AVR128DA UART to USB conversion

Log in or register to post comments
Go To Last Post
11 posts / 0 new
Author
Message
fwe
fwe's picture
Level: Rookie
Joined: Thu. Nov 12, 2020
Posts: 23 View posts
#1
Posted by fwe: Thu. Nov 12, 2020 - 07:40 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I am looking into options to convert UART to USB. Will this module work with the  AVR128DA48T-E/PT ? 

UM232H-B breakout module.

 

Thanks,

Priya

 

 

  UM232H-B Breakout Mod

 

This topic has a solution.

Tags:

AVR Microcontrollers, megaAVR and tinyAVR, solved
Last Edited: Thu. Nov 12, 2020 - 10:25 PM
Top
ka7ehk
ka7ehk's picture
Level: 10k+ Postman
Joined: Fri. Nov 22, 2002
Posts: 21802 View posts
Location: Tangent, OR, USA
Posted by ka7ehk: Thu. Nov 12, 2020 - 07:56 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

That appears to be a cheap replacement for a "USB-serial" cable. It plugs into a USB-A connector such as you find on a laptop or desktop computer. So, it is the host end.

 

I would use one of the FT232R breakouts, or similar, at the client end with a standard USB cable.

 

Jim

 

Until Black Lives Matter, we do not have "All Lives Matter"!

 

 

Top
fwe
fwe's picture
Level: Rookie
Joined: Thu. Nov 12, 2020
Posts: 23 View posts
Posted by fwe: Thu. Nov 12, 2020 - 08:15 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Jim,

Thank you for your reply.

Mouser has this board:

FT232RL-BO

 

I can connect this to a laptop with a mini USB cable. If I jumper 

uart signals from the  AVR128DA48 Curiosity Nano Evaluation Kit

will I see the USB input on my laptop? Through teraterm maybe?

 

Priya

 

 

 

Last Edited: Thu. Nov 12, 2020 - 08:18 PM
Top
awneil
awneil's picture
Level: 10k+ Postman
Joined: Fri. Jul 1, 2005
Posts: 21330 View posts
Location: Basingstoke, Hampshire, UK
Posted by awneil: Thu. Nov 12, 2020 - 08:52 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0


 

fwe wrote:
UM232H-B breakout module

You mean this:

https://www.ftdichip.com/Support...

 

fwe wrote:
FT232RL-BO

This:

https://www.gravitech.us/ftusbto...

 

 

Always helps if you give a link so that we can find exactly what you're talking about.

 

The key thing you need to look at is the voltage levels - they must match the levels that your AVR is using.

 

fwe wrote:
AVR128DA48 Curiosity Nano

You do realise that this already has a built-in USB-to-UART connection - so there's no need to add an external one ?

 

https://www.microchip.com/Develo...

 

 

EDIT

 

decent picture of UM232H-B

Top Tips:

  1. How to properly post source code - see: https://www.avrfreaks.net/comment... - also how to properly include images/pictures
  2. "Garbage" characters on a serial terminal are (almost?) invariably due to wrong baud rate - see: https://learn.sparkfun.com/tutorials/serial-communication
  3. Wrong baud rate is usually due to not running at the speed you thought; check by blinking a LED to see if you get the speed you expected
  4. Difference between a crystal, and a crystal oscillator: https://www.avrfreaks.net/comment...
  5. When your question is resolved, mark the solution: https://www.avrfreaks.net/comment...
  6. Beginner's "Getting Started" tips: https://www.avrfreaks.net/comment...
Last Edited: Thu. Nov 12, 2020 - 08:53 PM
Top
ka7ehk
ka7ehk's picture
Level: 10k+ Postman
Joined: Fri. Nov 22, 2002
Posts: 21802 View posts
Location: Tangent, OR, USA
Posted by ka7ehk: Thu. Nov 12, 2020 - 09:06 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

To answer your question, the FTD232R will be recognized as a COM port in Windows. On a Mac, it  will be a named serial  port. Don't remember how it appears in Linux but it should be like  any other serial port device.

 

As awneil points out, however, you really don't need one.

 

Jim

 

Until Black Lives Matter, we do not have "All Lives Matter"!

