Miscellany

#include <avr/io.h>#include <avr/interrupt.h>#include <stdint.h>#include <avr/sfr_defs.h>#include <util/delay.h>#define F_CPU 4000000#define F_OSC 4000000#define BAUD 9600#define MYUBRR F_OSC/16/BAUD-1#define STOP 0#define RUN 1#define OUTPUT 1#define INPUT 0volatile uint8_t state;volatile uint8_t ledCount = 0;volatile uint8_t switchPressed[10];/* Initialize UART */void USART_Init( unsigned int ubrr ){        /* Set the baud rate */        UBRRH = (unsigned char) (ubrr>>8);        UBRRL = (unsigned char) ubrr;        /* Enable UART receiver and transmitter */        UCSRB = ( ( 1 << RXEN ) | ( 1 << TXEN ) );        //atta databitar, tva stopbitar!        UCSRC = (1<<URSEL)|(1<<USBS)|(3<<UCSZ0);}/* Read and write functions */unsigned char USART_Receive( void ){        /* Wait for incomming data */        while ( !(UCSRA & (1<<RXC)) )                return UDR;}void USART_Transmit( unsigned char data ){        /* Wait for empty transmit buffer */        while ( !(UCSRA & (1<<UDRE)) )                ;        /* Start transmittion */        UDR = data;}void USART_printstring(unsigned char *data){        while(*data) {                USART_Transmit(*data);                data++;        }}void enableAllStops(){        PORTB |=(1<<PB0)|(1<<PB1)|(1<<PB2)|(1<<PB3);}void disableAllStops(){        PORTB &=~(1<<PB0)&~(1<<PB1)&~(1<<PB2)&~(1<<PB3);}void enableRun(){        PORTD |=(1<<PD4);}void disableRun(){        PORTD &=~(1<<PD4);}void enableMCURunning(){        PORTD |=(1<<PD5);}SIGNAL(SIG_OVERFLOW0){        ledCount=1;        //RESET        if(bit_is_set(PINC,PC6) && state==STOP){                //              if(switchPressed[0]==1)                //                      switchPressed[0]==0;                //              else{                enableRun();                disableAllStops();                //PORTD |=(1<<PD4);                state=RUN;                switchPressed[0]=1;                //              }        }        //SW1        if(bit_is_set(PINC,PC5) && state==RUN){                PORTD &=~(1<<PD4);                disableRun();                PORTB |=(1<<PB0);                state=STOP;        }        //SW2        if(bit_is_set(PINA,PA2) && state==RUN){                disableRun();                PORTD |=(1<<PD4);                state=STOP;        }}void initTimer(){        TCNT0 = 0;        TCCR0=0x14;        TIFR = 1<<TOV0;        TIMSK = 1<<TOIE0;}int main(void){        uint8_t i =0;        for(i=0;i<10;i++)                switchPressed[i]=0;        state=STOP;        GICR=0xC0;        //      MCUCR=0x03;        initTimer();        sei();        DDRD |= (OUTPUT<<PD6)|(OUTPUT<<PD5)|(OUTPUT<<PD4)|(OUTPUT<<PD7);        DDRB |= (OUTPUT<<PB0)|(OUTPUT<<PB1)|(OUTPUT<<PB2)|(OUTPUT<<PB3);        DDRA = (INPUT << PA0 | INPUT << PA1 |INPUT << PA2 |INPUT << PA3 |INPUT << PA4 |INPUT << PA5 |INPUT << PA6 |INPUT << PA7);        DDRC = 0x00; //PORTC == INPUT PORT        //      PORTD &=~(1 << PD2);        PORTA = 0x00; //pullup 0  pa alla pinnar        PORTC = 0x00;        //      USART_Init( MYUBRR ); //9600 @ 4Mhz        //      USART_Transmit(0x01);        enableMCURunning();        enableAllStops();        disableRun();        while (1) {                //      USART_Transmit(0x01);                //      _delay_ms(100);        }        return 0;}