processing: convert int to byte

I'm trying to convert an int into a byte in Processing 1.0.9.

This is the snippet of code that I have been working with:

byte xByte = byte(mouseX);
byte yByte = byte(mouseY);  
byte setFirst = byte(128);
byte resetFirst = byte(127);

xByte = xByte | setFirst;
yByte = yByte >> 1;
port.write(xByte);
port.wr开发者_运维知识库ite(yByte);

According to the Processing API, this should work, but I keep getting an error at xByte = xByte | setFirst; that says:

cannot convert from int to byte

I have tried converting 128 and 127 to they respective hex values (0x80 and 0x7F), but that didn't work either. I have tried everything mentioned in the API as well as some other blogs, but I feel like I'm missing something very trivial.

I would appreciate any help.

Thank you.

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I've never used Processing before, but it's possible the | operator returns an integer regardless of the arguments' types. Try changing the problematic line to

xByte = byte(xByte | setFirst);