ESP8266 Community Forum

- Sun Apr 24, 2016 12:11 pm #46085 Hello,

I am trying to write a little bit bang code to send uart data out some io pins.
Everytime I load it it spits out wifi connection status out uart, after the garbage data of course.
So I am a bit concerned that this thing is running more than just the code I am trying to upload. Is there some way to erase the flash and only run the code I upload. I just want some minimal code for testing then add in wifi stuff later.

I have noticed that it only does this when I init the serial port. And it sends out the debug info from there server demo sketch. I am wondering why that code is running when I don't load that sketched. I removed all the extra code and found that this little code below shows the problem.

CODE:

Code: Select allvoid setup() {
pinMode(5,OUTPUT);   //Pin24 GPIO5

  Serial.begin(115200);

}

void loop()
{
  digitalWrite(5, LOW);   // Turn LED OFF
  delay(1000);                       
  digitalWrite(5, HIGH);  // Turn LED ON
  delay(1000);
 
}



So when i run that I get the following out the uart I purposely messed up my router info in the server sketch and uploaded it to the esp before uploading this sketch to confirm it was any of the demo sketches.
Garbage data would not paste into here but here is the rest.

no HOME-D811 found, reconnect after 1s
reconnect
f 0, scandone
no HOME-D811 found, reconnect after 1s
reconnect
f -180, scandone

I am using

Sparkfun Think dev board
I am using Arduino1.6.5
http://arduino.esp8266.com/versions/2.1 ... index.json

If anyone has a similar issue I would be interested to know if there is a work around.
Is there an erase flash option or something so that now old sketches are running? It looks like the wifi config part of the binary does not get erased properly when running minimal sketches for some reason.

Thanks

- Mon Apr 25, 2016 7:33 am #46148 Looks to me like you haven't been successful in uploading your sketch and the code installed when you purchased it is still running.

- Mon Apr 25, 2016 11:48 pm #46211 lol i had the generic esp8266 board selected...selected thing dev board fixed that issue....probably because that is the one that I am using...fail on to some more problems...So you were basically right...Thanks