SoftwareSerial with ATTiny84 using ATtiny library

[Erni]

(Except for 0.6 MHz.  I'm surprised that works.  As the clock speed is reduced below 1 MHz, the protocol becomes less reliable.  At 0.5 MHz it should fail.)

Now I have done some more testing at 600 kHz and it is indeed unreliable.

I had a sketch running for more than 40 minutes whitout any errors,
other tests only 4-5 lines before I got a KnockBang error, and most tests between those.

[Coding Badly]

Now I have done some more testing at 600 kHz and it is indeed unreliable.

Do you have a need for Knock-Bang to work at clock speeds below 1 MHz?

I had a sketch running for more than 40 minutes whitout any errors,

Excellent!

[Erni]

Do you have a need for Knock-Bang to work at clock speeds below 1 MHz?

No, I was just curious to see if it worked.

[hilukasz]

this seems like a really awesome project and exactly what I am looking for. however the sketch doesn't seem to want to compile. I get this error:

Code: [Select]

In file included from KnockBangReceiver.cpp:36:
TinyISP_SelectBuildOptions.h:175:2: error: #error

I'm on an Uno and IDE v1.0.1. I think it might have to do with TinyISP_BuildOptions.h, that doesn't seem to be in the files included.i did find TinyISP_SelectBuildOptions.h and that seemed right, however settings in there already matched what you said to change.

any suggestions?

[Coding Badly]

Sorry about that.  Try it now.

[fungus]

Not sure how this is supposed to work without power...

It won't.

That's what they taught me in EE

It might ... if one of the I/O pins is connected to a voltage source.

OTOH this is a good way to destroy chips, don't try it at home.

[hilukasz]

Sorry about that.  Try it now.

ahh, there we go! perfect. thank you.

[hilukasz]

Install the Tiny Debug Knock-Bang library...

• Download the latest version of Tiny Debug Knock-Bang...
https://github.com/Coding-Badly/TinyDebugKnockBang/zipball/master
https://github.com/Coding-Badly/TinyDebugKnockBang

• Extract the contents to a directory named TinyDebugKnockBang in your Arduino sketchbook library folder

• Start the Arduino IDE

• Ensure one of the tiny processor "boards" is selected

• Copy-and-paste this small test into the edit window...

Code: [Select]

#include <TinyDebugKnockBang.h>

void setup( void )
{
  Debug.begin( 250000 );
}

void loop( void )
{
  Debug.println( F( "Caitlin! " ) );
  delay( 1000 );
}

• Verify that the sketch compiles

I seem to be missing something. Maybe I don't fully understand what knock-bang is. Was assuming this was a simple "hello world" type message that you can test this one, could be wrong.

I have selected attiny85 at 8mhz as board and it upload fine and I can even add "!" into debugger and I get "--- Monitor starting ---" but it seems nothing is coming out. Also have 19200 baud set, no line ending. I uploaded the sketch you showed earlier:

Code: [Select]

#include <TinyDebugKnockBang.h>

void setup( void )
{
  Debug.begin( 250000 );
}

void loop( void )
{
  Debug.println( F( "Caitlin! " ) );
  delay( 1000 );
}

But I am not getting anything in the monitor aside from initiated message. On arduino its connected to Tx (though it seems like it would be Rx but all other monitors I have set up use Rx for some reason) and PB3 on the attiny (with 220ohm resistor between). Might be missing something though?

[Coding Badly]

I seem to be missing something.

You are.  Documentation.  Work keeps getting in the way.


Try this...

• With the TinyISP sketch loaded in the Arduino IDE, switch to the[font=Courier New] _TinyISP_BuildOptions.h [/font]tab ^# (sadly, it ended up the last tab)

• Add this line below the[font=Courier New] Put build options here [/font]comment...

[font=Courier New]#define RELAY_KNOCK_BANG_ENABLED  1[/font]

• Upload the modified sketch (don't forget to remove the auto-reset disable capacitor)


^# Or, with the Arduino IDE not running use an external editor to modify the file.

[hilukasz]

I seem to be missing something.

You are.  Documentation.  Work keeps getting in the way.


Try this...

• With the TinyISP sketch loaded in the Arduino IDE, switch to the[font=Courier New] _TinyISP_BuildOptions.h [/font]tab ^# (sadly, it ended up the last tab)

• Add this line below the[font=Courier New] Put build options here [/font]comment...

[font=Courier New]#define RELAY_KNOCK_BANG_ENABLED  1[/font]

• Upload the modified sketch (don't forget to remove the auto-reset disable capacitor)


^# Or, with the Arduino IDE not running use an external editor to modify the file.

• Upload the modified sketch (don't forget to remove the auto-reset disable capacitor)

Is that the on between reset and ground? I did that and no change, still get the error:

Code: [Select]


--- Knock-Bang fault: 11 ---

--- Knock-Bang fault: 11 ---


[Coding Badly]

Is that the on between reset and ground?

Yes.

I did that and no change, still get the error:

Code: [Select]


--- Knock-Bang fault: 11 ---
--- Knock-Bang fault: 11 ---


No change?  Earlier you reported that nothing was being output to the Serial Monitor.  Were error messages being output?

[hilukasz]

definitely a change, it now says --- Knock-Bang fault: 11 --- instead of nothing. Of course I should clarify, it did indicate the monitor was starting and stopping.


Edit: trimmed the unnecessary quote.

[Coding Badly]

The receive errors are listed here...
https://github.com/Coding-Badly/TinyISP/blob/master/KnockBangReceiver.cpp#L285

The one of interest is...
[font=Courier New]fault_timeout_knock          = 0x11[/font]

The receiver (your Uno) is expecting a low pulse of a certain duration (a "knock").  The pulse is too short to be a knock.

The problem could be caused by the target running at 1 MHz with code built for a processor running at 8 MHz.  Which "board" do you have selected?  Have you used "burn bootloader" to change the fuses?

[Erni]

The problem could be caused by the target running at 1 MHz with code built for a processor running at 8 MHz.

If it is of any help, I just tried a Attiny85 running at 1MHZ and selected board Attiny85 @ 8MHZ and got:

--- Knock-Bang fault: 11 ---

With the same target and selcting board Attiny85 @ 1MHZ it works as expected (Output to the serial monitor looks as it should)

[hilukasz]

The problem could be caused by the target running at 1 MHz with code built for a processor running at 8 MHz.

If it is of any help, I just tried a Attiny85 running at 1MHZ and selected board Attiny85 @ 8MHZ and got:

--- Knock-Bang fault: 11 ---

With the same target and selcting board Attiny85 @ 1MHZ it works as expected (Output to the serial monitor looks as it should)

yeah, I just did this too. It makes sense since the frequency is 8 times faster, would make the signal shorter. I was under impression serial monitor needed to be 8Mhz like normal, but this seems to run differently.

It works perfect now! thanks guys.