Entonces, hay un código que escribí para un proyecto de Clock en el que estoy trabajando y que utiliza un ATMega328P y un DS1307 RTC.
#include <avr/io.h>
#include <stdlib.h>
#include <util/delay.h>
#include <avr/interrupt.h>
#include <util/atomic.h>
typedef unsigned char u8;
typedef signed short s16;
#include "lcd.h"
#include "i2cmaster.h"
#define F_CPU 1000000UL
#define RTC 0xD0
#define KEY_PIN PINB
#define KEY_PORT PORTB
#define KEY_DDR DDRB
#define KEY0 0
#define KEY1 1
#define KEY2 2
#define KEY3 3
u8 key_state; // debounced and inverted key state:
// bit = 1: key pressed
u8 key_press; // key press detect
ISR(TIMER0_OVF_vect)
{
static u8 ct0 = 0xFF, ct1 = 0xFF; // 8 * 2bit counters
u8 i;
i = ~KEY_PIN; // read keys (low active)
i ^= key_state; // key changed ?
ct0 = ~( ct0 & i ); // reset or count ct0
ct1 = ct0 ^ (ct1 & i); // reset or count ct1
i &= ct0 & ct1; // count until roll over ?
key_state ^= i; // then toggle debounced state
key_press |= key_state & i; // 0->1: key press detect
}
u8 get_key_press( u8 key_mask )
{
ATOMIC_BLOCK(ATOMIC_FORCEON){ // read and clear atomic !
key_mask &= key_press; // read key(s)
key_press ^= key_mask; // clear key(s)
}
return key_mask;
}
uint8_t dec_to_bcd(uint8_t dec)
{
uint8_t x;
x = ((dec / 10) << 4) + (dec % 10);
return(x);
}
uint8_t bcd_to_dec(uint8_t bcd)
{
return (((0xF0 & bcd) >> 4)* 10) + (0x0F & bcd);
}
uint8_t set_sec_min() // Set seconds and minutes.
{
uint8_t sec_min;
char buff[4];
while(1) // Set seconds/minutes;
{
lcd_gotoxy(0,0);
itoa(sec_min,buff,10);
lcd_puts(buff);
if( get_key_press( 1<<KEY1 ))
{
sec_min++;
}
if( get_key_press( 1<<KEY2 ))
{
sec_min--;
}
if( get_key_press( 1<<KEY3 ))
{
break;
}
if( sec_min > 59)
{
sec_min =0;
}
}
return(sec_min);
}
void init_timer0()
{
TCCR0B |= (1 << CS01); // set /8 prescaler
TIMSK0 |= (1 << TOIE0); // Enable overflow interrupt.
sei();
}
void set_time()
{
uint8_t seconds;
uint8_t minutes;
uint8_t hours;
uint8_t day;
uint8_t date;
uint8_t month;
uint8_t year;
char buff[5];
while(1)
{
lcd_clrscr();
seconds = set_sec_min();
lcd_clrscr();
minutes = set_sec_min();
lcd_clrscr();
while(1) // Set hours;
{
lcd_gotoxy(0,0);
itoa(hours,buff,10);
lcd_puts(buff);
if( get_key_press( 1<<KEY1 ))
{
hours++;
}
if( get_key_press( 1<<KEY2 ))
{
hours--;
}
if( get_key_press( 1<<KEY3 ))
{
break;
}
if( hours > 12 | hours < 1)
{
hours = 1;
}
}
hours = dec_to_bcd(hours);
hours |= (1 << 6); //Set 12 hour mode
lcd_clrscr();
while(1) // Set AM/PM;
{
lcd_gotoxy(0,0);
if( get_key_press( 1<<KEY1 ) | get_key_press( 1<<KEY2 ) )
{
hours ^= (1 << 5);
}
if( get_key_press( 1<<KEY3 ))
{
break;
}
if(hours & (1 << 5))
{
lcd_puts("PM");
}else
{
lcd_puts("AM");
}
}
lcd_clrscr();
while(1) // Set day;
{
lcd_gotoxy(0,0);
itoa(day,buff,10);
lcd_puts(buff);
if( get_key_press( 1<<KEY1 ))
{
day++;
}
if( get_key_press( 1<<KEY2 ))
{
day--;
}
if( get_key_press( 1<<KEY3 ))
{
break;
}
if( day > 7 | day < 1)
{
day =1;
}
}
lcd_clrscr();
while(1) // Set date;
{
lcd_gotoxy(0,0);
itoa(date,buff,10);
lcd_puts(buff);
if( get_key_press( 1<<KEY1 ))
{
date++;
}
if( get_key_press( 1<<KEY2 ))
{
date--;
}
if( get_key_press( 1<<KEY3 ))
{
break;
}
if( date > 31 | date < 1)
{
date =1;
}
}
lcd_clrscr();
while(1) // Set month;
{
lcd_gotoxy(0,0);
itoa(month,buff,10);
lcd_puts(buff);
if( get_key_press( 1<<KEY1 ))
{
month++;
}
if( get_key_press( 1<<KEY2 ))
{
month--;
}
if( get_key_press( 1<<KEY3 ))
{
break;
}
if( month > 12 | month < 1)
{
month =1;
}
}
lcd_clrscr();
while(1) // Set year;
{
lcd_gotoxy(0,0);
itoa(year,buff,10);
lcd_puts(buff);
if( get_key_press( 1<<KEY1 ))
{
year++;
}
if( get_key_press( 1<<KEY2 ))
{
year--;
}
if( get_key_press( 1<<KEY3 ))
{
break;
}
if( year > 99)
{
year =0;
}
}
break;
}
i2c_init();
i2c_start_wait(RTC+I2C_WRITE);
i2c_write(0x00); // First register address; the RTC increments the register pointer after every byte write.
