Re: [etherlab-dev] Large PDOs

2013-12-12 Thread Jeroen Van den Keybus
> > I’m not sure how the former would help you, since you’re still constrained > by the wire delays of the large data block. > > I could, in the slower thread, upload the SDO in smaller parts (e.g. 64 bytes each) and use linear addressing for that. > > And the second just sounds like “I want non

Re: [etherlab-dev] Large PDOs

2013-12-11 Thread Gavin Lambert
[mailto:jeroen.vandenkey...@gmail.com] Sent: Wednesday, 11 December 2013 22:14 To: Gavin Lambert Cc: etherlab-dev@etherlab.org Subject: Re: [etherlab-dev] Large PDOs Gavin, Thanks for your reply. Currently this slave does not support SDOs since it is a 'resource constrained' FPGA ba

Re: [etherlab-dev] Large PDOs

2013-12-11 Thread Jeroen Van den Keybus
Gavin, Thanks for your reply. Currently this slave does not support SDOs since it is a 'resource constrained' FPGA based design. Both fast and small, and slow and large PDOs are, unfortunately, on the same slave. I would have liked to stay away from using SDOs in the control process. So current

Re: [etherlab-dev] Large PDOs

2013-12-10 Thread Gavin Lambert
How often do you need to access the large value? If it's at a reasonably slow rate (and if you have the freedom to change the slave, or at least unmap the PDO, which it sounds like you do from the below) then you might want to consider accessing it as an SDO instead. If it's an array or record ty