4 replies to this topic

[Frode]

Hi, 

I'm working on a class for driving a servomotor with PWM, and I'm searching around for examples on how to use PWM.

 

In all the forumthreads and blogposts I find about PWM on the Netduino they refer to a signature that looks like this:

 

new PWM(PWMChannels, Int32, Float, Bool)

 

But the PWM class I find in SecretLabs.NETMF.Hardware.PWM.dll has a signature that looks like:

 

new PWM(Cpu.Pin).

 

I'm using 4.2 .NET MF, firmware 4.2.2.2 and version 4.2.2.0 of the PWM dll.

 

Has the PWM class been changed, or am I doing something weird?

[Chris Walker]

Hi Frode, Before .NET MF 4.2, there was no built-in PWM class in NETMF. So we made one. For backwards-compatibility, we still provide that older class as an add-on (in SecretLabs.NETMF.Hardware.PWM.dll). But most users will want to use the newer PWM class, found in Microsoft.SPOT.Hardware.PWM. Does that get you up and running? Chris

[Frode]

Aha, that was the missing piece. I removed my reference to the old SecretLabs.NETMF.Hardware.PWM.dll, and added a new reference to Microsoft.SPOT.Harware.PWM, and now I see the new PWM class.

 

Thank you Chris

[engvidal]

Dear Chris

 

When using the old SL, my pwm was at GPIO_PIN_D5 (on chip, pin 65, name PB8/Tim4_Ch3)

 

How may I reference it using the microsoft.spot.hardware.pwm ?

 

var led = new Microsoft.SPOT.Hardware.PWM( __PIN_NAME__ , 1000, 500, false);

 

thank You

[Chris Walker]

Hi engvidal, Use PwmChannels.PWM_PIN_D5. The PwmChannels enumeration should provide direct swaps for you. Chris