combining four 2 bit messages to make a byte message

Projects Programming
5

You could also store the small variables and the combined value in the same place.

I would prefer the shift and or and it is more prortable but just as an example:

struct bits {
  byte var4 : 2;
  byte var3 : 2;
  byte var2 : 2;
  byte var1 : 2;
};
union both {
  bits bi;
  byte val;
} test;

void setup() {
  Serial.begin(250000);
  test.bi.var1 = 0b00;
  test.bi.var2 = 0b10;
  test.bi.var3 = 0b01;
  test.bi.var4 = 0b11;
  Serial.print(F("result = 0b"));
  Serial.print(test.val, BIN);
  Serial.print(F(", 0x"));
  Serial.println(test.val, HEX);
}
void loop() {}

result = 0b100111, 0x27