By What is UART Communication Protocol?
Hey, if you’re just starting out with embedded systems, you might get a bit confused when you see terms like UART, TXD, RXD, baud rate, and8N1.
But honestly, UART isn’t as complicated as it sounds. Just keep this in mind.
UART meaning is (Universal Asynchronous Receiver/Transmitter) is one of the most widely used serial communication protocols in embedded systems.
UART Protocol is basically a way to send data serially without needing a clock line. As long as both devices agree on the communication settings, they can send and receive data just fine. this is also called UART communication protocol.
The most common setup uses just 3 wires:
TXD: For sending data
RXD: For receiving data
GND: Common ground
Watch out for this common beginner mistake:
You need to connect TX to the other device’s RX, and RX to the other device’s TX.
Not TX to TX, and definitely not RX to RX.
A typical UART data frame has:
Start bit, data bits, parity bit, and stop bit.
Take the most common setup for example:
115200,8N1
Here’s what that means:
115200: That’s the baud rate
8:8 data bits
N: No parity, so no parity bit
1:1 stop bit
So 8N1 basically means:
8 data bits + no parity +1 stop bit.
UART communication protocol is super common in embedded development Like when you connect a microcontroller to a serial port debugging tool
Or when an MCU talks to a GPS module.
Or when an MCU connects to a Bluetooth module Or when an MCU links up with all kinds of sensor modules.
When you’re setting up a serial port, make sure to check these 4 things:
Are the data bits, parity bits, and stop bits all consistent?
You know, when you’re getting garbled data on your serial port, it’s usually not because of a coding issue, but because the parameters aren’t aligned.
Did you cross-connect TX/RX?
Is the GND properly connected?
Are the baud rates matching?
When you’re getting into embedded systems, UART protocol is one of those fundamental communication protocols you really need to get comfortable with. Once you understand this diagram, you’ll pretty much have the whole UART framework figured out.
If you found this useful, like and save it.
Learn More:
Can Bus Communication
Reading Circuit diagram
embedded #microcontroller #STM32 #UART#serialcommunication #embeddeddevelopment#hardwareengineer #electronicsengineer #internetofthings #embeddedlearning #stm32microcontroller #smarthardwaredesign #electronicinformation #softwaredesignanddevelopment