itsme

Just thought it would be worth noting since it wasn't obvious to me. Accessing the second channel is done by the setting the first byte in the array to 16 (0001 0000). See page 48 of the data sheet Volatile Wiper 1 Write Data. I also included the sample code I got to work. Maybe that will help someone in the future.

        public static void Main()
        {

            SPI.Configuration Device1 = new SPI.Configuration(
            Pins.GPIO_PIN_D10, // SS-pin
            false,             // SS-pin active state
            0,                 // The setup time for the SS port
            0,                 // The hold time for the SS port
            true,              // The idle state of the clock
            true,             // The sampling clock edge
            1000,              // The SPI clock rate in KHz
            SPI_Devices.SPI1   // The used SPI bus (refers to a MOSI MISO and SCLK pinset)
            );
            SPI SPIBus = new SPI(Device1);
                        
            while (true)
            {                
                byte[] WriteBuffer = new byte[2];
                WriteBuffer[0] = 0;
                WriteBuffer[1] = 0;
                SPIBus.Write(WriteBuffer);                
                WriteBuffer[0] = 16;
                WriteBuffer[1] = 0;
                SPIBus.Write(WriteBuffer);
                Thread.Sleep(1000);
                WriteBuffer[0] = 0;
                WriteBuffer[1] = 127;
                SPIBus.Write(WriteBuffer);
                WriteBuffer[0] = 16;
                WriteBuffer[1] = 127;
                SPIBus.Write(WriteBuffer);
                Thread.Sleep(1000);
            }
        }

Oops! Wow well looks like assumptions are still a bad idea. I switched the wires over to the actual channel 0 and BAM beautiful 0V-5V variations.Thanks a ton!

I'm pretty sure it's wired correct, but I have included a schematic of how everything is connected. You'll have to forgive the crudeness I'm still learning Eagle. I should also mention that I'm using a separate power source and 5V voltage regulator. When I measure the voltage between P1W and P1B I'm getting ~2.46 which is what I would expect from the 4.93V from the regulator.


The wires I am using are about 4 inches. I will try shortening the SPI connections a bit.

I do not have an oscilloscope but I'm assuming if I'm going to keep this up it would be a good investment. Any suggestions on a scope that would be good for a novice such as myself that wont completely drain the bank?

Thanks!

Ok, I changed those values (I should have read the wiki a little better ) and I'm still not getting anything. I have everything setup in a breadboard but I didn't add the decoupling capacitors to my circuit. At my current clock speed is that going to be a problem? Thanks!