i2c_write(dec_to_bcd(seconds)); // Write seconds.
i2c_write(dec_to_bcd(minutes)); // Write minutes.
i2c_write(hours); // Write hours.
i2c_write(day); // Write days.
i2c_write(dec_to_bcd(date)); // Write date.
i2c_write(dec_to_bcd(month)); // Write month.
i2c_write(dec_to_bcd(year)); // Write year.
i2c_stop();
}
void display_time()
{
uint8_t ret;
char buff[4];
char monthNames[][4] = {"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};
char dayNames[][4] = {"Mon","Tue","Wed","Thu","Fri","Sat","Sun"};
i2c_start_wait(RTC+I2C_WRITE); // Establish communication
i2c_write(0x00); // Write Address of first register.
i2c_rep_start(RTC+I2C_READ); // Re-establish comm with READ mode.
//************** PRINT SECONDS ************************
ret = i2c_readAck();
ret = bcd_to_dec(ret);
itoa(ret,buff,10);
if(ret > 9)
{
lcd_gotoxy(6,0);
lcd_puts(buff);
}else if(ret == 0)
{
lcd_gotoxy(6,0);
lcd_puts("00");
}
else{
lcd_gotoxy(7,0);
lcd_puts(buff);
}
//*****************************************************
//************** PRINT MINUTES ************************
ret = i2c_readAck();
ret = bcd_to_dec(ret);
itoa(ret,buff,10);
if( ret > 9)
{
lcd_gotoxy(3,0);
lcd_puts(buff);
}else if(ret == 0)
{
lcd_gotoxy(3,0);
lcd_puts("00");
}
else{
lcd_gotoxy(4,0);
lcd_puts(buff);
}
//*****************************************************
//************** PRINT HOURS ************************
ret = i2c_readAck();
if( ret & (1 << 5))
{
lcd_gotoxy(9,0);
lcd_puts("PM");
}else
{
lcd_gotoxy(9,0);
lcd_puts("AM");
}
ret = (((0x10 & ret) >> 4)* 10) + (0x0F & ret);
itoa(ret,buff,10);
lcd_gotoxy(0,1);
if( ret > 9)
{
lcd_gotoxy(0,0);
lcd_puts(buff);
}else
{
lcd_gotoxy(0,0);
lcd_puts("0");
lcd_gotoxy(1,0);
lcd_puts(buff);
}
//*****************************************************
//************** PRINT DAY ****************************
ret = i2c_readAck();
lcd_gotoxy(0,1);
ret--;
lcd_puts(dayNames[ret]);
//******************************************************
//************** PRINT DATE ****************************
ret = i2c_readAck();
ret = (((0x10 & ret) >> 4)* 10) + (0x0F & ret);
itoa(ret,buff,10);
if(ret > 9)
{
lcd_gotoxy(4,1);
lcd_puts(buff);
}else
{
lcd_gotoxy(4,1);
lcd_putc('0');
lcd_gotoxy(5,1);
lcd_puts(buff);
}
//*******************************************************
//************** PRINT Month ****************************
ret = i2c_readAck();
ret = (((0x10 & ret) >> 4)* 10) + (0x0F & ret);
lcd_gotoxy(7,1);
ret--;
lcd_puts(monthNames[ret]);
//*****************************************************
//************** PRINT Year ****************************
ret = i2c_readNak();
i2c_stop();
ret = bcd_to_dec(ret);
itoa(ret,buff,10);
lcd_gotoxy(11,1);
lcd_puts("20");
lcd_puts(buff);
//*****************************************************
}
int main(void)
{
init_timer0();
KEY_DDR = 0; // input
KEY_PORT = 0xFF; // pullups on
lcd_init(LCD_DISP_ON);
lcd_home();
while (1)
{
if( get_key_press( 1<<KEY0 ))
{
set_time();
}
display_time();
}
}
Lo que pasa es que ahora quiero poder optimizar el código. Como puede ver en la función set_time (), se repite la acción de incremento / decremento. ¿Hay alguna manera de que pueda escribir una función para esto y usarla cuando lo necesite? Tenga en cuenta que cada una de las variables tiene un límite diferente después del cual se restablece / ajusta.