Comments on: Using the USART of AVR Microcontrollers.

By: Sa'eed Uthman Ahmad

Sa'eed Uthman Ahmad — Thu, 05 Jan 2012 12:21:50 +0000

Good Afternoon sir, thanks for your assistance that you have been rendering to many people, please sir i want a concise and comprehensive tutorial on PIC MICROCONTROLLERS because i am facing my final year project which is based on this type of MCU also i am appreciating the kind of simplicity of language you are using on this AVR MCu tutorial, Pls sir I need also the basics of LCD tutorial which is this part of your tutorials hoping my problems will be solved. Thanks Sir Avinash

By: jesus

jesus — Sun, 04 Dec 2011 05:05:59 +0000

Man I’m from mexico and my english is not the best but my congratuelations to you, this really helped me with my projects

By: Mike

Mike — Fri, 04 Nov 2011 13:59:05 +0000

Hello.How can I get/make a serial bootloader for an ATMEG16-16PU running at 16MHz? If the microcontroller has a bootloader (for 13.5Mhz) cold it be erase? Sorry if the subject is off topic.
Thanks

By: Armen

Armen — Fri, 08 Jul 2011 11:56:30 +0000

Seems that UBRR is no longer directly handled via AVR Studio 5, immediate 16bit (2xregister) writing on UBRR doesn’t work, you should specify UBRRH,UBBRL independently.

By: Avinash

Avinash — Wed, 08 Jun 2011 02:33:18 +0000

@Mahadi,

See this

http://extremeelectronics.co.in/avr-tutorials/programming-in-c-tips-for-embedded-development/

Also remembering one fact will help you

“We are writing programs in C”

So you must know C language (this is NOT a magical advice!)

If you knew C you already understood the above line !!!

By: Mahdi

Mahdi — Tue, 07 Jun 2011 14:42:11 +0000

Hi dear Avinash
Where can I find some tutorial to better understand of bitwise operations you use in functions? For example, what does this mean? !(UCSRA & (1<

By: PradeepKumar P

PradeepKumar P — Wed, 25 May 2011 12:19:15 +0000

Hi
It is very usefull to us….

By: Marylou Lapar

Marylou Lapar — Sat, 21 May 2011 21:28:38 +0000

I love your blog, great article, many thanks!

By: Avinash

Avinash — Mon, 28 Mar 2011 04:57:53 +0000

@Sam Joshua,

Please ask Uniboard dealer or your college for any help. Because they are the one who are getting paid from your Pocket.
We are not here to do the real magic for free.

Yes I may sound rude. But I cannot do a free tech support for Other Companies Board.

So please keep away such topics from here.

By: sam joshua

sam joshua — Mon, 28 Mar 2011 04:49:28 +0000

sir
i have gone through your tutorials all were very nice and helpful. as i am new to this uart i have a atmega 128 kit (uniboard) given from my college. i need to transmit a data from hyper terminal to the microcontroller and need to display the value in the lcd provided in it. can you give me some guidance in it.
thanking you
dam

By: Achal Agrawal

Achal Agrawal — Sun, 27 Mar 2011 07:52:36 +0000

Brilliant series of microcontroller tutorials…!!! Hats off…!!
You must seriously write a book..

Btw, I wanted to ask if i can use a normal bluetooth dongle instead of a dedicated bluetooth module. My bluetooth dongle has an ISSC chipset that supports HCI UART. So can I use HCI on ATMega16..?

By: vish

vish — Mon, 28 Feb 2011 12:48:33 +0000

very useful conccept….

By: broheim

broheim — Sun, 20 Feb 2011 11:09:17 +0000

Nice tut

By: A M Morawala

A M Morawala — Sat, 12 Feb 2011 05:37:14 +0000

Hi Alex. Glad to help:)

By: Alex

Alex — Fri, 11 Feb 2011 10:25:59 +0000

@ A M Morawala

Thanks man! Your comment made me turn my attention to the development board, and I realised the connection was somehow overrided by a pin setting for the RS232 chip (the board has both USB UART and RS232 ), so I turned that OFF and now my communication works both ways!

By: A M Morawala

A M Morawala — Fri, 11 Feb 2011 06:39:24 +0000

Hi Alex,
SOmetimes, we geeks look at simple problems in a complex manner. If you say that the terminal allows data reception, it means the terminal is OK. Have you checked the transmit wire? Is it showing continuity from end to end?
You know there are 3 wires,Rx, Tx & ground. All 3 have to be connected.

By: Alex

Alex — Thu, 10 Feb 2011 08:57:50 +0000

Well, I’ve used several terminals: Realterm, one provided by the manufacturer of the board (Mikroelectronika) and a third one made by myself. And all with the same result.

The board I’m using comes equiped with a FT232RL chip, for which I didn’t install any special driver, I just let Windows 7 do the job. It all seemd OK, and Windows asigned it COM9.

Could it be a driver based problem? Or maybe a hardware one?

By: Avinash

Avinash — Thu, 10 Feb 2011 02:41:42 +0000

@Alex

>> On PC you are using which terminal program?
>> What type of USB to Serial Convertor you are using?

By: Alex

Alex — Wed, 09 Feb 2011 16:49:12 +0000

Hey!

First of all, great tutorial! I am new to AVR and UART communications and your tutorial helped a lot.
I used your code and it seems to work OK, with one problem. I am able to send data to the PC, but not from the PC to the controller… The program seems to get stuck in the waiting loop :
while(!(UCSRA&(1<

I think this means that it is waiting for a character to arrive, but I keep on feeding it characters from the PC terminal, but nothing changes. So it seems I have a one way communication only.

What do you think the source of this problem might be? Thank you in advance!

Alex

By: Avinash

Avinash — Wed, 09 Feb 2011 03:04:23 +0000

@Morawala
See
http://extremeelectronics.co.in/avr-tutorials/rf-communication-between-microcontrollers-%E2%80%93-part-iii/