Re: I2C/IIC working on RPI4 8GB? [gpio2 and 3 input vs. alt0 control via sysctl use is avilable]
Mark Millard via freebsd-arm <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.arm |
|---|---|
| Message-ID | <[email protected]> |
On 2021-May-1, at 20:14, Mark Millard <marklmi at yahoo.com> wrote: > > > On 2021-May-1, at 19:58, Mark Millard <marklmi at yahoo.com> wrote: > > On 2021-May-1, at 08:31, Mark Millard <marklmi at yahoo.com> wrote: > >> On 2021-May-1, at 04:48, Mark Murray <markm at freebsd.org> wrote: >> >>> On 30 Apr 2021, at 15:22, Klaus Küchemann <maciphone2 at googlemail.com> wrote: >>>> >>>> >>>> yet another useful document(at least that's what I hope to fix your usecase) : >>>> >>>> https://www.raspberrypi.org/documentation/configuration/config-txt/gpio.md >>> >>> BINGO!! >>> >>> I added >>> >>> gpio=2,3=a0 >>> >>> to my config.txt file and after a reboot, >>> >>> # i2c -f /dev/iic0 -s worked! >> >> >> Cool. >> >> But it leaves me wondering what the FreeBSD equivalent >> for setting the mode of those 2 gpio's to a0 (or other >> alternatives) is supposed to look like (even if such >> code would not work as things are in the implementation). >> >> (But, for me, it is idle wondering.) > > [I was given a code hint that I've not investigated yet.] > . . . Going more in a code exploration direction I found evidence of sysctl for: # sysctl dev.gpio.0.pin.3.function dev.gpio.0.pin.2.function dev.gpio.0.pin.3.function: input dev.gpio.0.pin.2.function: input and for: # sysctl dev.gpio.0.pin.3.function=alt0 dev.gpio.0.pin.2.function=alt0 dev.gpio.0.pin.3.function: input -> alt0 dev.gpio.0.pin.2.function: input -> alt0 # sysctl dev.gpio.0.pin.3.function dev.gpio.0.pin.2.function dev.gpio.0.pin.3.function: alt0 dev.gpio.0.pin.2.function: alt0 # gpioctl -f /dev/gpioc0 -l -v pin 00: 1 pin 0<IN>, caps:<IN,OUT,PU,PD,INTRLL,INTRLH,INTRER,INTREF,INTREB> pin 01: 1 pin 1<IN>, caps:<IN,OUT,PU,PD,INTRLL,INTRLH,INTRER,INTREF,INTREB> pin 02: 1 pin 2<>, caps:<IN,OUT,PU,PD,INTRLL,INTRLH,INTRER,INTREF,INTREB> pin 03: 1 pin 3<>, caps:<IN,OUT,PU,PD,INTRLL,INTRLH,INTRER,INTREF,INTREB> pin 04: 1 pin 4<IN>, caps:<IN,OUT,PU,PD,INTRLL,INTRLH,INTRER,INTREF,INTREB> pin 05: 1 pin 5<IN>, caps:<IN,OUT,PU,PD,INTRLL,INTRLH,INTRER,INTREF,INTREB> . . . So it appears that there is no need of the config.txt way of doing it and there is both command-line and code-internal ways of controlling the assignments (via the internal way of initiating sysctl activity). === Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar) _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-arm To unsubscribe, send any mail to "[email protected]"