-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Somebody in the thread at some point said: | Andy Green wrote: |> -----BEGIN PGP SIGNED MESSAGE----- |> Hash: SHA1 |> |> Somebody in the thread at some point said: |> |> |> Really USB host is very "usable" and flexible for these tasks. |> |> | It mandates a microcontroller, USB and programming, |> |> So what? | | For some things - switches and buttons - it's a complication beyond just | jamming an I2C peripheral on there.
Is that even true? You still need a button <-> I2C device. Then you might as well have a USB <-> button device and so not need to open the case -- and get power coming cleanly. And your button / whatever works on a laptop or desktop PC. |> | and can't do wakeup well. |> |> Citation needed. | | To clarify - as I understand it the likely power draw required for the | SC* to be awake enough to do USB suspend negotiations is rather high. | Plus it'd require a 5V source alive all the time. What's an SC*? If all your device is doing is a button, you can take it down during suspend and re-enumerate it on resume. Otherwise USB specifies clearly about max suspend current, 500uA. | 20 way 0.5mm FPC connectors are available off-the-shelf inexpensively. | This would make it useful for expansion, in addition to its primary | purpose, in a way that the existing one is not. It's wrongheaded. Use a standard interface that already exists. This week I tore my debug flat cable, they are evil compared to standard and robust USB connector. I will definitely be agitating that we forget about any kind of nonstandard internal connector. - -Andy -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iEYEARECAAYFAkilrEoACgkQOjLpvpq7dMrIKACeLTq7sjAHTIlWgA7o55IyDtg7 hSIAn1gOsyKMM+Q7Efx68R451gn3HjLp =Mxij -----END PGP SIGNATURE----- _______________________________________________ hardware mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/hardware
