2 replies to this topic

[Poroh-kun]

SecretLabs.NETMF.Hardware.PWM pwm = new SecretLabs.NETMF.Hardware.PWM(Pins.GPIO_PIN_D7);
const uint period = 3 * 1000 * 1000;   // 3 ms
const uint duration = 2 * 1000 * 1000;  // 2 ms
pwm.SetPulse(period, duration);

(from here: http://10rem.net/blo...-modulation-pwm )

 

When i deploy this code, device passes in a state, where i cannot deploy any other projects.

 

It shows "Preparing to deploy asseblies to the device" for long time and then error "Unable to communicate with device - USB:Netduino".

 

When i reattaching usb cable it sends by serial port this:

 

EXCEPTION 0x05:
  cpsr=0x21000000
  pc  =0x08045306
  lr  =0x08048d17
  sp  =0x2001fc90
  r00 =0x4001fc04
  r01 =0x00000000
  r02 =0x00000001
  r03 =0xf0000000
  r04 =0x40010400
  r05 =0x00000000
  r06 =0xffffffff
  r07 =0x00000002
  r08 =0x20001764
  r09 =0x20001130
  r10 =0x00000000
  r11 =0x00000000
  r12 =0xf0000000

 

 

reflashing firmware returns it to normal mode, but what is it? How can I use PWM without this problems?

[Lunddahl]

This might help:

 

Remember to a a reference to: Microsoft.SPOT.Hardware.PWM

 

 

using System.Threading;using Microsoft.SPOT.Hardware;using SecretLabs.NETMF.Hardware.Netduino;namespace NP2.Examples_PWM{    public class Program    {        static PWM led1;        public static void Main()        {            led1 = new PWM(PWMChannels.PWM_ONBOARD_LED, 1000, .5, false);                        led1.Frequency = 1000;            led1.DutyCycle = .5;            led1.Start();                        while (true)            {                double startValue, endValue;                for (startValue = 4.712; startValue < 10.995; startValue = startValue + 0.1)                {                    endValue = System.Math.Sin(startValue) * .5 + .5;                    led1.DutyCycle = endValue;                    Thread.Sleep(10);                }            }        }    }} 

- Ulrik Lunddahl

[Poroh-kun]

oh.. thanks, but i was already found the problem.

i was conflict between this:

static OutputPort[] leds = new OutputPort[7]{	    new OutputPort(Pins.GPIO_PIN_D7, false),	    new OutputPort(Pins.GPIO_PIN_D8, false),	    new OutputPort(Pins.GPIO_PIN_D9, false),	    new OutputPort(Pins.GPIO_PIN_D10, false),	    new OutputPort(Pins.GPIO_PIN_D11, false),	    new OutputPort(Pins.GPIO_PIN_D12, false),	    new OutputPort(Pins.GPIO_PIN_D13, false)};

and this:

PWM pwm = new PWM(Pins.GPIO_PIN_D10);

 

there are two items on D10.. omg, i so sad..