[etherlab-users] Problems with Pdo entry with index 0x0000

[Jordi Blanch]

Hello,

we thought that it was necessary to add GAPs entries to the list,
otherwise the master couldn't calculate the bit offset of the data
received from ethercat frames because every ec_pdo_entry_reg_t relates
it's data position to the previous ec_pdo_entry_reg_t item, isn't it?
Also, I think I remember we already tried not to register GAPs and then
we were not receiving the data correctly (but I'm talking from my
memory...).

Thank you.

On Tue, 5 Nov 2013 17:48:03 +0100, Florian Pose <fp at igh.de> wrote:
> Hello,
> 
> On Tue, Nov 05, 2013 at 04:36:26PM +0100, Richard Hacker wrote:
>> I understand your problem when registering gaps. Actually the code
>> in the ethercat master does not do the right thing by testing on
>> index. Actually it should be testing for reg->bit_position instead.
>> I will communicate this with the developer.
> 
> sorry Richard. I have to be contradictory. ;-)
> 
> Please let me clarify this: There should be no gaps in the list passed
> to ecrt_domain_reg_pdo_entry(), because gaps are no actual PDO entries
> and can not be uniquely identified via PDO entry index and
> subindex, and thus can not be registered.
> 
> Note that gaps are perfectly valid in context of the PDO configuration
> (see ecrt_slave_config_pdos() and friends).
> 
> Best regards,
> Florian
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> etherlab-users at etherlab.org
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-- 
Jordi Blanch Carles
Unidad de Ensayo y Control

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