Basic Library

Digital I/O
Analog I/O
Advanced I/O
Time
Math
Trigonometry
Random Numbers
Bits and Bytes
Interrupts
Serial Comm.

Standard Library

Ethernet
Servo Motor
Stepping Motor
Character LCD
SPI
I2C (Wire)
SD Card
SD (File Operations)
Periodic Operation
Clock (RTC)
PPG (Pulse Generator)
WiFiEsp
ICS (Serial Servo)

FreeRTOS Tips

Overview
Task
Queue
Timer
Interrupt Management

Bits and Bytes Operations

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
Sets (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()
{
}