https://sourceforge.net/p/linux-gpib/support-requests/37/2023-10-27T14:02:24.906000ZRecent changes to 37: GPIO on device mode support2023-10-27T14:02:24.906000Z2023-10-27T14:02:24.906000ZDavePhttps://sourceforge.net/u/dpenkler/https://sourceforge.net332c0e8d76d89cdfef456b9faa10db0bfaff71d7

<div class="markdown_content"><p>Hi, <br/> We abandoned trying to implement device mode support since it was not possible to guarantee that the driver could respond within 200ns to ATN being asserted by the controller in charge. <br/> An additional hardware facility would be required that when DC is high on the SN75162 and ATN on the bus goes low then NDAC is asserted automatically on the bus by a hardware driver. <br/> Then, when eventually the gpio line for NDAC is asserted the hardware driver for NDAC is turned off.<br/> A similar issue exists with the timing requirement for responses to parallel poll. Not having parallel poll support in device mode is however not a show stopper.<br/> /d</p></div>

2023-10-26T10:07:25.419000Z2023-10-26T10:07:25.419000ZJason Hwanghttps://sourceforge.net/u/jasonyhwang/https://sourceforge.netb8e46fd8cd6979befa0fda7ea5fe3ce72bca5dac

<div class="markdown_content"><p>Hi,<br/> I'm trying to make this gpib_bitbang work on device mode, and trying to use a SN75162 instead of SN75161 so I think the hardware limitation of hardware support should be able to overcome. I would like to get some hint on what is needed to make that possible. And I saw on the changelog, there was a time and versions of gpib_bitbang.c supported device mode. Can you point me to that version and maybe some hint to what needed for device mode? I would like to try to make it work and happy to share and contribute on all efforts.</p> <div class="codehilite"><pre><span></span><code>Thanks! </code></pre></div> <p>Best regards,<br/> Jason</p></div>