#include <avr/interrupt.h>
#include <avr/signal.h>
#include <util/delay.h>
#include "DS18B20.h"

void DS18B20_Reset(void);
void DS18B20_Write0(void);
void DS18B20_Write1(void);
void DS18B20_WriteByte(char cByte);
static unsigned char DS18B20_ReadByte(void);
void USART_vInit(void);
void USART_vSetUBBR(char cUBBRVal,char bDelay);
void USART_vSendByte(char u8Data);
static unsigned char OWByte(unsigned char b);
static unsigned char OWReset(void);

int main(void) {
    USART_vInit();
    DS18B20_Reset();
    DS18B20_WriteByte(0x33);
    unsigned char c1,c2,c3,c4,c5,c6,c7,c8;
    c1=DS18B20_ReadByte();
    c2=DS18B20_ReadByte();
    c3=DS18B20_ReadByte();
    c4=DS18B20_ReadByte();
    c5=DS18B20_ReadByte();
    c6=DS18B20_ReadByte();
    c7=DS18B20_ReadByte();
    c8=DS18B20_ReadByte();
    USART_vSetUBBR(25,1);
    USART_vSendByte(c1);
    USART_vSendByte(c2);
    USART_vSendByte(c3);
    USART_vSendByte(c4);
    USART_vSendByte(c5);
    USART_vSendByte(c6);
    USART_vSendByte(c7);
    USART_vSendByte(c8);
    USART_vSetUBBR(1,1);
    while (1);
    return 0;
}

void DS18B20_Reset(void) {
    USART_vSetUBBR(25,0);
    USART_vSendByte(0xF0);
    _delay_ms(1);
    while (!(UCSRA&(1<<TXC)));
    while (!(UCSRA&(1<<RXC)));
    USART_vSetUBBR(1,1);
}

void DS18B20_Write0(void) {
    USART_vSendByte(0x00);
}

void DS18B20_Write1(void) {
    USART_vSendByte(0xFF);
}

void DS18B20_WriteByte(char cByte) {
    for (char i=0;i<8;i++) {
        if (cByte%2) DS18B20_Write1();
        else DS18B20_Write0();
        cByte=cByte/2;
    }    
    _delay_ms(1);
}

static unsigned char DS18B20_ReadByte(void) {
    unsigned char cByte=0;
    for (char i=0;i<8;i++) {
        UDR=0xFF;    
        UCSRA=(1<<TXC);    
        while(!(UCSRA&(1<<TXC)));
        cByte>>=1;
        if (UDR>0xFE) cByte|=128;
    }    
    return cByte&255;
}

void USART_vInit(void) {
    USART_vSetUBBR(1,0);
    UCSRC = (1<<URSEL)|(0<<USBS)|(3<<UCSZ0);
    UCSRB = (1<<RXEN)|(1<<TXEN);
}

void USART_vSetUBBR(char cUBBRVal,char bDelay) {
    if (bDelay)    {
        _delay_ms(1);
        while (!(UCSRA&(1<<TXC)));
    }
    UBRRH = 0;
    UBRRL = cUBBRVal; // 1-115200, 25-9600
}

void USART_vSendByte(char u8Data) {
    while (!(UCSRA&(1<<UDRE)));
    UDR = u8Data;
}