#include "reg51.h"
#include "intrins.h"
TypedEfunsignedCharbyte;
sbitSCLK = P1 ^ 0; // DS1302 clock port P1.0
sbitIO = P1 ^ 1; // DS1302 data port P1.1
sbitRST = P1 ^ 2; // DS1302 chip select port P1.2
// second day Monday in sharing
BYTEcodeinit [] = {0x00,0x00,0x20,0x01,0x01,0x05,0x10};
BYTEdatanow [7];
voidDS1302_Initial ();
voidDS1302_SetTime (BYTE * p);
voidDS1302_GetTime (BYTE * p);
voidmain ()
{
DS1302_Initial (); // initialize DS1302
DS1302_SetTime (init); // set the initial time
DS1302_GetTime (now); // read the current time
While (1);
}
/ **********************************************
Delay of X microseconds (STC12C5A60S2 @ 12M)
Different working environment, this function needs to be adjusted
This delay function is used to calculate the instruction cycle of 1T, and different from the conventional MCU 12T
*********************************************** /
voidDelay ()
{
_nop_();
_nop_();
}
/ **********************************************
1-byte data read from DS1302
*********************************************** /
BYTEDS1302_ReadByte ()
{
BYTEI;
BYTEdat = 0;
for (i = 0;. i.1882 = 1; // data to the right one
if (IO) dat | = 0x80; // read data
SCLK = 1; // clock line pulled
Delay (); // delay waiting for
}
returndat;
}
/ **********************************************
1-byte write data to the DS1302
*********************************************** /
voidDS1302_WriteByte (BYTEdat)
{
chari;
for (i = 0;. i.1882 = 1; // move-out data
IO = CY; // sent to the port
SCLK = 1; // clock line pulled
Delay (); // delay waiting for
}
}
/ **********************************************
Read data to an address of the DS1302
*********************************************** /
BYTEDS1302_ReadData (BYTEaddr)
{
BYTEdat;
RST = 0;
Delay ();
SCLK = 0;
Delay ();
RST = 1;
Delay ();
DS1302_WriteByte (addr); // write address
dat = DS1302_ReadByte (); // read data
SCLK = 1;
RST = 0;
returndat;
}
/ **********************************************
Write data to an address of DS1302
*********************************************** /
voidDS1302_WritEDAta (BYTEaddr, BYTEdat)
{
RST = 0;
Delay ();
SCLK = 0;
Delay ();
RST = 1;
Delay ();
DS1302_WriteByte (addr); // write address
DS1302_WriteByte (dat); // write data
SCLK = 1;
RST = 0;
}
/ **********************************************
Write the initial time
*********************************************** /
voidDS1302_SetTime (BYTE * p)
{
BYTEaddr = 0x80;
BYTEn = 7;
DS1302_WriteData (0x8e, 0x00); // allow a write operation
while (n--)
{
DS1302_WriteData (addr, * p ++);
addr + = 2;
}
DS1302_WriteData (0x8e, 0x80); // write protection
}
/ **********************************************
Read the current time
*********************************************** /
voidDS1302_GetTime (BYTE * p)
{
BYTEaddr = 0x81;
BYTEn = 7;
while (n--)
{
* P ++ = DS1302_ReadData (addr);
addr + = 2;
}
}
/ **********************************************
Initialization DS1302
*********************************************** /
voidDS1302_Initial ()
{
RST = 0;
SCLK = 0;
DS1302_WriteData (0x8e, 0x00); // allow a write operation
DS1302_WriteData (0x80,0x00); // clock starts
DS1302_WriteData (0x90,0xa6); // a resistance of the charging diode + 4K
DS1302_WriteData (0x8e, 0x80); // write protection
}, Read the full text
Our other product:
