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TencentOS-tiny/board/ALPHA_I.MX_emmc_256ddr/bsp/rtc/bsp_rtc.c
daishengdong 3d9d6198c8 add cortex-v7a support
How To Run:
    see TencentOS-tiny\board\ALPHA_I.MX_emmc_256ddr\README.md

TODO Next:
1. VFP support
2. fault diagnosis support
3. qemu vexpress ca9 support
4. raspberry pi support
5. SMP support
2020-01-19 19:06:24 +08:00

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/***************************************************************
Copyright © zuozhongkai Co., Ltd. 1998-2019. All rights reserved.
文件名 : bsp_rtc.c
作者 : 左忠凯
版本 : V1.0
描述 : RTC驱动文件。
其他 : 无
论坛 : www.openedv.com
日志 : 初版V1.0 2019/1/3 左忠凯创建
***************************************************************/
#include "bsp_rtc.h"
#include "printf.h"
/*
* 描述:初始化RTC
*/
void rtc_init(void)
{
/*
* 设置HPCOMR寄存器
* bit[31] 1 : 允许访问SNVS寄存器一定要置1
* bit[8] 1 : 此位置1需要签署NDA协议才能看到此位的详细说明
* 这里不置1也没问题
*/
SNVS->HPCOMR |= (1 << 31) | (1 << 8);
#if 0
struct rtc_datetime rtcdate;
rtcdate.year = 2018U;
rtcdate.month = 12U;
rtcdate.day = 13U;
rtcdate.hour = 14U;
rtcdate.minute = 52;
rtcdate.second = 0;
rtc_setDatetime(&rtcdate); //初始化时间和日期
#endif
rtc_enable(); //使能RTC
}
/*
* 描述: 开启RTC
*/
void rtc_enable(void)
{
/*
* LPCR寄存器bit0置1使能RTC
*/
SNVS->LPCR |= 1 << 0;
while(!(SNVS->LPCR & 0X01));//等待使能完成
}
/*
* 描述: 关闭RTC
*/
void rtc_disable(void)
{
/*
* LPCR寄存器bit0置0关闭RTC
*/
SNVS->LPCR &= ~(1 << 0);
while(SNVS->LPCR & 0X01);//等待关闭完成
}
/*
* @description : 判断指定年份是否为闰年,闰年条件如下:
* @param - year: 要判断的年份
* @return : 1 是闰年0 不是闰年
*/
unsigned char rtc_isleapyear(unsigned short year)
{
unsigned char value=0;
if(year % 400 == 0)
value = 1;
else
{
if((year % 4 == 0) && (year % 100 != 0))
value = 1;
else
value = 0;
}
return value;
}
/*
* @description : 将时间转换为秒数
* @param - datetime: 要转换日期和时间。
* @return : 转换后的秒数
*/
unsigned int rtc_coverdate_to_seconds(struct rtc_datetime *datetime)
{
unsigned short i = 0;
unsigned int seconds = 0;
unsigned int days = 0;
unsigned short monthdays[] = {0U, 0U, 31U, 59U, 90U, 120U, 151U, 181U, 212U, 243U, 273U, 304U, 334U};
for(i = 1970; i < datetime->year; i++)
{
days += DAYS_IN_A_YEAR; /* 平年每年365天 */
if(rtc_isleapyear(i)) days += 1;/* 闰年多加一天 */
}
days += monthdays[datetime->month];
if(rtc_isleapyear(i) && (datetime->month >= 3)) days += 1;/* 闰年并且当前月份大于等于3月的话加一天 */
days += datetime->day - 1;
seconds = days * SECONDS_IN_A_DAY +
datetime->hour * SECONDS_IN_A_HOUR +
datetime->minute * SECONDS_IN_A_MINUTE +
datetime->second;
return seconds;
}
/*
* @description : 设置时间和日期
* @param - datetime: 要设置的日期和时间
* @return : 无
*/
void rtc_setdatetime(struct rtc_datetime *datetime)
{
unsigned int seconds = 0;
unsigned int tmp = SNVS->LPCR;
rtc_disable(); /* 设置寄存器HPRTCMR和HPRTCLR的时候一定要先关闭RTC */
/* 先将时间转换为秒 */
seconds = rtc_coverdate_to_seconds(datetime);
SNVS->LPSRTCMR = (unsigned int)(seconds >> 17); /* 设置高16位 */
SNVS->LPSRTCLR = (unsigned int)(seconds << 15); /* 设置地16位 */
/* 如果此前RTC是打开的在设置完RTC时间以后需要重新打开RTC */
if (tmp & 0x1)
rtc_enable();
}
/*
* @description : 将秒数转换为时间
* @param - seconds : 要转换的秒数
* @param - datetime: 转换后的日期和时间
* @return : 无
*/
void rtc_convertseconds_to_datetime(unsigned int seconds, struct rtc_datetime *datetime)
{
unsigned int x;
unsigned int secondsRemaining, days;
unsigned short daysInYear;
/* 每个月的天数 */
unsigned char daysPerMonth[] = {0U, 31U, 28U, 31U, 30U, 31U, 30U, 31U, 31U, 30U, 31U, 30U, 31U};
secondsRemaining = seconds; /* 剩余秒数初始化 */
days = secondsRemaining / SECONDS_IN_A_DAY + 1; /* 根据秒数计算天数,加1是当前天数 */
secondsRemaining = secondsRemaining % SECONDS_IN_A_DAY; /*计算天数以后剩余的秒数 */
/* 计算时、分、秒 */
datetime->hour = secondsRemaining / SECONDS_IN_A_HOUR;
secondsRemaining = secondsRemaining % SECONDS_IN_A_HOUR;
datetime->minute = secondsRemaining / 60;
datetime->second = secondsRemaining % SECONDS_IN_A_MINUTE;
/* 计算年 */
daysInYear = DAYS_IN_A_YEAR;
datetime->year = YEAR_RANGE_START;
while(days > daysInYear)
{
/* 根据天数计算年 */
days -= daysInYear;
datetime->year++;
/* 处理闰年 */
if (!rtc_isleapyear(datetime->year))
daysInYear = DAYS_IN_A_YEAR;
else /*闰年,天数加一 */
daysInYear = DAYS_IN_A_YEAR + 1;
}
/*根据剩余的天数计算月份 */
if(rtc_isleapyear(datetime->year)) /* 如果是闰年的话2月加一天 */
daysPerMonth[2] = 29;
for(x = 1; x <= 12; x++)
{
if (days <= daysPerMonth[x])
{
datetime->month = x;
break;
}
else
{
days -= daysPerMonth[x];
}
}
datetime->day = days;
}
/*
* @description : 获取RTC当前秒数
* @param : 无
* @return : 当前秒数
*/
unsigned int rtc_getseconds(void)
{
unsigned int seconds = 0;
seconds = (SNVS->LPSRTCMR << 17) | (SNVS->LPSRTCLR >> 15);
return seconds;
}
/*
* @description : 获取当前时间
* @param - datetime: 获取到的时间,日期等参数
* @return : 无
*/
void rtc_getdatetime(struct rtc_datetime *datetime)
{
unsigned int seconds = 0;
seconds = rtc_getseconds();
rtc_convertseconds_to_datetime(seconds, datetime);
}