Understanding UART

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Understanding UART

Рет қаралды 180,982

Күн бұрын

This video explains the technical overview of the UART (universal asynchronous receiver/transmitter) serial protocol, including a description of the frame structure and the significance of each frame bit.
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Пікірлер: 115

@AJRobinson 2 жыл бұрын

After watching 6 videos, this one was clear, concise, wasn't 13 minutes long, didn't have awful hand-writing, and included everything I needed to know. Thanks!

@pauldenisowski 2 жыл бұрын

Thanks!

@jigyasupant453 Жыл бұрын

Highly appreciate the efforts put in to explain everything in a concise manner. Thanks!!

@pauldenisowski Жыл бұрын

Thanks!

@abhimanyu2842 3 жыл бұрын

Small Correction S has value hex value as 0x53 and decimal value as 83.

@pauldenisowski 3 жыл бұрын

Yep, that's a typo - bit pattern and diagram are correct. Thanks!

@abdulrahmanshriefhewala1460 6 ай бұрын

@siricortana9550 7 ай бұрын

Short and comprehensive -- amazing video!

@pauldenisowski 7 ай бұрын

Thank you!

@norvalchenu6102 3 жыл бұрын

I found this video very useful. Thank you so much!!

@occamraiser 8 ай бұрын

Ahh, happy days of measuring one and a half start bits to work out the width of the clock/pulses to manually read the data from a remote UART. Life was such fun writing process control software in the 1980s :)

@aravindb9881 9 күн бұрын

Thanks, parity concept explanation is really excellent.

@Someone-fu7wz 5 ай бұрын

When someone understands a thing he knows how to explain it clearly! Thank you :D

@pauldenisowski 4 ай бұрын

Thanks!

@shvideo1 4 жыл бұрын

Excellent video so very clearly explained. This is the best I have seen on this topic. Thank you for covering all the bases.

@chetananam475 3 жыл бұрын

Extremely clear cut explanation!

@BALO_BERSERK Жыл бұрын

Excellent video. You clarified many doubts and I understood new concepts.

@selvakumarr6672 Жыл бұрын

The parity bit is more clear now. Thanks.

@limenspicewithshaheenkhali5222 4 жыл бұрын

Thnku so much for such an easy explanation

@suryakrishsaiyan 4 ай бұрын

I have a question here: How do you know if it is a stop bit or a sequence of 1's as data. For example, if i need to send 0xffff, when will UART know that the data has ended?

@elektron2kim666 Ай бұрын

It's usually automatic in "drivers" so you load in something and use a command like 'write "oxffff"' from instructions on the internet. The driver is something like 'Uart.h' or whatever. It's probably 300 lines in C or MicroPython and you need to write 5 lines very carefully to make it happen or you use some more advanced software doing most of it.

@dipsylogic1715 3 жыл бұрын

Incredible explanation

@curtpiazza1688 6 ай бұрын

Clear concise explanation! 😊

@pauldenisowski 6 ай бұрын

Thank you!

@motivationalcomred Жыл бұрын

uart(universal asynchronous reciever transmitter) - parity(error detection) - asynchronous so both sender and reciever should transmit at same speeD(baud rate) - tx,rx are registers used in transmitting and recieving data

@gyricyace9215 Жыл бұрын

yeah rohde & schwarz rulezzz ;) pretty good explanation, with few precise questions left to be solved by myself, but i will figure that out soon! keep up the good work! thanks a lot

@pauldenisowski Жыл бұрын

Thanks for the feedback!

@Annie_EE Жыл бұрын

This is a great introduction

@MusaYmc 2 жыл бұрын

Neat and tidy explanation, tnx!

@saumittrasarker7138 3 жыл бұрын

Thank you sir for a clear concept video. best wishes for you.

@sung-hyunchoi25 3 жыл бұрын

THANKS FOR GREAT EXPLANATION!

@pascalkreis1524 2 жыл бұрын

Very well done. Thank you for this great explanation.

@pauldenisowski 2 жыл бұрын

Thanks for the feedback!

@aumotion 11 ай бұрын

Nowadays UART often reaches 3 Mbps, i have even used 6 Mbps. Serious SOC have many UARTs peripherals. UART is trivial to handle on the software side. UART is ... GREAT.

@pauldenisowski 11 ай бұрын

UART will always have a special place in my heart :)

@ronan5228 5 ай бұрын

Good video, but a minor correction! 0x52 is listed as ASCII "S" but it is actually 0x53, caused me some confusion while watching :)

@pauldenisowski 4 ай бұрын

(laughs) I wish I had a dollar for every person who noticed that :) You're absolutely correct - thanks!

@SuperGoodka 3 жыл бұрын

thanks a lot! its very easy to understand

@akashbidap 2 жыл бұрын

admirably explained sir enjoyed the video 😍

@Ranmitita 3 жыл бұрын

Great video, thanks for this!

