ESP8266 Community Forum

Posted: **Fri Jan 15, 2016 5:47 pm**

Hey,

I tried to add a call to attach the ticker:

Code: Select alltickDMX.attach(1, sendDMX);

in my setup that calls a function:

void sendDMX(){
  artnetnode.sendDMX();
}

But adding this attach call causes my esp to reset with this output:

Code: Select all

Panic /Users/solexious/Library/Arduino15/packages/esp8266/hardware/esp8266/2.0.0/cores/esp8266/core_esp8266_main.cpp:85 __yield

ctx: sys 
sp: 3ffffd20 end: 3fffffb0 offset: 01b0

>>>stack>>>
3ffffed0:  3ffef984 40100ffb 3fff1be0 40203226  
3ffffee0:  40100f35 00000000 402012d0 40202c94  
3ffffef0:  402012e6 00000000 3fff0a78 4020306e  
3fffff00:  3fff0a78 00000184 3ffeee7a 40203778  
3fffff10:  3ffea684 3ffea6a0 00000000 0000033e  
3fffff20:  00000350 3ffee998 3fff0a78 4020290d  
3fffff30:  3ffee998 3ffee998 00000000 40202956  
3fffff40:  0000033a 0018f558 3ffea608 40208838  
3fffff50:  40100d6c 00000000 00000000 60000600  
3fffff60:  005044f3 3ffe8890 3fff1b70 4020180c  
3fffff70:  3fff1b70 4020c03c 3ffe8c2c 4020c049  
3fffff80:  4020c08e 3fffdab0 00000000 3fffdcb0  
3fffff90:  3ffe88a0 3fffdc20 3ffefa24 40202bcb  
3fffffa0:  40000f49 40000f49 3fffdab0 40000f49

If I comment out the call it doesn't crash.

If I try calling sendDMX() just in the loop I don't get the crash...

Any ideas?

Sol

Posted: **Wed Jan 20, 2016 3:55 pm**

I'm not sure of specifics, but I also was having a very similar (if not the exact) issue. I believe that there is a timing issue of some sort, and basically from what I gather you don't want any long running task to be performed within the method that the Ticker calls. So for me, I ended up just setting a bool flag to true in the ticker method that gets called, then in the Loop it checks that flag to trigger the action.

Posted: **Sat Jan 30, 2016 2:47 am**

This is from the ADAFRUIT git rep. Hope it helps

Ticker

Library for calling functions repeatedly with a certain period. Two examples included.

It is currently not recommended to do blocking IO operations (network, serial, file) from Ticker callback functions. Instead, set a flag inside the ticker callback and check for that flag inside the loop function.

Posted: **Sat Jan 30, 2016 6:31 pm**

I came across this too and did exactly what the other poster suggested. I have a ticker set a flag and the my loop function is running

Code: Select all

if (checktempnow) {
  checktempnow = false; 
  doTempcheck();
}

ESP8266 Community Forum

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