Figure 1: Program Listing
/***************************************************************************/
/* DEMO1302.C */
/***************************************************************************/
/* This program is for example only and is not supported by Dallas Maxim */
#include <stdio.h>
#include <DS5000.h> /* Register declarations for DS5000 */
sbit CE = P0^0;
sbit SCLK = P0^1;
sbit IO = P0^2;
/***************************************************************************/
/* Prototypes */
/***************************************************************************/
uchar rbyte_3w();
void reset_3w();
void wbyte_3w(uchar);
void writebyte();
void write_clk_regs();
void read_clk_regs();
void burstramrd();
void burstramwr();
/***************************************************************************/
void reset_3w() /* ----- reset and enable the 3-wire interface ------ */
{
SCLK = 0;
CE = 0;
CE = 1;
}
void wbyte_3w(uchar W_Byte) /* ------ write one byte to the device ------- */
{
uchar i;
for(i = 0; i < 8; ++i)
{
IO = 0;
if(W_Byte & 0x01)
{
IO = 1; /* set port pin high to read data */
}
SCLK = 0;
SCLK = 1;
W_Byte >>= 1;
}
}
uchar rbyte_3w() /* ------- read one byte from the device -------- */
{
uchar i;
uchar R_Byte;
uchar TmpByte;
R_Byte = 0x00;
IO = 1;
for(i = 0; i < 8; i++)
{
SCLK = 1;
SCLK = 0;
TmpByte = (uchar)IO;
TmpByte <<= 7;
R_Byte >>= 1;
R_Byte |= TmpByte;
}
return R_Byte;
}
void writebyte() /* --- write one byte using values entered by user --- */
{
uchar ClkAdd;
uchar ClkData;
/* Get Clock Address & Data */
printf("\nEnter register write address (hex): ");
scanf("%bx", &ClkAdd);
printf("Enter data (hex): ");
scanf("%bx", &ClkData);
reset_3w();
wbyte_3w(ClkAdd);
wbyte_3w(ClkData);
reset_3w();
}
void read_clk_regs() /* ---- loop read & display clock registers ---- */
{
uchar prev_sec = 99, sec, min, hrs, dte, mon, day, yr;
printf("\nYr/Mn/Dt Dy Hr/Mn/Sec");
do /* Read & Display Clock Registers */
{
reset_3w();
wbyte_3w(0xBF); /* clock burst */
sec = rbyte_3w();
min = rbyte_3w();
hrs = rbyte_3w();
dte = rbyte_3w();
mon = rbyte_3w();
day = rbyte_3w();
yr = rbyte_3w();
reset_3w();
if(sec != prev_sec) /* print once per second */
{
printf("\n%02bX/%02bX/%02bX %02bX", yr, dte, mon, day);
printf(" %02bX:%02bX:%02bX", hrs, min, sec);
prev_sec = sec;
}
} while(!RI);
RI = 0; /* clear read buffer */
}
void burstramrd() /* ----------- read RAM in burst mode --------------- */
{
uchar i;
printf("\nDS1302 Ram");
reset_3w();
wbyte_3w(0xFF); /* RAM burst read */
for (i = 0; i < 31; i++)
{
if(!(i % 8)) printf("\n");
printf("%2.bX ", rbyte_3w() );
}
reset_3w();
}
void burstramwr() /* ---- write one value entire RAM in burst mode ---- */
{
uchar ramdata;
uchar i;
printf("\nWrite Ram DATA (HEX):"); /* Get Ram Data */
scanf("%bx", &ramdata);
reset_3w();
wbyte_3w(0xfe); /* RAM burst write */
for (i=0; i<31; ++i)
{
wbyte_3w(ramdata);
}
reset_3w();
}
void write_clk_regs() /* --- initialize time & date from user entries --- */
/* Note: NO error checking is done on the user entries! */
{
uchar yr, mn, date, dy, hr, min, sec, day;
printf("\nEnter the year (0-99): ");
scanf("%bx", &yr);
printf("Enter the month (1-12): ");
scanf("%bx", &mn);
printf("Enter the date (1-31): ");
scanf("%bx", &date);
printf("Enter the day (1-7): ");
scanf("%bx", &dy);
printf("Enter the hour (1-24): ");
scanf("%bx", &hr);
hr = hr & 0x3f; /* force clock to 24 hour mode */
printf("Enter the minute (0-59): ");
scanf("%bx", &min);
printf("Enter the second (0-59): ");
scanf("%bx", &sec);
reset_3w();
wbyte_3w(0x8e); /* control register */
wbyte_3w(0); /* disable write protect */
reset_3w();
wbyte_3w(0x90); /* trickle charger register */
wbyte_3w(0xab); /* enable, 2 diodes, 8K resistor */
reset_3w();
wbyte_3w(0xbe); /* clock burst write (eight registers) */
wbyte_3w(sec);
wbyte_3w(min);
wbyte_3w(hr);
wbyte_3w(date);
wbyte_3w(mn);
wbyte_3w(dy);
wbyte_3w(yr);
wbyte_3w(0); /* must write control register in burst mode */
reset_3w();
}
main (void) /* ---------------------------------------------- */
{
uchar M, M1;
while (1)
{
printf("\nDS1302 build: %s\n", __DATE__);
printf("CW Clock Write CR Clock Read\n");
printf("RW RAM Write RR RAM Read\n");
printf("W Write byte\n");
printf("Enter Menu Selection: ");
M = _getkey();
switch(M)
{
case 'C':
case 'c':
printf("\rEnter Clock Routine to run:C");
M1 = _getkey();
switch(M1)
{
case 'R':
case 'r': read_clk_regs(); break;
case 'W':
case 'w': write_clk_regs(); break;
}
break;
case 'R':
case 'r':
printf("\rEnter Ram Routine to run:R");
M1 = _getkey();
switch(M1)
{
case 'R':
case 'r': burstramrd(); break;
case 'W':
case 'w': burstramwr(); break;
}
break;
case 'W':
case 'w': writebyte(); break;
}
}
}
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