rtc.c

940时钟程序

#include "RTC.h"

volatile UINT currentYear;
volatile UINT currentMonth;
volatile UINT currentDay;
volatile UINT currentHour;
volatile UINT currentMinute;
volatile UINT currentSecond;


void ReadR2025(void)
{
	BYTE ReadData[4];
	
	I2C_ReceiveData(RTC2025_IIC_ADDRESS_R, ReadData, 4);
	printf("ConReg1: 0x%X",ReadData[0]);
	printf("Second: %d",  BCDToDec(ReadData[1]));
	printf("Minute: %d",  BCDToDec(ReadData[2]));
	printf("Hour  : %d\n",  BCDToDec(ReadData[3]));
}

BYTE BCDToDec(BYTE bcd_number)
{
	return((bcd_number>>4)*10 + (bcd_number&0x0f));
}

BYTE DECToBCD(BYTE dec_number)
{
	return(((dec_number/10)<<4) | (dec_number%10));
}


 /*****************************************************
 *   Actual RTC functions                             *
 *****************************************************/
	
/* setup RTC R2025S/D control register */	
/* format: Write_Address, Internal_Pointer, ConReg1, ConReg2*/
/*  call: PowerONSetRTCReg(0x20,0x10); is OK!!!!!!!  */

void PowerONSetRTCReg(BYTE ConReg1, BYTE ConReg2)
{
	BYTE WirteData[3];
	
	WirteData[0] = INTERNAL_POINTER_ADDRESS;
	WirteData[1] = ConReg1;
	WirteData[2] = ConReg2;
	I2C_SendDataNoStop(RTC2025_IIC_ADDRESS_W, WirteData, sizeof(WirteData));
}

/* IIC format:Write_Address, Internal_Poniter, re-Start, Read_Address, second, minute, hour*/
void GetSysTime(void)
{
	BYTE WirteData[1];
	BYTE ReadData[3];
	
	WirteData[0] = READ_CUR_TIME_ADDRESS;
	I2C_SendDataNoStop(RTC2025_IIC_ADDRESS_W, WirteData, sizeof(WirteData));
	I2C_ReceiveData(RTC2025_IIC_ADDRESS_R, ReadData, sizeof(ReadData));

	currentSecond = BCDToDec(ReadData[0]);
	currentMinute = BCDToDec(ReadData[1]);
	currentHour   = BCDToDec(ReadData[2]);
	
	#ifdef TO_DEBUG_CUR_TIME
	PrintCurTime();
	#endif
}

#ifdef TO_DEBUG_CUR_TIME
void PrintCurTime(void)
{
	printf("H:%2d",   currentHour);
	printf("M:%2d",   currentMinute);
	printf("S:%2d\n", currentSecond);
}

void PrintCurDate(void)
{
	printf("Y:%2d",   currentYear);
	printf("M:%2d",   currentMonth);
	printf("D:%2d\n", currentDay);
}
#endif

/*  notice: entry parameters are DECIMAL */
void SetSysTime(UINT hours,UINT minutes,UINT seconds)
{
	BYTE WirteData[4];
	
	WirteData[0] = WIRTE_TIME_ADDRESS;
	WirteData[1] = DECToBCD(seconds);
	WirteData[2] = DECToBCD(minutes);
	WirteData[3] = DECToBCD(hours);
	I2C_SendDataNoStop(RTC2025_IIC_ADDRESS_W, WirteData, sizeof(WirteData));
}

void GetSysDate(void)
{
	BYTE WirteData[1];
	BYTE ReadData[3];
	
	WirteData[0] = READ_CUR_DATE_ADDRESS;
	I2C_SendDataNoStop(RTC2025_IIC_ADDRESS_W, WirteData, sizeof(WirteData));
	I2C_ReceiveData(RTC2025_IIC_ADDRESS_R, ReadData, sizeof(ReadData));
	
	currentDay   = BCDToDec(ReadData[0]);
	currentMonth = BCDToDec(ReadData[1]&0x1F);
	currentYear  = BCDToDec(ReadData[2]);
	
	#ifdef TO_DEBUG_CUR_TIME
	PrintCurDate();
	#endif
}

/*  notice: entry parameters are DECIMAL */
void SetSysDate(UINT years,UINT months,UINT days)
{
	BYTE WirteData[4];
	
	WirteData[0] = WIRTE_DATE_ADDRESS;
	WirteData[1] = DECToBCD(days);
	WirteData[2] = DECToBCD(months&0x1F);
	WirteData[3] = DECToBCD(years);
	I2C_SendDataNoStop(RTC2025_IIC_ADDRESS_W, WirteData, sizeof(WirteData));
}