Hi all!
I'm making a programmable load. One of the steps is to make ATmega328 to talk to a MCP4921 DAC via serial interface.
The code that does the actual sending looks like this (courtesy of tronixstuff):
outputValue = tAmps;
digitalWrite(10, LOW);
data = highByte(outputValue);
data = 0b00001111 & data;
data = 0b00110000 | data; //or data = 0b10110000 | data; to address the DACb
SPI.transfer(data);
data = lowByte(outputValue);
SPI.transfer(data);
digitalWrite(10, HIGH);
delay(10);
I do understand how this code does what it does, except for the "0b" part in the "data = 0b00001111 & data;" line in a line just below it.
If you know please explain
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