-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Somebody in the thread at some point said: | Joerg Reisenweber wrote: |> I don't think this direct CPU GPIO thing would be a better alternative |> to an emergency driver directly accessing I2C to force some few bytes |> into the LED controller. | | A device can block the I2C bus indefinitely under some circumstances, | e.g., if you're unlucky enough to crash while in the middle of an I2C | transfer, SCL is low, and the device is sending a 0 or an ACK.
The devices we have on GTA02 are simple state machines for I2C action, all of them are rated at 400Hz so they won't have SCK-driving arrangements anyway to enforce slower SCK. So I don't think we need to worry about this kind of scenario. - -Andy -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iEYEARECAAYFAklttOoACgkQOjLpvpq7dMrN9wCcCVNyC6LckblzYOrY+ouJzIn+ bEoAn31N77/V1Mq52UIpBsOpM3DPBODL =gtJj -----END PGP SIGNATURE----- _______________________________________________ hardware mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/hardware
