When I read to the end of the hm2_rpspi man page, I saw that it recommended using spi0 and spi1, so I changed my design for that. I'll report back in a few weeks after I've tried it.
-- Ralph On Jun 10, 2021 1:41 PM, "Peter C. Wallace" <p...@mesanet.com> wrote: CAUTION: This email originated from outside the Walla Walla University email system. On Thu, 10 Jun 2021, Ralph Stirling wrote: > Date: Thu, 10 Jun 2021 19:22:20 +0000 > From: Ralph Stirling <ralph.stirl...@wallawalla.edu> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] Multiple 7i90 cards on Rpi 4b > > I'm not too worried about signal integrity issues, as > I am using a four layer board and the traces are similar > length for the original 2x13 connector and the second > one. I'm more worried about whether the Rpi 4B can > handle double the traffic, and not sure whether it is > better to use SPI0/CE0 and CE1, or SPI0 and SPI1/CE0. > Also whether the multiple board functionality of hm2_rpspi > has even been tested. > > I guess the board won't cost much from JLC, if I combine > the order with another board I need. > > -- Ralph You are very likely the first person to try this... the SPI0+CE0 and CE1 seems simpler but I dont know what hm2_rpspi has implemented. > ________________________________________ > From: Peter C. Wallace [p...@mesanet.com] > Sent: Thursday, June 10, 2021 11:56 AM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Multiple 7i90 cards on Rpi 4b > > On Thu, 10 Jun 2021, Ralph Stirling wrote: > >> Date: Thu, 10 Jun 2021 14:58:24 +0000 >> From: Ralph Stirling <ralph.stirl...@wallawalla.edu> >> Reply-To: "Enhanced Machine Controller (EMC)" >> <emc-users@lists.sourceforge.net> >> To: "emc-users@lists.sourceforge.net" <emc-users@lists.sourceforge.net> >> Subject: [Emc-users] Multiple 7i90 cards on Rpi 4b >> >> The man page for hm2_rpspi indicates that multiple SPI >> cards may be connected to a single pi4, using the spi_probe >> parameter to which SPI port and chip enable line should >> be used for each card. Has this been found to work well? >> I have an application that needs two 7i90hd's, and I will >> be making a small pcb to connect the 7i90hd's and the 4b. >> My single 7i90/4b card is working fine. >> >> Thanks, >> -- Ralph >> > > I have not tried it. Cabling and signal integrity might be an issue. > > Peter Wallace > Mesa Electronics > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7Cb91c54d533a340c9363808d92c5018b3%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C1%7C637589544798551823%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=gzAMyUtNINSbmIMrIUhvtS2tRWEIO%2Fe8MJNyke%2B6NjE%3D&reserved=0 > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7Cb91c54d533a340c9363808d92c5018b3%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C1%7C637589544798551823%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=gzAMyUtNINSbmIMrIUhvtS2tRWEIO%2Fe8MJNyke%2B6NjE%3D&reserved=0 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
