[Panda II] Serialport only responds when debugging

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1

Hi

I’ve made a function that is suppose to find out the baud rate my GPS module is using. I just test every speed the GPS can use to see when I get a correct message. The problem I’m having is that the serial port only gets interrupts when I’m debugging. If I stop debugging and restart the Panda with the reset button the port no longer responds. I don’t understand how this could be.


private bool FindGPSBaudrate()
        {

            if(SP.IsOpen)
                SP.Close();
            SP.BaudRate = 4800;
            SP.Open();
            RMC = "not";
            Thread.Sleep(1200); // 1.2 second to receieve something on UART, GPS updates every second.
            if (RMC != "not")
                return true;

            SP.Close();
            SP.BaudRate = 9600;
            SP.Open();
            Thread.Sleep(1200);
            if (RMC != "not")
                return true;

            SP.Close();
            SP.BaudRate = 14400;
            SP.Open();
            Thread.Sleep(1200);
            if (RMC != "not")
                return true;

            SP.Close();
            SP.BaudRate = 19200;
            SP.Open();
            Thread.Sleep(1200);
            if (RMC != "not")
                return true;

            SP.Close();
            SP.BaudRate = 38400;
            SP.Open();
            Thread.Sleep(1200);
            if (RMC != "not")
                return true;

            SP.Close();
            SP.BaudRate = 57600;
            SP.Open();
            Thread.Sleep(1200);
            if (RMC != "not")
                return true;

            SP.Close();
            SP.BaudRate = 115200;
            SP.Open();
            Thread.Sleep(1200);
            if (RMC != "not")
                return true;
            return false;
        }

Thank you

2

I solved it. Apparently there’s a bug in the .NET MF core. The solution without flashing new firmware is simply to open the serial port before adding the event handler for receiving data.

3

Yes correct. Welcome to the community.