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

[Xuebing Wang]

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?

Thanks.
Xuebing Wang
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