UART: Difference between revisions
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UART or Universal asynchronous receiver/transmitter is often used as a low level protocol to comicate with devices, such as HDD controllers, It is asynchronous meaning it does not have a clock(clk) line </br> | UART or Universal asynchronous receiver/transmitter is often used as a low level protocol to comicate with devices, such as HDD controllers, It is asynchronous meaning it does not have a clock(clk) line </br> | ||
there for relies on an external clock. | there for relies on an external clock.(this will be covered later in the Baud Rate section) | ||
</br> | </br> The UART protocol runs off two data lines plus ground(three in total), these are </br> | ||
<B> 2.0 connections</B> | |||
<ul> | <ul> | ||
<li>Transmit(TX)</li> | <li>Transmit(TX)</li> | ||
| Line 138: | Line 139: | ||
<li>Ground(GND)</li> | <li>Ground(GND)</li> | ||
</ul> | </ul> | ||
</br> | |||
The lines are typically connected to its opposite(e.g. TX to RX, RX to TX, GND to GND) | |||
<include diagram somewhere> | |||
</br> | |||
<B>3.0 Protocol configation </B> | |||
</br> | |||
There are five main aspects to communicating over UART, with two additional (Break condition, idle state) conditions. | |||
</br> | |||
<B>1.</B> Baud Rate | |||
</br> | |||
Due to UART being Asynchronous and lacking a clock(clk) signal, A baud rate must be set in order to set the speed in which data is transmitted otherwise the data will not be transmitted correctly | |||
<br>Both sides of the commication must be operating at the same speed otherwise commination will not be successful. | |||
</p> | </p> | ||
<h1 id="section0">What tools you will need</h1> | <h1 id="section0">What tools you will need</h1> | ||
Revision as of 07:12, 27 January 2025
Contents
Background information
This page will cover Universal asynchronous receiver/transmitter (UART) protocol, how it functions, how to communicate with a device over it, and where to find ports that allow access.
UART or Universal asynchronous receiver/transmitter is often used as a low level protocol to comicate with devices, such as HDD controllers, It is asynchronous meaning it does not have a clock(clk) line
there for relies on an external clock.(this will be covered later in the Baud Rate section)
The UART protocol runs off two data lines plus ground(three in total), these are
2.0 connections
- Transmit(TX)
- Receive(RX)
- Ground(GND)
The lines are typically connected to its opposite(e.g. TX to RX, RX to TX, GND to GND)
3.0 Protocol configation
There are five main aspects to communicating over UART, with two additional (Break condition, idle state) conditions.
1. Baud Rate
Due to UART being Asynchronous and lacking a clock(clk) signal, A baud rate must be set in order to set the speed in which data is transmitted otherwise the data will not be transmitted correctly
Both sides of the commication must be operating at the same speed otherwise commination will not be successful.
What tools you will need
Items are not listed in any particular orderRequired
- Test
Optional but useful
- Test
Uses of this skill
- 1.test
- 2.test
- 3.test
- Reference 1: UART basic's guide
- Reference 2: UART specification
Step-by-step guide with images
Insert step-by-step walkthrough with images and summary text here
Flow chart of order of operations
Insert a flow chart of steps and actions for each task (create using diagram)
Troubleshooting/tips and tricks
Fixes to any common issues that were encountered or could be easily encountered
Related Topics
Topics such as desoldering to chip off or firmware dumping for disk PCB repairs
Further reading
External references in wiki references can just be cited through the keyword link