I spent a few hours this weekend trying to connect some Dallas Semiconductor temperature sensor chips to the GPIO pins on the 5501. The first problem was figuring out the pinout of the GPIO connector (which does NOT match the documentation in the 4801 manual). Once that was solved, the next problem arises: OpenBSD 4.1 does not seem able to identify the chips. The gpioow and onewire devices seem to work, but then I get an error message from the onewire or owtemp driver: family 0x00 serial ... not configured. in this particular case, the chip is a DS1822; I need to test other chips I have sitting around (1820, 18B20). I know the chips themselves are good, as I can read them using a DS9490 adapter using a USB connection under Windows (yuck).
Has anyone had any luck connecting Dallas sensors directly to GPIO pins on a Soekris, using any of the *BSDs, or some other OS? I suspect that there may be combination of factors at play: The pullup/pulldown current of the GPIO pins might be insufficient to drive the Dallas chips in 1-wire mode (using parasitic supply), and the OpenBSD driver might not be up to snuff in bit-banging. By the way, I've also tried using the DS9490 USB-to-one-wire adapter on OpenBSD 4.1, no luck with that either, but I haven't had time to debug it. -- Ralph Becker-Szendy [EMAIL PROTECTED] (408)395-1435 735 Sunset Ridge Road; Los Gatos, CA 95033 _______________________________________________ Soekris-tech mailing list Soekris-tech@lists.soekris.com http://lists.soekris.com/mailman/listinfo/soekris-tech
