Contents
What do I need to know about UART settings?
UART Parameters UART has settings that need to be the same on both devices to have proper communication. These UART settings are the baud rate, data length, parity bit, number of stop bits, and flow control.
What does the parity bit do on UART?
Parity Bit: Optional error checking value. If the UART is configured for even or odd parity, an extra bit will be added to the frame to indicate if the contents of the data bits sum to an even or odd value. Setting this to none removes the bit from the frame.
What kind of peripheral devices use UART ports?
Complex peripheral devices such as GPS modules, LCD displays, and XBee radios typically use Universal Asynchronous Receiver Transmitter (UART) ports (often simply called serial ports) to communicate. The UART is a generic interface for exchanging raw data with a peripheral device.
How do you connect two UART devices together?
Connecting two UART devices together is simple and straightforward. Figure 1 shows a basic UART connection diagram. One wire is for transmitting data (called the TX pin) and the other is for receiving data (called the RX pin). We can only connect two UART devices together.
What is the baud rate of a UART?
Baud rate is the number of bits per second (bps) a UART device can transmit/receive. We need to set both UART devices with the same baud rate to have the proper transmission of data. Common values for baud rate are 9600, 1200, 2400, 4800 , 19200, 38400, 57600, and 115200 bps. Data length refers to the number of bits per byte of data.
How is the parity bit set in UART peripheral?
The UART peripheral calculates the number of 1s present in the transmission. If the parity is configured to even and the number of 1’s is even then the parity bit is set zero. If the number of 1s is odd, the parity bit is set to a 1 to make the count even.
How to set up UART communication on the Arduino-circuit?
The code below adds Serial.begin (9600); inside setup () to initialize the Arduino Uno UART with a baud rate of 9600 bps and other parameters set to default values.