On Sat, May 24, 2008 at 05:24:00PM +0200, Haavard Skinnemoen wrote: > Sergey Lapin <[EMAIL PROTECTED]> wrote: > > But I'm unable to read proper values from lines - they always > > return 0s. Any ideas on fixing? > > Linux i2c-gpio driver works perfectly. > > Please try this patch: > > http://www.nabble.com/-PATCH--soft_i2c%3A-Pull-SDA-high-before-reading-p17270563.html > > You shouldn't need to do anything in the I2C_ACTIVE and I2C_TRISTATE > hooks since the PIO is properly configured in open drain mode.
Alas, I was unable to make bit-banged I2C to work even with this patch applied. As I mentioned above, it works in Linux, but I'd like to be able to set time to my RTC from u-boot. I have checked that pins are configured properly from status registers (pull-ups are enabled, multi-drive mode is enabled (open drain), etc.). I could read only zeroes from SDA line in u-boot, and using oscilloscope, I see data on line. I can't find differencies in setup with i2c-gpio from Linux. Any ideas? Thanks a lot, S. ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ U-Boot-Users mailing list U-Boot-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/u-boot-users
