I did some "serial connection approach" test, the speed could reach ~4ms. if not faster enough then go through SPI. if still too slower then go through ar9331 MAC/PHY but MCU need updated/replaced.
I did some "serial connection approach" test, the speed could reach ~4ms. if not faster enough then go through SPI. if still too slower then go through ar9331 MAC/PHY but MCU need updated/replaced.