Thread: Need help to understand what this function is doing

Hello!
I'm new here and new at C. I am working off some example code and modifying it to suit my application.
I don't understand the example code even though I think it is basic.
I'll start with a function referenced.
I do not understand what |= means (line 5 of function)

Code:

void WriteByte (uchar DATA)
{
   uchar RG = 0;
   unit temp = 0xB800;
   temp|=DATA;
     if (RG = 0)
    {
    goto loop;
     }
     else
    {
     RG = 0;
      }
}

void main()
uint ChkSum;
while (1)
{
       ChkSum = 0;
       WriteByte (0x30);
       ChkSum+=0x30;
       WriteByte (0x31);
       ChkSum+=0x31;

       WriteByte (0x32);
       ChkSum+=0x32;
       WriteByte (0x33);
       ChkSum+=0x33;        // what does += mean?

       ChkSum&=0xFF;        // what does &= mean?
       WriteByte(ChkSum);
}

Any help is appreciated.
N_N

Thank you!
What about the rest? What does += mean and &=?
And what is the code doing?
Thanks!
N_N

Thanks-
Well no, it is not from some random site exactly
I am configuring a RFM12 transceiver to work with a PIC.
http://www.hoperf.com/upfile/RF12_code.pdf

There is some FSK protocol that I have no freakin idea about and how to transmit data wirelessly. That is what the code is doing- transmitting wireless data by accessing internal registers on the RFM12 chip.

So what I have copied and pasted is a little bit edited (I took out all the stuff that has nothing to do with transmitting). Also- it is from a different site than the pdf I posted, I found some sample code with comments.

It is hard for me to dissect sample code because I haven't done much C coding in the past few years.
N_N