Arduino Byte Juggling

[rgsparber]

A very small population will have any interest in this topic. But if you are struggling with reads and writes of all data types to EEPROM, read on…

http://rick.sparber.org/ABJ.pdf

Your comments are welcome. All of us are smarter than any one of us.

Thanks,
Rick

[Workshopshed]

Hi Rick, I had to do this kind of thing just the other day to send an integer over I2C.

To multiply by 2 you can shift the number one to the left so to multiply by 256 which is 2^8 you can do.

int b = a << 8;

A technique I used back when I was coding for my ZxSpectrum in the 1980s as it did not actually have a multiply operator.

[DIYer]

Thanks Rick! We've added your Arduino Bit Shifting Method to our Miscellaneous category, as well as to your builder page: Rick's Homemade Tools. Your receipt:

Arduino Bit Shifting Method by Rick Sparber

tags: Arduino

[rgsparber]

Yes, <<8 should do a multiply by 256. Be carful on shifting right:

long x = 0xFFEEDDCC;

x= (x>>8) & 0xFF;

Should produce 0x000000DD. Without the mask it would be 0xFFFFEEDD. It all depends on what you want.