[En-Nut-Discussion] Re: En-Nut-Discussion Digest, Vol 34, Issue 7
Raul Valle
rvl180 at hotmail.com
Mon Aug 7 22:21:43 CEST 2006
for the moment i am simply sending a pwm code to rc standard servos for a
car
----- Original Message -----
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To: <en-nut-discussion at egnite.de>
Sent: Monday, August 07, 2006 3:16 AM
Subject: En-Nut-Discussion Digest, Vol 34, Issue 7
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> Today's Topics:
>
> 1. RE:PWM (Raul Valle)
> 2. RE: PWM (Raul Valle)
> 3. Re: RE: PWM (Nic Cave-Lynch)
> 4. Re: PWM (Curtis Maloney)
> 5. PPP Sample (Andrey G. Polenov)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 6 Aug 2006 12:06:15 -0700
> From: "Raul Valle" <rvl180 at hotmail.com>
> Subject: [En-Nut-Discussion] RE:PWM
> To: <en-nut-discussion at egnite.de>, <Michael.e.Jones at web.de>
> Message-ID: <BAY21-DAV738186F0975065777910B9E560 at phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Michaels thanks for the help.
>
> The thing is i have to control around 8 to 10 servos which are for
> controlling
> a robotic arm for a rover and to control a camera. The servos are going
> to be control by a software that is going to send some characters and with
> those i will give an order to the servos. I was reading about the Nutsleep
> and you are right , that why i am switching better to NutDelay and is
> making the delay but, i think that with a delay of 2us i should not be
> noticing because it should be very fast, but it seems the delay is longer
> because for now , testing i send from the ethernut a word , then i make
> the delay and then send another word and it seems the delay is longer
> than 2us. I am not using the pwm channel because there are so many
> servos that i have to come up with something else fast enough that all the
> servos seem to be working i guess at the same time.
>
> any help is going to be appreciated it.Thanks
>
>
> ...........................................................
> Message: 6
> Date: Thu, 3 Aug 2006 14:15:52 -0700
> From: "Raul Valle" <rvl180 at hotmail.com>
> Subject: [En-Nut-Discussion] ethernut--pwm
> To: <en-nut-discussion at egnite.de>
> Message-ID: <BAY21-DAV4A18599B9490158CA459D9E530 at phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
>
> hi to all:
> can someone give me an idea on how to make a servo function on ethernut1.3
> .
> The one i did i dont know exactly why is not working . here is the code:
> pos++;
> sbi(PORTE,2);
> for(i=0;i<pos;i++){
> NutSleep(.02);
> }
>
> cbi(PORTE,2);
> for(b=0;i<(1500-pos);b++){
> NutSleep(.02);
>
> ------------------------------
>
> Message: 7
> Date: Thu, 3 Aug 2006 23:38:14 +0200
> From: "Michael Jones" <Michael.e.Jones at web.de>
> Subject: RE: [En-Nut-Discussion] ethernut--pwm
> To: "'Ethernut User Chat (English)'" <en-nut-discussion at egnite.de>
> Message-ID: <008501c6b745$2081ed10$de10a8c0 at LSB.lan>
> Content-Type: text/plain; charset="us-ascii"
>
>
> Hi,
>
> I think you have got a few problems to solve here. The first being that
> NutSleep(...) does not take a float (well not that I am aware off) so that
> 02 turns into 0. The second being that you can't use NutSleep(...) to
> generate deterministic time slices as NutSleep(...) will pass control to
> another thread and will only return when that thread (and/or others)
> yields
> CPU time back to your thread by itself calling NutSleep(...) or similar
> functions.
>
> What exactly are you trying to implement?
>
> Depending on the actually method you are using to control the servo there
> are different solutions. Are you using an ADC? Then you might want to use
> an
> ADC completion interrupt handler which then decides if and which direction
> the motor is supposed to run.
>
> Regards,
> Michael
>
>
> ------------------------------
>
> Message: 2
> Date: Sun, 6 Aug 2006 12:47:56 -0700
> From: "Raul Valle" <rvl180 at hotmail.com>
> Subject: [En-Nut-Discussion] RE: PWM
> To: <en-nut-discussion at egnite.de>, <cmaloney at cardgate.net>
> Message-ID: <BAY21-DAV229AF924A160E855B27579E560 at phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Curtis thanks for the reply:
>
> The thing is the channels available are not enough, there are more servos
> to control......they are going to be controlled by a command sent to them
> from the computer .... any idea in how to achieve to control all the
> servos not affecting program please let me know... I appriciate the help./
>
> ---------------------------------------------------
> Raul Valle wrote:
>> hi to all:
>> can someone give me an idea on how to make a servo function on
>> ethernut1.3 .
