Re: PWM Driver

From: Geoff Smith (smith.geoffrey_at_fixme.comcast.net)
Date: 03/30/04 

Date: Tue, 30 Mar 2004 14:22:42 -0800

David -
    Streams drivers are very common across several operating systems. The
API they expose allows them to be accessed via a file-like set of functions.
The MSDN and Platform Builder docs describe them quite well. RegisterDevice
has been replaced by ActivateDeviceEx. When you call this function your PWM
driver PWM_Init should get called.

CreateFile will call PWM_Open
WriteFile - PWM_Write
ReadFile - you get the picture.

The catch all is DeviceIoControl - you use this for everything not
applicable to the other stream APIs.

Points to note:
-Your ini function should be PWM_Init not PWM_INIT
-You should export your entry points in a DEF file
-You can load your driver at boot time using the HKLM\Builtin key
- Don't be afraid to read the MSDN and PB docs
- Consider attending a CE training course 

-- 
Geoff Smith
eMVP
==
"David V" <davev@> wrote in message
news:%23GyDRTpFEHA.3540@TK2MSFTNGP09.phx.gbl...
> I am trying to write a dll for a PWM driver. I am using Platform Builder
4.2
> for the x-scale.
>
> When i try to register the dll I use the code below and get error type 1.
>  dll = RegisterDevice(L"PWM", 1, L"pwm.dll", 0);
>
>
> In my dll project I have a init function, PWM_INIT.
>
>
> What should the signature be for this function? I have seen 3 different
> signatures. One with 2 input parameters, One that returns a BOOL. One that
> returns a DWORD handle.
>
> What should the handle be if all i want to do I use PWM_IOControl?
>
> There don't seem to be an good examples on how to write a driver. All the
> examples are poorly commented and extremely confusing.
>
>
> Dave V.
>
>

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