sec = BCD2BIN(sec & 0x7F);
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ti->tm_min = BCD2BIN(min & 0x7F);
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ti->tm_hour = BCD2BIN(hour & 0x3F);
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ti->tm_mday = BCD2BIN(mday & 0x3F);
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ti->tm_mon = BCD2BIN(mon & 0x1F);
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ti->tm_year = BCD2BIN(year);
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ti->tm_wday = BCD2BIN(wday & 0x07);
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ti->tm_yday = 0;
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ti->tm_isdst = 0;
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}
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/**
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* This function set rtc time
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*/
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void rt_hw_rtc_set(struct tm *ti)
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{
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rt_uint8_t sec, min, hour, mday, wday, mon, year;
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year = BIN2BCD(ti->tm_year);
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mon = BIN2BCD(ti->tm_mon);
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wday = BIN2BCD(ti->tm_wday);
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mday = BIN2BCD(ti->tm_mday);
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hour = BIN2BCD(ti->tm_hour);
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min = BIN2BCD(ti->tm_min);
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sec = BIN2BCD(ti->tm_sec);
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/* enable access to RTC registers */
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RTC_ENABLE
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do{
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/* write RTC registers */
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BCDSEC = sec;
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BCDMIN = min;
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BCDHOUR = hour;
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BCDDATE = mday;
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BCDDAY = wday;
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BCDMON = mon;
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BCDYEAR = year;
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}while (sec != BCDSEC);
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/* disable access to RTC registers */
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RTC_DISABLE
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}
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/**
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* This function reset rtc
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*/
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void rt_hw_rtc_reset (void)
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{
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RTCCON = (RTCCON & ~0x06) | 0x08;
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RTCCON &= ~(0x08|0x01);
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}
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static struct rt_device rtc;
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static rt_err_t rtc_open(rt_device_t dev, rt_uint16_t oflag)
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{
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RTC_ENABLE
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return RT_EOK;
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}
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static rt_err_t rtc_close(rt_device_t dev)
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{
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RTC_DISABLE
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return RT_EOK;
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}
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static rt_size_t 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_err_t rtc_control(rt_device_t dev, rt_uint8_t cmd, void *args)
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{
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struct tm tm, *tm_ptr;
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time_t *time;
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RT_ASSERT(dev != RT_NULL);
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time = (time_t *)args;
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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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/* read device */
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rt_hw_rtc_get(&tm);
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*((rt_time_t *)args) = mktime(&tm);
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break;
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case RT_DEVICE_CTRL_RTC_SET_TIME:
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tm_ptr = localtime(time);
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/* write device */
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rt_hw_rtc_set(tm_ptr);
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break;
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}
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return RT_EOK;
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}
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void rt_hw_rtc_init(void)
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{
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rtc.type = RT_Device_Class_RTC;
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/* register rtc device */
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rtc.init = RT_NULL;
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rtc.open = rtc_open;
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rtc.close = rtc_close;
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rtc.read = rtc_read;
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rtc.write = RT_NULL;
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rtc.control = rtc_control;
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/* no private */
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rtc.user_data = RT_NULL;
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rt_device_register(&rtc, "rtc", RT_DEVICE_FLAG_RDWR);
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}
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#include <finsh.h>
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void list_date()
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{
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time_t time;
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rt_device_t device;
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device = rt_device_find("rtc");
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if (device != RT_NULL)
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{
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rt_device_control(device, RT_DEVICE_CTRL_RTC_GET_TIME, &time);
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rt_kprintf("%d, %s\n", time, ctime(&time));
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}
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}
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FINSH_FUNCTION_EXPORT(list_date, list date);
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