📄 xtest16_3.c
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/* ========================================================================== */
/* Xtest16_3.c : Digital Clock with Calendar on Text LCD by DS1307 RTC */
/* ========================================================================== */
/* Designed and programmed by Duck-Yong Yoon in 2007. */
#include "AT91SAM7S256.h"
#include "lib_AT91SAM7S256.h"
#include "OK7S256ads.h"
unsigned int year, month, date, weekday; // time variable
unsigned int second, minute, hour, ampm, cursor;
void LCD_2BCD(unsigned int number) /* display 2-digit BCD number */
{
LCD_data((number >> 4) + '0'); // 10^1
LCD_data((number & 0x0F) + '0'); // 10^0
}
unsigned int BCD_increment(unsigned int number) /* BCD increment */
{ unsigned int i;
i = (number >> 4)*10 + (number & 0x0F); // convert BCD to binary
i++; // incrment
i = ((i/10) << 4) + (i % 10); // convert binary to BCD
return i;
}
void TWI_transmit(unsigned int address, unsigned int data) /* transmit by TWI */
{
*AT91C_TWI_MMR = 0x00680100; // master write, device address 1 byte
*AT91C_TWI_IADR = address; // device address
*AT91C_TWI_CR = AT91C_TWI_MSEN|AT91C_TWI_STOP|AT91C_TWI_START; // control register
*AT91C_TWI_THR = data; // start transmission
while(!(*AT91C_TWI_SR & AT91C_TWI_TXCOMP)); // complete?(TXCOMP=1)
}
unsigned int TWI_receive(unsigned int address) /* receive by TWI */
{
*AT91C_TWI_MMR = 0x00681100; // master read, device address 1 byte
*AT91C_TWI_IADR = address; // device address
*AT91C_TWI_CR = AT91C_TWI_MSEN|AT91C_TWI_STOP|AT91C_TWI_START; // control register
while(!(*AT91C_TWI_SR & AT91C_TWI_TXCOMP)); // complete?(TXCOMP=1)
return *AT91C_TWI_RHR; // read received data and return
}
void RTC_check(void) /* check if DS1307 RTC is OK */
{ unsigned int RTC_flag;
RTC_flag = 0; // initial flag
if(TWI_receive(0x00) == 0x00) // if second = 0x00, not OK
RTC_flag = 1;
else if(TWI_receive(0x00) > 0x59) // if second > 0x59, not OK
RTC_flag = 1;
else if(TWI_receive(0x01) == 0x00) // if minute = 0x00, not OK
RTC_flag = 1;
else if(TWI_receive(0x01) > 0x59) // if minute > 0x59, not OK
RTC_flag = 1;
else if((TWI_receive(0x02) & 0x9F) == 0x00) // if hour = 0x00, not OK
RTC_flag = 1;
else if((TWI_receive(0x02) & 0x40) == 0x00)
RTC_flag = 1;
else if((TWI_receive(0x02) & 0x9F) > 0x12) // if hour > 0x12, not OK
RTC_flag = 1;
else if(TWI_receive(0x03) == 0x00) // if week = 0x00, not OK
RTC_flag = 1;
else if(TWI_receive(0x03) > 0x07) // if week > 0x07, not OK
RTC_flag = 1;
else if(TWI_receive(0x04) == 0x00) // if date = 0x00, not OK
RTC_flag = 1;
else if(TWI_receive(0x04) > 0x31) // if date > 0x31, not OK
RTC_flag = 1;
else if(TWI_receive(0x05) == 0x00) // if month = 0x00, not OK
RTC_flag = 1;
else if(TWI_receive(0x05) > 0x12) // if month > 0x12, not OK
RTC_flag = 1;
else if(TWI_receive(0x06) > 0x99) // if year > 0x99, not OK
RTC_flag = 1;
if(RTC_flag != 0)
{ TWI_transmit(0x00, 0x00); // innitialize DS1307 RTC
TWI_transmit(0x01, 0x00); // (2007/06/01 FRI 12:00:00 AM)
TWI_transmit(0x02, 0x12 | 0x40);
TWI_transmit(0x03, 0x06);
TWI_transmit(0x04, 0x01);
TWI_transmit(0x05, 0x06);
TWI_transmit(0x06, 0x07);
TWI_transmit(0x07, 0x00); // (control register = 0x00)
}
}
void RTC_display(void) /* display clock from RTC */
{
LCD_command(0x0C); // cursor OFF
year = TWI_receive(0x06); // display year
LCD_command(0x83); LCD_2BCD(year);
month = TWI_receive(0x05); // display month
LCD_command(0x86); LCD_2BCD(month);
date = TWI_receive(0x04); // display date
LCD_command(0x89); LCD_2BCD(date);
weekday = TWI_receive(0x03); // display weekday
