Отправлено DASM 14 января 2005 г. 18:42 В ответ на: Подскажите где почитать про протокол ds1307 можно? а то что то ничего не могу понять из даташита, совсем что то голова не соображает отправлено nvn 14 января 2005 г. 14:56

#pragma pack (1)
typedef struct  {
	unsigned char sec;
	unsigned char min;
	unsigned char hour;
	unsigned char day;
	unsigned char month;
	unsigned char year;
	unsigned char control;
} ds1307mem;
typedef struct  {
	unsigned char hour;
	unsigned char min;
	unsigned char sec;
} TIME_STR;
#pragma pack ()
extern ds1307mem ds_mem;
extern TIME_STR systime;
void InitDS1307 ();
void ScanDallasProc (void *p);
#define DS1307_ADDR 0xd0
void i2cSendStop()
{
	i2cdelay();	
	SDA_OUT();			
	SDA_0();			
	i2cdelay();	
	SCL_1();
	i2cdelay();	
	SDA_1();	
	i2cdelay();		
}
//
void i2cSendStart()
{
	SDA_OUT();		
	SDA_1();		
	SCL_1();
	i2cdelay();	
	SDA_0();
	i2cdelay();	
	SCL_0();
	i2cdelay();	
}
//
unsigned char i2cSendByte(unsigned char data)
{
	unsigned char i;	
	unsigned char res = 1;
	SDA_OUT();
	i2cdelay();
	for (i = 0; i < 8; i++)
	{	if (data & (1 << 7))
	SDA_1();
	else
		SDA_0();
	i2cdelay();
	SCL_1();
	i2cdelay();
	SCL_0();
	i2cdelay();
	data <<= 1;		
	}
	SDA_IN();
	i2cdelay();
	//ask
	if (GET_SDA())
		res = 0;	
	SCL_1();
	i2cdelay();
	SCL_0();
	i2cdelay();
	return res;
}
//
unsigned char i2cGetByte(char bAsk)
{
	unsigned char i;	
	unsigned char data = 0;
	SDA_IN();
	i2cdelay();
	for (i = 0; i < 8; i++)
	{
		data <<= 1;
		if (GET_SDA())
			data |= 1;				
		SCL_1();
		i2cdelay();		
		SCL_0();		
		i2cdelay();
	}
	if (bAsk)
	{	
		SDA_OUT();		
		SDA_0();
	}
	else {
		SDA_IN();
	}
	//ask
	i2cdelay();
	SCL_1();
	i2cdelay();
	SCL_0();
	i2cdelay();
	return data;	
}
//
void InitDS1307 ()
{
	i2cSendStart();
	i2cSendByte(DS1307_ADDR);
	i2cSendByte (0x0); // CH bit
	i2cSendByte (0x0); // CH bit
	i2cSendStop();
}
void ReadDS1307 (ds1307mem *pmem)
{
	char i;
	unsigned char *p = (unsigned char *)pmem;
	i2cSendStart();
	i2cSendByte(DS1307_ADDR);
	i2cSendByte (0x0); // ser reg pointer
	i2cSendStop();
	i2cSendStart();
	i2cSendByte(DS1307_ADDR + 1); // read
	for (i = 0; i < (sizeof (ds1307mem) - 1); i++)
	{
		*p++ = i2cGetByte(1);
	}
	*p = i2cGetByte(0); // no ask
	i2cSendStop();
}
void WriteDS1307 (ds1307mem *pmem)
{
	char i;
	unsigned char *p = (unsigned char *)pmem;
	i2cSendStart();
	i2cSendByte(DS1307_ADDR);
	i2cSendByte (0x0); // ser reg pointer	
	for (i = 0; i < (sizeof (ds1307mem)); i++)
	{
		i2cSendByte(*p++);
	}	
	i2cSendStop();
}
void ConvertTimeFromDS (TIME_STR *pt, ds1307mem *pmem)
{
	pt->hour = pmem->hour & 0x1f;
	pt->min = 10 * ((pmem->min & 0x70) >> 4) + (pmem->min & 0x0f);
	pt->sec = 10 * ((pmem->sec & 0x70) >> 4) + (pmem->sec & 0x0f);
}
void ConvertTimeToDS (ds1307mem *pmem, TIME_STR *pt)
{
	pmem->hour = pt->hour & 0x1f;
	pmem->min = ((pt->min / 10) << 4)+ pt->min % 10 ;
	pmem->sec = ((pt->sec / 10) << 4)+ pt->min % 10 ;
}