Hello Nils: * Nils Faerber <nils.faerber at kernelconcepts.de> [2004-09-10 13:31:55 +0200]: > Oh, and while we are at it ;) > The PIC I have hanging to the SMBus not only has a display connectoed to > it but also some push buttons, i.e. user input. > It is not perfectly clear to me how I should best query those buttons. > Is it possible for the SMBus to generate interrupts on button presse or > do I have to poll those? If you want your SMBus slave to generate an interrupt, you'll need to have a third wire which is an optional part of the spec: #SMBALERT. You can read about it on page 55: http://www.smbus.org/specs/smbus20.pdf Unfortunately, the lm_sensors project I2C stack doesn't have support for this. But you could add it... :) > At least at first glance it seems that the SIS96x does not use > interrupts at all... This is a separate issue. The SIS96x bus driver does not use interrupts to drive the bus, even though it could. Whether or not it could support the optional #SMBALERT mechanism - I don't know, because I don't have a datasheet for it (only a similar one). Regards, -- Mark M. Hoffman mhoffman at lightlink.com
