S3C44B0X RTC调试经验总结

RTC的使用很简单，对寄存器进行初始化，然后读取，最后显示就可以了。只是硬件还有问题，这点花了我一天时间！RTC需要单独供电的，一开始我以为他们直接接到电源上了呢，后来也怀疑过，但是当时可能是太粗心，看错引脚了。后来才找到原来VDDRTC是需要接2.5V电源的。在调试的过程中，软件和硬件都要考虑，都应该检查！

以下是部分源程序：

void Rtc_Init(void)
{

rRTCCON = 0x01; // R/W enable, 1/32768, Normal(merge), No reset

rBCDYEAR = TESTYEAR;
rBCDMON = TESTMONTH;
rBCDDAY = TESTDAY; // SUN:1 MON:2 TUE:3 WED:4 THU:5 FRI:6 SAT:7
rBCDDATE = TESTDATE;
rBCDHOUR = TESTHOUR;
rBCDMIN = TESTMIN;
rBCDSEC = TESTSEC;
rRTCCON=0x00;
}

读取数据

void Read_Rtc(void)
{

rRTCCON = 0x01; // R/W enable, 1/32768, Normal(merge), No reset
while(1)
{
if (rBCDYEAR == 0x99)
{
year = 0x1999;
}
else
{
year = 0x2000 + rBCDYEAR;
}

month = rBCDMON;
day = rBCDDAY;
weekday = rBCDDATE;
hour = rBCDHOUR;
min = rBCDMIN;
sec = rBCDSEC;
if (sec!=0)
break;
}
rRTCCON = 0x00; // R/W disable(for power consumption), 1/32768, Normal(merge), No reset
}

显示函数

void DispYear(int num)
{
char str[5];
char *ch2;

str[0] = num/4096+0x30;
str[1] = (num%4096)/256+0x30;
str[2] = (num%4096)%256/16+0x30;
str[3] = (num%4096)%256%16+0x30;
str[4] = '/0';

ch2=str;
for(;*ch2;ch2++)
Uart0Send(*ch2);

}
void DispNum(int num)
{
char str[3];
char *ch2;

str[0]=num/16+0x30;
str[1]=num%16+0x30;
str[2]='/0';

ch2=str;
for(;*ch2;ch2++)
Uart0Send(*ch2);

}