#include WiFi.h stops sketch running

Projects Programming
1

I'm unsure where to post this. I'm using an ESP32-C3 Zero with the IDE v 2,3,4
I've created a trivial sketch to show the problem, here it is

//#include <WiFi.h>

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  while (!Serial) delay(100);  // wait for native usb
  Serial.println("setup");
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.println("loop");
  delay(1000);
}

It compiles, loads and runs as you would expect, printing 'setup' and then 'loop' forever.
The problem is, if you uncomment the #include <WiFi.h>, it compiles and loads but produces no serial output whatsoever!
I'm completely at a loss as to what's going on.

2

I'm not very familiar with the esp32 but there might be an error in your code. You had:

I think the proper syntax for that would be:

while (!Serial) {
  delay(100);
}

So that might somehow be effecting your output.

1 Like
3

There is no difference between those two while loops. One statement does note require curly braces....

4

Thanks for the suggestion but as pointed out my syntax is correct. If it were not, it would not compile. BUT, as this seems so odd to me, I did try adding the curly braces and they made no difference.

I had a look at WiFi.h but debugging it is not easy.

I was a bit concerned that perhaps the sketch was in fact running and it was just the Serial that was broken so I added code to flash the internal LED. The sketch is NOT running at all when WiFi.h is included. Even though I'm not calling any WiFi code at all!

5

Aha!
I've now found that I can make the sketch run by adding the line
WiFi.mode(WIFI_STA);
before the
Serial.begin(115200);

I speculate that you must somehow initialise something in WiFi before Serial will work. That seems wrong to me.

6

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