@vinoth3895 4 жыл бұрын

Thank you!

@Windy254 4 ай бұрын

Thank you.

@pauldenisowski 4 ай бұрын

Thanks for watching!

@JeremyCook 11 ай бұрын

As others have said, very good - not too long, but seems to hit the important details well!

@pauldenisowski 11 ай бұрын

Thanks (again!)

@JeremyCook 11 ай бұрын

@@pauldenisowski 😄

@abheetl9743 Жыл бұрын

Excellent. To the point.

@Autotrope 3 жыл бұрын

Great explanation

@milo7605 Жыл бұрын

very usefull and concise, thank you!!!

@pauldenisowski Жыл бұрын

Thank you!

@SmoothCode 2 жыл бұрын

Teaching like a GOD.

@BdFln_uzilya Ай бұрын

No cap

@maxint2680 3 жыл бұрын

The stop bit just looks like a normal "1" bit. How to distinguish a stop bit from a useful "1" bit, or a useful "1" bit from a stop bit? It is not explained in the video - I did not see the use of any prepositioned "length field" or "escape sequence". Can anyone help me with this?

@maxint2680 3 жыл бұрын

After doing some searching, I believe the frame length is also pre-configured just like the baud rate. (Please let me know if I am wrong)

@pauldenisowski 3 жыл бұрын

@@maxint2680 Yes, that's correct: Normally in serial communications, you have to explicitly specify (i.e. configure) certain parameters, which need to match on both ends of the connection. These are the speed (baud rate - e.g. 9600), the number of data bits (7 or 8, usually), the number of stop bits (almost always 1), and the parity type (none, even, or odd). So if you know these values, you can derive the length of the frame. If you use PuTTY as a terminal program, these values can be found under "Connection -> Serial"

@maxint2680 3 жыл бұрын

@@pauldenisowski Detailed explanation. Thanks!

@kirlasharat2714 10 ай бұрын

actually i have one doubt , inside the UART we have transmitter and receiver . will both transmitter and receiver will work at same clock frequency

@pauldenisowski 4 ай бұрын

In order to UART to work, but transmitter and receiver have to be configured to run at the same speed (asynchronous - no shared clock).

@battelground1526 3 жыл бұрын

i have not understand that parity bit.means if data bits are 4-1s then parity bit sould be low(0).

@pauldenisowski 3 жыл бұрын

Depends on the type of parity - even versus odd. In even parity, the number of ones in the user bits + parity bit must be even, so if you send 1 1 1 1 and are using even parity, the parity bit would be zero. If you were using odd parity, the total number of ones would need to be odd, and 1 1 1 1 would require a one as the parity bit.

@FabioSpelta 3 жыл бұрын

EPIC explanation thank you!

@jcbritobr 3 ай бұрын

Nice stuff.

@pauldenisowski 3 ай бұрын

Thank you!

@ozonewagle 3 ай бұрын

I have some confusions. 1. The LSB is indicated first in waveform but actually receiver is receiving the MSB first. 2. What kind of line coding techniques are used; it is told that NRZ-I is used but the waveforms just represent Unipolar NRZ. 3. How cannot the receiver misinterpret as the end of data if consecutive 1's is present in the data which is similar as stop bits?

@pauldenisowski 3 ай бұрын

1. The order of the bits (LSB or MSB) has to be agreed upon by the transmitter and receiver (and clearly must match at both ends) 2. NRZ is the most common type of line coding used 3. The transmitter and receiver must be configured to use the same baud rate, number of data bits, parity type, etc. From these two pieces of information, it is possible to derive the length of the frame (number of bits) and distinguish between a payload "1" and the stop bit.

@DarkNevrozz 3 жыл бұрын

Very well explainded thanks !

@pauldenisowski 3 жыл бұрын

Thanks for the feedback!

@isuckatthisgame 4 ай бұрын

0% bull shit 0% advertisements 50% swag 50% spot on content

@pauldenisowski 4 ай бұрын

Thanks! Really appreciate the feedback!

@rahmanmd8460 2 жыл бұрын

4:15 its ox53

@mohsenjavaher7782 20 күн бұрын

Thank you

@danielvelkov116 3 жыл бұрын

Can it be used for media(sound,image) transfer from (for e.g) a bluetooth module? What is the cost of implementing this interface in comparison with I^2C, CAN or MLBB?

@pauldenisowski 3 жыл бұрын

My understanding is that a UART is included in most Bluetooth chips for the host-controller interface, with USB being another popular choice. Generally speaking, UART is often cheaper and easier to implement than other protocols but has lower data throughput. That said, the suitability and cost of using one protocol vs. another is a function of many things, so I couldn't really comment on that part of the question without knowing a lot more about the application, other components in the system, etc.

