I'm getting a RED LED starting my program. It only happens when I have a UDP object exposed

Troubleshooting
1

ON powerup or reset, I get the following LED pattern:
White
Green
Cyan slow flash
Cyan quick flash (sometimes)
Red flash
repeat

I had a global UDP object, which I thought might be causing problems (maybe on class initialization it causes problems?). It was being initialized in setup().

Then I moved it into something like this:

static UDP Udp;
static bool first = true;
if (first)
{
    UDP.begin(port);
    first = false;
}

I still have the same problems.

I’ve made a different UDP program work just fine (from another post about this kind of problem, where I was seeing my own packets).

What does the Red LED flashing mean? If I comment out all the UDP stuff it works great. If I write something simple with UDP it works great. It is only when I add the UDP stuff to my existing code (which works without the UDP stuff), I end up with this cycle of (apparent) resets.

Am I running out of RAM or something like that? Or stack space?

Thanks!

2

HI Again,

The red flashes are panic codes recently added to core firmware. You should see SOS flashed out (three short, three long, three short) followed by a number of flashes that you count and then SOS again. The number of flashes tells you the fault. I went to look for the list here in the forum because I know it was posted but I found them in the source quicker:

def_panic_codes(Faults,RGB_COLOR_RED,HardFault) // 1
def_panic_codes(Faults,RGB_COLOR_RED,NMIFault)  // 2
def_panic_codes(Faults,RGB_COLOR_RED,MemManage)
def_panic_codes(Faults,RGB_COLOR_RED,BusFault)
def_panic_codes(Faults,RGB_COLOR_RED,UsageFault)

def_panic_codes(Cloud,RGB_COLOR_RED,InvalidLenth)

def_panic_codes(System,RGB_COLOR_RED,Exit)
def_panic_codes(System,RGB_COLOR_RED,OutOfHeap)

def_panic_codes(System,RGB_COLOR_RED,SPIOverRun)

def_panic_codes(Softare,RGB_COLOR_RED,AssertionFailure)
def_panic_codes(Softare,RGB_COLOR_RED,InvalidCase)

Sometimes there is a fault during a fault and the whole panic code does not come out.

All that said, the most common reason would be that your program is out of RAM.

3

@bko thanks.

I figured the problem out. I was simply using too much RAM.

I’ve reduced my footprint and all is well.

I even have my UDP broadcasts going out properly.

Thanks for all your help.

Regards,

mgessnr

1 Like