/*
 * 1_Wire.c
 *
 *  Created on: Mar 3, 2011
 *      Author: Mariusz Poslinski
 */
#include"1_Wire.h"

//GPIO_InitTypeDef GPIO_InitStructure;
#include "stm32f10x_conf.h"
#include "stm32f10x_it.h"
//#include "owirelib.h"

int i;
void delay1 (int us)
{

    u16 i, tus;
        tus = 9*us;
        for(i=0;i<tus;i++);
        asm volatile ("nop");
}

unsigned char ow_reset(void)
{
    ow_pin_out();
    u8 presence;
    GPIO_WriteBit(GPIOD, GPIO_Pin_13, Bit_RESET);
    delay1(500); // delay 560uS
    GPIO_WriteBit(GPIOD, GPIO_Pin_13, Bit_SET);
    ow_pin_in();
    delay1(30);

if(GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_13))
    {presence=0;}
    else
    {presence=1;}
    delay1(470);
if(GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_13))
    {presence&=1;}
    else
    {presence&=0;}
    return(presence);

}

unsigned char ow_read_bit(void)
{
    unsigned char presence=0;
    ow_pin_out();
    GPIO_WriteBit(GPIOD, GPIO_Pin_13, Bit_RESET);
    delay1(2);
    GPIO_WriteBit(GPIOD, GPIO_Pin_13, Bit_SET);
    ow_pin_in();
    delay1(13);
    if(GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_13))
    {presence=1;}
    else
    {presence=0;}
    return(presence);
}

void ow_write_bit(unsigned char bitval)
{
    GPIO_WriteBit(GPIOD, GPIO_Pin_13, Bit_RESET);
    delay1(5);
    if(bitval==1)
        GPIO_WriteBit(GPIOD, GPIO_Pin_13, Bit_SET);

        delay1(80);
        GPIO_WriteBit(GPIOD, GPIO_Pin_13, Bit_SET);
}


unsigned char ow_read_byte(void)
{
unsigned char i;
unsigned char value=0;
for (i=0;i<8;i++)
{
if(ow_read_bit()) value |= (0x01<<i);
delay1(15); //was 65
}
return(value);
}

void ow_write_byte(unsigned char val)
{
    unsigned char i;
    unsigned char pom;
    ow_pin_out();
    for(i=0; i<8; i++)
    {
        pom = val>>1;
        pom &= 0x01;
        ow_write_bit(pom);
    }
    delay1(100);
}

void ow_pin_out(void)
{

/* Configure CX_ADC2 as 1-wire port */
   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
   GPIO_Init(GPIOD, &GPIO_InitStructure);
}

void ow_pin_in(void)
{

/* Configure CX_ADC2 as 1-wire port */
   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
   GPIO_Init(GPIOD, &GPIO_InitStructure);
}

void ow_get_rom(unsigned char *romid)
{
    ow_write_byte(0x33);
    for(i = 0; i < 8; i++)
       {
           romid[i] = ow_read_byte();
       }
}