利用IAR编写基于MSP430单片机的实时时钟设计的代码,要求:可使用MSP430单片机内部定时器,基本显示:年,月,日,时,分,秒,可调整时间,设置闹钟
时间: 2023-10-05 07:06:41 浏览: 36
以下是一个基于MSP430单片机的实时时钟设计的代码,使用MSP430单片机内部定时器,并提供了基本的时间显示和闹钟设置功能。请注意,这只是一个示例代码,您可能需要根据您的具体要求进行修改。
```
#include <msp430.h>
#define LED BIT7
#define BTN BIT3
volatile unsigned int second = 0;
volatile unsigned int minute = 0;
volatile unsigned int hour = 0;
volatile unsigned int day = 1;
volatile unsigned int month = 1;
volatile unsigned int year = 2021;
volatile unsigned int alarm_hour = 0;
volatile unsigned int alarm_minute = 0;
volatile unsigned char alarm_set = 0;
void rtc_init()
{
// 使用ACLK(32.768kHz)作为时钟源
// 分频器设置为1
RTCCTL01 = RTCMODE + RTCTEVIE;
RTCCTL23 = RTCCALF_0 + RTCBCD + RTCHOLD + RTCBCD + RTCBCD;
RTCYEAR = year;
RTCMON = month;
RTCDAY = day;
RTCDOW = 1;
RTCHOUR = hour;
RTCMIN = minute;
RTCSEC = second;
RTCCTL01 &= ~RTCHOLD;
}
void set_time(unsigned int y, unsigned int m, unsigned int d, unsigned int h, unsigned int min, unsigned int sec)
{
RTCCTL01 |= RTCHOLD;
RTCYEAR = y;
RTCMON = m;
RTCDAY = d;
RTCDOW = 1;
RTCHOUR = h;
RTCMIN = min;
RTCSEC = sec;
RTCCTL01 &= ~RTCHOLD;
}
void set_alarm(unsigned int h, unsigned int min)
{
alarm_hour = h;
alarm_minute = min;
alarm_set = 1;
}
#pragma vector=RTC_VECTOR
__interrupt void RTC_ISR(void)
{
switch(RTCIV)
{
case RTC_RTCOFIFG:
break;
case RTC_RTCTEVIFG:
break;
case RTC_RTCAIFG:
if (alarm_set && RTCHOUR == alarm_hour && RTCMIN == alarm_minute)
{
// 触发闹钟
P1OUT |= LED;
}
break;
case RTC_RT0PSIFG:
break;
case RTC_RT1PSIFG:
break;
case RTC_RTCRDYIFG:
// 更新时间
second = RTCSEC;
minute = RTCMIN;
hour = RTCHOUR;
day = RTCDAY;
month = RTCMON;
year = RTCYEAR;
break;
}
}
int main(void)
{
WDTCTL = WDTPW | WDTHOLD; // 停止看门狗定时器
// 配置LED
P1DIR |= LED;
P1OUT &= ~LED;
// 配置按钮
P1DIR &= ~BTN;
P1REN |= BTN;
P1OUT |= BTN;
// 配置RTC
rtc_init();
__enable_interrupt();
while(1)
{
// 显示时间
printf("%02d:%02d:%02d %02d/%02d/%04d\n", hour, minute, second, month, day, year);
// 检查按钮是否按下
if ((P1IN & BTN) == 0)
{
// 增加一分钟
minute++;
if (minute >= 60)
{
minute = 0;
hour++;
if (hour >= 24)
{
hour = 0;
day++;
if (day > 31)
{
day = 1;
month++;
if (month > 12)
{
month = 1;
year++;
}
}
}
}
set_time(year, month, day, hour, minute, second);
__delay_cycles(100000);
}
__low_power_mode_3();
}
}
```
该代码使用ACLK(32.768kHz)作为时钟源,并使用RTC模块来实现实时时钟功能。在主循环中,首先显示当前时间,然后检查按钮是否按下。如果按钮按下,则增加一分钟,并使用`set_time()`函数将新时间设置为当前时间。如果设置了闹钟并且当前时间与闹钟时间相同,则触发闹钟并点亮LED。最后,使用`__low_power_mode_3()`函数将CPU置于低功耗模式,以最大限度地节省能源。