@sudhansumtripathy 3 ай бұрын

can we have a FlexRay tutorial for the braking of M Benz

@pauldenisowski 3 ай бұрын

I'm working on some automotive protocol presentations that should be ready later this year :)

@devided4299 Жыл бұрын

Aren't there supposed to be 8 data bits, for 8 bits equal to 1 bite?

@pauldenisowski Жыл бұрын

Typically the user data is 8 bits long. That said, UART doesn't specify how long the payload should be. I still remember when 7-bit ASCII was the norm in serial text transmission.

@getinthespace7715 3 ай бұрын

Awesome.

@pauldenisowski 3 ай бұрын

Appreciate the feedback - thanks for watching!

@Thinkeaic 2 ай бұрын

Best video ever

@saumilkapadia88 3 жыл бұрын

Very nice !

@tutankamon31 Жыл бұрын

Thanks for great explanation. 0x52 should be 1010010 in binary system.

@pauldenisowski Жыл бұрын

Lol - I've had about a half dozen people catch that already :) I guess I should be happy that people are watching the video that closely. Thanks!!!

@erenoz2910 2 жыл бұрын

okay but how is something like "11111111" transmitted? how does the receiver tell the data apart from the stop bit?

@igornedashkivskyi1472 4 ай бұрын

You are always have "start" bit for this purpose which are "0" (low level one), this is kind of something change or begin at the line.

@ThanhThanh-zu3gu 3 жыл бұрын

thank you

@egorgreb3828 2 жыл бұрын

Awesome!

@sriramkrishnamurthy4473 2 жыл бұрын

i love u bro amaze

@mythix8070 2 жыл бұрын

I'm a bit late but can I have the presentation I need it for school

@VvtheD3M0N 2 жыл бұрын

so to go from & bit ASCII to LSB, you just have to reverse the order of the bit?

@abandxz 3 жыл бұрын

I'm facing problems with one of device , where the display required 7-n-1 setting but for the input need 8-n-1

@pauldenisowski 3 жыл бұрын

7N1 means seven bits, no parity bit and one stop bit, whereas 8N1 means eight bits, no parity bit and one stop bit, so these settings are most likely incompatible. If one of the endpoints is a configurable terminal program (like Hyperterm, PuTTY, etc.) you should be able to configure these parameters.

@Ankit.max. Жыл бұрын

we are not mention in code ,that type of method so where we use that type of method

@spaceman1328 3 жыл бұрын

More thn basic 🙌

@watermark9282 3 ай бұрын

i have a question imagine a data with all 1's then how does the receiver identify the stop bit

@pauldenisowski 3 ай бұрын

UART requires that both sides be configurated with the same bit rate and the number of data bits (this is fixed for all UART frames exchanged and cannot be "signaled"). So the receiver will know how long the frame is and thus can identify the stop bit.

@sanjaysethi7033 10 ай бұрын

There’s a very silly error here: ASCII for “S” = 0x53 NOT 0x52!!

@pauldenisowski 6 ай бұрын

Yep, must have fat-fingered that one (binary is correct). Thanks!

@marcinpozniak1605 Ай бұрын

4:10 'S' is 0x53 in ascii, otherwise the video was flawless just as the other one ;)

@TheMrR9 8 ай бұрын

based

@rizwanrazvi-tl1qg Жыл бұрын

hi...I want take 8bits data and 2 bits parity in design .Is it possible?

@pauldenisowski Жыл бұрын

Sorry, not with "standard" UART. Is there a reason why you would want a second parity (well, error-checking) bit?

@Toto-cm5ux Жыл бұрын

For people who doesn't understand math, S is 0x53 not 0x52

@pauldenisowski Жыл бұрын

Actually, it's for people who can't type :) The binary is correct :)

@jacktorrance2336 5 ай бұрын

0x52 != 1010011

@pauldenisowski 4 ай бұрын

Thanks - you're absolutely right :)

@JohnJohn-gy2st Жыл бұрын

Hello

@pauldenisowski 6 ай бұрын

Hi!

@Estuan 3 жыл бұрын

Pónganle subtitulos al español :c

@pauldenisowski 3 жыл бұрын

Si pudiera, lo haría :)

@feelpainacceptpain 2 жыл бұрын

Dbit

@y_x2 3 ай бұрын

UART need 3 wires not 2!!! UART are rated in bit per second NOT baud rate!!! Two stop bits is never used for at least 60 years...

@pauldenisowski 3 ай бұрын

Yes, more than one stop bit is extremely rare. But I'm not sure what you mean by UART needing 3 wires - could you clarify? Thanks!

@zxchtl 3 ай бұрын

@@pauldenisowskicould be referencing a ground wire