I2C uses clock stretching but I'm not aware of any SPI interfaces that do it. However, it may be that the hardware is shared.
On Sun, Feb 24, 2019 at 5:22 PM 'Bruce Snyder' via BeagleBoard < beagleboard@googlegroups.com> wrote: > It's probably for clock-stretching. Both pins clock and data need to go > both ways. > > On Thursday, February 21, 2019 at 9:58:12 AM UTC-5, waplu...@gmail.com > wrote: >> >> Thanks - you saved my day! I just ran into the same quirk. Truly >> bizzare that the SPI_CLK pinmux has to be set as an input in master mode >> where the pin is clearly an output. >> >> On Tuesday, May 7, 2013 at 10:21:11 AM UTC-6, ky...@cranehome.info wrote: >>> >>> Ok at least I'm not that stupid then. ;) >>> >>> On Tuesday, May 7, 2013 10:51:59 AM UTC-5, wb666...@gmail.com wrote: >>>> >>>> Its a quirk of the SPI hardware as far as I can tell, even on the >>>> original Beagleboard the SPI_CLK pinmux has to be set as an input. >>>> >>> -- > 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/6138aa63-d406-4679-a0ab-8bf32189a8d2%40googlegroups.com > <https://groups.google.com/d/msgid/beagleboard/6138aa63-d406-4679-a0ab-8bf32189a8d2%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- 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/CALiMYrv8pfo4odn8WEJCyQLs9g6ZPZZj8y-J0aJ28fQyaGbOmw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
