Bits and Bytes

This library is used for bits and bytes operations.

lowByte

Description
Extracts the low-order (rightmost) byte of a variable (e.g. a word). For example, it extracts 0x34 when given a parameter of 0x1234.
Syntax
lowByte(x)
Parameters
x: A value of any type
Returns
1 byte (unsigned char)

highByte

Description
Extracts the high-order (leftmost) byte of a word. For example, extracts 0x12 when given a parameter of 0x1234.
Syntax
highByte(x)
Parameters
x: A value of any type
Returns
1 byte (unsigned char)

bitRead

Description
Reads the specified bit.
Syntax
bitRead(x, n)
Parameters
x: A value of any type
n: The position of the bit to be read
Returns
The value of the bit (0 or 1)

bitWrite

Description
Writes the specified bit.
Syntax
bitWrite(x, n, b)
Parameters
x: A value of any type
n: The location of the bit to write
b: The value to write to the bit (0 or 1)
Returns
None

bitSet

Description
Sets (writes 1 to) the specified bit.
Syntax
bitSet(x, n)
Parameters
x: A value of any type
n: The location of the bit to be set to 1
Returns
None

bitClear

Description
Clears (writes 0 to) the specified bit.
Syntax
bitClear(x, n)
Parameters
x: A value of any type
n: The location of the bit to be set to 0
Returns
None

bit

Description
Computes the value of the specified bit (bit 0 is 1, bit 1 is 2, bit 2 is 4, etc.).
Syntax
bit(n)
Parameters
n: The location of the bit that will be calculated
Returns
The value of the bit

Sample Program

Sample for lowByte and highByte.


#include <Arduino.h>
void setup()
{
    uint16_t data = 0x1234;
    Serial.begin(9600);
    while(!Serial.available()); // wait to key press.
    Serial.println(data, HEX);
    Serial.println(lowByte(data), HEX);
    Serial.println(highByte(data), HEX);
}
  
void loop()
{
}