[U-Boot-Users] [AT91] Problems configuring bit-banged I2C

[Haavard Skinnemoen]

Sergey Lapin <slapin at fan.ossfans.org> 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.

Haavard