Zeegee: There is nothing at the hardware level that is uniquely required by the "Process Call" transaction.
You might have to hack into the low level I2C driver to implement it. It looks like a simple 2 byte write followed by a restart and a two byte read in a single transaction. Most I2C chips would properly respond to a 2 byte write transaction, followed by a two byte read transaction, which could be implemented, if you can stand the extra overhead of two shorter transactions. I would recommend migrating off of Angstrom, if you can, since I don't think it is supported any longer on the BBB. --- Graham == On Wednesday, April 4, 2018 at 2:05:03 AM UTC-5, ZG wrote: > > Hi All, > > I am using a beaglebone black and a custom board based off it. > > On the BBB, I am running Debian Linux 7 (Linux 3.8-13) > > On the custom board, I am running Angstrom distribution. > > > On both boards, when I run *i2cdetect -F 2*, they give the same results, > as below: > > Functionalities implemented by /dev/i2c-2: > > I2C yes > > SMBus Quick Command no > > SMBus Send Byte yes > > SMBus Receive Byte yes > > SMBus Write Byte yes > > SMBus Read Byte yes > > SMBus Write Word yes > > SMBus Read Word yes > > SMBus Process Call yes > > SMBus Block Write yes > > SMBus Block Read no > > SMBus Block Process Call no > > SMBus PEC yes > > I2C Block Write yes > > I2C Block Read yes > > > > I REALLY need to use the PROCESS_CALL functionality of the I2C. > > > The question is: does the PROCESS_CALL functionality rely on the hardware? > > if it is just software, any patches or drivers I could use so I could > support it on my hardware? > > I have searched the web with regard to this, but have not found any > answers. > > I am hoping this community would be able to help. > > > Thanks in advance, > > Zeegee > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/5ed9a80d-3596-4678-9eaf-ae48545933e9%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
