deashute

Hi all,

I am a relative beginner when it comes to Netduino programming. I am attempting to use an Adafruit Motor Shield v2 with my Netduino Plus 2 to control two stepper motors. I've done a bit of research into the I2C protocol, but find myself somewhat confused about it's implementation, and how I can directly use it to control the steppers. Does anyone out there think they can help me to understand I2C's implementation?

Thanks,

Dean

I suppose I should also mention that I have, in searching the forums, found many an example of how to initialize an I2C device, however I am unsure of how to directly communicate with said device once initialized.

Hello all,

I am fairly new to Netduino programming, and am trying to work specifically with a project using stepper motors. I have:

• a Netduino Plus 2
• 2 Stepper Motors
• 1 AdaFruit Motor Shield v2.0

I have been trying to use a variant of the code from this blog post to program my Netduino and run the stepper motors, but currently am striking out.

http://blog.codeblac...ppermotors.aspx

I have looked through the forums, and found this topic here. It has been very helpful so far, but I have a new problem.

The first thing I realize was that the SecretLabs.NETMF.hardware references were defaulting to version 4.1, which I resolved fairly quickly by updating those references. Now that I've changed that though, I have been receiving an error on the Motorshield.cs file.

Lines 12 and 13 have been returning an error stating that "The expression being assigned to 'Codeblack.Micro.GettingStarted.MotorShield.MotorShield.PWM_0A' must be constant". Prior to updating the references, I received no such errors. Does anyone have any idea why this could have changed?
 

"public const Cpu.Pin PWM_0A = Pins.GPIO_PIN_D6; // M4
public const Cpu.Pin PWM_0B = Pins.GPIO_PIN_D5; // M3"

using System;using Microsoft.SPOT;using Microsoft.SPOT.Hardware;using SecretLabs.NETMF.Hardware.NetduinoPlus;namespace Codeblack.Micro.GettingStarted.MotorShield{    public class MotorShield    {        #region Constants        public const Cpu.Pin PWM_0A = Pins.GPIO_PIN_D6; // M4        public const Cpu.Pin PWM_0B = Pins.GPIO_PIN_D5; // M3        #endregion        #region Private fields        private static MotorShield instance = new MotorShield();        private byte latchState = 0x00;        private OutputPort motorLatch;        private OutputPort motorClock;        private OutputPort motorEnable;        private OutputPort motorData;        #endregion        #region Properties        public byte LatchState        {            get { return this.latchState; }        }        #endregion        #region Static properties        public static MotorShield Instance        {            get { return instance; }        }        #endregion        #region Constructor        private MotorShield()        {            this.motorLatch = new OutputPort(Pins.GPIO_PIN_D12, false);            this.motorClock = new OutputPort(Pins.GPIO_PIN_D4, false);            this.motorEnable = new OutputPort(Pins.GPIO_PIN_D7, false);            this.motorData = new OutputPort(Pins.GPIO_PIN_D8, false);        }        #endregion        #region Methods        internal void LatchTx(byte latchState)        {            this.latchState = latchState;            //LATCH_PORT &= ~_BV(LATCH);            this.motorLatch.Write(false);            //SER_PORT &= ~_BV(SER);            this.motorData.Write(false);            for (int i = 0; i < 8; i++)            {                //CLK_PORT &= ~_BV(CLK);                this.motorClock.Write(false);                int mask = (1 << (7 - i));                if ((this.latchState & mask) != 0)                {                    //SER_PORT |= _BV(SER);                    this.motorData.Write(true);                }                else                {                    //SER_PORT &= ~_BV(SER);                    this.motorData.Write(false);                }                //CLK_PORT |= _BV(CLK);                this.motorClock.Write(true);            }            //LATCH_PORT |= _BV(LATCH);            this.motorLatch.Write(true);        }        #endregion    }}

Thanks in advance,

Dean