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Riaan Mastenbroek

Member Since 01 May 2015
Offline Last Active Oct 03 2016 05:54 PM

Topics I've Started

GPRS Shield V2 Power Down

07 June 2015 - 06:44 AM



I have a GPRS Shield V2 and need some assistance with the power down - perhaps someone can help. For some reason the GPRS Shield freezes and I want to power it down and up again. 


Here is what I did:


1. ) If I push the reset button on the netduino it does not reset the GPRS Shield.

2.) I soldered the JP pads on the GPRS Shield together in order to allow me to power up / down via Pin 9

3.) I add the following code to my project:


var gprsPwr = new OutputPort(Pins.GPIO_PIN_D9, false);
4.) Nothing happens when the code executes?
5.) When I push Reset on the GPRS shield using the push button - nothing happens and the shield does not seem to power down?
What am I doing wrong - Any Ideas?



05 June 2015 - 07:00 AM



I have a strange problem when running my Netduino. For some reason it seems like a thread to read smsses from my GPRS shield just hangs the board at any interval. It might run 2 hours or 30 mins but then it seems like all the threads just stops.


I have read some posts on watchdogs and more specifically the hardware watchdog.


Are there any available in the market to buy or what would you recommend. I would not like to put this at a client and have to reset the device every now and then.



SerialPort BytesToRead only ever returns 256

25 May 2015 - 07:25 PM



For some reason my serialport only ever returns no more than 256 bytes if I run this code after I did a write:


while (_modemConnection.BytesToRead > 0)
                    response += (char)_modemConnection.ReadByte();
                return response;
How can I get the next 256 and so on...I know there is way more to come and I can see only a part of the expected string.

System.Exception when I now run my code after upgrade to 4.3

13 May 2015 - 10:29 PM



When I run my code that worked fine in 4.2 on my Netduino Plus 2 I now get this error on my Netduino 3 :


A first chance exception of type 'System.Exception' occurred in Microsoft.SPOT.Hardware.dll. When I continue I get this error:


An unhandled exception of type 'System.NullReferenceException' occurred in Netduino.IP.LinkLayers.CC3100


It seems like this error happens in the Main method after approx 200-500 ms.


Any Ideas....I would hate to revert back.





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