[OpenWrt-Devel] Is "using gpio to simulate I2C bus" robust on AR9331?

Matthew McClintock msm-oss at mcclintock.net
Thu May 4 12:06:29 EDT 2017

On Wed, May 3, 2017 at 8:19 PM, Xuebing Wang <xbing6 at gmail.com> wrote:
> Hi community,
> I am using Atheros AR9331 + OpenWRT Chaos Calmer 15.05 on a commercial
> product.
> I've used I2C on many projects, all with dedicated I2C controllers. I've
> never used GPIOs to simulate I2C on Linux.
> I may be wrong, I am tending to think that there is no way to generate good
> I2C waveforms by using 2 GPIOs (SCL/SDA), except that we disable all
> interrupts and maybe using high precision timer when outputing SCL/SDA?
> Is "using gpio to simulate I2C bus" robust on AR9331?

What speeds are you trying to achieve? There is already a driver in
tree for bitbanged gpio.

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