 

 

Top
fwe
fwe's picture
Level: Rookie
Joined: Thu. Nov 12, 2020
Posts: 23 View posts
Posted by fwe: Thu. Nov 12, 2020 - 09:09 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I am asking about the latter (Gravitech, link below). Looks like the AVR EK uses 5V.

 

FT232-RL breakout board

 

My original question was about this board:

 

UM232H-B breakout module.

https://www.ftdichip.com/Support...

 

Will the item from the first link work?

 

Thanks,

Priya

 

 

Top
obdevel
obdevel's picture
Level: Hangaround
Joined: Sun. Dec 22, 2019
Posts: 448 View posts
Location: Cambridge, UK
Posted by obdevel: Thu. Nov 12, 2020 - 09:20 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

The schematic for the Curiosity Nano is here: http://ww1.microchip.com/downloa...

 

As you can see, the onboard ATSAMD21 chip provides a debug and serial interface via USB.

 

All of the AVR128DA48's IO pins are broken out, so you could attach an external USB/serial adapter, but there is no need to.

 

Why do you think you need an external USB/serial interface module ?

Top
fwe
fwe's picture
Level: Rookie
Joined: Thu. Nov 12, 2020
Posts: 23 View posts
Posted by fwe: Thu. Nov 12, 2020 - 09:22 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Sorry about my confusion. The 

AVR128DA48 Curiosity Nano Evaluation Kit

 

has an USB port. I assumed this is to power the eval board.

I can use a 5V DC power adapter.

 

My laptop uses windows 10.

 

Is the USB port on the EK for the debugger? I need another UART to USB for data transfer

bits from the UART as processed by the firmware. This is to mimic adding an USB 

peripheral to the MCU.

 

Thanks,

Priya

 

 

 

Last Edited: Thu. Nov 12, 2020 - 09:23 PM
Top
awneil
awneil's picture
Level: 10k+ Postman
Joined: Fri. Jul 1, 2005
Posts: 21330 View posts
Location: Basingstoke, Hampshire, UK
This reply has been marked as the solution. 
Posted by awneil: Thu. Nov 12, 2020 - 09:34 PM (Reply to #8)
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

 

fwe wrote:
I assumed

better to study the User Manual - linked above

 

this is to power the eval board.

It does that - but not only that.

 

Is the USB port on the EK for the debugger?

Yes - and that includes the USB-to-UART

 

I need another UART to USB for data transfer

No - by the wonder of USB, it's all done down one cable

 

 

EDIT

 

 

Top Tips:

  1. How to properly post source code - see: https://www.avrfreaks.net/comment... - also how to properly include images/pictures
  2. "Garbage" characters on a serial terminal are (almost?) invariably due to wrong baud rate - see: https://learn.sparkfun.com/tutorials/serial-communication
  3. Wrong baud rate is usually due to not running at the speed you thought; check by blinking a LED to see if you get the speed you expected
  4. Difference between a crystal, and a crystal oscillator: https://www.avrfreaks.net/comment...
  5. When your question is resolved, mark the solution: https://www.avrfreaks.net/comment...
  6. Beginner's "Getting Started" tips: https://www.avrfreaks.net/comment...
Last Edited: Thu. Nov 12, 2020 - 09:52 PM
Top
ki0bk
ki0bk's picture
Level: Raving Lunatic
Joined: Mon. Sep 8, 2014
Posts: 8400 View posts
Location: Olathe KS
Posted by ki0bk: Thu. Nov 12, 2020 - 09:50 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

fwe wrote:

This is to mimic adding an USB peripheral to the MCU.

The AVR can not be a USB host to another USB device! 

 

 

 

(Possum Lodge oath) Quando omni flunkus, moritati.

"I thought growing old would take longer"

 

Top
fwe
fwe's picture
Level: Rookie
Joined: Thu. Nov 12, 2020
Posts: 23 View posts
Posted by fwe: Thu. Nov 12, 2020 - 10:25 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

In the application PCB, (in the future), the FTDI chip is needed to transfer data to 

an external processor (PC). Its great the eval kit does not need such an adapter.

 

Thanks!

Priya

 

 

Attachment(s): 

Image icon IMG-1254.JPG
Top