G30 SPI implementation question

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#1

Hello,

I had am trying to use the SPI communication on my G30 TH module. I am following the example on this link:

https://www.ghielectronics.com/docs/14/spi

but, when i try to deploy the code to my G30, i get the follwoing error

A first chance exception of type ‘System.InvalidOperationException’ occurred in Microsoft.SPOT.Hardware.dll
An unhandled exception of type ‘System.InvalidOperationException’ occurred in Microsoft.SPOT.Hardware.dll

The following is my code


using System;
using System.Threading;
using Microsoft.SPOT;
using Microsoft.SPOT.Hardware;

using GHI.Pins;

namespace NETMFBook
{
    public class Program
    {
        public static void Main()
        {
SPI.Configuration Dig_Setpoint_SPI = new SPI.Configuration(GHI.Pins.G30HDR.Gpio.PC10,
                false,      // ChipSelect Active State
                0,          // CLK Setup Time
                0,          // CLK Hold Time
                true,       // Clock Idle State
                false,      // Clock Edge 
                1000,       // Clock Rate kHz
                SPI.SPI_module.SPI2);

            
            SPI MySPI = new SPI(Dig_Setpoint_SPI);

            ushort[] Wiper_Pos_EN = new ushort[] { 0x1802 };
            ushort[] Dig_Setpoint_25C = new ushort[] { 0x0600 }; // Halfway Point
            ushort[] Dig_Setpoint_1 = new ushort[] { 0x0500 }; // 1/2 scale
            ushort[] Dig_Setpoint_2 = new ushort[] { 0x0700 }; // 3/4 scale
            ushort[] rx_data = new ushort[1];

            MySPI.Config = Dig_Setpoint_SPI;

            MySPI.WriteRead(Wiper_Pos_EN, rx_data);
            MySPI.WriteRead(Dig_Setpoint_25C, rx_data);


            Debug.Print("Done");
        }
    }
}

I think the problem comes when the following tries to run

SPI MySPI = new SPI(Dig_Setpoint_SPI);

Any idea why that would be?

Thank You

#2

That kind of error, at that point in code, is usually because something is wrong in the setup of the object, in your case the SPI port. I’d go back and verify that you have the correct settings in the SPI line above.
I’d also suggest you use
GHI.Pins.G30.SpiBus.Spi2 as that’s reasonably explicit, I don’t expect that using SPI.SPI_module.SPI2 is any different but I always prefer to use the GHI object.