Electronic time switch on the microcontroller

# include < mega8.h>
# include
struct Stime
{
unsigned char second;
unsigned char minute;
unsigned char hour;
} Time [ 3] ;
void TimerEvent ()
{
PORTB.4 = 1 ;
}
unsigned char Zminute = 0 , Zhour = 0 ;
unsigned char chislo [ 4] ; / / define an array of two elements of type char is unsigned (unsigned)
unsigned char numder [] = / / define an array in which the index will match biti on port D
{
0b11111100, / / '0
0b01100000, / / number 1
0b11011010, / / number 2
0b11110010, / / number 3
0b01100110, / / number 4
0b10110110, / / number 5
0b10111110, / / number 6
0b11100000, / / number 7
0b11111110, / / figure 8
0b11110110, / / number 9
};
void out (unsigned char hour, unsigned char minute)
{
/ * first, we need to determine how many of the tens and units is outputted number .
For example, we passed "45" , we need to expand it to 4 and 5 to the first rank semisegmentnika
4 digit display , and the second - 5 * /
chislo [ 1 ] = hour% 10; / / % operator yields the remainder of the integer division , eg 34% of 10 is 4
chislo [ 0 ] = hour/10; / / Find out how many tens including

chislo [ 3 ] = minute% 10 ;
chislo [ 2 ] = minute/10;
}
unsigned char i = 0 ; / / Variable to determine at what rank semisegmentnika output by
/ / Overflow interrupt timer0
interrupt [TIM0_OVF] void timer0_ovf_isr (void)
{
PORTD = numder [chislo [i]];
if (i == 1 ) PORTD.0 = 1 ; else PORTD.0 = 0 ; / / enable / disable point
PORTB = ((PORTB & 0b11110000) | ((~ ( 1 << i)) & 0b00001111)); / / include certain rank semisegmentnika
if (+ + i> 3 ) i = 0 ;
}
/ * Interrupt taymera2 called 1/second because TIMER2 clocks from time to 32,768 Hertz quartz
and set the timer prescaler frequency 128 means that 128 is considered as one of measures toest
quartz in us 32768
We timer 8 bit maksimalnoe number 255
We choose predelitel 128
turns 32768/128 = 255 , this means that for an intrinsic schetayu second timer (TCNT2) reaches 255 and the timer interrupt zgeneriruet
overflow variable
* /
unsigned char outMenu = 0 ;
interrupt [TIM2_OVF] void timer2_ovf_isr (void)
{
if (time [ 0 ]. second + + == 60 )
{
time [ 0 ]. second = 0 ;
if (time [ 0 ]. minute + + == 60 )
{
time [ 0 ]. minute = 0 ;
if (time [ 0 ]. hour + + == 24)
{
time [ 0 ]. hour = 0 ;

}
}
out (time [outMenu]. hour, time [outMenu]. minute);
if ((time [ 0 ]. minute == Zminute) && (time [ 0 ]. hour == Zhour)) TimerEvent (); / / if the minutes and seconds are jobs call the TimerEvent
}
}

void main (void)
{
PORTB = 0x00;
DDRB = 0x1F;

PORTD = 0x00;
DDRD = 0b11111111;

TCCR0 = 0x00;
TCNT0 = 0x00;

/ / Timer / Counter 0 initialization
/ / Clock source: System Clock
/ / Clock value: 0,977 kHz
TCCR0 = 0x04;
TCNT0 = 0x00;
/ / Timer / Counter 2 initialization
/ / Clock source: TOSC1 pin
/ / Clock value: PCK2/128
/ / Mode: Normal top = FFh
/ / OC2 output: Disconnected
ASSR = 0x08;
TCCR2 = 0x05;
TCNT2 = 0x00;
OCR2 = 0x00;

/ / Timer (s) / Counter (s) Interrupt (s) initialization
TIMSK = 0x41;

/ / Global enable interrupts
# asm ("sei")

while ( 1 )
{
if (! (PINC & 0b00000001) && outMenu> 0) / / check if you pressed 1
{
if (regim = true) time [outMenu]. hour + +; else time [outMenu]. minute + +;
}
if (! (PINC & 0b00000010)) / / check if you pressed 2
{
if (+ + outMenu> 2 ) outMenu = 0 ;
}
if (! (PINC & 0b00000100) && outMenu> 0) / / check if you pressed 3
{
if (regim = true) time [outMenu]. hour -; else time [outMenu]. minute -;
}
delay_ms ( 200 );

out (time [outMenu]. hour, time [outMenu]. minute);
};

}

Electronic time switch on the microcontroller

Добавить комментарий