... I also tried :

Signal 'name3' can not add OUT pin 'mirror.0.enable', it already has I/O
pin 'ppmc.0.encoder.07.index-enable'
Signal 'name3' can not add OUT pin 'mirror.0.enable', it already has I/O
pin 'ppmc.0.encoder.07.index-enable'
    while executing
"hal net name3 ppmc.0.encoder.07.index-enable mirror.0.enable"
    ("eval" body line 1)
    invoked from within
"eval hal $what"
    (procedure "showEx" line 2)

On Thu, May 17, 2018 at 10:03 AM, Maxime Lemonnier <
maxime.lemonn...@gmail.com> wrote:

> Thanks andy,
>
> I have issues interfacing with index-enable with hal's net command. right
> no I have :
>
> net name1 mirror.0.index ppmc.0.encoder.07.index
> net ppmc.0.encoder.03.position => mirror.0.actual
> net name2 ppmc.0.encoder.07.position => mirror.0.mirror
>
> and my miror.comp code is
> --------------------------
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> *component mirror "index-enable hack";pin in bit index;pin in float
> actual;pin in float mirror;pin out bit enable;pin out float
> result;function_;license "GPL"; // indicates GPL v2 or later;;if(index ==
> 1){    result = actual - mirror;    enable = 1;}*
>
> ---------------------------
>
> I don't see why I would need a state, but more on that later.
>
> The code work "once" when I manually execute : setp
> ppmc.0.encoder.07.index-enable 1
>
> But what I need is for ppmc.0.encoder.07.index-enable to be re-enabled at
> each servo cycle.
>
> I would also prefer ppmc.0.encoder.07.position to be reset to
> ppmc.0.encoder.07.position right after, but I don't think it is possible,
> so I will do this in post treatment
>
> Anyways the plan is to capture mirror.0.out in halscope along with both
> encoder positions. I should have everything I want to infer
> ppmc.0.encoder.07.position's at the time my trgigger is pulsed.
>
> the thing is, I can't seem to use index-enable with the net command. HAL
> sends me errors no matter what I try.
>
> for example:
>
> Signal 'name3' can not add I/O pin 'ppmc.0.encoder.07.index-enable', it
> already has OUT pin 'mirror.0.enable'
> Signal 'name3' can not add I/O pin 'ppmc.0.encoder.07.index-enable', it
> already has OUT pin 'mirror.0.enable'
>     while executing
> "hal net name3 mirror.0.enable ppmc.0.encoder.07.index-enable"
>     ("eval" body line 1)
>     invoked from within
> "eval hal $what"
>     (procedure "showEx" line 2)
>
>
> On Thu, May 17, 2018 at 9:24 AM, andy pugh <bodge...@gmail.com> wrote:
>
>> On 17 May 2018 at 13:34, Maxime Lemonnier <maxime.lemonn...@gmail.com>
>> wrote:
>>
>> > I would like to configure HAL to simply zero-out channel 7 when it
>> receives
>> > the trigger pulse, then I would write a comp that output the position at
>> > which the trigger was pulsed using the delta between encoder 3 and 7.
>>
>> If you are writing a custom .comp then I would source the index-enable
>> signal from that.
>>
>> It isn't clear from your description precisely when you want this to
>> happen, but I imagine that choosing the conditions is also something
>> easiest inside the custom component.
>>
>> HAL comps for jobs like this tend to be coded as a state machine:
>>
>> pin out signed state = 0;
>> pin in float input1;
>> pin in float input2;
>> pin out float output;
>> ...
>> ;;
>> switch state{
>> case 0: //readiness state
>> if (conditions){
>>     state = 1;
>>     index_enable = 1;
>> }
>> case 1: // waiting for index
>> if (! index_enable){
>>     state = 2;
>>     output = input1 - input2;
>>     state = 2;
>> }
>> case 2: // we don't really need this state
>>     state = 0;
>> }
>>
>>
>> --
>> atp
>> "A motorcycle is a bicycle with a pandemonium attachment and is
>> designed for the especial use of mechanical geniuses, daredevils and
>> lunatics."
>> — George Fitch, Atlanta Constitution Newspaper, 1916
>>
>> ------------------------------------------------------------
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>
>
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