Hard fault in manual system mode [Solved]

Troubleshooting
1

I’m tryout the manual system mode, and whenever I call connect it immediately goes to the blinking red hard fault mode. Any ideas? Here’s the code:

SYSTEM_MODE(MANUAL);

int i;
   
void setup() {
    Serial.begin(9600);
    while (!Serial.available()) ;

}

void loop() {
    if (Spark.connected() == false) {
        Spark.connect();
        Spark.process();
    }
    for (i=0; i<=4; i++) {
        Serial.println(i);
        delay(1000);
    }
    Spark.process();
}
2

I think I’m having the same problem. I tried semi-auto mode in my project and got flashing red. I ran your code and got flashing red also. Then I tried running the semi-auto example code straight from the blog post and had some really strange things happen. To start with I got breathing green when it connected. It showed up as being online with spark list, but I couldn’t flash anything to it from the web IDE. Then I happened to try clearing the WiFi credentials so it went into listening mode when it tried to connect. After I sent it the credentials again, I got breathing blue and it did the same thing as the breathing green. Even after I reset the Core, it was still breathing blue.

3

Ok. Found the cause of the SOS issue.
It was the immediate call to Spark.process() after Spark.connect(). Please remove the process() call within the if(){ } and it should work.
I’m going to add a check for the cloud socket in Spark.process() to prevent this bug in future firmware release.
Thanks for pointing out the issue.

4

Fix over here: https://github.com/spark/core-firmware/commit/cd0a99db152fba7c8ff2ef6d30f6f10e897eecba

1 Like