PWM Sample Code?
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PWM Sample Code?
by David Rye
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Can anyone point me at gumstix PWM sample code, preferably in C? |
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Re: PWM Sample Code?
by Dave Hylands
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Hi guys,
>> Can anyone point me at gumstix PWM sample code, preferably in C? > > I was wondering that myself, since: > http://docswiki.gumstix.com/index.php?title=Sample_code/C/PWM&action=edit > > is missing the actual code! :) That's because nobody has yet create the PWM page :) Are you looking for PWM for the purposes of controlling something like a backlight? Or PWM code for controlling somehing like an R/C servo? -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ gumstix-users mailing list gumstix-users@... https://lists.sourceforge.net/lists/listinfo/gumstix-users |
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Re: PWM Sample Code?
by Dave Hylands
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Hi David,
> > That's because nobody has yet create the PWM page :) > > Well, that makes sense, but shouldn't it say something other than: > "The action you have requested is limited to users in the group user." > > It would be less confusing! :) Yeh - what's happening is that when you create a page and put a wiki link to a non-existant page, then they expect that you're going to want to create the page, so the link is actually a link to "Edit the page named PWM". In order to edit a page, you need to be logged in. So that's why it is the way it is. You could login and create an empty placeholder page to get rid of that :) > > Are you looking for PWM for the purposes of controlling something like > > a backlight? > > Or PWM code for controlling somehing like an R/C servo? > > I'm just looking for examples on playing with the memory mapped registers and GPIO from with C. Then the GPIO example code should do what you want. <http://docswiki.gumstix.com/index.php/Sample_code/C/gpregs> Just change: #ifdef __ARM_EABI__ 0x40E00000 / MAP_SIZE #else 0x40E00000 & ~MAP_MASK #endif to be 0x40E00000 & ~MAP_MASK > Controlling an R/C servo would be fine for me. > > I did come across this: > paxRC - R/C and robotics software for Linux/PXA255/PXA270 > http://www.pabr.org/pxarc/doc/pxarc.en.html Yeah - that's what I was going to point you to if it was R/C servos you were interested in. -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ gumstix-users mailing list gumstix-users@... https://lists.sourceforge.net/lists/listinfo/gumstix-users |
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Re: PWM Sample Code?
by Michael Caughey
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Whom ever does log in and create te page, can we place some sample code
there too, :-) I'm heading down that road and will be needing it soon enough. If not i'll see what I can do after figuring it out, but that will be a while. -Michael ----- Original Message ----- From: "Dave Hylands" <dhylands@...> To: "General mailing list for gumstix users." <gumstix-users@...> Sent: Wednesday, May 21, 2008 1:08 PM Subject: Re: [Gumstix-users] PWM Sample Code? > Hi David, > >> > That's because nobody has yet create the PWM page :) >> >> Well, that makes sense, but shouldn't it say something other than: >> "The action you have requested is limited to users in the group user." >> >> It would be less confusing! :) > > Yeh - what's happening is that when you create a page and put a wiki > link to a non-existant page, then they expect that you're going to > want to create the page, so the link is actually a link to "Edit the > page named PWM". In order to edit a page, you need to be logged in. > > So that's why it is the way it is. You could login and create an empty > placeholder page to get rid of that :) > >> > Are you looking for PWM for the purposes of controlling something like >> > a backlight? >> > Or PWM code for controlling somehing like an R/C servo? >> >> I'm just looking for examples on playing with the memory mapped >> registers and GPIO from with C. > > Then the GPIO example code should do what you want. > <http://docswiki.gumstix.com/index.php/Sample_code/C/gpregs> > > Just change: > > #ifdef __ARM_EABI__ > 0x40E00000 / MAP_SIZE > #else > 0x40E00000 & ~MAP_MASK > #endif > > to be > 0x40E00000 & ~MAP_MASK > >> Controlling an R/C servo would be fine for me. >> >> I did come across this: >> paxRC - R/C and robotics software for Linux/PXA255/PXA270 >> http://www.pabr.org/pxarc/doc/pxarc.en.html > > Yeah - that's what I was going to point you to if it was R/C servos > you were interested in. > > -- > Dave Hylands > Vancouver, BC, Canada > http://www.DaveHylands.com/ > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2008. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > gumstix-users mailing list > gumstix-users@... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ gumstix-users mailing list gumstix-users@... https://lists.sourceforge.net/lists/listinfo/gumstix-users |
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Re: PWM Sample Code?
by David Rye
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Hi Dave,
I was just after a simple example that shows how to configure the hardware and set base frequency and duty cycle.
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Re: PWM Sample Code?
by Chris Dollar
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I used this bit of code in the past in an init script to set the contrast on an lcd I had connected to my connex. I got the code originally from a post to the list iirc...
PXAREGS=/usr/sbin/pxaregs start() { echo "Setting LCD contrast on PWM1" # set GPIO to AF2 $PXAREGS GAFR0U_17 2 # as an output $PXAREGS GPDR0_17 1 # set the period $PXAREGS PWMPERVAL1 375 # set the prescale to 0 $PXAREGS PWMCTL1_PRESCALE 0 # configure it for a graceful shutdown $PXAREGS PWMCTL1_SD 0 # set FDCYCLE to 0 $PXAREGS PWMDUTY1_FDCYCLE 0 # and set the duty cycle $PXAREGS PWMDUTY1_DCYCLE 200 # and turn on the PWM clock $PXAREGS CKEN_1 1 # done! } Hope this helps. Chris On Wed, May 21, 2008 at 3:49 PM, David Rye <d.rye@...> wrote:
------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ gumstix-users mailing list gumstix-users@... https://lists.sourceforge.net/lists/listinfo/gumstix-users |
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