UART: 1500 microsecond delay between receiving and transmitting. Why?

[tschak909]

I am dealing with some time sensitive code where I need to respond to a status message from a 1 wire serial bus.

What can account for a 1500 microsecond delay between receiving data on the UART and transmitting a response to the same UART?

-Thom

[mikemoy]

So your getting 1.5ms delay. How much faster were you expecting ?

[tschak909]

I need to be able to respond to a status request within 200 microsecconds.

-Thom

[ESP_Sprite]

The UART normally tries to collect as many bytes as possible to hand over to the software in one single interrupt; as such it has a timeout time in which it waits to see if there's any more data coming in before firing off an interrupt. You may want to modify rx_timeout_tresh to change this.