[En-Nut-Discussion] Register/Message Queue Bugs
Josh Arnold
jarnold at atterotech.com
Wed Aug 9 21:21:28 CEST 2006
Hello all-
I am running into a bug that appears to be affecting any data that uses
registers 24 and 25.
The data in these registers seems to be written or corrupted after we
implemented Nut Os message queues.
Has anyone had similar issues when using message queues?
Josh Arnold
-----Original Message-----
From: en-nut-discussion-bounces at egnite.de
[mailto:en-nut-discussion-bounces at egnite.de]On Behalf Of Raul Valle
Sent: Monday, August 07, 2006 4:22 PM
To: en-nut-discussion at egnite.de
Subject: [En-Nut-Discussion] Re: En-Nut-Discussion Digest, Vol 34, Issue
7
for the moment i am simply sending a pwm code to rc standard servos for a
car
----- Original Message -----
From: <en-nut-discussion-request at egnite.de>
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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> End of En-Nut-Discussion Digest, Vol 34, Issue 7
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