[Toybox] [PATCH] Add i2ctransfer.

[enh]

On Sat, Jul 8, 2023 at 2:32 AM Rob Landley <rob at landley.net> wrote:

> On 7/6/23 18:23, enh via Toybox wrote:
> > Tested on a Raspberry Pi 400 with a BME680 connected to the relevant
> > pins, and commands like `i2ctransfer 1 w3 at 0x77 0x60 0xb6 0xd0 r1`, which
> > writes 0xb6 to register 0x60 of chip 0x77 on bus 1, and then reads one
> > byte.
>
> I broke down and did a cleanup pass (f90b2994a2da) which compiles but I
> can't
> test it. Did I break anything obvious?
>

the basics still seem to work for me.


> I still need an i2c test environment. QEMU says it can emulate pi2b and
> pi3b
> (although whether this includes i2c I dunno), but according to
>
> https://raspberrypi.stackexchange.com/questions/127537/can-i-use-the-mainline-kernel-in-my-rasp-if-not-why
> the relevant defconfigs are bcm2709_defconfig and either bcmrpi3_defconfig
> or
> bcm2711_defconfig but all the vanilla 6.4 kernel has is bcm2835_defconfig.
>
> Flashbacks to the last time I tried to make this work: none of it's in
> vanilla,
> and even if you try to use qemu -kernel to bypass the weird bootloader and
> init
> stuff, it's still off in a fork. :(
>
> Hmmm, maybe https://gist.github.com/jonte/b4bd83a5f2e8330418b1f3322bff74f2
> is
> useful in a mkroot testing context...
>
> Rob
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