if(weekday == 1) LCD_string(0x8C,"SUN");
else if(weekday == 2) LCD_string(0x8C,"MON");
else if(weekday == 3) LCD_string(0x8C,"TUE");
else if(weekday == 4) LCD_string(0x8C,"WED");
else if(weekday == 5) LCD_string(0x8C,"THU");
else if(weekday == 6) LCD_string(0x8C,"FRI");
else LCD_string(0x8C,"SAT");
hour = TWI_receive(0x02) & 0x3F; // display hour
if(hour > 0x20) { hour &= 0x1F; ampm = 'P';}
else ampm = 'A';
LCD_command(0xC2); LCD_2BCD(hour);
LCD_command(0xCB); LCD_data(ampm); // display AM/PM
minute = TWI_receive(0x01); // display minute
LCD_command(0xC5); LCD_2BCD(minute);
second = TWI_receive(0x00); // display second
LCD_command(0xC8); LCD_2BCD(second);
LCD_command(cursor); // go cursor position
LCD_command(0x0F); // cursor ON
Delay_ms(10); // time delay for cursor
if((minute == 0x00) && (second == 0x00)) // beep for each o'clock
{ Beep();
Delay_ms(1000);
}
}
void Cursor_left(void) /* go cursor left */
{
if(cursor == 0xCF) cursor = 0xCC;
else if(cursor == 0xCC) cursor = 0xC9;
else if(cursor == 0xC9) cursor = 0xC6;
else if(cursor == 0xC6) cursor = 0xC3;
else if(cursor == 0xC3) cursor = 0x8E;
else if(cursor == 0x8E) cursor = 0x8A;
else if(cursor == 0x8A) cursor = 0x87;
else if(cursor == 0x87) cursor = 0x84;
else if(cursor == 0x84) cursor = 0xCF;
}
void Increment(void) /* increment time */
{
switch(cursor)
{ case 0x84 : year = TWI_receive(0x06); // in case of year
if(year == 0x99) year = 0x00;
else year = BCD_increment(year);
TWI_transmit(0x06, year);
break;
case 0x87 : month = TWI_receive(0x05); // in case of month
if(month == 0x12) month = 0x01;
else month = BCD_increment(month);
TWI_transmit(0x05, month);
break;
case 0x8A : date = TWI_receive(0x04); // in case of date
if(date == 0x31) date = 0x01;
else date = BCD_increment(date);
TWI_transmit(0x04, date);
break;
case 0x8E : weekday = TWI_receive(0x03); // in case of weekday
if(weekday == 0x07) weekday = 0x01;
else weekday++;
TWI_transmit(0x03, weekday);
break;
case 0xC3 : hour = TWI_receive(0x02) & 0x3F; // in case of hour
if(hour == 0x12) hour = 0x01;
else if(hour == 0x32) hour = 0x21;
else hour = BCD_increment(hour);
TWI_transmit(0x02, hour | 0x40);
break;
case 0xC6 : minute = TWI_receive(0x01); // in case of minute
if(minute == 0x59) minute = 0x00;
else minute = BCD_increment(minute);
TWI_transmit(0x01, minute);
break;
case 0xC9 : second = TWI_receive(0x00); // in case of second
if(second == 0x59) second = 0x00;
else second = BCD_increment(second);
TWI_transmit(0x00, second);
break;
case 0xCC : hour = TWI_receive(0x02); // in case of AM/PM
if((hour & 0x20) == 0x20) hour &= 0xDF;
else hour |= 0x20;
TWI_transmit(0x02, hour);
break;
default : break;
}
}
int main(void)
{
MCU_initialize(); // initialize AT91SAM7S256 & kit
Delay_ms(50); // wait for system stabilization
LCD_initialize(); // initialize text LCD module
LCD_string(0x80," 2007/06/01 FRI "); // display title
LCD_string(0xC0," 12:00:00 AM ");
Beep();
LCD_command(0x0F); // cursor ON
cursor = 0xCF; // initial cursor position
AT91F_TWI_CfgPIO(); // enable TWD, TWCK pin
AT91F_PIO_Opendrain(AT91C_BASE_PIOA,AT91C_PA4_TWCK|AT91C_PA3_TWD); // open drain
AT91F_TWI_CfgPMC(); // enable peripheral clock for TWI
AT91F_TWI_Configure(AT91C_BASE_TWI); // TWI master mode
*AT91C_TWI_CWGR = 0x00023B3B; // about 100kHz
RTC_check(); // check the status of DS1307 RTC
while(1)
{ RTC_display(); // display clock
switch(Key_input()) // key input
{ case 0x01 : Increment(); // if KEY1, increment time
break;
case 0x02 : Cursor_left(); // if KEY2, go cursor left
break;
default : break;
}
}
}
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