>> The one i did i dont know exactly why is not working . here is the code:
>> pos++;
>> sbi(PORTE,2);
>> for(i=0;i<pos;i++){
>> NutSleep(.02);
>> }
>>
>> cbi(PORTE,2);
>> for(b=0;i<(1500-pos);b++){
>> NutSleep(.02);
>
> Is there a particular reason you're avoiding using the hardware PWM?
> They'd be
> much simpler, more accurate, and would take no CPU time once set up.
>
> Of course, if they're all already in use, or you have to use a pin they
> can't
> control, I'll understand.
>
> --
> Curtis Maloney
> cmaloney at cardgate.net
>
>
>
> ------------------------------
>
> Message: 3
> Date: Mon, 07 Aug 2006 08:44:06 +1200
> From: Nic Cave-Lynch <nic at tymar.com>
> Subject: Re: [En-Nut-Discussion] RE: PWM
> To: "Ethernut User Chat (English)" <en-nut-discussion at egnite.de>
> Message-ID: <44D65496.6040201 at tymar.com>
> Content-Type: text/plain; format=flowed; charset=ISO-8859-1
>
> What pulse width resolution do you need, and what frequency? Are you doing
> all
> the PID stuff in the Ethernut, or just sending a pwm code to something
> like
> standard RC servos used in model cars/planes/yachts/...?
>
> Raul Valle wrote:
>> Curtis thanks for the reply:
>>
>> The thing is the channels available are not enough, there are more servos
>> to control......they are going to be controlled by a command sent to them
>> from the computer .... any idea in how to achieve to control all the
>> servos not affecting program please let me know... I appriciate the
>> help./
>>
>> ---------------------------------------------------
>> Raul Valle wrote:
>>> hi to all:
>>> can someone give me an idea on how to make a servo function on
>>> ethernut1.3 .
>>> The one i did i dont know exactly why is not working . here is the code:
>>> pos++;
>>> sbi(PORTE,2);
>>> for(i=0;i<pos;i++){
>>> NutSleep(.02);
>>> }
>>>
>>> cbi(PORTE,2);
>>> for(b=0;i<(1500-pos);b++){
>>> NutSleep(.02);
>>
>> Is there a particular reason you're avoiding using the hardware PWM?
>> They'd be
>> much simpler, more accurate, and would take no CPU time once set up.
>>
>> Of course, if they're all already in use, or you have to use a pin they
>> can't
>> control, I'll understand.
>>
>> --
>> Curtis Maloney
>> cmaloney at cardgate.net
>>
>> _______________________________________________
>> En-Nut-Discussion mailing list
>> En-Nut-Discussion at egnite.de
>> http://www.egnite.de/mailman/listinfo.cgi/en-nut-discussion
>>
>
>
> ------------------------------
>
> Message: 4
> Date: Mon, 07 Aug 2006 10:12:33 +1000
> From: Curtis Maloney <cmaloney at cardgate.net>
> Subject: [En-Nut-Discussion] Re: PWM
> To: Raul Valle <rvl180 at hotmail.com>
> Cc: en-nut-discussion at egnite.de
> Message-ID: <44D68571.2070602 at cardgate.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Raul Valle wrote:
>> Curtis thanks for the reply:
>>
>> The thing is the channels available are not enough, there are more servos
>> to control......they are going to be controlled by a command sent to them
>> from the computer .... any idea in how to achieve to control all the
>> servos not affecting program please let me know... I appriciate the
>> help./
>>
>
> All I can suggest is you look at the PWM series of AVRs (listed as
> "Lighting"
> AVRs on the web site). According to the site, the AT90PWM3 has 10-channel
> "advanced" PWM, though I haven't looked closely at what that entails.
>
> --
> Curtis Maloney
> cmaloney at cardgate.net
>
>
> ------------------------------
>
> Message: 5
> Date: Mon, 07 Aug 2006 09:24:48 +0600
> From: "Andrey G. Polenov" <apolenov at adc.kz>
> Subject: [En-Nut-Discussion] PPP Sample
> To: "Ethernut User Chat (English)" <en-nut-discussion at egnite.de>
> Message-ID: <44D6B27F.30403 at adc.kz>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Good afternoon!
> At me connection in ppp.c (example) is not connect my provider
> I use Ethernut 2 and ethernut-4.1.9-rc7
> P.S. In ethernut-4.0.3 at me problems were not
>
>
> ------------------------------
>
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