Re: [Amforth] Serial interface at 115200 BAUD on Arduino Mega 2560

[Fred Zelders]

Tristan,

I found an article about step-down en step-up levelers @ 
https://hackaday.com/2016/12/05/taking-it-to-another-level-making-3-3v-and-5v-logic-communicate-with-level-shifters/
 



Fred

> Op 15 mrt. 2019, om 01:30 heeft Tristan Williams  het 
> volgende geschreven:
> 
> Fred,
> 
> Many thanks. I have a DSO112A so I was interested in what you are
> looking to do.
> 
>> One of the connectors is a alternative UART. It is a LVTTL connection.
>> I want to connect the Arduino uart1 (TXD1/RXD1) to this connector (J11).
> 
> I think LVTTL is ~3.3V levels rather than the 5V levels of the
> Mega2560. Some level shifting will be needed/prudent.
> 
>> The bit stream format for the serial interface is: 115200 baudrate,
>> 8 data bits, 1 stop bit, and no parity. This is fixed and can not be
>> changed 
> 
> Are you programming the Mega2560 with AmForth?
> 
> 115200 is uncharted territory for me and usart1. I have written some
> AmForth words which work for me at 9600
> 
> https://www.mostlymostly.uk/post/2019.02.01/
> 
> I have just quickly reconfigured them locally for 115200. Simple
> typing at a terminal seemed OK. Beyond that, how much data is sent by
> the DSO112A, how often, and what you want to do with it will matter,
> so it is difficult to know whether it would work well enough or not.
> 
> Tristan
> 
> 
> 
> ___
> Amforth-devel mailing list for http://amforth.sf.net/
> Amforth-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/amforth-devel


___
Amforth-devel mailing list for http://amforth.sf.net/
Amforth-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/amforth-devel

Re: [Amforth] Serial interface at 115200 BAUD on Arduino Mega 2560

[Fred Zelders]

Thanks Tristan!

I'll let you know if I managed to read/write to the DSO112A with AmForth


Fred

> Op 15 mrt. 2019, om 13:37 heeft Tristan Williams  het 
> volgende geschreven:
> 
> Fred
> 
>> I don't have (and can't find) the data sheet that is referred to.
>> Do you have that datasheet? Can I have a copy? (PDF?) 
> 
> https://www.microchip.com/wwwproducts/en/ATmega2560
> 
> I made two changes 
> 
>#16 UBRR1 ! \ change to this - change 1
> 
>  %10 UCSR1A bm-set \ add line above - change 2 
>%10011011 UCSR1B c! \ these two
>%1110 UCSR1C c! \ lines
> 
> Tristan
> 
> 
> ___
> Amforth-devel mailing list for http://amforth.sf.net/
> Amforth-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/amforth-devel



___
Amforth-devel mailing list for http://amforth.sf.net/
Amforth-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/amforth-devel

Re: [Amforth] Serial interface at 115200 BAUD on Arduino Mega 2560

[Tristan Williams]

Fred

> I don't have (and can't find) the data sheet that is referred to.
> Do you have that datasheet? Can I have a copy? (PDF?) 

https://www.microchip.com/wwwproducts/en/ATmega2560

I made two changes 

#16 UBRR1 ! \ change to this - change 1

  %10 UCSR1A bm-set \ add line above - change 2 
%10011011 UCSR1B c! \ these two
%1110 UCSR1C c! \ lines

Tristan


___
Amforth-devel mailing list for http://amforth.sf.net/
Amforth-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/amforth-devel

Re: [Amforth] Serial interface at 115200 BAUD on Arduino Mega 2560

[f.zelders--- via Amforth-devel]

Tristan,

I like the DSO112A very much. The fact that this device can be controlled by a 
processor/computer makes it even more useful.

I managed to 'communicate' in Python on my MacBookAIr with the DSO112A via USB 
(using the CP2102 driver that can be downloaded from www.silabs.com 
).

> Are you programming the Mega2560 with AmForth?


Yes I do. And I love it!

My challenge is to establish that withAm Forth. 
If successful I want to try to setup the DSO, trigger measurements and download 
the results.

> Some level shifting will be needed/prudent.


I can use a CP2102 USB 2.0 to TTL UART module for level shifting 
N.B. Ali Express is my friend :-)

> I have written some

> AmForth words which work for me at 9600

> https://www.mostlymostly.uk/post/2019.02.01/


Yes, I have that source too. :-)
In that source is stated: 
   \ see section 22 of atmega2560 datasheet for overview
   \ and table 22.9 in section 22.11 for specific UBBR
   \ values.  

#103 UBRR1 ! \ 16MHz 9600 UBBR1 103 
I don't have (and can't find) the data sheet that is referred to.
Do you have that datasheet? Can I have a copy? (PDF?) 

> I have just quickly reconfigured them locally for 115200. Simple

> typing at a terminal seemed OK. 


So you managed to initialize uart1 at 115200 BAUD. That is great!

