File content as of revision 14:2d0b5e0f0aed:

#include "iButton.h"

extern Serial dbg;

iButton::iButton(PinName IO) : io(IO)
{
}

iButton::~iButton()
{
}

void iButton::OneWireReset(void)
{
    io.output();
    io = 0;
    wait_us(500);
    io.input();
    wait_us(500);
}

void iButton::OneWireOutByte(unsigned char data)
{
    for (int n = 8;n!=0; n--)
    {
        if ((data & 0x01) == 1)
        {
            io.output();
            io = 0;
            wait_us(5);
            io.input();
            wait_us(60);
        }
        else 
        {
            io.output();
            wait_us(60);
            io.input();
        }
        data = data >> 1;
    }
}

unsigned char iButton::OneWireReadByte(void)
{
    unsigned char d = 0;
    unsigned char b;
    for (int n = 0; n<8; n++)
    {
        io.output();
        io = 0;
        wait_us(5);
        io.input();
        wait_us(5);
        b = io;
        wait_us(50);
        d = (d >> 1) | (b << 7);
    }
    return d;
}

void iButton::ResetData()
{
    detect.family = 0;
    detect.serial.clear();
    detect.crc = 0;
    detect.valid = false;
}

void iButton::DetectiButton(void)
{
    unsigned char crc = 0;
    
    OneWireReset();
    OneWireOutByte(0x33);
    
    ResetData();
    
    detect.family = OneWireReadByte();
    crc = crc8(crc, detect.family);
    if (detect.family == 0x00 || detect.family == 0xFF)
    {
        detect.valid = false;
        return;
    }
    
    for (int i = 0; i <6; i++)
    {
//        detect.serial[i] = OneWireReadByte();
        detect.serial.push_back(OneWireReadByte());
        crc = crc8(crc, detect.serial[i]);
    }
    detect.crc = OneWireReadByte();
    if (crc == detect.crc)
    {
        detect.valid = true;
    }
    //dbg.printf("[Detect Ibutton]\r\n");
    return;
}

std::string conv(const unsigned char &val)
{
    char st[5];
    sprintf(st,"%02X",val);
    return st;
}

bool iButton::IsTaping(void)
{
    return detect.valid;
}

std::string iButton::GetData(void)
{
    size_t sz = detect.serial.size();
    string ret = "";
    
    for(int i=sz-1; i>=0; i--)
    {
        ret += conv(detect.serial[i]);
    }
    return ret;
}

unsigned char iButton::crc8(unsigned char crc, unsigned char data)
{
    crc = crc ^ data;
    for (int i = 0; i < 8; i++)
    {
        if (crc & 0x01)
        {
            crc = (crc >> 1) ^ 0x8C; 
        }
        else
        {
            crc >>= 1; 
        }
    }
    return crc;
}