4 replies to this topic

[Andrew Johnson]

I have an original netduino which I haven't used for about a year. Today I dug it out and deployed some software that I wrote a while back that drives an hd44780 lcd panel. This used to work, but now doesn't.

 

In investigating this I found some strange behaviour with the gpio pins. If I have program with a simple loop that repeatedly alternates GPIO0 between high and low with a short delay, this actually affects GPIO3. Changing the pin ID sometimes has no effect and other times affects a completely different pin.

 

My question: is there an explanation for this apart from some kind of hardware damage? The board is screwed onto a baseboard and has just been sat on my desk. I don't think it has been handled.

 

It will respond to pings and blink the on-board led, so its not completely dead. I tried re-flashing it with 4.1.0.6 but that didn't help.

 

Any thoughts? should I just toss it an buy a netduino 2.

 

Thanks, Andy.

[Stefan]

Hi Andy and welcome to the Netduino forums!

 

Just want to be sure, did you use the correct pin enumeration? This is a common mistake I often make myself too;

Debug.Print(SecretLabs.NETMF.Hardware.Netduino.Pins.GPIO_PIN_D0.ToString()); // 27Debug.Print(Microsoft.SPOT.Hardware.Cpu.Pin.GPIO_Pin0.ToString());           //  0Debug.Print(SecretLabs.NETMF.Hardware.Netduino.Pins.GPIO_PIN_D3.ToString()); //  1Debug.Print(Microsoft.SPOT.Hardware.Cpu.Pin.GPIO_Pin3.ToString());           //  3

The SecretLabs enumeration is the correct one

[Andrew Johnson]

Hi Stefan, and thanks for your help.

 

Yes, I was using the Microsoft.SPOT.Hardware.Cpu.Pin enumeration in my test program. Changing it to the SecretLabs enum gives me the results I was expecting. Thanks for that!

 

Unfortunately my lcd driver uses the correct enum, so its problems lie elsewhere. But at least I'm not utterly confused now...

 

Thanks again, Andy.

[Paul Newton]

Hi Andy,

 

Do you have a way to test the LCD panel? (without using the Netduino)

 

Paul

[Chris Walker]

Hi Andy, How hard was it screwed down? I've never seen it happen, but I suppose that it's possible to damage any circuit board traces if it is bent for a long period of time. All of the digital pins should be independent. Chris