Would you be so kind to provide me with the settings for the serial 
communication @ 115200



Fred


> Op 15 mrt. 2019, om 01:30 heeft Tristan Williams  het 
> volgende geschreven:
> 
> Fred,
> 
> Many thanks. I have a DSO112A so I was interested in what you are
> looking to do.
> 
>> One of the connectors is a alternative UART. It is a LVTTL connection.
>> I want to connect the Arduino uart1 (TXD1/RXD1) to this connector (J11).
> 
> I think LVTTL is ~3.3V levels rather than the 5V levels of the
> Mega2560. Some level shifting will be needed/prudent.
> 
>> The bit stream format for the serial interface is: 115200 baudrate,
>> 8 data bits, 1 stop bit, and no parity. This is fixed and can not be
>> changed 
> 
> Are you programming the Mega2560 with AmForth?
> 
> 115200 is uncharted territory for me and usart1. I have written some
> AmForth words which work for me at 9600
> 
> https://www.mostlymostly.uk/post/2019.02.01/
> 
> I have just quickly reconfigured them locally for 115200. Simple
> typing at a terminal seemed OK. Beyond that, how much data is sent by
> the DSO112A, how often, and what you want to do with it will matter,
> so it is difficult to know whether it would work well enough or not.
> 
> Tristan
> 
> 
> 
> ___
> Amforth-devel mailing list for http://amforth.sf.net/
> Amforth-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/amforth-devel


___
Amforth-devel mailing list for http://amforth.sf.net/
Amforth-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/amforth-devel

Re: [Amforth] Serial interface at 115200 BAUD on Arduino Mega 2560

[Tristan Williams]

Fred,

Many thanks. I have a DSO112A so I was interested in what you are
looking to do.

> One of the connectors is a alternative UART. It is a LVTTL connection.
> I want to connect the Arduino uart1 (TXD1/RXD1) to this connector (J11).

I think LVTTL is ~3.3V levels rather than the 5V levels of the
Mega2560. Some level shifting will be needed/prudent.

> The bit stream format for the serial interface is: 115200 baudrate,
> 8 data bits, 1 stop bit, and no parity. This is fixed and can not be
> changed 

Are you programming the Mega2560 with AmForth?

115200 is uncharted territory for me and usart1. I have written some
AmForth words which work for me at 9600

https://www.mostlymostly.uk/post/2019.02.01/

I have just quickly reconfigured them locally for 115200. Simple
typing at a terminal seemed OK. Beyond that, how much data is sent by
the DSO112A, how often, and what you want to do with it will matter,
so it is difficult to know whether it would work well enough or not.

Tristan



___
Amforth-devel mailing list for http://amforth.sf.net/
Amforth-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/amforth-devel

Re: [Amforth] Serial interface at 115200 BAUD on Arduino Mega 2560

[f.zelders--- via Amforth-devel]

Tristan,

The DSO112A can be used in two ways:
a) as a stand alone mini scope and
b) as a module that can be integrated to user’s systems. Therefore on the 
DSO112A system board several connectors are provided.
One of the connectors is a alternative UART. It is a LVTTL connection.




I want to connect the Arduino uart1 (TXD1/RXD1) to this connector (J11).

From the manual: 
The bit stream format for the serial interface is: 115200 baudrate, 8 
data bits, 1 stop bit, and no parity. This is fixed and can not be changed


Fred


> Op 14 mrt. 2019, om 19:33 heeft Tristan Williams  > het volgende geschreven:
> 
> Hi Fred,
> 
> How are you proposing to connect the DSO112A to the Arduino Mega2560 ?
> 
> Best wishes,
> Tristan
> 
> 
> On 14Mar19 12:43, f.zelders--- via Amforth-devel wrote:
>> 
>> Hello! 
>> 
>> I want to connect a DSO112A mini oscilloscope to UART1 of my  Arduino Mega 
>> 2560 .
>> The DSO112A uart only supports 115200 BAUD. So not at other baud rates.
>> How to I initialize uart1 (UBBR1, UCSR1B and UCSR1C) in order to communicate 
>> via uart1 at 115200 BAUD?
>> 
>> Hope someone can help.
>> 
>> Much appreciated!
>> 
>> 
>> Fred Zelders
>> the Netherlands
>> ___
>> Amforth-devel mailing list for http://amforth.sf.net/ 
>> 
>> Amforth-devel@lists.sourceforge.net 
>> 
>> https://lists.sourceforge.net/lists/listinfo/amforth-devel
>> 
> 
> 
> ___
> Amforth-devel mailing list for http://amforth.sf.net/ 
> Amforth-devel@lists.sourceforge.net 
> 
> https://lists.sourceforge.net/lists/listinfo/amforth-devel


___
Amforth-devel mailing list for http://amforth.sf.net/
Amforth-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/amforth-devel

Re: [Amforth] Serial interface at 115200 BAUD on Arduino Mega 2560

[Tristan Williams]

Hi Fred,

How are you proposing to connect the DSO112A to the Arduino Mega2560 ?

Best wishes,
Tristan


On 14Mar19 12:43, f.zelders--- via Amforth-devel wrote:
> 
> Hello! 
> 
> I want to connect a DSO112A mini oscilloscope to UART1 of my  Arduino Mega 
> 2560 .
> The DSO112A uart only supports 115200 BAUD. So not at other baud rates.
> How to I initialize uart1 (UBBR1, UCSR1B and UCSR1C) in order to communicate 
> via uart1 at 115200 BAUD?
> 
> Hope someone can help.
> 
> Much appreciated!
> 
> 
> Fred Zelders
> the Netherlands
> ___
> Amforth-devel mailing list for http://amforth.sf.net/
> Amforth-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/amforth-devel
> 


___
Amforth-devel mailing list for http://amforth.sf.net/
Amforth-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/amforth-devel

[Amforth] Serial interface at 115200 BAUD on Arduino Mega 2560

[f.zelders--- via Amforth-devel]

Hello! 

I want to connect a DSO112A mini oscilloscope to UART1 of my  Arduino Mega 2560 
.
The DSO112A uart only supports 115200 BAUD. So not at other baud rates.
How to I initialize uart1 (UBBR1, UCSR1B and UCSR1C) in order to communicate 
via uart1 at 115200 BAUD?

Hope someone can help.

Much appreciated!


Fred Zelders
the Netherlands
___
Amforth-devel mailing list for http://amforth.sf.net/
Amforth-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/amforth-devel